kubectl命令集合
- get查看一个或多个资源
[root@k8s-master1 ~]# kubectl get pod NAME READY STATUS RESTARTS AGE busybox 1/1 Running 21 21h http-797d8dcbc7-88czq 1/1 Running 1 21h http-797d8dcbc7-ktkmn 1/1 Running 1 21h http-797d8dcbc7-l8kbw 1/1 Running 1 21h web-d86c95cc9-csf8n 1/1 Running 1 21h [root@k8s-master1 ~]# kubectl get node NAME STATUS ROLES AGE VERSION k8s-node1 Ready <none> 25h v1.16.0 k8s-node2 Ready <none> 25h v1.16.0
- get查看当前所有的资源
[root@k8s-master1 ~]# kubectl get all NAME READY STATUS RESTARTS AGE pod/busybox 1/1 Running 21 21h pod/http-797d8dcbc7-88czq 1/1 Running 1 21h pod/http-797d8dcbc7-ktkmn 1/1 Running 1 21h pod/http-797d8dcbc7-l8kbw 1/1 Running 1 21h pod/web-d86c95cc9-csf8n 1/1 Running 1 22h NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE service/http NodePort 10.0.0.164 <none> 90:32738/TCP 21h service/kubernetes ClusterIP 10.0.0.1 <none> 443/TCP 26h service/web NodePort 10.0.0.197 <none> 80:30484/TCP 22h NAME READY UP-TO-DATE AVAILABLE AGE deployment.apps/http 3/3 3 3 21h deployment.apps/web 1/1 1 1 22h NAME DESIRED CURRENT READY AGE replicaset.apps/http-797d8dcbc7 3 3 3 21h replicaset.apps/web-d86c95cc9 1 1 1 22h
- get查看当前所有资源更详细的信息
[root@k8s-master1 ~]# kubectl get all -o wide NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES pod/busybox 1/1 Running 21 21h 10.244.1.13 k8s-node2 <none> <none> pod/http-797d8dcbc7-88czq 1/1 Running 1 21h 10.244.1.10 k8s-node2 <none> <none> pod/http-797d8dcbc7-ktkmn 1/1 Running 1 21h 10.244.0.5 k8s-node1 <none> <none> pod/http-797d8dcbc7-l8kbw 1/1 Running 1 21h 10.244.1.12 k8s-node2 <none> <none> pod/web-d86c95cc9-csf8n 1/1 Running 1 22h 10.244.0.7 k8s-node1 <none> <none> NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE SELECTOR service/http NodePort 10.0.0.164 <none> 90:32738/TCP 21h app=http service/kubernetes ClusterIP 10.0.0.1 <none> 443/TCP 26h <none> service/web NodePort 10.0.0.197 <none> 80:30484/TCP 22h app=web NAME READY UP-TO-DATE AVAILABLE AGE CONTAINERS IMAGES SELECTOR deployment.apps/http 3/3 3 3 21h httpd httpd app=http deployment.apps/web 1/1 1 1 22h nginx nginx app=web NAME DESIRED CURRENT READY AGE CONTAINERS IMAGES SELECTOR replicaset.apps/http-797d8dcbc7 3 3 3 21h httpd httpd app=http,pod-template-hash=797d8dcbc7 replicaset.apps/web-d86c95cc9 1 1 1 22h nginx nginx app=web,pod-template-hash=d86c95cc9
- 查看pod更详细的信息
[root@k8s-master1 ~]# kubectl get pod -o wide NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES busybox 1/1 Running 21 21h 10.244.1.13 k8s-node2 <none> <none> http-797d8dcbc7-88czq 1/1 Running 1 21h 10.244.1.10 k8s-node2 <none> <none> http-797d8dcbc7-ktkmn 1/1 Running 1 21h 10.244.0.5 k8s-node1 <none> <none> http-797d8dcbc7-l8kbw 1/1 Running 1 21h 10.244.1.12 k8s-node2 <none> <none> web-d86c95cc9-csf8n 1/1 Running 1 22h 10.244.0.7 k8s-node1 <none> <none>
- 查看不同命名空间的pod详细信息
[root@k8s-master1 ~]# kubectl get pod -o wide -n kube-system NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES coredns-65567c7b57-sskls 1/1 Running 1 21h 10.244.1.11 k8s-node2 <none> <none> kube-flannel-ds-amd64-96v9n 1/1 Running 1 22h 10.10.0.246 k8s-node2 <none> <none> kube-flannel-ds-amd64-nbx8g 1/1 Running 1 22h 10.10.0.245 k8s-node1 <none> <none>
