cri-dockerd是什麼?
在 Kubernetes v1.24 及更早版本中，我們使用docker作為容器引擎在k8s上使用時，依賴一個dockershim的內建k8s元件；k8s v1.24發行版中將dockershim元件給移除了；取而代之的就是cri-dockerd(當然還有其它容器介面)；簡單講CRI就是容器執行時介面（Container Runtime Interface,CRI），也就是說cri-dockerd就是以docker作為容器引擎而提供的容器執行時介面；即我們想要用docker作為k8s的容器執行引擎，我們需要先部署好cri-dockerd;用cri-dockerd來與kubelet互動，然後再由cri-dockerd和docker api互動，使我們在k8s能夠正常使用docker作為容器引擎；
好了，接下來我們先來說一下部署環境
OS：Ubuntu 22.04.2
Container Runtime:Docker CE 23.0.1
CRI:cri-dockerd:0.3.0
以下步驟需要在每個伺服器上都要部署
部署時間服務chronyd
apt update && apt install chrony
配置阿里雲時間伺服器
pool ntp1.aliyun.com iburst maxsources 4
提示：在/etc/chrony/chrony.conf中加入上述配置，將其他pool開頭的配置註釋掉；
重啟chrony,並驗證
root@k8s-master01:~# systemctl restart chrony
root@k8s-master01:~# systemctl status chrony
● chrony.service - chrony, an NTP client/server
Loaded: loaded (/lib/systemd/system/chrony.service; enabled; vendor preset: enabled)
Active: active (running) since Sat 2023-04-01 20:22:44 CST; 6s ago
Docs: man:chronyd(8)
man:chronyc(1)
man:chrony.conf(5)
Process: 3052 ExecStart=/usr/lib/systemd/scripts/chronyd-starter.sh $DAEMON_OPTS (code=exited, status=0/SUCCESS)
Main PID: 3061 (chronyd)
Tasks: 2 (limit: 4530)
Memory: 1.3M
CPU: 40ms
CGroup: /system.slice/chrony.service
├─3061 /usr/sbin/chronyd -F 1
└─3062 /usr/sbin/chronyd -F 1
Apr 01 20:22:44 k8s-master01.ik8s.cc systemd[1]: Starting chrony, an NTP client/server...
Apr 01 20:22:44 k8s-master01.ik8s.cc chronyd[3061]: chronyd version 4.2 starting (+CMDMON +NTP +REFCLOCK +RTC +PRIVDROP +SCFILTER +SIGND +>
Apr 01 20:22:44 k8s-master01.ik8s.cc chronyd[3061]: Frequency -3.785 +/- 18.293 ppm read from /var/lib/chrony/chrony.drift
Apr 01 20:22:44 k8s-master01.ik8s.cc chronyd[3061]: Using right/UTC timezone to obtain leap second data
Apr 01 20:22:44 k8s-master01.ik8s.cc chronyd[3061]: Loaded seccomp filter (level 1)
Apr 01 20:22:44 k8s-master01.ik8s.cc systemd[1]: Started chrony, an NTP client/server.
