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kubelet

It does not manage containers that were not created by Kubernetes.
It is an agent that runs on each node in the cluster. It is responsible for registering the node with the kube-apiserver. It will create the pod on the node when it receives the instructions from the kube-apiserver, and monitor the node and container/pod state to ensure that the desired state of the cluster is maintained. By default, kubelet is not automatically deployed on worker nodes, as deploy kubelet as a pod is not recommended. Instead, kubelet is typically installed and managed as a system service on each worker node. This will ensure that the kubelet can always manage the lifecycle of the pods and containers on the node without any dependencies on the Kubernetes control plane components.
For kubelet installation, do refer kubelet installationAlso, if you want to see the kubelet running process, you can use the following command:
View kubelet process
# Check the kubelet process running on the node
ps -aux | grep kubelet

# Check the kubelet config options
cat /var/lib/kubelet/config.yaml

# This file contains the kubelet's configuration, 
# - connection details to the kube-apiserver
# - authentication credentials
# - other settings that govern how the kubelet operates on the node
cat /etc/kubernetes/kubelet.conf

# Check the kubelet service
systemctl status kubelet

kube-proxy

It is a network proxy that runs on each node in the cluster. It is reponsible for creating/maintaining appropriate routing/network rules on nodes when a new service is created to establish communication between containers via services within the cluster. It also handles network traffic and load balancing for the services running on the worker node. Basically, these network rules allow the pods to communicate with each other and with services in the cluster, regardless of where they are running. The kube-proxy can operate in different modes, such as iptables or IPVS, to manage the network traffic and ensure that it is properly routed to the correct pods.

How does kube-proxy work with services?

Every pod can reach other pods within a Kubernetes cluster by deploying a pod networking solution. A pod network is an internal virtual network connecting all nodes in a cluster so that the pods can communicate with each other. In this example, assuming Pod 1 is an API application and Pod 2 is the database. Pod 1 can access Pod 2 using the Pod 2 IP address, but the Pod 2 IP will not be guaranteed the same as always. Therefore, we have to create a Kubernetes service object that exposes the database across the cluster, which means Pod 1 (API application) can access Pod 2 (database) by using the service name and the service will also assign an IP address.
The service gets its IP address from the cluster IP range that is defined in the Kubernetes cluster configuration. When a new service is created, Kubernetes will automatically assign it an IP address from this range.
No, the service does not join the same pod network. The service is a virtual component that only exists in memory and does not have a physical presence in the cluster. It is not a real object with interfaces or active listening processes.
The service is accessible from any node in the cluster because of the kube-proxy. Each node in the Kubernetes cluster runs kube-proxy, which looks for new services and creates appropriate routing rules on the worker nodes to forward traffic to the new services to pods whenever a new service is created. It will ensure that the containers can talk to each other via services within the cluster.This can be done through IPTables rules. It will create an IPTable rules on each node in the cluster to know that the Database service is actually point to Pod 2 (database), 10.106.0.3 ---> 10.106.0.2. This is how kube-proxy configures a new service.
For kube-proxy installation, do refer kube-proxy installationDo take note that, kube-proxy is actually deployed as a DaemonSet in Kubernetes, which means that there will be one kube-proxy pod running on each node in the cluster. This is because kube-proxy needs to manage the network rules on each node to ensure that the services are properly routed to the correct pods. Also, if you want to see the kube-proxy running process, you can use the following command:
View kube-proxy process
# Check the kube-proxy pod
kubectl get pods -n kube-system
kubectl get daemonset -n kube-system

# Check the kube-proxy config options
cat /var/lib/kube-proxy/config.conf
cat /etc/kubernetes/kube-proxy.conf

# Check the kube-proxy process running on the node
ps -aux | grep kube-proxy

Container Runtime

What is Container Runtime Interface (CRI)?The Container Runtime Interface (CRI) is a plugin interface that allows Kubernetes to interact with different container runtimes. It provides a standardized API for Kubernetes to manage the lifecycle of containers, regardless of the underlying container runtime being used. This means that Kubernetes can work with any container runtime that implements the CRI, such as Docker, containerd, CRI-O, etc.
It is responsible for running and managing the lifecycle of containers on the worker node. Kubernetes supports several container runtimes, such as Docker, containerd, and CRI-O. The container runtime is responsible for pulling the container images, starting and stopping the containers, and managing the container lifecycle.
Kubernetes supports other runtime engines that adhere to the OCI standards, like containerd or Rocket, so it is not necessary to install Docker before installing Kubernetes.

Why Kubernetes no need to install Docker?

Kubernetes only needs the Container Runtime Interface (CRI) to work as a container runtime to perform the container operations as long as they adhere to the OCI standards. Therefore, Kubernetes is compatible with any runtime engines via CRI, such as Rocket, containerd, etc. So it is not necessary to install Docker before installing Kubernetes.
ToolAPI UsedPrimary TargetKey Use Case
crictlCRI API (gRPC)Kubelet / KubernetesDebugging Kubernetes pods and containers.
nerdctlcontainerd API via its socket (/var/run/containerd/containerd.sock)containerd daemonDocker-compatible CLI for modern containerd management.
ctrcontainerd API via its socket (/var/run/containerd/containerd.sock)containerd daemonLow-level debugging of containerd internals; minimal UX.