创建pod
- 指定副本数和nginx版本以及端口
[root@k8s-master1 ~]# kubectl run nginx --replicas=3 --image=nginx:1.14 --port=80 kubectl run --generator=deployment/apps.v1 is DEPRECATED and will be removed in a future version. Use kubectl run --generator=run-pod/v1 or kubectl create instead. deployment.apps/nginx created
- 查看pod
[root@k8s-master1 ~]# kubectl get deploy,pods NAME READY UP-TO-DATE AVAILABLE AGE deployment.apps/nginx 3/3 3 3 72s NAME READY STATUS RESTARTS AGE pod/busybox 1/1 Running 23 22h pod/nginx-59d795d786-2bkqp 1/1 Running 0 72s pod/nginx-59d795d786-bnn9r 1/1 Running 0 72s pod/nginx-59d795d786-xlps4 1/1 Running 0 72s
- 暴露端口
[root@k8s-master1 ~]# kubectl expose deployment nginx --port=80 --type=NodePort --target-port=80 --name=nginx-service service/nginx-service exposed
- 查看service
[root@k8s-master1 ~]# kubectl get service NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE http NodePort 10.0.0.164 <none> 90:32738/TCP 22h kubernetes ClusterIP 10.0.0.1 <none> 443/TCP 27h nginx-service NodePort 10.0.0.230 <none> 80:31299/TCP 34s web NodePort 10.0.0.197 <none> 80:30484/TCP 23h
- 任意一个node节点做测试
[root@k8s-master1 ~]# curl 10.10.0.245:31299
<!DOCTYPE html>
<html>
<head>
<title>Welcome to nginx!</title>
<style>
body {
width: 35em;
margin: 0 auto;
font-family: Tahoma, Verdana, Arial, sans-serif;
}
</style>
</head>
<body>
<h1>Welcome to nginx!</h1>
<p>If you see this page, the nginx web server is successfully installed and
working. Further configuration is required.</p>
<p>For online documentation and support please refer to
<a href="http://nginx.org/">nginx.org</a>.<br/>
Commercial support is available at
<a href="http://nginx.com/">nginx.com</a>.</p>
<p><em>Thank you for using nginx.</em></p>
</body>
</html>
- 更新版本
[root@k8s-master1 ~]# kubectl set image deployment/nginx nginx=nginx:1.15 deployment.apps/nginx image updated
- 查看是否更新到了最新版本
[root@k8s-master1 ~]# kubectl get pods
NAME READY STATUS RESTARTS AGE
busybox 1/1 Running 23 22h
nginx-dc5dc5865-grwbx 1/1 Running 0 87s
nginx-dc5dc5865-gzmdv 1/1 Running 0 119s
nginx-dc5dc5865-jrrkb 1/1 Running 0 110s
[root@k8s-master1 ~]# kubectl logs nginx-dc5dc5865-grwbx
[root@k8s-master1 ~]# kubectl describe pod nginx-dc5dc5865-jrrkb
Name: nginx-dc5dc5865-jrrkb
Namespace: default
Priority: 0
Node: k8s-node2/10.10.0.246
Start Time: Sat, 30 May 2020 14:48:44 +0800
Labels: pod-template-hash=dc5dc5865
run=nginx
Annotations: <none>
Status: Running
IP: 10.244.1.21
IPs:
IP: 10.244.1.21
Controlled By: ReplicaSet/nginx-dc5dc5865
Containers:
nginx:
Container ID: docker://4980776c80258e4c98b88663680bf6fd6b816225b814ab6a2c146c5e380e32f6
Image: nginx:1.15
回滚
- 查看发版的历史版本
[root@k8s-master1 ~]# kubectl rollout history deployment/nginx deployment.apps/nginx REVISION CHANGE-CAUSE 1 <none> 2 <none>
- 回滚到上一个版本
[root@k8s-master1 ~]# kubectl rollout undo deployment/nginx deployment.apps/nginx rolled back
删除pod
- 删除service