Apr 01 20:22:50 k8s-master01.ik8s.cc chronyd[3061]: Selected source 120.25.115.20 (ntp1.aliyun.com)
Apr 01 20:22:50 k8s-master01.ik8s.cc chronyd[3061]: System clock TAI offset set to 37 seconds
root@k8s-master01:~# chronyc sources
MS Name/IP address Stratum Poll Reach LastRx Last sample
===============================================================================
^* ntp1.aliyun.com 2 6 17 13 +950us[+3545us] +/- 23ms
root@k8s-master01:~#
提示：使用chronyc sources命令能夠看到從那個伺服器同步時間，能夠看我們配置的伺服器地址就表示chrony服務配置沒有問題；
借用hosts檔案做主機名解析
root@k8s-master01:~# cat /etc/hosts 127.0.0.1 localhost 127.0.1.1 k8s-server # The following lines are desirable for IPv6 capable hosts ::1 ip6-localhost ip6-loopback fe00::0 ip6-localnet ff00::0 ip6-mcastprefix ff02::1 ip6-allnodes ff02::2 ip6-allrouters 192.168.0.51 kubeapi.ik8s.cc kubeapi 192.168.0.51 k8s-master01.ik8s.cc k8s-master01 192.168.0.52 k8s-master02.ik8s.cc k8s-master02 192.168.0.53 k8s-master03.ik8s.cc k8s-master03 192.168.0.54 k8s-node01.ik8s.cc k8s-node01 192.168.0.55 k8s-node02.ik8s.cc k8s-node02 192.168.0.56 k8s-node03.ik8s.cc k8s-node03 root@k8s-master01:~#
各節點禁用swap裝置
root@k8s-master01:~# swapoff -a root@k8s-master01:~# cat /etc/fstab # /etc/fstab: static file system information. # # Use 'blkid' to print the universally unique identifier for a # device; this may be used with UUID= as a more robust way to name devices # that works even if disks are added and removed. See fstab(5). # # <file system> <mount point> <type> <options> <dump> <pass> # / was on /dev/ubuntu-vg/ubuntu-lv during curtin installation /dev/disk/by-id/dm-uuid-LVM-TjXApGigP3NsOAzv7UAMUgV9BdMSVlrxfAjm6qSYs1DxA8Nzmr2DKaODbQf48e2m / ext4 defaults 0 1 # /boot was on /dev/sda2 during curtin installation /dev/disk/by-uuid/db6b3290-0968-4e77-bdd7-ddc849cdda26 /boot ext4 defaults 0 1 #/swap.img none swap sw 0 0 root@k8s-master01:~#
提示：將fstab檔案中，又不安swap裝置的配置註釋掉即可；
各節點禁用預設配置防火牆
root@k8s-master01:~# ufw disable Firewall stopped and disabled on system startup root@k8s-master01:~# ufw status Status: inactive root@k8s-master01:~#
安裝docker
~# apt install apt-transport-https ca-certificates curl software-properties-common -y ~# curl -fsSL http://mirrors.aliyun.com/docker-ce/linux/ubuntu/gpg | apt-key add - ~# add-apt-repository "deb [arch=amd64] http://mirrors.aliyun.com/docker-ce/linux/ubuntu $(lsb_release -cs) stable" ~# apt update
~# apt install docker-ce
配置docker容器引擎使用systemd作為CGroup的驅動
~# cat /etc/docker/daemon.json
{
"registry-mirrors": [
],
"exec-opts": ["native.cgroupdriver=systemd"],
"log-driver": "json-file",
"log-opts": {
"max-size": "200m"
},
"storage-driver": "overlay2"
}
提示：如果你沒有代理，也可以使用registry-mirrors來指明使用的映象加速服務；
啟動docker服務
systemctl daemon-reload && systemctl start docker && systemctl enable docker
配置docker使用代理服務
Environment="HTTP_PROXY=http://$PROXY_SERVER_IP:$PROXY_PORT" Environment="HTTPS_PROXY=https://$PROXY_SERVER_IP:$PROXY_PORT" Environment="NO_PROXY=127.0.0.0/8,172.17.0.0/16,10.244.0.0/16,192.168.0.0/16,10.0.0.0/8,cluster.local"
提示：在/usr/lib/systemd/system/docker.service檔案中加入以上配置，把自己的代理伺服器地址更換上述$PROXY_SERVER_IP:$PROXY_PORT
即可；
過載和重啟docker服務
~# systemctl daemon-reload ~# systemctl restart docker
安裝cri-dockerd
