PHP: Get Container ID in Docker Container

Question

How can I get the Docker container ID within the container itself using PHP?

I just found linux commands as here:

DOCKER_CID=$(cat /proc/1/cpuset | cut -c9-)

Check https://stackoverflow.com/questions/20995351/docker-how-to-get-container-information-from-within-the-container — Nigel Ren, Feb 05 '19 at 10:01

score 6 · Answer 1 · answered Feb 05 '19 at 10:05

6

You can use get_env() to get environment variables of the system.

if after running echo $DOCKER_CID in the CLI you get the ID you can then use this code in your PHP:

$docker_cid = getenv('DOCKER_CID');

answered Feb 05 '19 at 10:05

Marcin

1

Ok, but this solution requires to set the env-Variable first :-( – WeSee Feb 05 '19 at 15:24

score 1 · Answer 2 · answered May 14 '20 at 09:08

Everyone's answers combined means that after running the following command in the cotainer:

DOCKER_CID=$(cat /proc/1/cpuset | cut -c9-)

You are able to get the id using:

$docker_cid = getenv('DOCKER_CID');

If you don't know how to run that command in a container, here are some options:

Run it using: docker exec -it <containerId> /bin/bash
Make a PHP script: exec('DOCKER_CID=$(cat /proc/1/cpuset | cut -c9-)'); (I don't recommend that, but if someone uses this, make sure it's secure.)

Credits to Marcin, who already answered it, but maybe not clear enough.

2 Answers2