只有容器的情况下:

apiVersion: v1
kind: Pod
metadata:
  name: envpod
spec:
  containers:
    - name: test-container
      #image: k8s.gcr.io/busybox
      image: busybox
      command: [ "sh", "-c"]
      args:
      - while true; do
          echo -en '\n';
          printenv MY_NAME;
          sleep 10;
        done;
      env:
        - name: MY_NAME
          value: name1
  restartPolicy: Never

kubectl edit po envpod 更改了MY_NAME这个环境变量后
1. pod不会重启
2. 里面的程序也感知不到环境变量的变化

ReplicaController

apiVersion: v1
kind: ReplicationController
metadata:
  name: env-rc
spec:
  replicas: 1
  selector:
    app: env-rc-pod
  template:
    metadata:
      labels:
        app: env-rc-pod
    spec:
      containers:
      - name: test-container
        image: busybox
        command: [ "sh", "-c"]
        args:
        - while true; do
            echo -en '\n';
            printenv MY_NAME;
            sleep 10;
          done;
        env:
          - name: MY_NAME
            value: name1

kubectl edit rc env-rc 更改了MY_NAME这个环境变量后
1. rc不会重启
2. pod也不会有什么变化
3. 里面的程序也感知不到环境变量的变化

ReplicaSet

apiVersion: apps/v1
kind: ReplicaSet
metadata:
  name: env-rs
spec:
  replicas: 1
  selector:
    matchLabels:
      app: env-rs-pod
  template:
    metadata:
      labels:
        app: env-rs-pod
    spec:
      containers:
      - name: test-container
        image: busybox
        command: [ "sh", "-c"]
        args:
        - while true; do
            echo -en '\n';
            printenv MY_NAME;
            sleep 10;
          done;
        env:
          - name: MY_NAME
            value: name1

kubectl edit rs env-rs 更改了MY_NAME这个环境变量后
1. rs不会重启
2. pod也不会有什么变化
3. 里面的程序也感知不到环境变量的变化

Deployment

apiVersion: apps/v1
kind: Deployment
metadata:
  name: env-deploy
spec:
  replicas: 1
  selector:
    matchLabels:
      app: env-deploy-pod
  template:
    metadata:
      labels:
        app: env-deploy-pod
    spec:
      containers:
      - name: test-container
        image: busybox
        command: [ "sh", "-c"]
        args:
        - while true; do
            echo -en '\n';
            printenv MY_NAME;
            sleep 10;
          done;
        env:
          - name: MY_NAME
            value: name1

kubectl edit deploy env-deploy 更改了MY_NAME这个环境变量后
1. deploy 不会有什么变化
2. 对应的pod会进行rolling update
3. 新创建出来的pod使用新的环境变量
4. 多出一个rs:

  	root@ubuntu18:~/k8s/env# k get rs
  	NAME                    DESIRED   CURRENT   READY   AGE
  	env-deploy-5b79f7f777   0         0         0       29m
  	```