基于docker和cri-dockerd部署k8sv1.26.3

　　cri-dockerd是什么?

　　在 Kubernetes v1.24 及更早版本中，我们使用docker作为容器引擎在k8s上使用时，依赖一个dockershim的内置k8s组件；k8s v1.24发行版中将dockershim组件给移除了；取而代之的就是cri-dockerd(当然还有其它容器接口)；简单讲CRI就是容器运行时接口（Container Runtime Interface,CRI），也就是说cri-dockerd就是以docker作为容器引擎而提供的容器运行时接口；即我们想要用docker作为k8s的容器运行引擎，我们需要先部署好cri-dockerd;用cri-dockerd来与kubelet交互，然后再由cri-dockerd和docker api交互，使我们在k8s能够正常使用docker作为容器引擎；

　　好了，接下来我们先来说一下部署环境

　　OS：Ubuntu 22.04.2

　　Container Runtime:Docker CE 23.0.1

　　CRI:cri-dockerd:0.3.0

　　以下步骤需要在每个服务器上都要部署

　　部署时间服务chronyd

1	`apt update && apt` `install` `chrony`

　　配置阿里云时间服务器

1	`pool ntp1.aliyun.com iburst maxsources 4`

　　提示：在/etc/chrony/chrony.conf中加入上述配置，将其他pool开头的配置注释掉；

　　重启chrony,并验证

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命令能够看到从那个服务器同步时间，能够看我们配置的服务器地址就表示chrony服务配置没有问题；

　　借用hosts文件做主机名解析

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:~# 

　　各节点禁用swap设备

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).
#
#                
# / 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：将fstab文件中，又不安swap设备的配置注释掉即可；

　　各节点禁用默认配置防火墙

root@k8s-master01:~# ufw disable
Firewall stopped and disabled on system startup
root@k8s-master01:~# ufw status
Status: inactive
root@k8s-master01:~# 

　　安装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作为CGroup的驱动

~# 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：如果你没有代理，也可以使用registry-mirrors来指明使用的镜像加速服务；

　　启动docker服务

1	`systemctl daemon-reload && systemctl start docker && systemctl` `enable` `docker`

　　配置docker使用代理服务

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文件中加入以上配置，把自己的代理服务器地址更换上述$PROXY_SERVER_IP:$PROXY_PORT

即可；

　　重载和重启docker服务

1 2	`~# systemctl daemon-reload` `~# systemctl restart docker`

　　安装cri-dockerd

1 2	`~# 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：安装完cri-dockerd以后，对应服务会自动启动；

　　在各主机上生成kubelet和kubeadm等相关程序包的仓库

~# 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 </etc/apt/sources.list.d/kubernetes.list
deb https://mirrors.aliyun.com/kubernetes/apt/ kubernetes-xenial main
EOF
~# apt update

　　安装kubelet、kubeadm和kubectl

1 2	`~# apt install -y kubelet kubeadm kubectl` `~# systemctl enable kubelet`

　　确认版本

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

1 2	`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文件中添加上如上配置；--network-plugin：指定网络插件规范的类型，这里要使用CNI；--cni-bin-dir：指定CNI插件二进制程序文件的搜索目录；--cni-cache-dir：CNI插件使用的缓存目录；--cni-conf-dir：CNI插件加载配置文件的目录；

　　重启cri-dockerd服务

1	`~# 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：如果没有sysconfig目录，请先创建，然后再创建kubelet文件；这一步就是告诉kubelet cri-dockerd的接口在哪里；该配置不是必须的，我们也可以在初始化集群时在kubeadm命令上使用“--cri-socket unix:///run/cri-dockerd.sock”选项来告诉kubelet cri-dockerd的socket文件路径；

　　初始化第一个master节点

　　列出镜像信息

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的镜像默认是谷歌仓库地址，需要代理才可以正常访问；如果你没有代理，请使用阿里云仓库也是可以的；用--image-repository="registry.aliyuncs.com/google_containers"来指定使用阿里云镜像仓库中的镜像部署k8s集群；

　　下载镜像

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：这里是让我们指定cri-dockerd的socket文件路径；

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集群所需镜像pull到本地；

　　初始化第一个master节点

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：如果要指定仓库地址，请使用--image-repository选项来指定对应仓库；

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：能够看到上诉信息，说明第一个k8s主节点就初始化成功；按照上述提示，完成后续步骤即可；

　　复制配置文件到本地用户家目录，并创建.kube目录

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:~# 

　　部署网络插件

　　下载网络插件calico的部署清单

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集群上应用清单

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:~# 

　　查看节点是否准备就绪？对应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：能够看到master01已经准备就绪，对应pod也都正常running，到此第一个master节点就准备就绪；

　　加入node节点

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：能够看到上述信息表示node节点加入成功；这里需要注意的是，加入node节点，需要指定cri-dockerd的socket文件位置；

　　验证：查看三个节点是否都以正常加入集群？

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              53s   v1.26.3
k8s-node02.ik8s.cc     Ready              11s   v1.26.3
k8s-node03.ik8s.cc     Ready              5s    v1.26.3
root@k8s-master01:~# 

　　提示：可以看到现在有3个node节点，都处于就绪状态；

　　验证：kube-system名称空间下的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名称空间下的pod都running且都是处于就绪状态；至此基于cri-dockerd和docker的单master节点的k8s集群就搭建好了；

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原文地址：https://www.cnblogs.com/qiuhom-1874/p/17279199.html