環境変数を使ってみる (kubernetes)
kubernetes
Published: 2021-01-01

やったこと

環境変数をコンテナに渡してみます。

確認環境

$ k version
Client Version: version.Info{Major:"1", Minor:"16", GitVersion:"v1.16.2", GitCommit:"c97fe5036ef3df2967d086711e6c0c405941e14b", GitTreeState:"clean", BuildDate:"2019-10-15T19:18:23Z", GoVersion:"go1.12.10", Compiler:"gc", Platform:"darwin/amd64"}
Server Version: version.Info{Major:"1", Minor:"19", GitVersion:"v1.19.3", GitCommit:"1e11e4a2108024935ecfcb2912226cedeafd99df", GitTreeState:"clean", BuildDate:"2020-10-14T12:41:49Z", GoVersion:"go1.15.2", Compiler:"gc", Platform:"linux/amd64"}

調査

sample.yaml 

apiVersion: v1
kind: Pod
metadata:
  name: first-env
spec:
  containers:
    - name: nginx-container
      image: nginx:1.17
      env:
      - name: MY_GREETING
        value: "Warm greetings to"
      - name: MY_MEM_REQUEST
        valueFrom:
          resourceFieldRef:
            containerName: nginx-container
            resource: requests.memory

マニフェストの適用 + 環境変数の確認

$ k apply -f sample.yaml
pod/first-env created
$ k exec -it first-env -- env | grep "MY_"
MY_GREETING=Warm greetings to
MY_MEM_REQUEST=0

参考