6、 Deploying k8s cluster

cuiyongchao007 2021-01-20 23:44:38
deploying k8s cluster

6、 ... and 、 Deploy k8s Cluster( Next )

​ Last time we [ adopt kubeadm stay k8s-master The upper part has been deployed. Kubernetes, Installation in this section Pod Network and add k8s-node1 and k8s-node2, Complete the cluster deployment .

( One ) install Pod The Internet

​ Must let Kubernetes Cluster Able to work , Must install Pod The Internet , otherwise Pod No communication between .Kubernetes Support multiple network solutions , Here we use flannel, It will be discussed later Canal.

​ Execute the following command to deploy flannel:

root@cuiyongchao:~# kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml
podsecuritypolicy.policy/psp.flannel.unprivileged created
clusterrole.rbac.authorization.k8s.io/flannel created
clusterrolebinding.rbac.authorization.k8s.io/flannel created
serviceaccount/flannel created
configmap/kube-flannel-cfg created
daemonset.apps/kube-flannel-ds created

( Two ) add to k8s-node1 and k8s-node2

stay k8s-node1 and k8s-node2 Execute the following command respectively , Register it to Cluster in :

 close swap:
swapoff -a
sed -ri 's/.*swap.*/#&/' /etc/fstab
kubeadm join --token wjxawc.qsjz0lp4m9ihdcy0 --discovery-token-unsafe-skip-ca-verification

there --token From the front kubeadm init The output of the ⑨ Step tips , If it wasn't recorded, it would have passed kubeadm token list see .

root@k8s-master:~# kubeadm token list
0872ga.bg0rbp0jvp2omjem 23h 2020-11-02T11:22:37Z authentication,signing The default bootstrap token generated by 'kubeadm init'. system:bootstrappers:kubeadm:default-node-token

kubeadm join  The implementation is as follows :

root@k8s-node-02:~# kubeadm join --token 0872ga.bg0rbp0jvp2omjem --discovery-token-unsafe-skip-ca-verification
[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 -oyaml'
[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.

According to the prompt , We can go through  kubectl get nodes  Check the status of the node .

root@k8s-master:~# kubectl get nodes
k8s-master Ready master 17m v1.19.3
k8s-node-01 Ready <none> 76s v1.19.3
k8s-node-02 Ready <none> 94s v1.19.3

At present, all nodes are NotReady, This is because each node needs to start several components , These components are all in Pod Run in , You need to start with google Download mirroring , We can check it by the following command Pod The state of :

root@k8s-master:~# kubectl get pod --all-namespaces
kube-system coredns-6d56c8448f-9grxk 1/1 Running 0 17m
kube-system coredns-6d56c8448f-mrx55 1/1 Running 0 17m
kube-system etcd-k8s-master 1/1 Running 0 17m
kube-system kube-apiserver-k8s-master 1/1 Running 0 17m
kube-system kube-controller-manager-k8s-master 1/1 Running 0 17m
kube-system kube-flannel-ds-cqwqv 1/1 Running 0 12m
kube-system kube-flannel-ds-nh2qg 1/1 Running 0 104s
kube-system kube-flannel-ds-wbrs6 1/1 Running 0 86s
kube-system kube-proxy-45prh 1/1 Running 0 17m
kube-system kube-proxy-g2c4x 1/1 Running 0 104s
kube-system kube-proxy-jwvg5 1/1 Running 0 86s
kube-system kube-scheduler-k8s-master 1/1 Running 0 17m

PendingContainerCreatingImagePullBackOff  All show Pod Not ready ,Running  It's the ready state . We can go through  kubectl describe pod <Pod Name>  see Pod Details , such as :

​ To save space , Only the last part of the command output is intercepted here , You can see in the download image When the failure , If the network quality is not good , This is very common . We can be patient , because Kubernetes Will try again , We can also do it by ourselves docker pull To download this image .

Wait for a while ,image After all successful downloads , all Pod Will be Running state .

​ At this time , All nodes have been  Ready,Kubernetes Cluster Create success , Everything is all set. .


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