I have installed Magento 2 while also playing with Docker dev environment. I have a problem logging into Magento2 admin panel.

After I enter the correct username and password, I am being redirected back to the login screen, but the URL changes to http://magento2.dev.local/admin_m11a7k/admin/dashboard/index/key/2481eca5d84c964ff31e222ca50c85d68593dfbbf0ed086af8082bd5c8c6a932/

var/session looks like this after trying to log in:

-rw------- 1 wjarka www-data 0 5 lis 17:52 sess_125312a61b14e31b5d0857a1e30b80d2

-rw------- 1 wjarka www-data 0 5 lis 17:52 sess_feb318bcf09cf6fc012e37ac72813f46

Session files are empty, so I guess this is some kind permissions problem? Looks like it's creating the files in a way that it's not able to read it later? It probably should be www-data:www-data, right? And for some reason it uses wjarka:www-data.

PHP-FPM runs as www-data, so that's... weird. Anything I might be missing?

I am using Docker containers for php 5.6-fpm and apache 2.4 from official repos.

UPDATE #1 It seems like I know a workaround, but I am still looking for a permanent fix.

Based on this: https://github.com/magento/magento2-docker/blob/master/etc/php-fpm.conf/www.conf

I have moved the session storage to a directory owned by www-data and that is in the container (and not shared through NFS). That worked just fine!

Then I tried to create a new dir on my local filesystem that would be owned by www-data:www-data (33:33). And share my local dir with the docker container in the new path. And then it fails.

So it seems like NFS sharing is messing it up.

1 Answer 1


Are you using usermod in your Dockerfile? This maps your host username (uid 501/1000) to use it as www-data in the Docker container.


RUN usermod -u 501 www-data


RUN usermod -u 1000 www-data
  • I used it before. As far as I remember, while debugging, I tried to run this through docker exec and restart the container. Will check again when I get to my laptop. Nov 7, 2015 at 12:30
  • Thanks for pointing me in the right direction. Reenabled it and it works. Lesson learnt ;) Nov 7, 2015 at 14:19

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