[英]docker-compose, can't print environment variable in docker container
I want to print environment variable defined in docker-compose file.我想打印 docker-compose 文件中定义的环境变量。
Here is my docker-compose-1.yml
:这是我docker-compose-1.yml
:
version: '3.6'
services:
busybox:
image: busybox
command: 'echo $DEBUG'
environment:
- DEBUG='123456'
And, try to print the DEBUG
environment variable in docker container:并且,尝试在 docker 容器中打印DEBUG
环境变量:
☁ environment-variables-in-compose [master] ⚡ docker-compose -f docker-compose-1.yml up
WARNING: The DEBUG variable is not set. Defaulting to a blank string.
Creating network "environmentvariablesincompose_default" with the default driver
Creating environmentvariablesincompose_busybox_1 ... done
Attaching to environmentvariablesincompose_busybox_1
busybox_1 |
environmentvariablesincompose_busybox_1 exited with code 0
As you can see, got WARNING: The DEBUG variable is not set. Defaulting to a blank string.
如您所见,收到WARNING: The DEBUG variable is not set. Defaulting to a blank string.
WARNING: The DEBUG variable is not set. Defaulting to a blank string.
Am I wrong?我错了吗?
update 1:更新1:
docker-compose-1.yml
: docker-compose-1.yml
:
version: '3.6'
services:
busybox:
image: busybox
command: 'echo $$DEBUG'
environment:
DEBUG: 123456
I change command
using double $
sign, but the result is still not what I want.我使用双$
符号更改command
,但结果仍然不是我想要的。
☁ environment-variables-in-compose [master] ⚡ docker-compose -f docker-compose-1.yml up
Creating network "environmentvariablesincompose_default" with the default driver
Creating environmentvariablesincompose_busybox_1 ... done
Attaching to environmentvariablesincompose_busybox_1
busybox_1 | $DEBUG
environmentvariablesincompose_busybox_1 exited with code 0
As you can see, the environment variable is printed as $DEBUG
, not expected value 123456
如您所见,环境变量打印为$DEBUG
,而不是预期值123456
Compose will expand variables from the environment where you are running compose. Compose 将从您运行 compose 的环境中扩展变量。 To expand the variable inside your container, escape the $
using $$
:为扩大变量的容器内,躲避$
使用$$
:
command: '/bin/sh -c "echo $$DEBUG"'
For more details, see: https://docs.docker.com/compose/compose-file/#variable-substitution有关更多详细信息,请参阅: https : //docs.docker.com/compose/compose-file/#variable-substitution
Edit: I've also added a shell inside the container to expand the variable.编辑:我还在容器内添加了一个 shell 来扩展变量。
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.