How to check environment variables by docker

How to view environment variables in Docker containers

Docker containers are lightweight virtual environments for isolating and packaging applications and dependencies. It provides a range of environment variables for configuring and controlling the runtime behavior of the container.

To view environment variables in a Docker container, you can use the following steps:

1. Get the container ID

 <code>docker ps -a</code>

This command lists all running and stopped containers. Find the container ID of the environment variable to be checked.

2. View environment variables

You can view the environment variables of the container through the following command:

 <code>docker inspect -f '{{json .Config.Env}}' <container-id></container-id></code>

Where <container-id></container-id> is the container ID obtained in step 1.

This command outputs a JSON object containing a list of environment variables for the container. The format of the JSON object is as follows:

 <code>[ "KEY1=VALUE1", "KEY2=VALUE2", ... ]</code>

where KEY is the name of the environment variable and VALUE is its value.

Example

For example, to view environment variables in a container named "my-container", you can run the following command:

 <code>docker inspect -f '{{json .Config.Env}}' my-container</code>

This outputs a JSON object similar to:

 <code>[ "PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin", "USER=my-user", ... ]</code>

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