label的使用

查看物理节点

root@ubuntu-128:~# kubectl  get nodes
NAME         STATUS     ROLES    AGE   VERSION
ubuntu-128   Ready      master   31h   v1.13.1
ubuntu-129   NotReady   <none>   31h   v1.13.1
ubuntu-130   NotReady   <none>   31h   v1.13.1

给ubuntu-129和ubutu-130  roles增加标签 

root@ubuntu-128:~# kubectl  label nodes ubuntu-129 node-role.kubernetes.io/node=node1
node/ubuntu-129 labeled
root@ubuntu-128:~# kubectl  label nodes ubuntu-130 node-role.kubernetes.io/node=node1
node/ubuntu-130 labeled
root@ubuntu-128:~# kubectl  get nodes
NAME         STATUS     ROLES    AGE   VERSION
ubuntu-128   Ready      master   31h   v1.13.1
ubuntu-129   NotReady   node     31h   v1.13.1
ubuntu-130   NotReady   node     31h   v1.13.1

按照标签形式查看nodes,其实node-role.kubernetes.io/master来解决roles这个标签的

root@ubuntu-128:~# kubectl  get nodes --show-labels
NAME         STATUS     ROLES    AGE   VERSION   LABELS
ubuntu-128   Ready      master   31h   v1.13.1   beta.kubernetes.io/arch=amd64,beta.kubernetes.io/os=linux,kubernetes.io/hostname=ubuntu-128,node-role.kubernetes.io/master=
ubuntu-129   NotReady   node     31h   v1.13.1   beta.kubernetes.io/arch=amd64,beta.kubernetes.io/os=linux,kubernetes.io/hostname=ubuntu-129,node-role.kubernetes.io/node=node1
ubuntu-130   NotReady   node     31h   v1.13.1   beta.kubernetes.io/arch=amd64,beta.kubernetes.io/os=linux,kubernetes.io/hostname=ubuntu-130,node-role.kubernetes.io/node=node2

删除标签 

root@ubuntu-128:~# kubectl  label nodes ubuntu-130 node-role.kubernetes.io/node-
root@ubuntu-128:~# kubectl  get nodes --show-labels
NAME         STATUS     ROLES    AGE   VERSION   LABELS
ubuntu-128   Ready      master   31h   v1.13.1   beta.kubernetes.io/arch=amd64,beta.kubernetes.io/os=linux,kubernetes.io/hostname=ubuntu-128,node-role.kubernetes.io/master=
ubuntu-129   NotReady   node     31h   v1.13.1   beta.kubernetes.io/arch=amd64,beta.kubernetes.io/os=linux,kubernetes.io/hostname=ubuntu-129,node-role.kubernetes.io/node=node1
ubuntu-130   NotReady   <none>   31h   v1.13.1   beta.kubernetes.io/arch=amd64,beta.kubernetes.io/os=linux,kubernetes.io/hostname=ubuntu-130
root@ubuntu-128:~# kubectl  get nodes
NAME         STATUS     ROLES    AGE   VERSION
ubuntu-128   Ready      master   31h   v1.13.1
ubuntu-129   NotReady   node     31h   v1.13.1
ubuntu-130   NotReady   <none>   31h   v1.13.1

修改标签

root@ubuntu-128:~# kubectl  label nodes ubuntu-130 node-role.kubernetes.io/node=node2
root@ubuntu-128:~# kubectl  get nodes --show-labels
NAME         STATUS     ROLES    AGE   VERSION   LABELS
ubuntu-128   Ready      master   31h   v1.13.1   beta.kubernetes.io/arch=amd64,beta.kubernetes.io/os=linux,kubernetes.io/hostname=ubuntu-128,node-role.kubernetes.io/master=
ubuntu-129   NotReady   node     31h   v1.13.1   beta.kubernetes.io/arch=amd64,beta.kubernetes.io/os=linux,kubernetes.io/hostname=ubuntu-129,node-role.kubernetes.io/node=node1
ubuntu-130   NotReady   node     31h   v1.13.1   beta.kubernetes.io/arch=amd64,beta.kubernetes.io/os=linux,kubernetes.io/hostname=ubuntu-130,node-role.kubernetes.io/node=node2

https://github.com/heheliu321/Kubernetes-CN/blob/master/section3/pod/nginx_busybox.yml