k8s common commands

K8S command
http://kubernetes.io/docs/user-guide/kubectl-overview/

//List PODs
[root@localhost vCN]# kubectl get pods


//List replicated replicas
[root@localhost vCN]# kubectl get replicationcontroller



//List replicas
[root@localhost vCN]# kubectl get rc


//List the description of POD, here you can see the correspondence with docker
[root@localhost vCN]# kubectl describe pod cnsend


//services is The outermost unit of Kubernetes
can access our defined Pod resources through a virtual access IP and service port. The current version is implemented through nat forwarding of iptables. The forwarded target port is a random port generated by Kube_proxy
//listed service
[root@localhost vCN]# kubectl get svc
NAME LABELS SELECTOR IP(S) PORT(S)
as-service-nodeport   <none>                                    name=as       10.254.38.46    4000/TCP
cnquery               app=cnquery                               app=cnquery   10.254.42.29    8080/TCP
cnreceiver            app=cnreceiver                            app=cnrcv     10.254.183.55   10010/TCP
kubernetes            component=apiserver,provider=kubernetes   <none>        10.254.0.1      443/TCP
msb-rc                name=msb-rc                               name=msb-rc   10.254.81.154   10080/TCP
mysql                 app=mysql                                 app=mysql     10.254.100.45   32768/TCP


//获取服务的描述
[root@localhost ~]# kubectl describe service fmadapter-sv-np


kubectl describe pod fm-adapter-controller-r9yb9
kubectl describe service fmadapter-sv-np

//Create and delete services
kubectl create -f mysql-controller.json
kubectl delete -f mysql-controller.json

//Run the command
kubectl in the container exec cnsend-kg0es env

//Print the log of the container in the POD
kubectl logs busybox -c busybox1


//The association between rc and pod
kubectl describe pod 30166149-810b-4f4b-8a21-0ae4a4c0bcdf-1-6q0ur --namespace="xxx "
ubuntu@default-np234:~$ kubectl describe pod 30166149-810b-4f4b-8a21-0ae4a4c0bcdf-1-6q0ur --namespace="xxx"

via Labels:

// get rc
kubectl get rc --namespace=xxx -o wide
NAME DESIRED CURRENT AGE CONTAINER(S) IMAGE(S) SELECTOR

The value of SELECTOR is the same as the previous labels.

//delete pod
kubectl delete rc xxxxxxx --namespace=xxx



//k8s RESTFUL interface
http://10.43.39.11:8080/api/v1/namespaces/default/replicationcontrollers
http://10.43.39.11:8080/api/v1 /namespaces/default/replicationcontrollers/fm-adapter-controller


http://10.43.39.11:8080/api/v1/namespaces/default/pods
http://10.43.39.11:8080/api/v1/namespaces/default/pods /fm-adapter-controller-7porr

http://10.43.39.11:8080/api/v1/nodes
http://10.43.39.11:8080/api/v1/nodes/10.43.39.12

http://10.43.39.11: 8080/api/v1/pods
http://10.43.39.11:8080/api/v1/replicationcontrollers
http://10.43.39.11:8080/api/v1/services