一、配置容器的环境变量

1.1 编写yaml文件

如下，编写pod_env.yaml文件，内容如下，通过env关键字来定义环境变量，环境变量通过name，value对来设置，如下：

apiVersion: v1
kind: Namespace
metadata:
  name: dev

---

apiVersion: v1
kind: Pod
metadata:
  name: pod-env
  namespace: dev
  labels:
    user: redrose2100
spec:
  containers:
  - name: nginx
    image: nginx:1.17.1
    env:
    - name: "username"
      value: "admin"
    - name: "password"
      value: "admin123"

1.2 创建资源

使用如下命令创建资源

[root@master pod]# kubectl apply -f pod_env.yaml
namespace/dev created
pod/pod-env created
[root@master pod]#

1.3 进入容器查看环境变量

使用如下命令进入容器，并打印环境变量username和password，如下，均与设置一致

[root@master pod]# kubectl get pod -n dev
NAME      READY   STATUS    RESTARTS   AGE
pod-env   1/1     Running   0          3m
[root@master pod]# kubectl exec pod-env -n dev -it -c nginx /bin/bash
kubectl exec [POD] [COMMAND] is DEPRECATED and will be removed in a future version. Use kubectl exec [POD] -- [COMMAND] instead.
root@pod-env:/# echo $username
admin
root@pod-env:/# echo $password
admin123
root@pod-env:/#

1.4 删除资源

使用如下命令删除资源

[root@master pod]# kubectl delete -f pod_env.yaml
namespace "dev" deleted
pod "pod-env" deleted
[root@master pod]#