kubernetes 常用命令

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https://kubernetes.io/zh/docs/tasks/debug-application-cluster/

Kubernetes help manual

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[root@master ~]# kubectl api-resources
[root@master ~]# kubectl api-versions

查看Kubernetes集群版本信息

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kuberctl version [-o json|yaml] [--short=true|false]
kuberctl cluster-info [dump]
kuberctl config view

Kubernetes cluster status

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[root@master ~]# kubectl get nodes
NAME     STATUS   ROLES    AGE    VERSION
master   Ready    master   169m   v1.18.2
node01   Ready    <none>   168m   v1.18.2
[root@master ~]# kubectl get pod --all-namespaces
NAMESPACE     NAME                             READY   STATUS    RESTARTS   AGE
kube-system   coredns-546565776c-grgtm         1/1     Running   1          168m
kube-system   coredns-546565776c-jf54d         1/1     Running   1          168m
kube-system   etcd-master                      1/1     Running   1          168m
kube-system   kube-apiserver-master            1/1     Running   1          168m
kube-system   kube-controller-manager-master   1/1     Running   1          168m
kube-system   kube-flannel-ds-4jdq9            1/1     Running   1          166m
kube-system   kube-flannel-ds-rqnb2            1/1     Running   1          166m
kube-system   kube-proxy-kv5bl                 1/1     Running   1          168m
kube-system   kube-proxy-znnx6                 1/1     Running   1          167m
kube-system   kube-scheduler-master            1/1     Running   1          168m
[root@master ~]# kubectl get all svc --all-namespaces
error: you must specify only one resource
[root@master ~]# kubectl get svc --all-namespaces
NAMESPACE     NAME         TYPE        CLUSTER-IP   EXTERNAL-IP   PORT(S)                  AGE
default       kubernetes   ClusterIP   10.96.0.1    <none>        443/TCP                  168m
kube-system   kube-dns     ClusterIP   10.96.0.10   <none>        53/UDP,53/TCP,9153/TCP   168m
[root@master ~]# kubectl get cs
NAME                 STATUS    MESSAGE             ERROR
controller-manager   Healthy   ok
scheduler            Healthy   ok
etcd-0               Healthy   {"health":"true"}

kubectl create

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//创建服务
[root@localhost]# kubectl create -f xx_service.yaml --record
[root@localhost]# kubectl get svc | grep xx_service_name
[root@localhost]# kubectl describe svc/service_name

//查看服务的内部dns地址
[root@localhost]# kubectl run -i --tty busybox --image=busybox --restart=Never
/# nslookup service_name

//通过deployment控制器建立pod
[root@Localhost]# kubectl create -f xx_depolyment.yaml --record=true

//查看已创建的deployment
[root@localhost]# kubectl get deploments

//查看有哪些pod
[root@localhost]# kubectl get pods| grep xx_service

//查看pod日志
[root@localhost]# kubectl logs -f pod_name

//服务伸缩
[root@localhost]# vi xx_deployment.yaml
[root@localhost]# kubectl apply -f xx_deployment.yaml

//服务升级
[root@localhost]# vi xx_deployment.yaml
[root@localhost]# kubectl apply -f xx_deployment.yaml

//监视升级过程
[root@localhost]# kubectl rollout status deployment/deployment_name

//服务回退
[root@localhost]# kubectl rollout undo deployments/deployment_name

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