[root@k8s-master1 ~]# kubectl get service NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE http NodePort 10.0.0.164 <none> 90:32738/TCP 23h kubernetes ClusterIP 10.0.0.1 <none> 443/TCP 27h web NodePort 10.0.0.197 <none> 80:30484/TCP 23h [root@k8s-master1 ~]# kubectl delete svc/web service "web" deleted [root@k8s-master1 ~]# kubectl delete svc/http service "http" deleted [root@k8s-master1 ~]# kubectl get service NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE kubernetes ClusterIP 10.0.0.1 <none> 443/TCP 27h
- 查询pod
[root@k8s-master1 ~]# kubectl get deploy,pods NAME READY UP-TO-DATE AVAILABLE AGE deployment.apps/http 3/3 3 3 21h deployment.apps/web 1/1 1 1 22h NAME READY STATUS RESTARTS AGE pod/busybox 1/1 Running 21 21h pod/http-797d8dcbc7-88czq 1/1 Running 1 21h pod/http-797d8dcbc7-ktkmn 1/1 Running 1 21h pod/http-797d8dcbc7-l8kbw 1/1 Running 1 21h pod/web-d86c95cc9-csf8n 1/1 Running 1 22h
- 删除
[root@k8s-master1 ~]# kubectl delete deployment.apps/http deployment.apps "http" deleted [root@k8s-master1 ~]# kubectl delete deployment.apps/web deployment.apps "web" deleted
- 验证
[root@k8s-master1 ~]# kubectl get deploy,pods NAME READY STATUS RESTARTS AGE pod/busybox 1/1 Running 21 21h
查看节点详细信息
[root@iZ2zei14p015t8wkktdhn2Z tools]# kubectl get nodes -o wide NAME STATUS ROLES AGE VERSION INTERNAL-IP EXTERNAL-IP OS-IMAGE KERNEL-VERSION CONTAINER-RUNTIME iz2zei14p015t8wkktdhn1z Ready <none> 18h v1.15.0 10.0.0.63 <none> CentOS Linux 7 (Core) 3.10.0-1062.18.1.el7.x86_64 docker://18.6.1 iz2zei14p015t8wkktdhn2z Ready master 18h v1.15.0 10.0.0.61 <none> CentOS Linux 7 (Core) 3.10.0-1062.18.1.el7.x86_64 docker://18.6.1 iz2zei14p015t8wkktdhn3z Ready <none> 18h v1.15.0 10.0.0.62 <none> CentOS Linux 7 (Core) 3.10.0-1062.18.1.el7.x86_64 docker://18.6.1
查看node状态
[root@iZ2zei14p015t8wkktdhn2Z ~]# kubectl get node NAME STATUS ROLES AGE VERSION iz2zei14p015t8wkktdhn1z Ready <none> 18h v1.15.0 iz2zei14p015t8wkktdhn2z Ready master 18h v1.15.0 iz2zei14p015t8wkktdhn3z Ready <none> 18h v1.15.0
查看集群信息
[root@iZ2zei14p015t8wkktdhn2Z tools]# kubectl cluster-info Kubernetes master is running at https://10.0.0.61:6443 KubeDNS is running at https://10.0.0.61:6443/api/v1/namespaces/kube-system/services/kube-dns:dns/proxy To further debug and diagnose cluster problems, use 'kubectl cluster-info dump'.
查看所有命名空间下的pod
[root@k8s-master ~]# kubectl get pods --all-namespaces NAMESPACE NAME READY STATUS RESTARTS AGEdefault nginx-f89759699-79kpb 1/1 Running 1 13m default nginx-f89759699-cg2xw 1/1 Running 1 10mdefault nginx-f89759699-fg2qt 1/1 Running 1 10m kube-system coredns-7ff77c879f-28cbh 1/1 Running 1 36mkube-system coredns-7ff77c879f-pg6hn 1/1 Running 1 36m kube-system etcd-k8s-master 1/1 Running 1 37mkube-system kube-apiserver-k8s-master 1/1 Running 1 37m kube-system kube-controller-manager-k8s-master 1/1 Running 1 37mkube-system kube-flannel-ds-amd64-ntjbj 1/1 Running 2 23m kube-system kube-flannel-ds-amd64-nvw8x 1/1 Running 1 33mkube-system kube-flannel-ds-amd64-vjb6h 1/1 Running 1 26m kube-system kube-proxy-6p98l 1/1 Running 1 23mkube-system kube-proxy-9v2hl 1/1 Running 1 26m kube-system kube-proxy-xljd6 1/1 Running 1 36mkube-system kube-scheduler-k8s-master 1/1 Running 1 37m
查看运行的pod的详细信息
