Editing files in a read-only directory in docker container

Question

I would like to add some Core dump configuration to an Opensips docker container. At present, I am only generating a coredump file with the name "core" (which could be overwritten).

The changes I need to make are:

echo 1 > /proc/sys/kernel/core_uses_pid     --> which generates "core.6645" for example

and

echo 'core.t.sigp' > /proc/sys/kernel/core_pattern     --> This will have the core file contain the process name ( % e ), the timestamp ( % t ), the received signal ( % s ) and the pid file ( % p )

The problem is, the /proc/sys/kernel/ filesystem is Read-Only, so both attempts at editing files gets this error when building the image (I added the above commands to the Dockerfile):

/proc/sys/kernel/core_uses_pid': Read-only file system

Any ideas on how I can get around this issue?

Marcelo Guedes · Accepted Answer · 2022-07-02 07:05:11Z

-1

To solve this, you need create your container with --privileged:

ex.:

docker run --privileged -i --name master --hostname k8s-master -d ubuntu:20.04

answered Jul 2, 2022 at 7:05

Marcelo Guedes

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1 Comment

Mr. Jo Nov 3 at 8:23

This should not be done unless you want to give your Container all the rights on the host system.

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