Modify core dump disk space utilization per node

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As per the official man page documentation for coredump.conf, the core dump disk space utilization per node in Kubernetes can be modified by changing the MaxUse section to X%, and by default, it is 10%.

https://man7.org/linux/man-pages/man5/coredump.conf.5.html

I have done the following things :

  • 1st Solution which I tried: Modified /etc/systemd/coredump.conf by removing # before MaxUse and changes it to 20%

    cat /etc/systemd/coredump.conf
MaxUse=20%

    After that, I ran "sudo systemctl daemon-reload" in order to reflect the change but it didn't work.

  • 2nd Solution which I tried : Adding /etc/systemd/coredump.conf.d/custom.conf to override /etc/systemd/coredump.conf. This option was specified here: https://wiki.archlinux.org/index.php/Core_dump

    [Coredump]
MaxUse=20%

    After that, I ran "sudo systemctl daemon-reload" in order to reflect the change but it didn't work. I did multiple cores just to check whether both solutions are working but it didn't work:

    I have core my test application and just to get large cores I have used the below-mentioned command:

    $ sudo dd if=/dev/zero of=abc.xz bs=1024 count=10240000

    While testing this my core dump directory /var/lib/systemd/coredump/ had over 150G of core.

systemd kubernetes linux-kernel coredump linux
1 Answers

Looks like the docs are misleading and say that it defaults to MaxUse to be 10%. But it seems like the systemd code shows that it's parsed in terms of Bytes, Kbytes, Mbytes, etc. You can try something like:

[Coredump]
MaxUse=20G
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