[root@k8s-master ~]# kubectl get pods --all-namespaces -o wideNAMESPACE NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES default nginx-f89759699-79kpb 1/1 Running 1 15m 10.244.2.3 k8s-node2 <none> <none>default nginx-f89759699-cg2xw 1/1 Running 1 12m 10.244.1.5 k8s-node1 <none> <none> default nginx-f89759699-fg2qt 1/1 Running 1 12m 10.244.1.4 k8s-node1 <none> <none>kube-system coredns-7ff77c879f-28cbh 1/1 Running 1 39m 10.244.0.6 k8s-master <none> <none> kube-system coredns-7ff77c879f-pg6hn 1/1 Running 1 39m 10.244.0.5 k8s-master <none> <none>kube-system etcd-k8s-master 1/1 Running 1 39m 10.10.0.244 k8s-master <none> <none> kube-system kube-apiserver-k8s-master 1/1 Running 1 39m 10.10.0.244 k8s-master <none> <none>kube-system kube-controller-manager-k8s-master 1/1 Running 1 39m 10.10.0.244 k8s-master <none> <none> kube-system kube-flannel-ds-amd64-ntjbj 1/1 Running 2 25m 10.10.0.246 k8s-node2 <none> <none>kube-system kube-flannel-ds-amd64-nvw8x 1/1 Running 1 36m 10.10.0.244 k8s-master <none> <none> kube-system kube-flannel-ds-amd64-vjb6h 1/1 Running 1 28m 10.10.0.245 k8s-node1 <none> <none> kube-system kube-proxy-6p98l 1/1 Running 1 25m 10.10.0.246 k8s-node2 <none> <none> kube-system kube-proxy-9v2hl 1/1 Running 1 28m 10.10.0.245 k8s-node1 <none> <none> kube-system kube-proxy-xljd6 1/1 Running 1 39m 10.10.0.244 k8s-master <none> <none> kube-system kube-scheduler-k8s-master 1/1 Running 1 39m 10.10.0.244 k8s-master <none> <none>
- 查看pod的详细信息
[root@iZ2zei14p015t8wkktdhn2Z ~]# kubectl describe pod nginx-554b9c67f9-2xcpx
Name: nginx-554b9c67f9-2xcpx
Namespace: default
Priority: 0
Node: iz2zei14p015t8wkktdhn3z/10.0.0.62
Start Time: Tue, 12 May 2020 17:48:50 +0800
Labels: app=nginx
pod-template-hash=554b9c67f9
Annotations: <none>
Status: Running
IP: 10.244.1.10
Controlled By: ReplicaSet/nginx-554b9c67f9
Containers:
nginx:
Container ID: docker://19e25802c1a34a940f92c36456a6daba1a2ea81b6d6d3461c0565cc11eca3565
Image: nginx
Image ID: docker-pullable://nginx@sha256:86ae264c3f4acb99b2dee4d0098c40cb8c46dcf9e1148f05d3a51c4df6758c12
Port: <none>
Host Port: <none>
State: Running
Started: Wed, 13 May 2020 09:59:27 +0800
Last State: Terminated
Reason: Completed
Exit Code: 0
Started: Tue, 12 May 2020 18:50:46 +0800
Finished: Tue, 12 May 2020 18:54:46 +0800
Ready: True
Restart Count: 2
Environment: <none>
Mounts:
/var/run/secrets/kubernetes.io/serviceaccount from default-token-txbwt (ro)
Conditions:
Type Status
Initialized True
Ready True
ContainersReady True
PodScheduled True
Volumes:
default-token-txbwt:
Type: Secret (a volume populated by a Secret)
SecretName: default-token-txbwt
Optional: false
QoS Class: BestEffort
Node-Selectors: <none>
Tolerations: node.kubernetes.io/not-ready:NoExecute for 300s
node.kubernetes.io/unreachable:NoExecute for 300s
Events:
Type Reason Age From Message
---- ------ ---- ---- -------
Normal Scheduled 18h default-scheduler Successfully assigned default/nginx-554b9c67f9-2xcpx to iz2zei14p015t8wkktdhn3z
Normal Pulling 18h kubelet, iz2zei14p015t8wkktdhn3z Pulling image "nginx"
Normal Pulled 18h kubelet, iz2zei14p015t8wkktdhn3z Successfully pulled image "nginx"
Normal Created 18h kubelet, iz2zei14p015t8wkktdhn3z Created container nginx
Normal Started 18h kubelet, iz2zei14p015t8wkktdhn3z Started container nginx
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