bash 使用 Dockerfile 设置多行环境变量
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Set Multiline Environment Variable with Dockerfile
提问by Daniel Rasmuson
I want to set a multiline environment variable in my Dockerfile.
我想在我的 Dockerfile 中设置一个多行环境变量。
Works through command line
通过命令行工作
If I pass in the environment variable through docker runeverything works.
如果我通过docker run一切正常传递环境变量。
CONFIG="port: 4466
databases:
prod:
connector: mysql
active: true
host: 33.333.333.333
port: 3306
user: root
password: pass"
docker run --env CONFIG="$CONFIG" ubuntu:latest env | grep 'CONFIG'
Output (its only a single line because its interpreted as multiline variable)
输出（它只有一行，因为它被解释为多行变量）
CONFIG=port: 4466
Doesnt Work through dockerfile
不通过 dockerfile 工作
Dockerfile
文件
FROM ubuntu:latest
ENV CONFIG 'port: 4466\ndatabases:\n prod:\n connector: mysql\n active: true\n host: host\n port: 3306\n user: root\n password: pass'
Build and run the docker image
构建并运行 docker 镜像
docker build -t multilinetest .
docker run multilinetest env | grep 'CONFIG'
Output
输出
CONFIG=port: 4466\ndatabases:\n prod:\n connector: mysql\n active: true\n host: host\n port: 3306\n user: root\n password: pass
Expected
预期的
Both scenarios should store the same environment variable (I'm passing this environment variable into a 3rd party image that requires a multiline string)
两种场景都应该存储相同的环境变量（我将此环境变量传递到需要多行字符串的第 3 方图像中）
回答by Daniel Rasmuson
I was able to get this working by passing the multiline environment variable as a build arg to docker build.
我能够通过将多行环境变量作为构建参数传递给 docker build 来使其工作。
Dockerfile
文件
FROM ubuntu:latest
ARG CONFIG
ENV CONFIG $CONFIG
Build Command
构建命令
CONFIG="port: 4466
databases:
prod:
connector: mysql
active: true
host: 33.333.333.333
port: 3306
user: root
password: pass"
docker build --build-arg CONFIG="$CONFIG" ubuntu:latest env | grep 'CONFIG'
回答by édouard Lopez
Escaping newline characters work fine.
转义换行符工作正常。
Dockerfile
文件
ENV BUILD_DEPENDENCIES apt-utils \
curl \
libc-dev \
gcc \
gnupg2
Output
输出
Step 8/48 : ENV BUILD_DEPENDENCIES apt-utils curl libc-dev gcc gnupg2
---> Running in 65b0ad105af4