containerD & ctr

containerD is a container runtime that is designed to be lightweight, efficient, and compliant with the standards. It is a popular choice for Kubernetes clusters because of its performance and simplicity. When you install containerD, it will automatically install its command-line tool called “ctr”. This tool is mainly used for debugging containerD and is not user-friendly, but it provides a great way to understand how containers work under the hood. Here is an example of how to use the ctr command-line tool to pull an image and run a container:
Pulling an image with ctr
kcserver@kcserver:~$ ctr images pull docker.io/library/redis:alpine 
docker.io/library/redis:alpine                  fetching image content
docker.io/library/redis:alpine                  fetching image content
└──index (81b6f81d6a6c)                         complete        |++++++++++++++++++++++++++++++++++++++|
docker.io/library/redis:alpine                  fetching image content
└──index (81b6f81d6a6c)                         complete        |++++++++++++++++++++++++++++++++++++++|
   ├──manifest (c652b6ed7bee)                   complete        |++++++++++++++++++++++++++++++++++++++|
docker.io/library/redis:alpine                  fetching image content
└──index (81b6f81d6a6c)                         complete        |++++++++++++++++++++++++++++++++++++++|
   ├──manifest (c652b6ed7bee)                   complete        |++++++++++++++++++++++++++++++++++++++|
docker.io/library/redis:alpine                  fetching image content
└──index (81b6f81d6a6c)                         complete        |++++++++++++++++++++++++++++++++++++++|
   ├──manifest (c652b6ed7bee)                   complete        |++++++++++++++++++++++++++++++++++++++|
docker.io/library/redis:alpine                  fetching image content
└──index (81b6f81d6a6c)                         complete        |++++++++++++++++++++++++++++++++++++++|
   ├──manifest (c652b6ed7bee)                   complete        |++++++++++++++++++++++++++++++++++++++|
docker.io/library/redis:alpine                  fetching image content
└──index (81b6f81d6a6c)                         complete        |++++++++++++++++++++++++++++++++++++++|
   ├──manifest (c652b6ed7bee)                   complete        |++++++++++++++++++++++++++++++++++++++|
  └──config (d3882d80f0f6)                  waiting         |--------------------------------------|
docker.io/library/redis:alpine                  fetching image content
└──index (81b6f81d6a6c)                         complete        |++++++++++++++++++++++++++++++++++++++|
   ├──manifest (c652b6ed7bee)                   complete        |++++++++++++++++++++++++++++++++++++++|
  └──config (d3882d80f0f6)                  waiting         |--------------------------------------|
   ├──manifest (97b5fbd994ef)                   complete        |++++++++++++++++++++++++++++++++++++++|
docker.io/library/redis:alpine                  fetching image content
└──index (81b6f81d6a6c)                         complete        |++++++++++++++++++++++++++++++++++++++|
   ├──manifest (c652b6ed7bee)                   complete        |++++++++++++++++++++++++++++++++++++++|
  └──config (d3882d80f0f6)                  waiting         |--------------------------------------|
   ├──manifest (97b5fbd994ef)                   complete        |++++++++++++++++++++++++++++++++++++++|
  └──config (3b528d9f3868)                  waiting         |--------------------------------------|
docker.io/library/redis:alpine                  fetching image content
└──index (81b6f81d6a6c)                         complete        |++++++++++++++++++++++++++++++++++++++|
   ├──manifest (c652b6ed7bee)                   complete        |++++++++++++++++++++++++++++++++++++++|
  └──config (d3882d80f0f6)                  waiting         |--------------------------------------|
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docker.io/library/redis:alpine                  fetching image content
└──index (81b6f81d6a6c)                         complete        |++++++++++++++++++++++++++++++++++++++|
   ├──manifest (c652b6ed7bee)                   complete        |++++++++++++++++++++++++++++++++++++++|
  └──config (d3882d80f0f6)                  waiting         |--------------------------------------|
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docker.io/library/redis:alpine                  fetching image content
└──index (81b6f81d6a6c)                         complete        |++++++++++++++++++++++++++++++++++++++|
   ├──manifest (c652b6ed7bee)                   complete        |++++++++++++++++++++++++++++++++++++++|
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docker.io/library/redis:alpine                  fetching image content
└──index (81b6f81d6a6c)                         complete        |++++++++++++++++++++++++++++++++++++++|
   ├──manifest (c652b6ed7bee)                   complete        |++++++++++++++++++++++++++++++++++++++|
  └──config (d3882d80f0f6)                  waiting         |--------------------------------------|
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   ├──manifest (c560572f2aa9)                   complete        |++++++++++++++++++++++++++++++++++++++|
docker.io/library/redis:alpine                  fetching image content
└──index (81b6f81d6a6c)                         complete        |++++++++++++++++++++++++++++++++++++++|
   ├──manifest (c652b6ed7bee)                   complete        |++++++++++++++++++++++++++++++++++++++|
  └──config (d3882d80f0f6)                  waiting         |--------------------------------------|
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  └──config (4a6c79b4cf2a)                  waiting         |--------------------------------------|
docker.io/library/redis:alpine                  fetching image content
└──index (81b6f81d6a6c)                         complete        |++++++++++++++++++++++++++++++++++++++|
   ├──manifest (c652b6ed7bee)                   complete        |++++++++++++++++++++++++++++++++++++++|
  └──config (d3882d80f0f6)                  waiting         |--------------------------------------|
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   ├──manifest (c560572f2aa9)                   complete        |++++++++++++++++++++++++++++++++++++++|
  └──config (4a6c79b4cf2a)                  waiting         |--------------------------------------|
   ├──manifest (883c7c980a2f)                   waiting         |--------------------------------------|
docker.io/library/redis:alpine                  fetching image content
└──index (81b6f81d6a6c)                         complete        |++++++++++++++++++++++++++++++++++++++|
   ├──manifest (c652b6ed7bee)                   complete        |++++++++++++++++++++++++++++++++++++++|
  └──config (d3882d80f0f6)                  waiting         |--------------------------------------|
   ├──manifest (97b5fbd994ef)                   complete        |++++++++++++++++++++++++++++++++++++++|
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   ├──manifest (883c7c980a2f)                   waiting         |--------------------------------------|
docker.io/library/redis:alpine                  fetching image content
└──index (81b6f81d6a6c)                         complete        |++++++++++++++++++++++++++++++++++++++|
   ├──manifest (c652b6ed7bee)                   complete        |++++++++++++++++++++++++++++++++++++++|
  └──config (d3882d80f0f6)                  waiting         |--------------------------------------|
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   ├──manifest (883c7c980a2f)                   waiting         |--------------------------------------|
docker.io/library/redis:alpine                  fetching image content
└──index (81b6f81d6a6c)                         complete        |++++++++++++++++++++++++++++++++++++++|
   ├──manifest (c652b6ed7bee)                   complete        |++++++++++++++++++++++++++++++++++++++|
  └──config (d3882d80f0f6)                  waiting         |--------------------------------------|
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  └──config (4a6c79b4cf2a)                  waiting         |--------------------------------------|
   ├──manifest (883c7c980a2f)                   complete        |++++++++++++++++++++++++++++++++++++++|