~# curl -LO https://github.com/Mirantis/cri-dockerd/releases/download/v0.3.0/cri-dockerd_0.3.0.3-0.ubuntu-jammy_amd64.deb ~# apt install ./cri-dockerd_0.3.0.3-0.ubuntu-jammy_amd64.deb
提示：安裝完cri-dockerd以後，對應服務會自動啟動；
在各主機上生成kubelet和kubeadm等相關程式包的倉庫
~# apt update && apt install -y apt-transport-https curl ~# curl -fsSL https://mirrors.aliyun.com/kubernetes/apt/doc/apt-key.gpg | apt-key add - ~# cat <<EOF >/etc/apt/sources.list.d/kubernetes.list deb https://mirrors.aliyun.com/kubernetes/apt/ kubernetes-xenial main EOF ~# apt update
安裝kubelet、kubeadm和kubectl
~# apt install -y kubelet kubeadm kubectl ~# systemctl enable kubelet
確認版本
root@k8s-master01:~# kubeadm version
kubeadm version: &version.Info{Major:"1", Minor:"26", GitVersion:"v1.26.3", GitCommit:"9e644106593f3f4aa98f8a84b23db5fa378900bd", GitTreeState:"clean", BuildDate:"2023-03-15T13:38:47Z", GoVersion:"go1.19.7", Compiler:"gc", Platform:"linux/amd64"}
root@k8s-master01:~#
整合kubelet和cri-dockerd
配置cri-dockerd
ExecStart=/usr/bin/cri-dockerd --container-runtime-endpoint fd:// --network-plugin=cni --cni-bin-dir=/opt/cni/bin --cni-cache-dir=/var/lib/ cni/cache --cni-conf-dir=/etc/cni/net.d
提示：在/usr/lib/systemd/system/cri-docker.service檔案中新增上如上配置；--network-plugin：指定網路外掛規範的型別，這裡要使用CNI；--cni-bin-dir：指定CNI外掛二進位制程式檔案的搜尋目錄；--cni-cache-dir：CNI外掛使用的快取目錄；--cni-conf-dir：CNI外掛載入配置檔案的目錄；
重啟cri-dockerd服務
~# systemctl daemon-reload && systemctl restart cri-docker
配置kubelet
root@k8s-master01:~# cat /etc/sysconfig/kubelet KUBELET_KUBEADM_ARGS="--container-runtime=remote --container-runtime-endpoint=/run/cri-dockerd.sock" root@k8s-master01:~#
提示：如果沒有sysconfig目錄，請先建立，然後再建立kubelet檔案；這一步就是告訴kubelet cri-dockerd的介面在哪裡；該配置不是必須的，我們也可以在初始化叢集時在kubeadm命令上使用“--cri-socket unix:///run/cri-dockerd.sock”選項來告訴kubelet cri-dockerd的socket檔案路徑；
初始化第一個master節點
列出映象資訊
root@k8s-master01:~# kubeadm config images list registry.k8s.io/kube-apiserver:v1.26.3 registry.k8s.io/kube-controller-manager:v1.26.3 registry.k8s.io/kube-scheduler:v1.26.3 registry.k8s.io/kube-proxy:v1.26.3 registry.k8s.io/pause:3.9 registry.k8s.io/etcd:3.5.6-0 registry.k8s.io/coredns/coredns:v1.9.3 root@k8s-master01:~#
提示：k8s的映象預設是谷歌倉庫地址，需要代理才可以正常訪問；如果你沒有代理，請使用阿里雲倉庫也是可以的；用--image-repository="registry.aliyuncs.com/google_containers"來指定使用阿里雲映象倉庫中的映象部署k8s叢集；
下載映象
root@k8s-master01:~# kubeadm config images pull Found multiple CRI endpoints on the host. Please define which one do you wish to use by setting the 'criSocket' field in the kubeadm configuration file: unix:///var/run/containerd/containerd.sock, unix:///var/run/cri-dockerd.sock To see the stack trace of this error execute with --v=5 or higher root@k8s-master01:~#
提示：這裡是讓我們指定cri-dockerd的socket檔案路徑；
root@k8s-master01:~# kubeadm config images pull --cri-socket unix:///var/run/cri-dockerd.sock [config/images] Pulled registry.k8s.io/kube-apiserver:v1.26.3 [config/images] Pulled registry.k8s.io/kube-controller-manager:v1.26.3 [config/images] Pulled registry.k8s.io/kube-scheduler:v1.26.3 [config/images] Pulled registry.k8s.io/kube-proxy:v1.26.3 [config/images] Pulled registry.k8s.io/pause:3.9 [config/images] Pulled registry.k8s.io/etcd:3.5.6-0 [config/images] Pulled registry.k8s.io/coredns/coredns:v1.9.3 root@k8s-master01:~# docker images REPOSITORY TAG IMAGE ID CREATED SIZE registry.k8s.io/kube-apiserver v1.26.3 1d9b3cbae03c 2 weeks ago 134MB registry.k8s.io/kube-controller-manager v1.26.3 ce8c2293ef09 2 weeks ago 123MB registry.k8s.io/kube-scheduler v1.26.3 5a7904736932 2 weeks ago 56.4MB registry.k8s.io/kube-proxy v1.26.3 92ed2bec97a6 2 weeks ago 65.6MB registry.k8s.io/etcd 3.5.6-0 fce326961ae2 4 months ago 299MB registry.k8s.io/pause 3.9 e6f181688397 5 months ago 744kB registry.k8s.io/coredns/coredns v1.9.3 5185b96f0bec 10 months ago 48.8MB root@k8s-master01:~#
