Compose
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Engine
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apt-cacher-ng
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本文檔使用 PHP中文網(wǎng)手冊 發(fā)布
文字
撰寫中有多個部分在某種意義上處理環(huán)境變量。這個頁面應(yīng)該可以幫助你找到你需要的信息。
在組合文件中替換環(huán)境變量
可以在 shell 中使用環(huán)境變量填充復(fù)合文件中的值：
web:
image: "webapp:${TAG}"有關(guān)更多信息，請參見變量替換節(jié)中的“撰寫文件引用”。
在容器中設(shè)置環(huán)境變量
可以在服務(wù)的容器中設(shè)置環(huán)境變量。“環(huán)境”鍵，就像docker run -e VARIABLE=VALUE ...*
web: environment: - DEBUG=1
將環(huán)境變量傳遞到容器
可以將環(huán)境變量直接從shell傳遞到服務(wù)的容器，“環(huán)境”鍵不給他們一個價值，就像docker run -e VARIABLE ...*
web: environment: - DEBUG
DEBUG容器中的變量的值將從運行復(fù)合的 shell 中相同變量的值中提取。
“env_file“ 配置選項
可以將多個環(huán)境變量從外部文件傳遞到服務(wù)的容器，env_file
選項，就像docker run --env-file=FILE ...*
web: env_file: - web-variables.env
以 “docker-compose run”設(shè)置環(huán)境變量
就像docker run -e，則可以在一次性容器上設(shè)置環(huán)境變量docker-compose run -e*。
docker-compose run -e DEBUG=1 web python console.py
還可以通過不給變量值從 shell 傳遞變量：
docker-compose run -e DEBUG web python console.py
DEBUG容器中的變量的值將從運行復(fù)合的 shell 中的相同變量的值中提取。
“.env”文件
控件中引用的任何環(huán)境變量或用于配置撰寫的任何環(huán)境變量的默認值。環(huán)境文件命名.env*
$ cat .env
TAG=v1.5$ cat docker-compose.yml
version: '3'services:
web:
image: "webapp:${TAG}"當(dāng)你運行的時候docker-compose up，web上面定義的服務(wù)使用圖像webapp:v1.5.您可以使用配置命令，它將已解析的應(yīng)用程序配置打印到終端：
$ docker-compose config version: '3'services: web: image: 'webapp:v1.5'
shell 中的值優(yōu)先于.env文件中指定的值。如果你TAG在你的
shell 中設(shè)置了一個不同的值，那么這個替換就會image使用它：
$ export TAG=v2.0$ docker-compose config version: '3'services: web: image: 'webapp:v2.0'
當(dāng)使用 shell 中 environment變量和env_file配置文件提供值時，環(huán)境變量的值將首先從環(huán)境密鑰獲取，然后從環(huán)境文件獲取，然后從 ** -entry ** 獲取：Dockerfile ENV
$ cat ./Docker/api/api.env NODE_ENV=test $ cat docker-compose.yml version: '3'services: api: image: 'node:6-alpine' env_file: - ./Docker/api/api.env environment: - NODE_ENV=production
你可以用它來測試?yán)?NodeJSCLI 中的容器：
$ docker-compose exec api node> process.env.NODE_ENV'production'
有任何ARG或ENV設(shè)置在Dockerfile只有在否碼頭工人作曲進入environment或env_file
NodeJS 容器專用材料：如果你有package.json進入script:start就像NODE_ENV=test node server.js，這將推翻你的docker-compose.yml檔案中任何文件。
使用環(huán)境變量配置組合
有幾個環(huán)境變量可供您配置 Docker Compose 命令行行為。它們以 CLI 環(huán)境變量開頭COMPOSE_或DOCKER_記錄在 CLI 環(huán)境變量中。
由鏈接創(chuàng)建的環(huán)境變量
在 v1 撰寫文件中使用 'links' 選項時，將為每個鏈接創(chuàng)建環(huán)境變量。它們記錄在 Link 環(huán)境變量參考中。但請注意，這些變量已被棄用 - 您應(yīng)該將鏈接別名用作主機名。