docker.io/library/redis:alpine                  fetching image content
└──index (81b6f81d6a6c)                         complete        |++++++++++++++++++++++++++++++++++++++|
   ├──manifest (c652b6ed7bee)                   complete        |++++++++++++++++++++++++++++++++++++++|
  └──config (d3882d80f0f6)                  waiting         |--------------------------------------|
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   ├──manifest (c560572f2aa9)                   complete        |++++++++++++++++++++++++++++++++++++++|
  └──config (4a6c79b4cf2a)                  waiting         |--------------------------------------|
   ├──manifest (883c7c980a2f)                   complete        |++++++++++++++++++++++++++++++++++++++|
docker.io/library/redis:alpine                  fetching image content
└──index (81b6f81d6a6c)                         complete        |++++++++++++++++++++++++++++++++++++++|
   ├──manifest (c652b6ed7bee)                   complete        |++++++++++++++++++++++++++++++++++++++|
  └──config (d3882d80f0f6)                  waiting         |--------------------------------------|
   ├──manifest (97b5fbd994ef)                   complete        |++++++++++++++++++++++++++++++++++++++|
  └──config (3b528d9f3868)                  waiting         |--------------------------------------|
   ├──manifest (c560572f2aa9)                   complete        |++++++++++++++++++++++++++++++++++++++|
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   ├──manifest (883c7c980a2f)                   complete        |++++++++++++++++++++++++++++++++++++++|
  └──config (b95f59534a91)                  waiting         |--------------------------------------|
docker.io/library/redis:alpine                  fetching image content
└──index (81b6f81d6a6c)                         complete        |++++++++++++++++++++++++++++++++++++++|
   ├──manifest (c652b6ed7bee)                   complete        |++++++++++++++++++++++++++++++++++++++|
  └──config (d3882d80f0f6)                  waiting         |--------------------------------------|
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docker.io/library/redis:alpine                  fetching image content
└──index (81b6f81d6a6c)                         complete        |++++++++++++++++++++++++++++++++++++++|
   ├──manifest (c652b6ed7bee)                   complete        |++++++++++++++++++++++++++++++++++++++|
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docker.io/library/redis:alpine                  fetching image content
└──index (81b6f81d6a6c)                         complete        |++++++++++++++++++++++++++++++++++++++|
   ├──manifest (c652b6ed7bee)                   complete        |++++++++++++++++++++++++++++++++++++++|
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docker.io/library/redis:alpine                  fetching image content
└──index (81b6f81d6a6c)                         complete        |++++++++++++++++++++++++++++++++++++++|
   ├──manifest (c652b6ed7bee)                   complete        |++++++++++++++++++++++++++++++++++++++|
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docker.io/library/redis:alpine                  fetching image content
└──index (81b6f81d6a6c)                         complete        |++++++++++++++++++++++++++++++++++++++|
   ├──manifest (c652b6ed7bee)                   complete        |++++++++++++++++++++++++++++++++++++++|
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docker.io/library/redis:alpine                  fetching image content
└──index (81b6f81d6a6c)                         complete        |++++++++++++++++++++++++++++++++++++++|
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docker.io/library/redis:alpine                  fetching image content
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docker.io/library/redis:alpine                  fetching image content
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docker.io/library/redis:alpine                  fetching image content
└──index (81b6f81d6a6c)                         complete        |++++++++++++++++++++++++++++++++++++++|
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docker.io/library/redis:alpine                  fetching image content
└──index (81b6f81d6a6c)                         complete        |++++++++++++++++++++++++++++++++++++++|
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docker.io/library/redis:alpine                  fetching image content
└──index (81b6f81d6a6c)                         complete        |++++++++++++++++++++++++++++++++++++++|
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docker.io/library/redis:alpine                  fetching image content
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docker.io/library/redis:alpine                  fetching image content
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  └──config (d3882d80f0f6)                  complete        |++++++++++++++++++++++++++++++++++++++|
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  └──config (3b528d9f3868)                  complete        |++++++++++++++++++++++++++++++++++++++|
   ├──manifest (c560572f2aa9)                   complete        |++++++++++++++++++++++++++++++++++++++|
  └──config (4a6c79b4cf2a)                  waiting         |--------------------------------------|
   ├──manifest (883c7c980a2f)                   complete        |++++++++++++++++++++++++++++++++++++++|
  └──config (b95f59534a91)                  waiting         |--------------------------------------|
   ├──manifest (a99ef13a9ec0)                   complete        |++++++++++++++++++++++++++++++++++++++|
docker.io/library/redis:alpine                  fetching image content
└──index (81b6f81d6a6c)                         complete        |++++++++++++++++++++++++++++++++++++++|
   ├──manifest (c652b6ed7bee)                   complete        |++++++++++++++++++++++++++++++++++++++|
  └──config (d3882d80f0f6)                  complete        |++++++++++++++++++++++++++++++++++++++|
   ├──manifest (97b5fbd994ef)                   complete        |++++++++++++++++++++++++++++++++++++++|
  └──config (3b528d9f3868)                  complete        |++++++++++++++++++++++++++++++++++++++|
   ├──manifest (c560572f2aa9)                   complete        |++++++++++++++++++++++++++++++++++++++|
  └──config (4a6c79b4cf2a)                  waiting         |--------------------------------------|
   ├──manifest (883c7c980a2f)                   complete        |++++++++++++++++++++++++++++++++++++++|
  ├──config (b95f59534a91)                  waiting         |--------------------------------------|
  └──layer (826f751c7f6d)                   waiting         |--------------------------------------|
   ├──manifest (a99ef13a9ec0)                   complete        |++++++++++++++++++++++++++++++++++++++|
docker.io/library/redis:alpine                  fetching image content
└──index (81b6f81d6a6c)                         complete        |++++++++++++++++++++++++++++++++++++++|
   ├──manifest (c652b6ed7bee)                   complete        |++++++++++++++++++++++++++++++++++++++|
  └──config (d3882d80f0f6)                  complete        |++++++++++++++++++++++++++++++++++++++|
   ├──manifest (97b5fbd994ef)                   complete        |++++++++++++++++++++++++++++++++++++++|
  └──config (3b528d9f3868)                  complete        |++++++++++++++++++++++++++++++++++++++|
   ├──manifest (c560572f2aa9)                   complete        |++++++++++++++++++++++++++++++++++++++|
  └──config (4a6c79b4cf2a)                  waiting         |--------------------------------------|
   ├──manifest (883c7c980a2f)                   complete        |++++++++++++++++++++++++++++++++++++++|
  ├──config (b95f59534a91)                  waiting         |--------------------------------------|
  ├──layer (826f751c7f6d)                   waiting         |--------------------------------------|
  └──layer (d3f91c0b9ad5)                   waiting         |--------------------------------------|
   ├──manifest (a99ef13a9ec0)                   complete        |++++++++++++++++++++++++++++++++++++++|
docker.io/library/redis:alpine                  fetching image content
└──index (81b6f81d6a6c)                         complete        |++++++++++++++++++++++++++++++++++++++|
