How to find environment variables in docker

How to find environment variables in a Docker container: Print variables directly: Use the echo $ENV_VARIABLE_NAME command to output variables directly. Use the env command: Output all environment variables and values ​​in the container. Use the inspect command: Get the container configuration that contains a list of environment variables.

How to find environment variables in Docker

Print variables directly

The easiest way is to print environment variables directly in the container:

<code>echo $ENV_VARIABLE_NAME</code>

For example:

<code>docker run --rm alpine echo $HOME</code>

Use the env command

The env command lists all environment variables and values:

<code>docker run --rm alpine env</code>

Output:

<code>TERM=xterm-256color SHELL=/bin/sh PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin HOME=/root</code>

Use the inspect command

docker inspect command can be used to get the container configuration, which contains a list of environment variables:

<code>docker inspect --format '{{json .Config.Env}}' CONTAINER_ID</code>

Output:

<code>["HOME=/root", "PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin", "TERM=xterm-256color"]</code>

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