提示：用上述命令就可以把初始化k8s叢集所需映象pull到本地；
初始化第一個master節點
kubeadm init \
--control-plane-endpoint="kubeapi.ik8s.cc" \
--kubernetes-version=v1.26.3 \
--pod-network-cidr=10.244.0.0/16 \
--service-cidr=10.96.0.0/12 \
--token-ttl=0 \
--cri-socket unix:///run/cri-dockerd.sock \
--upload-certs
提示：如果要指定倉庫地址，請使用--image-repository選項來指定對應倉庫；
root@k8s-master01:~# kubeadm init \
> --control-plane-endpoint="kubeapi.ik8s.cc" \
> --kubernetes-version=v1.26.3 \
> --pod-network-cidr=10.244.0.0/16 \
> --service-cidr=10.96.0.0/12 \
> --token-ttl=0 \
> --cri-socket unix:///run/cri-dockerd.sock \
> --upload-certs
[init] Using Kubernetes version: v1.26.3
[preflight] Running pre-flight checks
[preflight] Pulling images required for setting up a Kubernetes cluster
[preflight] This might take a minute or two, depending on the speed of your internet connection
[preflight] You can also perform this action in beforehand using 'kubeadm config images pull'
[certs] Using certificateDir folder "/etc/kubernetes/pki"
[certs] Generating "ca" certificate and key
[certs] Generating "apiserver" certificate and key
[certs] apiserver serving cert is signed for DNS names [k8s-master01.ik8s.cc kubeapi.ik8s.cc kubernetes kubernetes.default kubernetes.default.svc kubernetes.default.svc.cluster.local] and IPs [10.96.0.1 192.168.0.51]
[certs] Generating "apiserver-kubelet-client" certificate and key
[certs] Generating "front-proxy-ca" certificate and key
[certs] Generating "front-proxy-client" certificate and key
[certs] Generating "etcd/ca" certificate and key
[certs] Generating "etcd/server" certificate and key
[certs] etcd/server serving cert is signed for DNS names [k8s-master01.ik8s.cc localhost] and IPs [192.168.0.51 127.0.0.1 ::1]
[certs] Generating "etcd/peer" certificate and key
[certs] etcd/peer serving cert is signed for DNS names [k8s-master01.ik8s.cc localhost] and IPs [192.168.0.51 127.0.0.1 ::1]
[certs] Generating "etcd/healthcheck-client" certificate and key
[certs] Generating "apiserver-etcd-client" certificate and key
[certs] Generating "sa" key and public key
[kubeconfig] Using kubeconfig folder "/etc/kubernetes"
[kubeconfig] Writing "admin.conf" kubeconfig file
[kubeconfig] Writing "kubelet.conf" kubeconfig file
[kubeconfig] Writing "controller-manager.conf" kubeconfig file
[kubeconfig] Writing "scheduler.conf" kubeconfig file
[kubelet-start] Writing kubelet environment file with flags to file "/var/lib/kubelet/kubeadm-flags.env"
[kubelet-start] Writing kubelet configuration to file "/var/lib/kubelet/config.yaml"
[kubelet-start] Starting the kubelet
[control-plane] Using manifest folder "/etc/kubernetes/manifests"
[control-plane] Creating static Pod manifest for "kube-apiserver"
[control-plane] Creating static Pod manifest for "kube-controller-manager"