   ├──manifest (c652b6ed7bee)                   complete        |++++++++++++++++++++++++++++++++++++++|
  └──config (d3882d80f0f6)                  complete        |++++++++++++++++++++++++++++++++++++++|
   ├──manifest (97b5fbd994ef)                   complete        |++++++++++++++++++++++++++++++++++++++|
  └──config (3b528d9f3868)                  complete        |++++++++++++++++++++++++++++++++++++++|
   ├──manifest (c560572f2aa9)                   complete        |++++++++++++++++++++++++++++++++++++++|
  └──config (4a6c79b4cf2a)                  waiting         |--------------------------------------|
   ├──manifest (883c7c980a2f)                   complete        |++++++++++++++++++++++++++++++++++++++|
  ├──config (b95f59534a91)                  waiting         |--------------------------------------|
  ├──layer (826f751c7f6d)                   waiting         |--------------------------------------|
  ├──layer (d3f91c0b9ad5)                   waiting         |--------------------------------------|
  └──layer (589002ba0eae)                   waiting         |--------------------------------------|
   ├──manifest (a99ef13a9ec0)                   complete        |++++++++++++++++++++++++++++++++++++++|
docker.io/library/redis:alpine                  fetching image content
└──index (81b6f81d6a6c)                         complete        |++++++++++++++++++++++++++++++++++++++|
   ├──manifest (c652b6ed7bee)                   complete        |++++++++++++++++++++++++++++++++++++++|
  └──config (d3882d80f0f6)                  complete        |++++++++++++++++++++++++++++++++++++++|
   ├──manifest (97b5fbd994ef)                   complete        |++++++++++++++++++++++++++++++++++++++|
  └──config (3b528d9f3868)                  complete        |++++++++++++++++++++++++++++++++++++++|
   ├──manifest (c560572f2aa9)                   complete        |++++++++++++++++++++++++++++++++++++++|
  └──config (4a6c79b4cf2a)                  waiting         |--------------------------------------|
   ├──manifest (883c7c980a2f)                   complete        |++++++++++++++++++++++++++++++++++++++|
  ├──config (b95f59534a91)                  waiting         |--------------------------------------|
  ├──layer (826f751c7f6d)                   waiting         |--------------------------------------|
  ├──layer (d3f91c0b9ad5)                   waiting         |--------------------------------------|
  ├──layer (589002ba0eae)                   waiting         |--------------------------------------|
  └──layer (cd9ebb746e5b)                   waiting         |--------------------------------------|
   ├──manifest (a99ef13a9ec0)                   complete        |++++++++++++++++++++++++++++++++++++++|
docker.io/library/redis:alpine                  fetching image content
└──index (81b6f81d6a6c)                         complete        |++++++++++++++++++++++++++++++++++++++|
   ├──manifest (c652b6ed7bee)                   complete        |++++++++++++++++++++++++++++++++++++++|
  └──config (d3882d80f0f6)                  complete        |++++++++++++++++++++++++++++++++++++++|
   ├──manifest (97b5fbd994ef)                   complete        |++++++++++++++++++++++++++++++++++++++|
  └──config (3b528d9f3868)                  complete        |++++++++++++++++++++++++++++++++++++++|
   ├──manifest (c560572f2aa9)                   complete        |++++++++++++++++++++++++++++++++++++++|
  └──config (4a6c79b4cf2a)                  waiting         |--------------------------------------|
   ├──manifest (883c7c980a2f)                   complete        |++++++++++++++++++++++++++++++++++++++|
  ├──config (b95f59534a91)                  waiting         |--------------------------------------|
  ├──layer (826f751c7f6d)                   waiting         |--------------------------------------|
  ├──layer (d3f91c0b9ad5)                   waiting         |--------------------------------------|
  ├──layer (589002ba0eae)                   waiting         |--------------------------------------|
  ├──layer (cd9ebb746e5b)                   waiting         |--------------------------------------|
  └──layer (4f4fb700ef54)                   waiting         |--------------------------------------|
   ├──manifest (a99ef13a9ec0)                   complete        |++++++++++++++++++++++++++++++++++++++|
docker.io/library/redis:alpine                  fetching image content
└──index (81b6f81d6a6c)                         complete        |++++++++++++++++++++++++++++++++++++++|
   ├──manifest (c652b6ed7bee)                   complete        |++++++++++++++++++++++++++++++++++++++|
  └──config (d3882d80f0f6)                  complete        |++++++++++++++++++++++++++++++++++++++|
   ├──manifest (97b5fbd994ef)                   complete        |++++++++++++++++++++++++++++++++++++++|
  └──config (3b528d9f3868)                  complete        |++++++++++++++++++++++++++++++++++++++|
   ├──manifest (c560572f2aa9)                   complete        |++++++++++++++++++++++++++++++++++++++|
  └──config (4a6c79b4cf2a)                  waiting         |--------------------------------------|
   ├──manifest (883c7c980a2f)                   complete        |++++++++++++++++++++++++++++++++++++++|
  ├──config (b95f59534a91)                  waiting         |--------------------------------------|
  ├──layer (826f751c7f6d)                   waiting         |--------------------------------------|
  ├──layer (d3f91c0b9ad5)                   waiting         |--------------------------------------|
  ├──layer (589002ba0eae)                   waiting         |--------------------------------------|
  ├──layer (cd9ebb746e5b)                   waiting         |--------------------------------------|
  ├──layer (4f4fb700ef54)                   waiting         |--------------------------------------|
  └──layer (cb2f87994157)                   waiting         |--------------------------------------|
   ├──manifest (a99ef13a9ec0)                   complete        |++++++++++++++++++++++++++++++++++++++|
docker.io/library/redis:alpine                  fetching image content
└──index (81b6f81d6a6c)                         complete        |++++++++++++++++++++++++++++++++++++++|
   ├──manifest (c652b6ed7bee)                   complete        |++++++++++++++++++++++++++++++++++++++|
  └──config (d3882d80f0f6)                  complete        |++++++++++++++++++++++++++++++++++++++|
   ├──manifest (97b5fbd994ef)                   complete        |++++++++++++++++++++++++++++++++++++++|
  └──config (3b528d9f3868)                  complete        |++++++++++++++++++++++++++++++++++++++|
   ├──manifest (c560572f2aa9)                   complete        |++++++++++++++++++++++++++++++++++++++|
  └──config (4a6c79b4cf2a)                  waiting         |--------------------------------------|
   ├──manifest (883c7c980a2f)                   complete        |++++++++++++++++++++++++++++++++++++++|
  ├──config (b95f59534a91)                  waiting         |--------------------------------------|
  ├──layer (826f751c7f6d)                   waiting         |--------------------------------------|
  ├──layer (d3f91c0b9ad5)                   waiting         |--------------------------------------|
  ├──layer (589002ba0eae)                   waiting         |--------------------------------------|
  ├──layer (cd9ebb746e5b)                   waiting         |--------------------------------------|
  ├──layer (4f4fb700ef54)                   waiting         |--------------------------------------|
  ├──layer (cb2f87994157)                   waiting         |--------------------------------------|
  └──layer (d67eeb8f9f36)                   waiting         |--------------------------------------|
   ├──manifest (a99ef13a9ec0)                   complete        |++++++++++++++++++++++++++++++++++++++|
docker.io/library/redis:alpine                  fetching image content
└──index (81b6f81d6a6c)                         complete        |++++++++++++++++++++++++++++++++++++++|
   ├──manifest (c652b6ed7bee)                   complete        |++++++++++++++++++++++++++++++++++++++|
  └──config (d3882d80f0f6)                  complete        |++++++++++++++++++++++++++++++++++++++|
   ├──manifest (97b5fbd994ef)                   complete        |++++++++++++++++++++++++++++++++++++++|
