pod 迁移

一、查看节点上的pod

root@master:/usr/local/bin# kubectl get pod -o wide
NAME                             READY   STATUS    RESTARTS   AGE   IP            NODE    NOMINATED NODE   READINESS GATES
busybox-master-cf9989dc9-bbsdr   1/1     Running   0          28h   10.244.2.6    node1   <none>           <none>
busybox-master-cf9989dc9-v98bp   1/1     Running   0          25h   10.244.2.10   node1   <none>           <none>
busybox-master-cf9989dc9-wczpm   1/1     Running   0          28h   10.244.2.7    node1   <none>           <none>
nginx-master-fbc95f85-g27fm      1/1     Running   0          9h    10.244.2.21   node1   <none>           <none>
nginx-master-fbc95f85-qg42w      1/1     Running   0          9h    10.244.2.19   node1   <none>           <none>
nginx-master-fbc95f85-qpxqn      1/1     Running   0          9h    10.244.2.20   node1   <none>           <none>
ssh-server-66d95b8bd4-zp69j      1/1     Running   0          25h   10.244.2.9    node1   <none>           <none>

二、标记节点不可用

root@master:/usr/local/bin# kubectl cordon node1
node/node1 cordoned

三、查看节点状态

root@master:/usr/local/bin# kubectl get node
NAME     STATUS                     ROLES    AGE     VERSION
master   Ready                      master   6d23h   v1.19.13
node     Ready                      <none>   6d10h   v1.19.13
node1    Ready,SchedulingDisabled   <none>   2d8h    v1.19.13

四、查看pod状态

root@master:/usr/local/bin# kubectl get pod -o wide
NAME                             READY   STATUS    RESTARTS   AGE   IP            NODE    NOMINATED NODE   READINESS GATES
nginx-master-fbc95f85-g27fm      1/1     Running   0          9h    10.244.2.21   node1   <none>           <none>
nginx-master-fbc95f85-qg42w      1/1     Running   0          9h    10.244.2.19   node1   <none>           <none>
nginx-master-fbc95f85-qpxqn      1/1     Running   0          9h    10.244.2.20   node1   <none>           <none>

五、驱赶pod

root@master:/usr/local/bin# kubectl drain node1 --delete-local-data --ignore-daemonsets --force
node/node1 already cordoned
WARNING: ignoring DaemonSet-managed Pods: kube-system/kube-flannel-ds-kvc6x, kube-system/kube-proxy-8znjq, venus-defender/defender-8knnd
evicting pod kube-system/coredns-f9fd979d6-bb5hf
evicting pod default/nginx-master-fbc95f85-qg42w
evicting pod default/ssh-server-66d95b8bd4-zp69j
evicting pod default/busybox-master-cf9989dc9-bbsdr
evicting pod default/nginx-master-fbc95f85-qpxqn
evicting pod default/busybox-master-cf9989dc9-wczpm
evicting pod default/busybox-master-cf9989dc9-v98bp
evicting pod default/nginx-master-fbc95f85-g27fm
pod/coredns-f9fd979d6-bb5hf evicted
pod/nginx-master-fbc95f85-g27fm evicted
pod/nginx-master-fbc95f85-qpxqn evicted
I0819 19:32:46.073806  932974 request.go:645] Throttling request took 1.149915211s, request: GET:https://192.168.33.15:6443/api/v1/namespaces/default/pods/busybox-master-cf9989dc9-v98bp
pod/ssh-server-66d95b8bd4-zp69j evicted
pod/nginx-master-fbc95f85-qg42w evicted
pod/busybox-master-cf9989dc9-wczpm evicted
pod/busybox-master-cf9989dc9-v98bp evicted
pod/busybox-master-cf9989dc9-bbsdr evicted
node/node1 evicted

六、查看pod状态

root@master:~# kubectl get pod -o wide
nginx-master-fbc95f85-kqdnv      1/1     Running            0          4m8s   10.244.1.153   node   <none>           <none>
nginx-master-fbc95f85-nnzhp      1/1     Running            0          4m8s   10.244.1.149   node   <none>           <none>
nginx-master-fbc95f85-vvwgn      1/1     Running            0          4m8s   10.244.1.150   node   <none>           <none>

七、取消标记

root@master:/k8s/pod# kubectl uncordon node1
node/node1 uncordoned

八、查看节点状态

root@master:/k8s/pod# kubectl get node
NAME     STATUS   ROLES    AGE     VERSION
master   Ready    master   6d23h   v1.19.13
node     Ready    <none>   6d10h   v1.19.13
node1    Ready    <none>   2d8h    v1.19.13