[control-plane] Creating static Pod manifest for "kube-scheduler"
[etcd] Creating static Pod manifest for local etcd in "/etc/kubernetes/manifests"
[wait-control-plane] Waiting for the kubelet to boot up the control plane as static Pods from directory "/etc/kubernetes/manifests". This can take up to 4m0s
[apiclient] All control plane components are healthy after 5.503108 seconds
[upload-config] Storing the configuration used in ConfigMap "kubeadm-config" in the "kube-system" Namespace
[kubelet] Creating a ConfigMap "kubelet-config" in namespace kube-system with the configuration for the kubelets in the cluster
[upload-certs] Storing the certificates in Secret "kubeadm-certs" in the "kube-system" Namespace
[upload-certs] Using certificate key:
e0ccb2457a9290a7b917e2a9c4eab81f6f1cd208db5b2bb863d91b51f922b8bf
[mark-control-plane] Marking the node k8s-master01.ik8s.cc as control-plane by adding the labels: [node-role.kubernetes.io/control-plane node.kubernetes.io/exclude-from-external-load-balancers]
[mark-control-plane] Marking the node k8s-master01.ik8s.cc as control-plane by adding the taints [node-role.kubernetes.io/control-plane:NoSchedule]
[bootstrap-token] Using token: a6zxug.lq05a0itb783hv96
[bootstrap-token] Configuring bootstrap tokens, cluster-info ConfigMap, RBAC Roles
[bootstrap-token] Configured RBAC rules to allow Node Bootstrap tokens to get nodes
[bootstrap-token] Configured RBAC rules to allow Node Bootstrap tokens to post CSRs in order for nodes to get long term certificate credentials
[bootstrap-token] Configured RBAC rules to allow the csrapprover controller automatically approve CSRs from a Node Bootstrap Token
[bootstrap-token] Configured RBAC rules to allow certificate rotation for all node client certificates in the cluster
[bootstrap-token] Creating the "cluster-info" ConfigMap in the "kube-public" namespace
[kubelet-finalize] Updating "/etc/kubernetes/kubelet.conf" to point to a rotatable kubelet client certificate and key
[addons] Applied essential addon: CoreDNS
[addons] Applied essential addon: kube-proxy
Your Kubernetes control-plane has initialized successfully!
To start using your cluster, you need to run the following as a regular user:
mkdir -p $HOME/.kube
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config
Alternatively, if you are the root user, you can run:
export KUBECONFIG=/etc/kubernetes/admin.conf
You should now deploy a pod network to the cluster.
Run "kubectl apply -f [podnetwork].yaml" with one of the options listed at:
https://kubernetes.io/docs/concepts/cluster-administration/addons/
You can now join any number of the control-plane node running the following command on each as root:
kubeadm join kubeapi.ik8s.cc:6443 --token a6zxug.lq05a0itb783hv96 \
--discovery-token-ca-cert-hash sha256:07095e3d4747fdac7e44efeb9f657d102c48c8bbcec608d98648e88cfe954791 \
--control-plane --certificate-key e0ccb2457a9290a7b917e2a9c4eab81f6f1cd208db5b2bb863d91b51f922b8bf
Please note that the certificate-key gives access to cluster sensitive data, keep it secret!
As a safeguard, uploaded-certs will be deleted in two hours; If necessary, you can use
"kubeadm init phase upload-certs --upload-certs" to reload certs afterward.