  └──config (3b528d9f3868)                  complete        |++++++++++++++++++++++++++++++++++++++|
   ├──manifest (c560572f2aa9)                   complete        |++++++++++++++++++++++++++++++++++++++|
  └──config (4a6c79b4cf2a)                  waiting         |--------------------------------------|
   ├──manifest (883c7c980a2f)                   complete        |++++++++++++++++++++++++++++++++++++++|
  ├──config (b95f59534a91)                  complete        |++++++++++++++++++++++++++++++++++++++|
  ├──layer (826f751c7f6d)                   waiting         |--------------------------------------|
  ├──layer (d3f91c0b9ad5)                   waiting         |--------------------------------------|
  ├──layer (589002ba0eae)                   waiting         |--------------------------------------|
  ├──layer (cd9ebb746e5b)                   waiting         |--------------------------------------|
  ├──layer (4f4fb700ef54)                   waiting         |--------------------------------------|
  ├──layer (cb2f87994157)                   waiting         |--------------------------------------|
  └──layer (d67eeb8f9f36)                   waiting         |--------------------------------------|
   ├──manifest (a99ef13a9ec0)                   complete        |++++++++++++++++++++++++++++++++++++++|
docker.io/library/redis:alpine                  fetching image content
└──index (81b6f81d6a6c)                         complete        |++++++++++++++++++++++++++++++++++++++|
   ├──manifest (c652b6ed7bee)                   complete        |++++++++++++++++++++++++++++++++++++++|
  └──config (d3882d80f0f6)                  complete        |++++++++++++++++++++++++++++++++++++++|
   ├──manifest (97b5fbd994ef)                   complete        |++++++++++++++++++++++++++++++++++++++|
  └──config (3b528d9f3868)                  complete        |++++++++++++++++++++++++++++++++++++++|
   ├──manifest (c560572f2aa9)                   complete        |++++++++++++++++++++++++++++++++++++++|
  └──config (4a6c79b4cf2a)                  complete        |++++++++++++++++++++++++++++++++++++++|
   ├──manifest (883c7c980a2f)                   complete        |++++++++++++++++++++++++++++++++++++++|
  ├──config (b95f59534a91)                  complete        |++++++++++++++++++++++++++++++++++++++|
  ├──layer (826f751c7f6d)                   waiting         |--------------------------------------|
  ├──layer (d3f91c0b9ad5)                   waiting         |--------------------------------------|
  ├──layer (589002ba0eae)                   waiting         |--------------------------------------|
  ├──layer (cd9ebb746e5b)                   waiting         |--------------------------------------|
  ├──layer (4f4fb700ef54)                   waiting         |--------------------------------------|
  ├──layer (cb2f87994157)                   waiting         |--------------------------------------|
  └──layer (d67eeb8f9f36)                   waiting         |--------------------------------------|
   ├──manifest (a99ef13a9ec0)                   complete        |++++++++++++++++++++++++++++++++++++++|
docker.io/library/redis:alpine                  fetching image content
└──index (81b6f81d6a6c)                         complete        |++++++++++++++++++++++++++++++++++++++|
   ├──manifest (c652b6ed7bee)                   complete        |++++++++++++++++++++++++++++++++++++++|
  └──config (d3882d80f0f6)                  complete        |++++++++++++++++++++++++++++++++++++++|
   ├──manifest (97b5fbd994ef)                   complete        |++++++++++++++++++++++++++++++++++++++|
  └──config (3b528d9f3868)                  complete        |++++++++++++++++++++++++++++++++++++++|
   ├──manifest (c560572f2aa9)                   complete        |++++++++++++++++++++++++++++++++++++++|
  └──config (4a6c79b4cf2a)                  complete        |++++++++++++++++++++++++++++++++++++++|
   ├──manifest (883c7c980a2f)                   complete        |++++++++++++++++++++++++++++++++++++++|
  ├──config (b95f59534a91)                  complete        |++++++++++++++++++++++++++++++++++++++|
  ├──layer (826f751c7f6d)                   waiting         |--------------------------------------|
  ├──layer (d3f91c0b9ad5)                   waiting         |--------------------------------------|
  ├──layer (589002ba0eae)                   waiting         |--------------------------------------|
  ├──layer (cd9ebb746e5b)                   waiting         |--------------------------------------|
  ├──layer (4f4fb700ef54)                   waiting         |--------------------------------------|
  ├──layer (cb2f87994157)                   waiting         |--------------------------------------|
  └──layer (d67eeb8f9f36)                   waiting         |--------------------------------------|
   ├──manifest (a99ef13a9ec0)                   complete        |++++++++++++++++++++++++++++++++++++++|
docker.io/library/redis:alpine                  fetching image content
└──index (81b6f81d6a6c)                         complete        |++++++++++++++++++++++++++++++++++++++|
   ├──manifest (c652b6ed7bee)                   complete        |++++++++++++++++++++++++++++++++++++++|
  └──config (d3882d80f0f6)                  complete        |++++++++++++++++++++++++++++++++++++++|
   ├──manifest (97b5fbd994ef)                   complete        |++++++++++++++++++++++++++++++++++++++|
  └──config (3b528d9f3868)                  complete        |++++++++++++++++++++++++++++++++++++++|
   ├──manifest (c560572f2aa9)                   complete        |++++++++++++++++++++++++++++++++++++++|
  └──config (4a6c79b4cf2a)                  complete        |++++++++++++++++++++++++++++++++++++++|
   ├──manifest (883c7c980a2f)                   complete        |++++++++++++++++++++++++++++++++++++++|
  ├──config (b95f59534a91)                  complete        |++++++++++++++++++++++++++++++++++++++|
  ├──layer (826f751c7f6d)                   waiting         |--------------------------------------|
  ├──layer (d3f91c0b9ad5)                   waiting         |--------------------------------------|
  ├──layer (589002ba0eae)                   waiting         |--------------------------------------|
  ├──layer (cd9ebb746e5b)                   waiting         |--------------------------------------|
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  ├──layer (cb2f87994157)                   waiting         |--------------------------------------|
  └──layer (d67eeb8f9f36)                   waiting         |--------------------------------------|
   ├──manifest (a99ef13a9ec0)                   complete        |++++++++++++++++++++++++++++++++++++++|
docker.io/library/redis:alpine                  fetching image content
└──index (81b6f81d6a6c)                         complete        |++++++++++++++++++++++++++++++++++++++|
   ├──manifest (c652b6ed7bee)                   complete        |++++++++++++++++++++++++++++++++++++++|
  └──config (d3882d80f0f6)                  complete        |++++++++++++++++++++++++++++++++++++++|
   ├──manifest (97b5fbd994ef)                   complete        |++++++++++++++++++++++++++++++++++++++|
  └──config (3b528d9f3868)                  complete        |++++++++++++++++++++++++++++++++++++++|
   ├──manifest (c560572f2aa9)                   complete        |++++++++++++++++++++++++++++++++++++++|
  └──config (4a6c79b4cf2a)                  complete        |++++++++++++++++++++++++++++++++++++++|
   ├──manifest (883c7c980a2f)                   complete        |++++++++++++++++++++++++++++++++++++++|
  ├──config (b95f59534a91)                  complete        |++++++++++++++++++++++++++++++++++++++|
  ├──layer (826f751c7f6d)                   waiting         |--------------------------------------|
  ├──layer (d3f91c0b9ad5)                   waiting         |--------------------------------------|
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  ├──layer (cb2f87994157)                   waiting         |--------------------------------------|
  └──layer (d67eeb8f9f36)                   waiting         |--------------------------------------|
   ├──manifest (a99ef13a9ec0)                   complete        |++++++++++++++++++++++++++++++++++++++|
