设置kubectl命令补齐

yum -y install bash-completion
touch /etc/profile.d/kubectl-bash.sh
echo "source <(kubectl completion bash)" > kubectl-bash.sh
source /etc/profile

获取集群节点信息

[root@k8s-master pods]# kubectl get nodes 
NAME         STATUS   ROLES    AGE     VERSION
k8s-master   Ready    master   5d21h   v1.16.0
k8s-node1    Ready    worker   5d21h   v1.16.0
k8s-node2    Ready    worker   5d21h   v1.16.0

设置输出不同的格式

kubectl get nodes -o wide   (比kubectl get nodes得到更为详细的信息)
kubectl get nodes -o json    (得到json格式的数据)
kubectl get nodes -o yaml   (得到yaml格式的数据)

获得、修改节点标签

kubectl get nodes --show-labels
NAME         STATUS   ROLES    AGE     VERSION   LABELS
k8s-master   Ready    master   5d21h   v1.16.0   beta.kubernetes.io/arch=amd64,beta.kubernetes.io/os=linux,kubernetes.io/arch=amd64,kubernetes.io/hostname=k8s-master,kubernetes.io/os=linux,node-role.kubernetes.io/master=

添加节点标签

kubectl lable nodes k8s-node1 disktype=ssd

删除节点标签

kubectl label nodes k8s-node2 disktype-

修改节点的roles

kubectl label nodes k8s-node2 node-role.kubernetes.io/worker=
#修改名字为worker

namespace

[root@k8s-master pods]# kubectl get namespaces 
NAME              STATUS   AGE
default           Active   6d2h
kube-node-lease   Active   6d2h
kube-public       Active   6d2h
kube-system       Active   6d2h
nginx-ingress     Active   6d1h
#查看所有的命名空间

kubectl create namespace demo
#创建命名空间

kubectl delete namespace demo
#删除命名空间

创建属于不同命名空间的pod

vim nginx-namespace.yaml

apiVersion: v1
kind: Pod
metadata:
  name: nginx
  namespace: demo
spec:
  containers:
  - name: nginx
    image: nginx
    ports:
    - containerPort: 80
#前提是已经创建了相应的namespace

查看不同namespace的pod

kubectl get pod --namespace demo

创建context

kubectl config set-context demo --user=rourou --cluster=rourou --namespace=demo

##查看context
kubectl config get-contexts