Then you can join any number of worker nodes by running the following on each as root:
kubeadm join kubeapi.ik8s.cc:6443 --token a6zxug.lq05a0itb783hv96 \
--discovery-token-ca-cert-hash sha256:07095e3d4747fdac7e44efeb9f657d102c48c8bbcec608d98648e88cfe954791
root@k8s-master01:~#
提示：能夠看到上訴資訊，說明第一個k8s主節點就初始化成功；按照上述提示，完成後續步驟即可；
複製配置檔案到本地使用者家目錄，並建立.kube目錄
root@k8s-master01:~# mkdir -p $HOME/.kube root@k8s-master01:~# cp -i /etc/kubernetes/admin.conf $HOME/.kube/config root@k8s-master01:~# chown $(id -u):$(id -g) $HOME/.kube/config root@k8s-master01:~#
部署網路外掛
下載網路外掛calico的部署清單
root@k8s-master01:~# wget https://docs.projectcalico.org/v3.25/manifests/calico.yaml --no-check-certificate --2023-04-02 10:25:42-- https://docs.projectcalico.org/v3.25/manifests/calico.yaml Resolving docs.projectcalico.org (docs.projectcalico.org)... 34.124.186.36, 34.126.184.144, 2406:da18:880:3801::c8, ... Connecting to docs.projectcalico.org (docs.projectcalico.org)|34.124.186.36|:443... connected. HTTP request sent, awaiting response... 301 Moved Permanently Location: https://docs.tigera.io/archive/v3.25/manifests/calico.yaml [following] --2023-04-02 10:25:44-- https://docs.tigera.io/archive/v3.25/manifests/calico.yaml Resolving docs.tigera.io (docs.tigera.io)... 34.142.149.67, 18.139.194.139, 2406:da18:880:3800::c8, ... Connecting to docs.tigera.io (docs.tigera.io)|34.142.149.67|:443... connected. HTTP request sent, awaiting response... 200 OK Length: 238089 (233K) [text/yaml] Saving to: ‘calico.yaml’ calico.yaml 100%[=======================================================================================>] 232.51K 51.0KB/s in 4.6s 2023-04-02 10:25:50 (51.0 KB/s) - ‘calico.yaml’ saved [238089/238089] root@k8s-master01:~#
在k8s叢集上應用清單
root@k8s-master01:~# kubectl apply -f calico.yaml poddisruptionbudget.policy/calico-kube-controllers created serviceaccount/calico-kube-controllers created serviceaccount/calico-node created configmap/calico-config created customresourcedefinition.apiextensions.k8s.io/bgpconfigurations.crd.projectcalico.org created customresourcedefinition.apiextensions.k8s.io/bgppeers.crd.projectcalico.org created customresourcedefinition.apiextensions.k8s.io/blockaffinities.crd.projectcalico.org created customresourcedefinition.apiextensions.k8s.io/caliconodestatuses.crd.projectcalico.org created customresourcedefinition.apiextensions.k8s.io/clusterinformations.crd.projectcalico.org created customresourcedefinition.apiextensions.k8s.io/felixconfigurations.crd.projectcalico.org created customresourcedefinition.apiextensions.k8s.io/globalnetworkpolicies.crd.projectcalico.org created customresourcedefinition.apiextensions.k8s.io/globalnetworksets.crd.projectcalico.org created customresourcedefinition.apiextensions.k8s.io/hostendpoints.crd.projectcalico.org created customresourcedefinition.apiextensions.k8s.io/ipamblocks.crd.projectcalico.org created customresourcedefinition.apiextensions.k8s.io/ipamconfigs.crd.projectcalico.org created customresourcedefinition.apiextensions.k8s.io/ipamhandles.crd.projectcalico.org created customresourcedefinition.apiextensions.k8s.io/ippools.crd.projectcalico.org created customresourcedefinition.apiextensions.k8s.io/ipreservations.crd.projectcalico.org created customresourcedefinition.apiextensions.k8s.io/kubecontrollersconfigurations.crd.projectcalico.org created customresourcedefinition.apiextensions.k8s.io/networkpolicies.crd.projectcalico.org created customresourcedefinition.apiextensions.k8s.io/networksets.crd.projectcalico.org created clusterrole.rbac.authorization.k8s.io/calico-kube-controllers created clusterrole.rbac.authorization.k8s.io/calico-node created clusterrolebinding.rbac.authorization.k8s.io/calico-kube-controllers created clusterrolebinding.rbac.authorization.k8s.io/calico-node created daemonset.apps/calico-node created deployment.apps/calico-kube-controllers created root@k8s-master01:~#
檢視節點是否準備就緒？對應calico pod是否running?
