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Asked: 2020-10-09 15:26:25 +0800 CST

kdump not saving to /var/crash on Centos 8.1 server

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I am trying to test the kernel dump using echo 1 > /proc/sys/kernel/sysrq ; echo c > /proc/sysrq-trigger command. On some servers, I can get the dump and on some servers I don't see anything. The kdump config is the same across the fleet and it is writing to the local /var/crash directory. When I trigger the crash manually and check the console, the server straight away goes to reboot without saving the dump. Is there any memory issue that is preventing the kdump from saving the core?

linux centos memory centos8 kdump

1 Answers

  1. kdump must be "armed" via a specific kdump service; please check that the service was correctly started by issuing systemctl status kdump.

    In your logs (/var/log/messages) check for similar entries:

    systemd[1]: Starting Crash recovery kernel arming...
kdumpctl[542051]: kexec: loaded kdump kernel
kdumpctl[542051]: Starting kdump: [OK]
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