Docker Compose 中参数的传递

优先级

docker-compose file
Shell environment variables
Environment file
Dockerfile
Variable is not defined

export

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# 此命令放在 .sh 脚本中时，环境变量仅在执行当前脚本或子脚本时生效
export TAG=2.0.2

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# docker-compose.yml
version: '3'

services:
  test-service:
    image: test-service:${TAG}
    container_name: test-service
    ...

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# 执行 docker-compose up -d 时会读取 TAG 为 2.0.2
docker-compose up -d

.env

在 docker-compose.yml 文件同级目录下创建 .env 文件

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TAG="2.0.2"

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# docker-compose.yml
version: '3'

services:
  test-service:
    image: test-service:${TAG}
    container_name: test-service
    ...

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# 执行 docker-compose up -d 时，会将 ${TAG} 替换为 .env 中的 2.0.2
docker-compose up -d

Enviroment

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# docker-compose.yml
version: '3'
services:
  data-tag-biz:
    image: 192.168.1.XX/xxxx/data-standard-biz:9.0
    network_mode: "host"
    restart: always
    ports:
      - 10015:9015
    environment:
      - NACOS-HOST=${NACOS_HOST}
      - SW_NAME=test:${SV_NAME}
      - SW_SERVICES=192.168.1.XX:11800
      - TRACK=-javaagent:/opt/skywalking-agent.jar
      - JAVA_OPTS=-Xms512m -Xmx1024m -XX:SurvivorRatio=8 -XX:+UseConcMarkSweepGC
    container_name: data-standard-biz-9

dockerfile

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ENV NODE_VERSION 7.2.0

RUN curl -SLO "https://nodejs.org/dist/v$NODE_VERSION/node-v$NODE_VERSION-linux-x64.tar.xz" \
  && curl -SLO "https://nodejs.org/dist/v$NODE_VERSION/SHASUMS256.txt.asc"