在Docker中如何使用环境变量编写

问题描述：

我希望能够在docker-compose.yml中使用env变量，并在docker-compose时传入值。
这是一个例子。我今天正在使用基本的docker运行命令，它是围绕我自己的脚本。
有没有办法通过compose实现它，没有任何这样的bash包装？

I would like to be able to use env variables inside docker-compose.yml, with values passed in at the time of docker-compose up. This is the example. I am doing this today with basic docker run command, which is wrapped around my own script. Is there a way to achieve it with compose, without any such bash wrappers?

proxy:
  hostname: $hostname
  volumes:
    - /mnt/data/logs/$hostname:/logs
    - /mnt/data/$hostname:/data

答

创建一个 template.yml ，这是你的 docker-compose.yml 与环境变量。

假设你的环境变量是文件'env.sh'

将下面的代码放在sh文件中并运行。

Create a template.yml, which is your docker-compose.yml with environment variable.
Suppose your environment variables are in a file 'env.sh'
Put the below piece of code in a sh file and run it.

source env.sh;
rm -rf docker-compose.yml;
envsubst< template.yml>docker-compose.yml;

source env.sh; rm -rf docker-compose.yml; envsubst < "template.yml" > "docker-compose.yml";

一个新文件 docker-compose。将使用正确的环境变量值生成yml 。

示例template.yml文件：

Sample template.yml file:

oracledb:
        image: ${ORACLE_DB_IMAGE}
        privileged: true
        cpuset: "0"
        ports:
                - "${ORACLE_DB_PORT}:${ORACLE_DB_PORT}"
        command: /bin/sh -c "chmod 777 /tmp/start; /tmp/start"
        container_name: ${ORACLE_DB_CONTAINER_NAME}

示例env.sh文件：

Sample env.sh file:

#!/bin/bash 
export ORACLE_DB_IMAGE=<image-name> 
export ORACLE_DB_PORT=<port to be exposed> 
export ORACLE_DB_CONTAINER_NAME=ORACLE_DB_SERVER

在Docker中如何使用环境变量编写

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