当前配置
centos6 k8s-master1 4g/2c →6c/4g
centos3 k8s-node2 2g/2c →4c/2g
centos4 k8s-node3 4g/2c →4c/2g
计划驱逐node1/node4；并对其他节点增配
当前集群
[root@k8s-master1 ~]# kubectl get pods -o wide --all-namespaces
NAMESPACE NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
kube-system coredns-8554ccb6dd-j88z6 1/1 Running 6 14d 172.30.0.19 k8s-master1 <none> <none>
kube-system coredns-8554ccb6dd-qb7tk 1/1 Running 6 14d 172.30.0.20 k8s-master1 <none> <none>
kube-system etcd-k8s-master1 1/1 Running 6 (29m ago) 14d 192.168.50.27 k8s-master1 <none> <none>
kube-system kube-apiserver-k8s-master1 1/1 Running 27 (19m ago) 14d 192.168.50.27 k8s-master1 <none> <none>
kube-system kube-controller-manager-k8s-master1 1/1 Running 70 14d 192.168.50.27 k8s-master1 <none> <none>
kube-system kube-flannel-ds-42sn7 1/1 Running 7 (18m ago) 14d 192.168.50.213 k8s-node4 <none> <none>
kube-system kube-flannel-ds-5mn77 0/1 Completed 9 14d 192.168.50.135 k8s-node2 <none> <none>
kube-system kube-flannel-ds-fnwvn 1/1 Running 9 (12m ago) 14d 192.168.50.159 k8s-node3 <none> <none>
kube-system kube-flannel-ds-vb6td 1/1 Running 7 14d 192.168.50.27 k8s-master1 <none> <none>
kube-system kube-flannel-ds-z8nlk 1/1 Running 10 14d 192.168.50.217 k8s-node1 <none> <none>
kube-system kube-proxy-f5kph 0/1 ExitCode:0 6 14d 192.168.50.135 k8s-node2 <none> <none>
kube-system kube-proxy-hjmxk 1/1 Running 6 (29m ago) 14d 192.168.50.27 k8s-master1 <none> <none>
kube-system kube-proxy-pxl88 1/1 Running 6 (18m ago) 14d 192.168.50.213 k8s-node4 <none> <none>
kube-system kube-proxy-vx8lh 1/1 Running 6 (20m ago) 14d 192.168.50.217 k8s-node1 <none> <none>
kube-system kube-proxy-xxdr9 1/1 Running 6 (18m ago) 14d 192.168.50.159 k8s-node3 <none> <none>
kube-system kube-scheduler-k8s-master1 1/1 Running 60 (19m ago) 14d 192.168.50.27 k8s-master1 <none> <none>
kube-system metrics-server-5cd4d878d-sg89j 1/1 Running 5 (18m ago) 87m 172.30.4.37 k8s-node4 <none> <none>
kubernetes-dashboard dashboard-metrics-scraper-c45b7869d-6fpc4 1/1 Running 1 (29m ago) 87m 172.30.0.18 k8s-master1 <none> <none>
kubernetes-dashboard kubernetes-dashboard-576cb95f94-g5xjs 1/1 Running 7 (29m ago) 8d 172.30.0.17 k8s-master1 <none> <none>
monitoring alertmanager-main-0 2/2 Running 6 (18m ago) 4h36m 172.30.3.37 k8s-node3 <none> <none>
monitoring alertmanager-main-1 2/2 Running 6 (10m ago) 5h7m 172.30.4.35 k8s-node4 <none> <none>
monitoring alertmanager-main-2 0/2 ContainerCreating 0 24s <none> k8s-node2 <none> <none>
monitoring blackbox-exporter-6798fb5bb4-m4glf 3/3 Running 6 (10m ago) 5h1m 172.30.4.41 k8s-node4 <none> <none>
monitoring grafana-7476b4c65b-49m58 1/1 Running 2 (10m ago) 4h40m 172.30.4.36 k8s-node4 <none> <none>
monitoring kube-state-metrics-74964b6cd4-nsz8k 3/3 Running 6 (12m ago) 87m 172.30.3.33 k8s-node3 <none> <none>
monitoring node-exporter-96tst 2/2 Running 6 (12m ago) 12d 192.168.50.159 k8s-node3 <none> <none>
monitoring node-exporter-hr2hs 2/2 Running 6 (20m ago) 12d 192.168.50.217 k8s-node1 <none> <none>
monitoring node-exporter-q8nxm 0/2 Completed 5 12d 192.168.50.135 k8s-node2 <none> <none>
monitoring node-exporter-qdv5w 2/2 Running 4 (29m ago) 12d 192.168.50.27 k8s-master1 <none> <none>
monitoring node-exporter-qhsrs 2/2 Running 6 (10m ago) 12d 192.168.50.213 k8s-node4 <none> <none>
monitoring prometheus-adapter-5b8db7955f-4l2vr 1/1 Running 2 (18m ago) 87m 172.30.3.34 k8s-node3 <none> <none>
monitoring prometheus-adapter-5b8db7955f-kh9wr 1/1 Running 2 87m 172.30.3.36 k8s-node3 <none> <none>
monitoring prometheus-k8s-0 2/2 Running 4 (12m ago) 4h36m 172.30.3.35 k8s-node3 <none> <none>
