如何将环境变量传递给 Docker 容器? [英] How do I pass environment variables to Docker containers?
问题描述
我是 Docker 的新手,不清楚如何从容器访问外部数据库.是在连接字符串中进行硬编码的最佳方式吗?
# DockerfileENV DATABASE_URL amazon:rds/connection?string
您可以使用 -e
标志将环境变量传递给您的容器.
来自启动脚本的示例:
sudo docker run -d -t -i -e REDIS_NAMESPACE='staging' -e POSTGRES_ENV_POSTGRES_PASSWORD='foo' -e POSTGRES_ENV_POSTGRES_USER='bar' -e POSTGRES_ENV_DB_NAME='mysite_staging' -e POSTGRES_PORT_5432_TCP_ADDR='docker-db-1.hidden.us-east-1.rds.amazonaws.com' -e SITE_URL='staging.mysite.com' -p 80:80 --link redis:redis --name 容器名称 dockerhub_id/image_name
或者,如果您不想在命令行中将值显示在 ps
等处,-e
可以拉入如果你只是在没有 =
的情况下给它当前环境的值:
sudo PASSWORD='foo' docker run [...] -e PASSWORD [...]
如果你有很多环境变量,特别是如果它们是秘密的,你可以使用环境文件:
$ docker run --env-file ./env.list ubuntu bash
<块引用>
--env-file 标志将文件名作为参数,并期望每一行采用 VAR=VAL 格式,模仿传递给 --env 的参数.注释行只需要以 #
为前缀I'm new to Docker, and it's unclear how to access an external database from a container. Is the best way to hard-code in the connection string?
# Dockerfile
ENV DATABASE_URL amazon:rds/connection?string
You can pass environment variables to your containers with the -e
flag.
An example from a startup script:
sudo docker run -d -t -i -e REDIS_NAMESPACE='staging'
-e POSTGRES_ENV_POSTGRES_PASSWORD='foo'
-e POSTGRES_ENV_POSTGRES_USER='bar'
-e POSTGRES_ENV_DB_NAME='mysite_staging'
-e POSTGRES_PORT_5432_TCP_ADDR='docker-db-1.hidden.us-east-1.rds.amazonaws.com'
-e SITE_URL='staging.mysite.com'
-p 80:80
--link redis:redis
--name container_name dockerhub_id/image_name
Or, if you don't want to have the value on the command-line where it will be displayed by ps
, etc., -e
can pull in the value from the current environment if you just give it without the =
:
sudo PASSWORD='foo' docker run [...] -e PASSWORD [...]
If you have many environment variables and especially if they're meant to be secret, you can use an env-file:
$ docker run --env-file ./env.list ubuntu bash
The --env-file flag takes a filename as an argument and expects each line to be in the VAR=VAL format, mimicking the argument passed to --env. Comment lines need only be prefixed with #
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