Merge pull request #5466 from YuxiJin-tobeyjin/inject-env2
ZTE-SH-CN-define-environment-variable-containerpull/5550/merge
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---
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title: 为容器设置环境变量
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---
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{% capture overview %}
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本页将展示如何为kubernetes Pod下的容器设置环境变量。
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{% endcapture %}
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{% capture prerequisites %}
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{% include task-tutorial-prereqs.md %}
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{% endcapture %}
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{% capture steps %}
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## 为容器设置一个环境变量
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创建Pod时,可以为其下的容器设置环境变量。通过配置文件的`env`或者`envFrom` 字段来设置环境变量。
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本示例中,将创建一个只包含单个容器的Pod。Pod的配置文件中设置环境变量的名称为`DEMO_GREETING`,
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其值为`"Hello from the environment"`。下面是Pod的配置文件内容:
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{% include code.html language="yaml" file="envars.yaml" ghlink="/docs/tasks/inject-data-application/envars.yaml" %}
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1. 基于YAML文件创建一个Pod:
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kubectl create -f https://k8s.io/docs/tasks/inject-data-application/envars.yaml
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1. 获取一下当前正在运行的Pods信息:
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kubectl get pods -l purpose=demonstrate-envars
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查询结果应为:
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NAME READY STATUS RESTARTS AGE
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envar-demo 1/1 Running 0 9s
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1. 进入该Pod下的容器并打开一个命令终端:
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kubectl exec -it envar-demo -- /bin/bash
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1. 在命令终端中通过执行`printenv`打印出环境变量。
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root@envar-demo:/# printenv
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打印结果应为:
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NODE_VERSION=4.4.2
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EXAMPLE_SERVICE_PORT_8080_TCP_ADDR=10.3.245.237
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HOSTNAME=envar-demo
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...
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DEMO_GREETING=Hello from the environment
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1. 通过键入`exit`退出命令终端。
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{% endcapture %}
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{% capture whatsnext %}
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* 有关环境变量的更多信息,请参阅[这里](/docs/tasks/configure-pod-container/environment-variable-expose-pod-information/)。
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* 有关如何通过环境变量来使用Secret,请参阅[这里](/docs/user-guide/secrets/#using-secrets-as-environment-variables)。
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* 关于[EnvVarSource](/docs/api-reference/{{page.version}}/#envvarsource-v1-core)资源的信息。
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{% endcapture %}
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{% include templates/task.md %}
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@ -0,0 +1,13 @@
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apiVersion: v1
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kind: Pod
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metadata:
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name: envar-demo
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labels:
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purpose: demonstrate-envars
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spec:
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containers:
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- name: envar-demo-container
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image: gcr.io/google-samples/node-hello:1.0
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env:
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- name: DEMO_GREETING
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value: "Hello from the environment"
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