root@k8s-master01:~# kubectl get nodes NAME STATUS ROLES AGE VERSION k8s-master01.ik8s.cc Ready control-plane 11m v1.26.3 root@k8s-master01:~# kubectl get pods -n kube-system NAME READY STATUS RESTARTS AGE calico-kube-controllers-57b57c56f-wvh56 1/1 Running 0 4m40s calico-node-fjhf7 1/1 Running 0 4m40s coredns-787d4945fb-68js9 1/1 Running 0 11m coredns-787d4945fb-8q5l5 1/1 Running 0 11m etcd-k8s-master01.ik8s.cc 1/1 Running 0 11m kube-apiserver-k8s-master01.ik8s.cc 1/1 Running 0 11m kube-controller-manager-k8s-master01.ik8s.cc 1/1 Running 0 11m kube-proxy-dxmcz 1/1 Running 0 11m kube-scheduler-k8s-master01.ik8s.cc 1/1 Running 0 11m root@k8s-master01:~#
提示：能夠看到master01已經準備就緒，對應pod也都正常running，到此第一個master節點就準備就緒；
加入node節點
root@k8s-node01:~# kubeadm join kubeapi.ik8s.cc:6443 --token a6zxug.lq05a0itb783hv96 \ > --discovery-token-ca-cert-hash sha256:07095e3d4747fdac7e44efeb9f657d102c48c8bbcec608d98648e88cfe954791 --cri-socket unix:///run/cri-dockerd.sock [preflight] Running pre-flight checks [preflight] Reading configuration from the cluster... [preflight] FYI: You can look at this config file with 'kubectl -n kube-system get cm kubeadm-config -o yaml' [kubelet-start] Writing kubelet configuration to file "/var/lib/kubelet/config.yaml" [kubelet-start] Writing kubelet environment file with flags to file "/var/lib/kubelet/kubeadm-flags.env" [kubelet-start] Starting the kubelet [kubelet-start] Waiting for the kubelet to perform the TLS Bootstrap... This node has joined the cluster: * Certificate signing request was sent to apiserver and a response was received. * The Kubelet was informed of the new secure connection details. Run 'kubectl get nodes' on the control-plane to see this node join the cluster. root@k8s-node01:~#
提示：能夠看到上述資訊表示node節點加入成功；這裡需要注意的是，加入node節點，需要指定cri-dockerd的socket檔案位置；
驗證：檢視三個節點是否都以正常加入叢集？
root@k8s-master01:~# kubectl get nodes NAME STATUS ROLES AGE VERSION k8s-master01.ik8s.cc Ready control-plane 15m v1.26.3 k8s-node01.ik8s.cc Ready <none> 53s v1.26.3 k8s-node02.ik8s.cc Ready <none> 11s v1.26.3 k8s-node03.ik8s.cc Ready <none> 5s v1.26.3 root@k8s-master01:~#
提示：可以看到現在有3個node節點，都處於就緒狀態；
驗證：kube-system名稱空間下的pods是否都running?
root@k8s-master01:~# kubectl get pods -n kube-system NAME READY STATUS RESTARTS AGE calico-kube-controllers-57b57c56f-wvh56 1/1 Running 0 9m49s calico-node-5wg79 1/1 Running 0 92s calico-node-fjhf7 1/1 Running 0 9m49s calico-node-h9rpm 1/1 Running 0 86s calico-node-s5p6c 1/1 Running 0 2m14s coredns-787d4945fb-68js9 1/1 Running 0 16m coredns-787d4945fb-8q5l5 1/1 Running 0 16m etcd-k8s-master01.ik8s.cc 1/1 Running 0 16m kube-apiserver-k8s-master01.ik8s.cc 1/1 Running 0 16m kube-controller-manager-k8s-master01.ik8s.cc 1/1 Running 0 16m kube-proxy-8twxn 1/1 Running 0 86s kube-proxy-dxmcz 1/1 Running 0 16m kube-proxy-fjqww 1/1 Running 0 92s kube-proxy-hdllg 1/1 Running 0 2m14s kube-scheduler-k8s-master01.ik8s.cc 1/1 Running 0 16m root@k8s-master01:~#
提示：可以看到kube-system名稱空間下的pod都running且都是處於就緒狀態；至此基於cri-dockerd和docker的單master節點的k8s叢集就搭建好了；