How to disable core file dumps in docker container

Question

My PHP container runs puppeteer to generate PDF. By generating a PDF document, it also creates two core dump files inside my container. I am not sure where they actually com

Answer 1

You have to start your container with the option --ulimit core=0 to disable coredumps.

Reference: https://docs.docker.com/engine/reference/commandline/run/#set-ulimits-in-container---ulimit

Example

On the host, temporarily set the coredump path to /tmp for verification:

echo '/tmp/core.%e.%p' | sudo tee /proc/sys/kernel/core_pattern

Start a container as usual and force a core dump:

docker run --rm -it bash
(inside the container)
# yes > /dev/null &
# kill -SIGABRT $(pidof yes)
# ls /tmp
(shows core.yes.)

Now, with --ulimit core=0:

docker run --ulimit core=0 --rm -it bash
(inside the container)
# yes > /dev/null &
# kill -SIGABRT $(pidof yes)
# ls /tmp
(No entries)