Kubernetes 1.5 实践如何给pod中的容器设置环境变量

2024-06-28 16:00:46

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Kubernetes 1.5 给POD设置变量

When you create a Pod, you can set environment variables for the containers that run in the Pod. To set environment variables, include the env field in the configuration file. 在创建pod时，你可以为运行在pod中的容器设置环境变量。当我们需要设置变量时，我们只需要在配置文件中（yaml）中加入env选项。

In this exercise, you create a Pod that runs one container. The configuration file for the Pod defines an environment variable with name DEMO_GREETING and value “Hello from the environment”. Here is the configuration file for the Pod: 在这个练习中，你将创建一个运行了一个容器的pod。在配置文件中为pod定义的的一个环境变量名为 DEMO_GREETING，值为 “Hello from the environment”。这个pod的配置文件envars.yaml如下：

apiVersion: v1kind: Podmetadata: name: envar-demo labels: purpose: demonstrate-envarsspec: containers: - name: envar-demo-container image: gcr.io/google-samples/node-hello:1.0 env: - name: DEMO_GREETING value: "Hello from the environment"

Create a Pod based on the YAML configuration file: 通过YAML配置文件创建Pod:

kubectl create -f http://k8s.io/docs/tasks/configure-pod-container/envars.yaml

List the running Pods: 查看正在运行的Pods

kubectl get pods -l purpose=demonstrate-envars

The output is similar to this: 输出内容如下：

NAME READY STATUS RESTARTS AGE envar-demo 1/1 Running 0 9s

Get a shell to the container running in your Pod: 连接到Pod中的容器：

kubectl exec -it envar-demo -- /bin/bash

In your shell, run the PRintenv command to list the environment variables. 在这个shell中，执行命令printenv命令查看环境变量。

root@envar-demo:/# printenv

The output is similar to this: 输出内容如下:

NODE_VERSION=4.4.2 EXAMPLE_SERVICE_PORT_8080_TCP_ADDR=10.3.245.237 HOSTNAME=envar-demo ... DEMO_GREETING=Hello from the environment