Actual Production Environment: Detailed Explanation of the Latest K8s Lables

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yaml please download to my github to learn!

github: https://github.com/heyangguang

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Labels official website

https://kubernetes.io/docs/co...

Labels introduction

Literally, it means labeling our different Pod s or Controller s to achieve the following functions:

Indicator meta-information
Controller and Service can control Pod life cycle through label selector
Impacts on Scheduling

Lables view

[root@master01 ~]# kubectl get nodes --show-labels
NAME       STATUS   ROLES    AGE   VERSION   LABELS
master01   Ready    master   11h   v1.15.2   beta.kubernetes.io/arch=amd64,beta.kubernetes.io/os=linux,kubernetes.io/arch=amd64,kubernetes.io/hostname=master01,kubernetes.io/os=linux,node-role.kubernetes.io/master=
node01     Ready    work     11h   v1.15.2   beta.kubernetes.io/arch=amd64,beta.kubernetes.io/os=linux,kubernetes.io/arch=amd64,kubernetes.io/hostname=node01,kubernetes.io/os=linux,node-role.kubernetes.io/work=
node02     Ready    work     11h   v1.15.2   beta.kubernetes.io/arch=amd64,beta.kubernetes.io/os=linux,kubernetes.io/arch=amd64,kubernetes.io/hostname=node02,kubernetes.io/os=linux,node-role.kubernetes.io/work=

Lables creation

Keep in mind that the tag format is < Key: Value > and that Key must be unique for a given value.

1. Use yaml to create labels for Pod

[root@master01 ~]# cat pod-labels.yaml
apiVersion: v1
kind: Pod
metadata:
  name: label-demo
  labels:
    environment: production
    app: nginx
spec:
  containers:
  - name: nginx
    image: nginx:1.7.9
    ports:
    - containerPort: 80
[root@master01 ~]# kubectl apply -f pod-labels.yaml
pod/label-demo created
[root@master01 ~]# kubectl get pods --show-labels
NAME         READY   STATUS    RESTARTS   AGE   LABELS
label-demo   1/1     Running   0          65s   app=nginx,environment=production

2. Create tags from the command line

[root@master01 ~]# kubectl get nodes --show-labels
NAME       STATUS   ROLES    AGE   VERSION   LABELS
master01   Ready    master   11h   v1.15.2   beta.kubernetes.io/arch=amd64,beta.kubernetes.io/os=linux,kubernetes.io/arch=amd64,kubernetes.io/hostname=master01,kubernetes.io/os=linux,node-role.kubernetes.io/master=
node01     Ready    work     11h   v1.15.2   beta.kubernetes.io/arch=amd64,beta.kubernetes.io/os=linux,kubernetes.io/arch=amd64,kubernetes.io/hostname=node01,kubernetes.io/os=linux,node-role.kubernetes.io/work=
node02     Ready    work     11h   v1.15.2   beta.kubernetes.io/arch=amd64,beta.kubernetes.io/os=linux,kubernetes.io/arch=amd64,kubernetes.io/hostname=node02,kubernetes.io/os=linux,node-role.kubernetes.io/work=
[root@master01 ~]# kubectl label nodes node01 disktype=ssd
node/node01 labeled
[root@master01 ~]# kubectl get nodes node01 --show-labels
NAME     STATUS   ROLES   AGE   VERSION   LABELS
node01   Ready    work    11h   v1.15.2   beta.kubernetes.io/arch=amd64,beta.kubernetes.io/os=linux,disktype=ssd,kubernetes.io/arch=amd64,kubernetes.io/hostname=node01,kubernetes.io/os=linux,node-role.kubernetes.io/work=

Lables delete

[root@master01 ~]# kubectl label nodes node01 disktype-
node/node01 labeled
[root@master01 ~]# kubectl get nodes node01 --show-labels
NAME     STATUS   ROLES   AGE   VERSION   LABELS
node01   Ready    work    11h   v1.15.2   beta.kubernetes.io/arch=amd64,beta.kubernetes.io/os=linux,kubernetes.io/arch=amd64,kubernetes.io/hostname=node01,kubernetes.io/os=linux,node-role.kubernetes.io/work=

Keywords: Linux Kubernetes Nginx github

Added by PHPist on Sun, 06 Oct 2019 11:33:14 +0300

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