How to setting Core file size in Docker container?

docker coredump limits ulimit dockerfile
leeyc picture leeyc · Feb 4, 2015 · Viewed 9.6k times · Source

I want to set core file size to unlimited in a Docker container.

I tried changing limits.conf in container.

Dockerfile

RUN sed -i.bak '/\# End of file/ i\\* soft core unlimited' /etc/security/limits.conf
RUN sed -i.bak '/\# End of file/ i\\* hard core unlimited' /etc/security/limits.conf

I restarted the container but that didn't work.

Core file size is always 0.

I can use the command 

$ ulimit -c unlimited

for setting core file size. But I have to use the command for another application. So I don't want us these commands.

Please let me know how I can change the core file size in a Docker container.

Answer

cpuguy83 picture cpuguy83 · Sep 30, 2015

You can set the limits on the container on docker run with the --ulimit flag.

docker run --ulimit core=<size> ...

Note that "unlimited" is not a supported value since it is not actually a real value, but -1 is equivalent to it:

$ docker run -it --ulimit core=-1 ubuntu:18.04 sh -c 'ulimit -a | grep core'
coredump(blocks)     unlimited
~ $

Related questions

how to generate core file in docker container?

using ulimit command, i set core file size. ulimit -c unlimited and I compiled c source code using gcc - g option. then a.out generated. after command ./a.out there is runtime error . (core dumped) but core file was …

Read More
How to get a Docker container's IP address from the host

Is there a command I can run to get the container's IP address right from the host after a new container is created? Basically, once Docker creates the container, I want to roll my own code deployment and container configuration …

Read More
How to copy files from host to Docker container?

I am trying to build a backup and restore solution for the Docker containers that we work with. I have Docker base image that I have created, ubuntu:base, and do not want have to rebuild it each time with …

Read More