docker.io/library/redis:alpine                  fetching image content
└──index (81b6f81d6a6c)                         complete        |++++++++++++++++++++++++++++++++++++++|
   ├──manifest (c652b6ed7bee)                   complete        |++++++++++++++++++++++++++++++++++++++|
  └──config (d3882d80f0f6)                  complete        |++++++++++++++++++++++++++++++++++++++|
   ├──manifest (97b5fbd994ef)                   complete        |++++++++++++++++++++++++++++++++++++++|
  └──config (3b528d9f3868)                  complete        |++++++++++++++++++++++++++++++++++++++|
   ├──manifest (c560572f2aa9)                   complete        |++++++++++++++++++++++++++++++++++++++|
  └──config (4a6c79b4cf2a)                  complete        |++++++++++++++++++++++++++++++++++++++|
   ├──manifest (883c7c980a2f)                   complete        |++++++++++++++++++++++++++++++++++++++|
  ├──config (b95f59534a91)                  complete        |++++++++++++++++++++++++++++++++++++++|
  ├──layer (826f751c7f6d)                   waiting         |--------------------------------------|
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  ├──layer (cb2f87994157)                   waiting         |--------------------------------------|
  └──layer (d67eeb8f9f36)                   waiting         |--------------------------------------|
   ├──manifest (a99ef13a9ec0)                   complete        |++++++++++++++++++++++++++++++++++++++|
docker.io/library/redis:alpine                  fetching image content
└──index (81b6f81d6a6c)                         complete        |++++++++++++++++++++++++++++++++++++++|
   ├──manifest (c652b6ed7bee)                   complete        |++++++++++++++++++++++++++++++++++++++|
  └──config (d3882d80f0f6)                  complete        |++++++++++++++++++++++++++++++++++++++|
   ├──manifest (97b5fbd994ef)                   complete        |++++++++++++++++++++++++++++++++++++++|
  └──config (3b528d9f3868)                  complete        |++++++++++++++++++++++++++++++++++++++|
   ├──manifest (c560572f2aa9)                   complete        |++++++++++++++++++++++++++++++++++++++|
  └──config (4a6c79b4cf2a)                  complete        |++++++++++++++++++++++++++++++++++++++|
   ├──manifest (883c7c980a2f)                   complete        |++++++++++++++++++++++++++++++++++++++|
  ├──config (b95f59534a91)                  complete        |++++++++++++++++++++++++++++++++++++++|
  ├──layer (826f751c7f6d)                   complete        |++++++++++++++++++++++++++++++++++++++|
  ├──layer (d3f91c0b9ad5)                   waiting         |--------------------------------------|
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  ├──layer (cb2f87994157)                   waiting         |--------------------------------------|
  └──layer (d67eeb8f9f36)                   waiting         |--------------------------------------|
   ├──manifest (a99ef13a9ec0)                   complete        |++++++++++++++++++++++++++++++++++++++|
docker.io/library/redis:alpine                  fetching image content
└──index (81b6f81d6a6c)                         complete        |++++++++++++++++++++++++++++++++++++++|
   ├──manifest (c652b6ed7bee)                   complete        |++++++++++++++++++++++++++++++++++++++|
  └──config (d3882d80f0f6)                  complete        |++++++++++++++++++++++++++++++++++++++|
   ├──manifest (97b5fbd994ef)                   complete        |++++++++++++++++++++++++++++++++++++++|
  └──config (3b528d9f3868)                  complete        |++++++++++++++++++++++++++++++++++++++|
   ├──manifest (c560572f2aa9)                   complete        |++++++++++++++++++++++++++++++++++++++|
  └──config (4a6c79b4cf2a)                  complete        |++++++++++++++++++++++++++++++++++++++|
   ├──manifest (883c7c980a2f)                   complete        |++++++++++++++++++++++++++++++++++++++|
  ├──config (b95f59534a91)                  complete        |++++++++++++++++++++++++++++++++++++++|
  ├──layer (826f751c7f6d)                   complete        |++++++++++++++++++++++++++++++++++++++|
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  ├──layer (589002ba0eae)                   waiting         |--------------------------------------|
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  ├──layer (cb2f87994157)                   waiting         |--------------------------------------|
  └──layer (d67eeb8f9f36)                   waiting         |--------------------------------------|
   ├──manifest (a99ef13a9ec0)                   complete        |++++++++++++++++++++++++++++++++++++++|
docker.io/library/redis:alpine                  fetching image content
└──index (81b6f81d6a6c)                         complete        |++++++++++++++++++++++++++++++++++++++|
   ├──manifest (c652b6ed7bee)                   complete        |++++++++++++++++++++++++++++++++++++++|
  └──config (d3882d80f0f6)                  complete        |++++++++++++++++++++++++++++++++++++++|
   ├──manifest (97b5fbd994ef)                   complete        |++++++++++++++++++++++++++++++++++++++|
  └──config (3b528d9f3868)                  complete        |++++++++++++++++++++++++++++++++++++++|
   ├──manifest (c560572f2aa9)                   complete        |++++++++++++++++++++++++++++++++++++++|
  └──config (4a6c79b4cf2a)                  complete        |++++++++++++++++++++++++++++++++++++++|
   ├──manifest (883c7c980a2f)                   complete        |++++++++++++++++++++++++++++++++++++++|
  ├──config (b95f59534a91)                  complete        |++++++++++++++++++++++++++++++++++++++|
  ├──layer (826f751c7f6d)                   complete        |++++++++++++++++++++++++++++++++++++++|
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  ├──layer (589002ba0eae)                   waiting         |--------------------------------------|
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  ├──layer (cb2f87994157)                   waiting         |--------------------------------------|
  └──layer (d67eeb8f9f36)                   complete        |++++++++++++++++++++++++++++++++++++++|
   ├──manifest (a99ef13a9ec0)                   complete        |++++++++++++++++++++++++++++++++++++++|
docker.io/library/redis:alpine                  fetching image content
└──index (81b6f81d6a6c)                         complete        |++++++++++++++++++++++++++++++++++++++|
   ├──manifest (c652b6ed7bee)                   complete        |++++++++++++++++++++++++++++++++++++++|
  └──config (d3882d80f0f6)                  complete        |++++++++++++++++++++++++++++++++++++++|
   ├──manifest (97b5fbd994ef)                   complete        |++++++++++++++++++++++++++++++++++++++|
  └──config (3b528d9f3868)                  complete        |++++++++++++++++++++++++++++++++++++++|
   ├──manifest (c560572f2aa9)                   complete        |++++++++++++++++++++++++++++++++++++++|
  └──config (4a6c79b4cf2a)                  complete        |++++++++++++++++++++++++++++++++++++++|
   ├──manifest (883c7c980a2f)                   complete        |++++++++++++++++++++++++++++++++++++++|
  ├──config (b95f59534a91)                  complete        |++++++++++++++++++++++++++++++++++++++|
  ├──layer (826f751c7f6d)                   complete        |++++++++++++++++++++++++++++++++++++++|
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  ├──layer (589002ba0eae)                   waiting         |--------------------------------------|
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  ├──layer (4f4fb700ef54)                   complete        |++++++++++++++++++++++++++++++++++++++|
  ├──layer (cb2f87994157)                   waiting         |--------------------------------------|
  └──layer (d67eeb8f9f36)                   complete        |++++++++++++++++++++++++++++++++++++++|
   ├──manifest (a99ef13a9ec0)                   complete        |++++++++++++++++++++++++++++++++++++++|
docker.io/library/redis:alpine                  fetching image content
└──index (81b6f81d6a6c)                         complete        |++++++++++++++++++++++++++++++++++++++|
   ├──manifest (c652b6ed7bee)                   complete        |++++++++++++++++++++++++++++++++++++++|
  └──config (d3882d80f0f6)                  complete        |++++++++++++++++++++++++++++++++++++++|
