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Show the environment variables of a Docker container

harmless rootDockerdebian, ubuntu
Adjust the values, the command updates live
root@server
docker exec app env

Runs env in the running container and shows the variables as the application actually sees them, including those from environment: or .env of a Compose file. Useful when an application starts with default values despite a variable being set.

Note: The output often contains passwords and API keys, so do not paste it into tickets or chats without checking. Only works with running containers whose image includes env.

Also searched as

  • docker show environment variables
  • check env vars in running container
  • docker exec env

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#docker run --rm -v app_data:/data:ro -v /root/docker-backup:/backup alpine tar czf /backup/app_data.tar.gz -C /data .
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Change the restart policy of a Docker container

#docker update --restart unless-stopped app
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Clean up unused Docker data

#docker system prune
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Copy a file from a Docker container to the host

#docker cp app:/etc/nginx/nginx.conf /root/nginx.conf
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Find unhealthy Docker containers

#docker ps --filter health=unhealthy
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