1.增加节点标签 备注 =：代表增加标签

kubectl label nodes node3 node-role.kubernetes.io/node3= 

2.减少节点标签 备注 -：代表减少标签

kubectl label nodes node3 node-role.kubernetes.io/node3- 

 

 

在某些特殊情况下，需要将某些服务固定在一台宿主机上, k8s可以使用label给node节点打上标签来满足这种需求.

Label添加删除和修改

添加label

# 语法
kubectl label nodes <node-name> <label-key>=<label-value> 

# 查看现有node及label [root@master ~]# kubectl get nodes --show-labels NAME STATUS ROLES AGE VERSION LABELS master Ready master 54d v1.13.4 beta.kubernetes.io/arch=amd64,beta.kubernetes.io/os=linux,kubernetes.io/hostname=master,node-role.kubernetes.io/master= node01 Ready <none> 54d v1.13.4 beta.kubernetes.io/arch=amd64,beta.kubernetes.io/os=linux,kubernetes.io/hostname=node01 node02 Ready <none> 6d19h v1.13.4 beta.kubernetes.io/arch=amd64,beta.kubernetes.io/os=linux,kubernetes.io/hostname=node02 # 添加一个key为disktype和value为ssd的label [root@master ~]# kubectl label nodes node01 disktype=ssd node/node01 labeled # 查看是否被添加 [root@master ~]# kubectl get nodes --show-labels NAME STATUS ROLES AGE VERSION LABELS master Ready master 54d v1.13.4 beta.kubernetes.io/arch=amd64,beta.kubernetes.io/os=linux,kubernetes.io/hostname=master,node-role.kubernetes.io/master= node01 Ready <none> 54d v1.13.4 beta.kubernetes.io/arch=amd64,beta.kubernetes.io/os=linux,disktype=ssd,kubernetes.io/hostname=node01 

删除Label

# 语法
kubectl label nodes <node-name> <label-key>- 

# 删除key为disktype的label [root@master ~]# kubectl label nodes node01 disktype- node/node01 labeled [root@master ~]# kubectl get nodes --show-labels NAME STATUS ROLES AGE VERSION LABELS master Ready master 54d v1.13.4 beta.kubernetes.io/arch=amd64,beta.kubernetes.io/os=linux,kubernetes.io/hostname=master,node-role.kubernetes.io/master= node01 Ready <none> 54d v1.13.4 beta.kubernetes.io/arch=amd64,beta.kubernetes.io/os=linux,kubernetes.io/hostname=node01 node02 Ready <none> 6d19h v1.13.4 beta.kubernetes.io/arch=amd64,beta.kubernetes.io/os=linux,kubernetes.io/hostname=node02 

修改Label的值，

#语法: 需要加上--overwrite参数： kubectl label nodes <node-name> <label-key>=<label-value> --overwrite [root@master ~]# kubectl label nodes node01 disktype=ssd node/node01 labeled [root@master ~]# kubectl label nodes node01 disktype=hdd --overwrite node/node01 labeled [root@master ~]# kubectl get nodes --show-labels NAME STATUS ROLES AGE VERSION LABELS master Ready master 54d v1.13.4 beta.kubernetes.io/arch=amd64,beta.kubernetes.io/os=linux,kubernetes.io/hostname=master,node-role.kubernetes.io/master= node01 Ready <none> 54d v1.13.4 beta.kubernetes.io/arch=amd64,beta.kubernetes.io/os=linux,disktype=hdd,kubernetes.io/hostname=node01 node02 Ready <none> 6d19h v1.13.4 beta.kubernetes.io/arch=amd64,beta.kubernetes.io/os=linux,kubernetes.io/hostname=node02 

Pod选择Label

# 添加nodeSelector选项用来选择对应的node
apiVersion: v1
kind: Pod
metadata:
  name: nginx
  labels:
    env: test
spec:
  containers:
  - name: nginx
    image: nginx
    imagePullPolicy: IfNotPresent
  nodeSelector:
    disktype: ssd