Recently, the Kubernetes community announced it is as a container runtime after v1.20. deprecating Docker Is Docker truly out of the game? Don't Panic: Kubernetes and Docker What does dockershim deprecation mean for KubeSphere users? Dockershim was a temporary solution proposed by the Kubernetes community to add support for Docker so that it could serve as its container runtime. Dockershim deprecation only means the code maintenance of Dockershim in the code repository of Kubernetes will stop. This is because Dockershim has become a heavy burden on the Kubernetes maintainers. After this change, the Kubernetes community will be able to maintain the Kubernetes Container Runtime Interface (CRI) only. In fact, all CRI-compliant runtimes can be the runtime for Kubernetes, such as CRI-O and containerd. Currently, Strictly speaking, what’s actually happening is that dockershim is being removed from Kubelet. In other words, Docker will not be used as the default container runtime. However, you may still integrate Docker into your environment. For more information, you can take a look at the official announcement of Kubernetes: is using Docker as the container runtime of Kubernetes. Meanwhile, it also supports any CRI-compliant implementations. For KubeSphere and Docker users, dockershim deprecation does not affect the existing KubeSphere system and will not take any toll on your cluster or on your business. KubeSphere users can continue to use Docker which has already been tested at scale. the KubeSphere container platform In future releases, other KubeSphere components, such as DevOps, will support these container runtimes and you will be able to use these CRI implementations. The next game-changers: containerd, CRI-O, and iSula containerd , a Cloud Native Computing Foundation graduated project, is an industry-standard container runtime with an emphasis on simplicity, robustness and portability. It manages the complete container lifecycle of its host system. containerd CRI-O , an open-source project started by Red Hat, is an implementation of the Kubernetes CRI to enable using OCI (Open Container Initiative) compatible runtimes. It allows Kubernetes to use any OCI-compliant runtime as the container runtime for running Pods. CRI-O iSula is an open-source container solution with unified architecture design to meet different requirements in CT and IT fields. Lightweight containers are implemented using C/C++. They are smart, fast, and not restricted by hardware and architecture. With less noise floor overhead, the containers can be widely used. iSula Deploy containerd, CRI-O, and iSula As KubeSphere supports any implementation of the Kubernetes CRI, you can easily deploy containerd, CRI-O or iSula and integrate one of them into KubeSphere. Note that in a multi-node cluster, the container runtime should be the same on all nodes. containerd 1.Install runc. curl -OL https: //github.com/opencontainers/runc/releases/download/v1.0.0-rc92/runc.amd64 mv runc.amd64 /usr/local/bin/runc && chmod +x /usr/local/bin/runc 2. Download the containerd installation package. curl -OL https: //github.com/containerd/containerd/releases/download/v1.4.3/containerd-1.4.3-linux-amd64.tar.gz tar -zxvf containerd -linux-amd64.tar.gz -C /usr/local -1.4 .3 curl -o /etc/systemd/system/containerd.service https: //raw.githubusercontent.com/containerd/cri/master/contrib/systemd-units/containerd.service 3. Configure containerd. mkdir -p /etc/containerd cat > containerd/config.toml << EOF
[plugins]
  [plugins. ]
    sandbox_image = [plugins. .registry]
      [plugins. .registry.mirrors]
        [plugins. .registry.mirrors. ]
          endpoint = [ ]     ## You can input your registry mirror.
EOF /etc/ "io.containerd.grpc.v1.cri" "kubesphere/pause:3.2" "io.containerd.grpc.v1.cri" "io.containerd.grpc.v1.cri" "io.containerd.grpc.v1.cri" "docker.io" "https://registry-1.docker.io" systemctl enable containerd && systemctl restart containerd 4. Install crictl. VERSION= "v1.19.0" curl -OL https: //github.com/kubernetes-sigs/cri-tools/releases/download/$VERSION/crictl-$VERSION-linux-amd64.tar.gz sudo tar zxvf crictl-$VERSION-linux-amd64.tar.gz -C /usr/local/bin rm -f crictl-$VERSION-linux-amd64.tar.gz 5. Configure crictl. cat > crictl.yaml << EOF
runtime-endpoint: unix: image-endpoint: unix: timeout: debug: pull-image-on-create: EOF /etc/ ///run/containerd/containerd.sock ///run/containerd/containerd.sock 2 false false CRI-O 1. Download and install CRI-O. yum install git make curl -OL https: //github.com/cri-o/cri-o/releases/download/v1.18.4/crio-v1.18.4.tar.gz tar -zxf crio-v1 .tar.gz .18 .4 cd crio-v1 .18 .4 mkdir -p /etc/crio /opt/cni/bin /usr/local/share/oci-umount/oci-umount.d /usr/local/lib/systemd/system mkdir -p /etc/crio /opt/cni/bin /usr/local/share/oci-umount/oci-umount.d /usr/local/lib/systemd/system make install echo >> sysctl.conf "fs.may_detach_mounts=1" /etc/ sysctl -p 2. Configure CRI-O. vi /etc/crio/crio.conf Navigate to the following fields and make changes. pause_image = registries = [ ## You can input your registry mirror.
] "kubesphere/pause:3.2" "docker.io" 3. Start CRI-O. systemctl enable crio && systemctl restart crio iSula (openEuler 20.09) 1. Install iSula on openEuler 20.09. yum install iSulad -y 2. Configure iSula. vim /etc/isulad/daemon.json 3. Navigate to the following fields and make changes. : [ ## You can input your registry mirror.
 ] : : : : "registry-mirrors" "docker.io" "pod-sandbox-image" "kubesphere/pause:3.2" "network-plugin" "cni" "cni-bin-dir" "/opt/cni/bin" "cni-conf-dir" "/etc/cni/net.d" 4. Start iSula. systemctl enable isulad && systemctl restart isulad Deploy Kuberenetes and KubeSphere using KubeKey We can use the open-source tool to quickly deploy both Kubernetes and KubeSphere. KubeKey 1.  Download KubeKey v1.1.0-alpha.1 to create a cluster. This is an alpha version and future releases will also support the integration of different container runtimes. curl -OL https: //github.com/kubesphere/kubekey/releases/download/v1.1.0-alpha.1/kubekey-v1.1.0-alpha.1-linux-amd64.tar.gz tar -zxvf  kubekey-v1 -alpha -linux-amd64.tar.gz .1 .0 .1 2. Make kk executable. chmod +x kk 3. Create a configuration file. For example, run the following command to create the configuration for KubeSphere v3.0.0. ./kk create config -- -kubesphere v3 with .0 .0 4. Edit the configuration file (default file name: config-sample.yaml). $ vi config-sample.yaml
apiVersion: kubekey.kubesphere.io/v1alpha1
kind: Cluster
...
  kubernetes:
    version: v1 imageRepo: kubesphere
    clusterName: cluster.local
    containerManager: containerd ## Input the container runtime: containerd/crio/isula
... .17 .9 Note For more information about the configuration file and installation, see Multi-node Installation . 5. Create a cluster. ./kk create cluster -f config-sample.yaml Access the KubeSphere console to verify the runtime After you deploy the cluster, you can access the web console of KubeSphere. On the page, check the container runtime that your cluster is using. Cluster Management containerd CRI-O iSula on openEuler 20.09 Reference KubeSphere GitHub Kubernetes Blog KubeSphere Documentation Dockershim Deprecation FAQ

Dockershim Deprecation: Is Docker Truly out of Game?

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