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wxh16144/learn-docker-env

By wxh16144

•Updated almost 2 years ago

Image
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wxh16144/learn-docker-env repository overview

⁠learn-docker-env

一个简单的项目，学习多种方式向 Docker 容器中传递环境变量

⁠构建/拉取镜像

docker build -t wxh16144/learn-docker-env:latest . # <= 注意最后的点
# or
docker pull wxh16144/learn-docker-env:latest # <= 从 Docker Hub 拉取

⁠1. 通过 docker run 命令行参数传递环境变量

docker run --rm -it -e MY_FOO=bar wxh16144/learn-docker-env:latest
查看输出 
➜ docker run --rm -it -e MY_FOO=bar wxh16144/learn-docker-env:latest
============================================================================
========================== ENVIRONMENT VARIABLES ===========================
============================================================================
HOSTNAME=83479b1e89e0
MY_FOO=bar
SHLVL=1
HOME=/root
TERM=xterm
PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
PWD=/app
============================================================================
========================== END OF ENVIRONMENT VARIABLES ====================
============================================================================
Container is running. Press Ctrl+C to exit.

⁠2. 通过 docker-compose.yml 中的 environment 传递环境变量

docker-compose.yml

services:
  learn-docker-env:
    image: wxh16144/learn-docker-env:latest
    environment:
      MY_BAR: bar
查看输出 
============================================================================
========================== ENVIRONMENT VARIABLES ===========================
============================================================================
HOSTNAME=42f8af0b7093
SHLVL=1
HOME=/root
PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
MY_BAR=bar
PWD=/app
============================================================================
========================== END OF ENVIRONMENT VARIABLES ====================
============================================================================
Container is running. Press Ctrl+C to exit.

⁠3. 通过 docker-compose.yml 中的 .env 文件传递环境变量

.env

MY_BAZ=bar

docker-compose.yml

services:
  learn-docker-env:
    image: wxh16144/learn-docker-env:latest
    env_file:
      - .env
查看输出 
============================================================================
========================== ENVIRONMENT VARIABLES ===========================
============================================================================
HOSTNAME=bdda7aa8cd0e
SHLVL=1
HOME=/root
PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
PWD=/app
MY_BAZ=bar
============================================================================
========================== END OF ENVIRONMENT VARIABLES ====================
============================================================================
Container is running. Press Ctrl+C to exit.

⁠其他

⁠将宿主机的以 MY_ 开头的环境变量传递给容器
docker run -it --rm \
  $(printenv | grep '^MY_' | sed 's/^/-e /') \
  wxh16144/learn-docker-env:latest
  1. printenv | grep '^MY_'：获取所有以 MY_ 开头的环境变量。
  2. sed 's/^/-e /'：在每个环境变量前面加上 -e 选项，以便 docker run 能够识别它们。
⁠docker-compose 中使用插值法

Read more: Environment variables in Compose⁠

docker-compose.yml

services:
  learn-docker-env:
    image: wxh16144/learn-docker-env:latest
    environment:
      MY_FOO: ${MY_FOO：default}

Tag summary

Content type

Image

Digest

sha256:c42ddbcd1…

Size

4.7 MB

Last updated

almost 2 years ago

docker pull wxh16144/learn-docker-env