monitoring prometheus-k8s-1 2/2 Terminating 0 18m 172.30.1.19 k8s-node1 <none> <none>
monitoring prometheus-operator-75d9b475d9-pnzmm 2/2 Running 4 (10m ago) 5h1m 172.30.4.38 k8s-node4 <none> <none>
weave weave-scope-agent-9ztgn 1/1 Running 4 (18m ago) 12d 192.168.50.213 k8s-node4 <none> <none>
weave weave-scope-agent-d6d5m 1/1 Running 4 12d 192.168.50.159 k8s-node3 <none> <none>
weave weave-scope-agent-ldb8v 1/1 Running 2 12d 192.168.50.27 k8s-master1 <none> <none>
weave weave-scope-agent-pskbz 0/1 ContainerCannotRun 3 (19m ago) 12d 192.168.50.135 k8s-node2 <none> <none>
weave weave-scope-agent-z759n 1/1 Running 3 (20m ago) 12d 192.168.50.217 k8s-node1 <none> <none>
weave weave-scope-app-588b789d4-jwls8 1/1 Running 2 (18m ago) 5h1m 172.30.4.39 k8s-node4 <none> <none>
weave weave-scope-cluster-agent-5d7745c9c9-w8cg6 1/1 Running 2 (18m ago) 87m 172.30.4.40 k8s-node4 <none> <none>
[root@k8s-master1 ~]# kubectl top nodes
NAME CPU(cores) CPU% MEMORY(bytes) MEMORY%
k8s-master1 1309m 65% 1757Mi 48%
k8s-node3 746m 18% 1332Mi 77%
k8s-node4 453m 22% 1111Mi 64%
k8s-node1 <unknown> <unknown> <unknown> <unknown>
k8s-node2 <unknown> <unknown> <unknown> <unknown>
[root@k8s-master1 ~]# kubectl get nodes
NAME STATUS ROLES AGE VERSION
k8s-master1 Ready control-plane,master 14d v1.22.2
k8s-node1 NotReady <none> 14d v1.22.2
k8s-node2 Ready <none> 14d v1.22.2
k8s-node3 Ready <none> 14d v1.22.2
k8s-node4 Ready <none> 14d v1.22.2
驱逐node4
[root@k8s-master1 ~]# kubectl cordon k8s-node4
node/k8s-node4 cordoned
[root@k8s-master1 ~]# kubectl drain k8s-node4 --delete-local-data --force --ignore-daemonsets
Flag --delete-local-data has been deprecated, This option is deprecated and will be deleted. Use --delete-emptydir-data.
node/k8s-node4 already cordoned
WARNING: ignoring DaemonSet-managed Pods: kube-system/kube-flannel-ds-42sn7, kube-system/kube-proxy-pxl88, monitoring/node-exporter-qhsrs, weave/weave-scope-agent-9ztgn
evicting pod weave/weave-scope-cluster-agent-5d7745c9c9-w8cg6
evicting pod kube-system/metrics-server-5cd4d878d-sg89j
evicting pod monitoring/alertmanager-main-1
evicting pod monitoring/blackbox-exporter-6798fb5bb4-m4glf
evicting pod monitoring/grafana-7476b4c65b-49m58
evicting pod monitoring/prometheus-operator-75d9b475d9-pnzmm
evicting pod weave/weave-scope-app-588b789d4-jwls8
error when evicting pods/"alertmanager-main-1" -n "monitoring" (will retry after 5s): Cannot evict pod as it would violate the pod's disruption budget.
evicting pod monitoring/alertmanager-main-1
error when evicting pods/"alertmanager-main-1" -n "monitoring" (will retry after 5s): Cannot evict pod as it would violate the pod's disruption budget.
evicting pod monitoring/alertmanager-main-1
error when evicting pods/"alertmanager-main-1" -n "monitoring" (will retry after 5s): Cannot evict pod as it would violate the pod's disruption budget.
evicting pod monitoring/alertmanager-main-1
error when evicting pods/"alertmanager-main-1" -n "monitoring" (will retry after 5s): Cannot evict pod as it would violate the pod's disruption budget.
evicting pod monitoring/alertmanager-main-1
error when evicting pods/"alertmanager-main-1" -n "monitoring" (will retry after 5s): Cannot evict pod as it would violate the pod's disruption budget.
evicting pod monitoring/alertmanager-main-1
error when evicting pods/"alertmanager-main-1" -n "monitoring" (will retry after 5s): Cannot evict pod as it would violate the pod's disruption budget.
evicting pod monitoring/alertmanager-main-1
error when evicting pods/"alertmanager-main-1" -n "monitoring" (will retry after 5s): Cannot evict pod as it would violate the pod's disruption budget.
