Remove user nproc Limit CentOS 7 Docker image

[centos]

Remove user nproc Limit CentOS 7 Docker image

After some more testings, the nproc ulimit is only applied for users different to the main/start process (entrypoint/cmd) of a container.

When running a container with a specific user no max user processes limit is applied.

$ docker run --rm -it -u operator centos:7 bash -c 'ulimit -u'
unlimited

When running a container and somehow switching the user or running several commands in different users the limit is applied.

$ docker run --rm -it centos:7 su -l operator -s /bin/bash -c 'ulimit -u'
4096

Without the 20-nproc.conf file and switching the user or running several commands in different users no limit is applied.

$ docker run --rm -it centos:7 bash -c \
  "rm /etc/security/limits.d/20-nproc.conf && su -l operator -s /bin/bash -c 'ulimit -u'"
unlimited

Is the default nproc limit of CentOS still useful for containers?

[barelnir]

I have the same issue, ssh is refused and only if I change the number I am able to connect,
Is it OK to remove this file? or it is required?