查：
[root@k8s-host1 liang]# kubectl get nodes --show-labels NAME STATUS ROLES AGE VERSION LABELS k8s-host1 Ready master 173d v1.16.2 beta.kubernetes.io/arch=amd64,beta.kubernetes.io/os=linux,edgenode=true,ingress=yes,kubernetes.io/arch=amd64,kubernetes.io/hostname=k8s-host1,kubernetes.io/os=linux,node-role.kubernetes.io/master= k8s-host2 Ready master 173d v1.16.2 beta.kubernetes.io/arch=amd64,beta.kubernetes.io/os=linux,kubernetes.io/arch=amd64,kubernetes.io/hostname=k8s-host2,kubernetes.io/os=linux,node-role.kubernetes.io/master= k8s-host3 Ready master 173d v1.16.2 beta.kubernetes.io/arch=amd64,beta.kubernetes.io/os=linux,kubernetes.io/arch=amd64,kubernetes.io/hostname=k8s-host3,kubernetes.io/os=linux,node-role.kubernetes.io/master=
增：
# 語法 kubectl label nodes <node-name> <label-key>=<label-value> #給k8s-host1添加一個標簽device為ssd [root@k8s-host1 liang]# kubectl label nodes k8s-host1 device=ssd node/k8s-host1 labeled
改：
#語法: 需要加上--overwrite參數：
kubectl label nodes <node-name> <label-key>=<label-value> --overwrite
[root@k8s-host1 liang]# kubectl label nodes k8s-host1 device=liang --overwrite
node/k8s-host1 labeled
#查看修改：
[root@k8s-host1 liang]# kubectl get nodes k8s-host1 --show-labels
NAME STATUS ROLES AGE VERSION LABELS
k8s-host1 Ready master 173d v1.16.2 beta.kubernetes.io/arch=amd64,beta.kubernetes.io/os=linux,device=liang,edgenode=true,ingress=yes,kubernetes.io/arch=amd64,kubernetes.io/hostname=k8s-host1,kubernetes.io/os=linux,node-role.kubernetes.io/master=
刪：
# 語法 kubectl label nodes <node-name> <label-key>- [root@k8s-host1 liang]# kubectl label nodes k8s-host1 device- node/k8s-host1 labeled #查看刪除： [root@k8s-host1 liang]# kubectl get nodes k8s-host1 --show-labels NAME STATUS ROLES AGE VERSION LABELS k8s-host1 Ready master 173d v1.16.2 beta.kubernetes.io/arch=amd64,beta.kubernetes.io/os=linux,edgenode=true,ingress=yes,kubernetes.io/arch=amd64,kubernetes.io/hostname=k8s-host1,kubernetes.io/os=linux,node-role.kubernetes.io/master=
Pod選擇label
# 添加nodeSelector選項用來選擇對應的node
apiVersion: v1
kind: Pod
metadata:
name: nginx
labels:
env: test
spec:
containers:
- name: nginx
image: nginx
imagePullPolicy: IfNotPresent
nodeSelector:
device: ssd