   ├──manifest (97b5fbd994ef)                   complete        |++++++++++++++++++++++++++++++++++++++|
  └──config (3b528d9f3868)                  complete        |++++++++++++++++++++++++++++++++++++++|
   ├──manifest (c560572f2aa9)                   complete        |++++++++++++++++++++++++++++++++++++++|
  └──config (4a6c79b4cf2a)                  complete        |++++++++++++++++++++++++++++++++++++++|
   ├──manifest (883c7c980a2f)                   complete        |++++++++++++++++++++++++++++++++++++++|
  ├──config (b95f59534a91)                  complete        |++++++++++++++++++++++++++++++++++++++|
  ├──layer (826f751c7f6d)                   complete        |++++++++++++++++++++++++++++++++++++++|
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  ├──layer (589002ba0eae)                   waiting         |--------------------------------------|
  ├──layer (cd9ebb746e5b)                   complete        |++++++++++++++++++++++++++++++++++++++|
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  ├──layer (cb2f87994157)                   waiting         |--------------------------------------|
  └──layer (d67eeb8f9f36)                   complete        |++++++++++++++++++++++++++++++++++++++|
   ├──manifest (a99ef13a9ec0)                   complete        |++++++++++++++++++++++++++++++++++++++|
docker.io/library/redis:alpine                  fetching image content
└──index (81b6f81d6a6c)                         complete        |++++++++++++++++++++++++++++++++++++++|
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docker.io/library/redis:alpine                  fetching image content
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docker.io/library/redis:alpine                  fetching image content
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docker.io/library/redis:alpine                  fetching image content
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docker.io/library/redis:alpine                  fetching image content
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docker.io/library/redis:alpine                  fetching image content
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docker.io/library/redis:alpine                  fetching image content
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docker.io/library/redis:alpine                  saved
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docker.io/library/redis:alpine                  saved
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docker.io/library/redis:alpine                  saved
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docker.io/library/redis:alpine                  saved
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application/vnd.oci.image.index.v1+json sha256:81b6f81d6a6c5b9019231a2e8eb10085e3a139a34f833dcc965a8a959b040b72
Completed pull from OCI Registry (docker.io/library/redis:alpine)       elapsed: 11.9s  total:  33.0 M  (2.8 MiB/s)
Running a container with ctr
kcserver@kcserver:~$ ctr run --rm docker.io/library/redis:alpine redis-container
Starting Redis Server
1:C 12 Apr 2026 07:15:34.882 * oO0OoO0OoO0Oo Redis is starting oO0OoO0OoO0Oo
1:C 12 Apr 2026 07:15:34.882 * Redis version=8.6.2, bits=64, commit=00000000, modified=1, pid=1, just started
1:C 12 Apr 2026 07:15:34.882 * Configuration loaded
1:M 12 Apr 2026 07:15:34.882 # You requested maxclients of 10000 requiring at least 10032 max file descriptors.
1:M 12 Apr 2026 07:15:34.882 # Server can't set maximum open files to 10032 because of OS error: Operation not permitted.
1:M 12 Apr 2026 07:15:34.882 # Current maximum open files is 1024. maxclients has been reduced to 992 to compensate for low ulimit. If you need higher maxclients increase 'ulimit -n'.
1:M 12 Apr 2026 07:15:34.882 * monotonic clock: POSIX clock_gettime
1:M 12 Apr 2026 07:15:34.883 * Running mode=standalone, port=6379.
1:M 12 Apr 2026 07:15:34.883 * <bf> RedisBloom version 8.6.0 (Git=unknown)
1:M 12 Apr 2026 07:15:34.883 * <bf> Registering configuration options: [
1:M 12 Apr 2026 07:15:34.883 * <bf>     { bf-error-rate       :      0.01 }
1:M 12 Apr 2026 07:15:34.883 * <bf>     { bf-initial-size     :       100 }
1:M 12 Apr 2026 07:15:34.883 * <bf>     { bf-expansion-factor :         2 }
1:M 12 Apr 2026 07:15:34.883 * <bf>     { cf-bucket-size      :         2 }
1:M 12 Apr 2026 07:15:34.883 * <bf>     { cf-initial-size     :      1024 }
1:M 12 Apr 2026 07:15:34.883 * <bf>     { cf-max-iterations   :        20 }
1:M 12 Apr 2026 07:15:34.883 * <bf>     { cf-expansion-factor :         1 }
1:M 12 Apr 2026 07:15:34.883 * <bf>     { cf-max-expansions   :        32 }
1:M 12 Apr 2026 07:15:34.883 * <bf> ]
1:M 12 Apr 2026 07:15:34.883 * Module 'bf' loaded from /usr/local/lib/redis/modules//redisbloom.so
1:M 12 Apr 2026 07:15:34.885 * <search> Redis version found by RedisSearch : 8.6.2 - oss
1:M 12 Apr 2026 07:15:34.885 * <search> RediSearch version 8.6.0 (Git=7782b97)
1:M 12 Apr 2026 07:15:34.885 * <search> Low level api version 1 initialized successfully
1:M 12 Apr 2026 07:15:34.885 * <search> gc: ON, prefix min length: 2, min word length to stem: 4, prefix max expansions: 200, query timeout (ms): 500, timeout policy: return, oom policy: return, cursor read size: 1000, cursor max idle (ms): 300000, max doctable size: 1000000, max number of search results:  1000000, default scorer: BM25STD, 
1:M 12 Apr 2026 07:15:34.885 * <search> Initialized thread pools!
1:M 12 Apr 2026 07:15:34.885 * <search> Disabled workers threadpool of size 0
1:M 12 Apr 2026 07:15:34.885 * <search> Subscribe to config changes
1:M 12 Apr 2026 07:15:34.885 * <search> Subscribe to cluster slot migration events
1:M 12 Apr 2026 07:15:34.885 * <search> Enabled role change notification
1:M 12 Apr 2026 07:15:34.885 * <search> Cluster configuration: AUTO partitions, type: 0, coordinator timeout: 0ms
1:M 12 Apr 2026 07:15:34.885 * Module 'search' loaded from /usr/local/lib/redis/modules//redisearch.so
1:M 12 Apr 2026 07:15:34.886 * <timeseries> RedisTimeSeries version 80600, git_sha=05fd355db748676861dc4c17d19c8c1ca74c0154
1:M 12 Apr 2026 07:15:34.886 * <timeseries> Redis version found by RedisTimeSeries : 8.6.2 - oss
1:M 12 Apr 2026 07:15:34.886 * <timeseries> Registering configuration options: [
1:M 12 Apr 2026 07:15:34.886 * <timeseries>     { ts-compaction-policy   :              }
1:M 12 Apr 2026 07:15:34.886 * <timeseries>     { ts-num-threads         :            3 }
1:M 12 Apr 2026 07:15:34.886 * <timeseries>     { ts-retention-policy    :            0 }
1:M 12 Apr 2026 07:15:34.886 * <timeseries>     { ts-duplicate-policy    :        block }
1:M 12 Apr 2026 07:15:34.886 * <timeseries>     { ts-chunk-size-bytes    :         4096 }
1:M 12 Apr 2026 07:15:34.886 * <timeseries>     { ts-encoding            :   compressed }
1:M 12 Apr 2026 07:15:34.886 * <timeseries>     { ts-ignore-max-time-diff:            0 }
1:M 12 Apr 2026 07:15:34.886 * <timeseries>     { ts-ignore-max-val-diff :     0.000000 }
1:M 12 Apr 2026 07:15:34.886 * <timeseries> ]
1:M 12 Apr 2026 07:15:34.886 * <timeseries> Detected redis oss
1:M 12 Apr 2026 07:15:34.886 * <timeseries> Subscribe to ASM events
1:M 12 Apr 2026 07:15:34.886 * <timeseries> Enabled diskless replication
1:M 12 Apr 2026 07:15:34.886 * Module 'timeseries' loaded from /usr/local/lib/redis/modules//redistimeseries.so
1:M 12 Apr 2026 07:15:34.886 * <ReJSON> Created new data type 'ReJSON-RL'
1:M 12 Apr 2026 07:15:34.886 * <ReJSON> version: 80600 git sha: unknown branch: unknown
1:M 12 Apr 2026 07:15:34.886 * <ReJSON> Exported RedisJSON_V1 API
1:M 12 Apr 2026 07:15:34.886 * <ReJSON> Exported RedisJSON_V2 API
1:M 12 Apr 2026 07:15:34.886 * <ReJSON> Exported RedisJSON_V3 API
1:M 12 Apr 2026 07:15:34.886 * <ReJSON> Exported RedisJSON_V4 API
1:M 12 Apr 2026 07:15:34.886 * <ReJSON> Exported RedisJSON_V5 API
1:M 12 Apr 2026 07:15:34.886 * <ReJSON> Exported RedisJSON_V6 API
1:M 12 Apr 2026 07:15:34.886 * <ReJSON> Enabled diskless replication
1:M 12 Apr 2026 07:15:34.886 * <ReJSON> Initialized shared string cache, thread safe: true.
1:M 12 Apr 2026 07:15:34.886 * Module 'ReJSON' loaded from /usr/local/lib/redis/modules//rejson.so
1:M 12 Apr 2026 07:15:34.886 * <search> Acquired RedisJSON_V6 API
1:M 12 Apr 2026 07:15:34.921 * Server initialized
1:M 12 Apr 2026 07:15:34.921 * Ready to accept connections tcp

