Docker: docker: Error response from daemon: linux spec user: unable to find user myuser: no matching entries in passwd file

Question

[root@mymachine redisc]# docker run -p 6379:6379 --user myuser redisc
docker: Error response from daemon: linux spec user: unable to find user myuser: no matching entries in passwd file.

but i can become myuser on the host

[root@mymachine redisc]# sudo su myuser
[myuser@mymachine redisc]#

How would i be able to run as myuser in the container?

Answer 1

According to the documentation you can use the ID of the user / group:

When passing a numeric ID, the user does not have to exist in the container.

Source: https://docs.docker.com/engine/reference/run/#user

The command could look like this:

docker run -p 6379:6379 --user 1001 redisc

Answer 2

The host and the container are completely separate. You need to create myuser inside the redisc container before you try and run stuff as that user.