pod/metrics-server-5cd4d878d-sg89j evicted
evicting pod monitoring/alertmanager-main-1
pod/prometheus-operator-75d9b475d9-pnzmm evicted
error when evicting pods/"alertmanager-main-1" -n "monitoring" (will retry after 5s): Cannot evict pod as it would violate the pod's disruption budget.
pod/grafana-7476b4c65b-49m58 evicted
evicting pod monitoring/alertmanager-main-1
error when evicting pods/"alertmanager-main-1" -n "monitoring" (will retry after 5s): Cannot evict pod as it would violate the pod's disruption budget.
pod/weave-scope-app-588b789d4-jwls8 evicted
evicting pod monitoring/alertmanager-main-1
error when evicting pods/"alertmanager-main-1" -n "monitoring" (will retry after 5s): Cannot evict pod as it would violate the pod's disruption budget.
pod/blackbox-exporter-6798fb5bb4-m4glf evicted
evicting pod monitoring/alertmanager-main-1
error when evicting pods/"alertmanager-main-1" -n "monitoring" (will retry after 5s): Cannot evict pod as it would violate the pod's disruption budget.
pod/weave-scope-cluster-agent-5d7745c9c9-w8cg6 evicted
evicting pod monitoring/alertmanager-main-1
error when evicting pods/"alertmanager-main-1" -n "monitoring" (will retry after 5s): Cannot evict pod as it would violate the pod's disruption budget.
evicting pod monitoring/alertmanager-main-1
error when evicting pods/"alertmanager-main-1" -n "monitoring" (will retry after 5s): Cannot evict pod as it would violate the pod's disruption budget.
evicting pod monitoring/alertmanager-main-1
error when evicting pods/"alertmanager-main-1" -n "monitoring" (will retry after 5s): Cannot evict pod as it would violate the pod's disruption budget.
evicting pod monitoring/alertmanager-main-1
error when evicting pods/"alertmanager-main-1" -n "monitoring" (will retry after 5s): Cannot evict pod as it would violate the pod's disruption budget.
evicting pod monitoring/alertmanager-main-1
error when evicting pods/"alertmanager-main-1" -n "monitoring" (will retry after 5s): Cannot evict pod as it would violate the pod's disruption budget.
evicting pod monitoring/alertmanager-main-1
error when evicting pods/"alertmanager-main-1" -n "monitoring" (will retry after 5s): Cannot evict pod as it would violate the pod's disruption budget.
evicting pod monitoring/alertmanager-main-1
pod/alertmanager-main-1 evicted
node/k8s-node4 drained
[root@k8s-master1 ~]# kubectl drain k8s-node4 --delete-local-data --force --ignore-daemonsets
Flag --delete-local-data has been deprecated, This option is deprecated and will be deleted. Use --delete-emptydir-data.
node/k8s-node4 already cordoned
WARNING: ignoring DaemonSet-managed Pods: kube-system/kube-flannel-ds-42sn7, kube-system/kube-proxy-pxl88, monitoring/node-exporter-qhsrs, weave/weave-scope-agent-9ztgn
node/k8s-node4 drained
[root@k8s-master1 ~]# kubectl delete node k8s-node4
node "k8s-node4" deleted
[root@k8s-master1 ~]#
[root@k8s-master1 ~]# kubectl get pods -o wide --all-namespaces | grep node4
kube-system kube-flannel-ds-42sn7 1/1 Running 7 (21m ago) 14d 192.168.50.213 k8s-node4 <none> <none>
kube-system kube-proxy-pxl88 1/1 Running 6 (21m ago) 14d 192.168.50.213 k8s-node4 <none> <none>
monitoring node-exporter-qhsrs 2/2 Running 6 (14m ago) 12d 192.168.50.213 k8s-node4 <none> <none>
weave weave-scope-agent-9ztgn 1/1 Running 4 (21m ago) 12d 192.168.50.213 k8s-node4 <none> <none>
[root@k8s-master1 ~]#
驱逐node1（notready状态）
[root@k8s-master1 ~]
NAME STATUS ROLES AGE VERSION
k8s-master1 Ready control-plane,master 14d v1.22.2
k8s-node1 NotReady <none> 14d v1.22.2
k8s-node2 Ready <none> 14d v1.22.2
k8s-node3 Ready <none> 14d v1.22.2
[root@k8s-master1 ~]
node/k8s-node1 cordoned
[root@k8s-master1 ~]
Flag --delete-local-data has been deprecated, This option is deprecated and will be deleted. Use --delete-emptydir-data.
node/k8s-node1 already cordoned
WARNING: ignoring DaemonSet-managed Pods: kube-system/kube-flannel-ds-z8nlk, kube-system/kube-proxy-vx8lh, monitoring/node-exporter-hr2hs, weave/weave-scope-agent-z759n
evicting pod monitoring/prometheus-k8s-1
^C
[root@k8s-master1 ~]
node "k8s-node1" deleted