nerdctl

Just now, we mentioned that ctr is a low-level tool and not really meant for end-users. For a more user-friendly experience, we can use nerdctl, which provides a Docker-compatible CLI while still leveraging containerd under the hood. Here are some of the features that nerdctl offers:
  • Supports Docker Compose
  • Supports rootless mode
  • Supports Lazy Pulling
  • Supports encrypted images
  • Supports P2P image distribution
  • Supports container image signing and verification
  • Apply Kubernetes namespaces for containers, etc
  • Provides a more familiar command structure for those used to Docker
Sample commands of nerdctl
nerdctl
nerdctl run -it ubuntu
nerdctl run -p 8080:8080 -d webapplication
nerdctl compose -f ./docker-compose.yaml up

crictl

crictl is a CLI tool for CRI-compatible container runtimes. It is primarily used for debugging and managing containers in Kubernetes environments. While ctr and nerdctl are more general-purpose tools for container management, crictl is specifically designed to interact with the Container Runtime Interface (CRI) used by Kubernetes.
Highly recommended to use crictl to debug Kubernetes nodes.
This tool is very useful for Kubernetes administrators and developers as they can direct debug the runtime without needing to install the full Kubernetes stack. It allows you to inspect and manage containers, pods, and images directly on the node, which can be crucial for troubleshooting issues in a Kubernetes cluster. Remember, crictl is not ideal for general container management (create/delete) outside of Kubernetes contexts, and it is not meant to replace tools like ctr or nerdctl for everyday container operations.
If you are using crictl to manage containers, for example, you create a container with crictl on the Kubernetes environment, you should be aware that container created by crictl will be deleted by Kubernetes after a while, because Kubernetes will detect that container is not managed by Kubernetes and will clean it up. As the kubelet will ensure a consistent state of the cluster by removing any containers that are not part of the desired state defined by Kubernetes.The reason is that crictl is using k8s.io namespace and interacts directly with the container runtime (like containerd) and does not register the containers it creates with Kubernetes. Therefore, Kubernetes will consider these containers as “orphaned” and will eventually clean them up to maintain the integrity of the cluster. While ctr and nerdctl both are the tools of containerd and bypass the CRI, the kubelet is “blind” to these containers, and thus they will not be automatically cleaned up by Kubernetes.
Sample commands of crictl
crictl help
crictl pull busybox
crictl images
crictl ps -a
crictl pods
Last modified on April 12, 2026