K8S/Kubernetes

1.添加节点

（master）查看目前节点

[root@k8s-master ~]# kubectl get nodes
NAME         STATUS   ROLES    AGE    VERSION
k8s-master   Ready    master   153m   v1.14.0
k8s-node1    Ready    <none>   117m   v1.14.0
[root@k8s-master ~]# 

clone k8s在执行kubeadm init命令前时的状态机器，修改ip,修改主机名

node2上操作

hostnamectl set-hostname k8s-node2
reboot

添加k8s-node2节点（node2上操作）

[root@k8s-node2 ~]# echo 1 > /proc/sys/net/ipv4/ip_forward
[root@k8s-node2 ~]# kubeadm join 192.168.111.130:6443 --token ymtl8s.933t59qfezi9gjcq     --discovery-token-ca-cert-hash sha256:7816d0b2572e6c569ed8e63ece15a7a08d06ed3fc89698245bf2aaa6acc345d7 
[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] Downloading configuration for the kubelet from the "kubelet-config-1.14" ConfigMap in the kube-system namespace
[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] Activating the kubelet service
[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.

master上查看是否成功添加

[root@k8s-master ~]# kubectl get nodes
NAME         STATUS   ROLES    AGE    VERSION
k8s-master   Ready    master   178m   v1.14.0
k8s-node1    Ready    <none>   142m   v1.14.0
k8s-node2    Ready    <none>   27s    v1.14.0

root@k8s-master ~]# kubectl get po --all-namespaces -o wide ##-o查看pod运行在那个node上，--namespace=kube-system查看系统pod
NAMESPACE     NAME                                 READY   STATUS    RESTARTS   AGE     IP                NODE         NOMINATED NODE   READINESS GATES
kube-system   coredns-fb8b8dccf-ltlx4              1/1     Running   0          3h12m   10.244.0.4        k8s-master   <none>           <none>
kube-system   coredns-fb8b8dccf-q949f              1/1     Running   0          3h12m   10.244.0.5        k8s-master   <none>           <none>
kube-system   etcd-k8s-master                      1/1     Running   2          3h11m   192.168.111.130   k8s-master   <none>           <none>
kube-system   kube-apiserver-k8s-master            1/1     Running   2          3h12m   192.168.111.130   k8s-master   <none>           <none>
kube-system   kube-controller-manager-k8s-master   1/1     Running   2          3h11m   192.168.111.130   k8s-master   <none>           <none>
kube-system   kube-flannel-ds-amd64-2gr2v          1/1     Running   0          177m    192.168.111.130   k8s-master   <none>           <none>
kube-system   kube-flannel-ds-amd64-bsrkx          1/1     Running   0          157m    192.168.111.131   k8s-node1    <none>           <none>
kube-system   kube-flannel-ds-amd64-xdg5p          1/1     Running   0          15m     192.168.111.132   k8s-node2    <none>           <none>
kube-system   kube-proxy-2mj4q                     1/1     Running   0          157m    192.168.111.131   k8s-node1    <none>           <none>
kube-system   kube-proxy-ffd8s                     1/1     Running   0          15m     192.168.111.132   k8s-node2    <none>           <none>
kube-system   kube-proxy-qp5k7                     1/1     Running   0          3h12m   192.168.111.130   k8s-master   <none>           <none>
kube-system   kube-scheduler-k8s-master            1/1     Running   2          3h12m   192.168.111.130   k8s-master   <none>           <none>
[root@k8s-master ~]# 

 

2.删除节点

master上执行

kubectl drain k8s-node2 --delete-local-data --force --ignore-daemonsets
kubectl delete node k8s-node2

node2上执行

kubeadm reset

3.节点重启

无需特别操作，保证节点kubelet是开机启动就行

systemctl enable kubelet

systemctl restart kubelet 或者 service kubelet start