By Igor Ljubuncic aka Dedoimedo
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Extra info for Linux Kernel Crash Book Everything you need to know
If defines the runlevel into which the crash kernel should boot. If you want Kdump to save crash dumps only to a local device, you can set the runlevel to 1. If you want Kdump to save dumps to a network storage area, like NFS, CIFS or FTP, you need the network functionality, which means the runlevel should be set to 3. You can also use 2, 5 and s. If you opt for runlevel 5 (not recommended), make sure the crash kernel has enough memory to boot into the graphical environment. The default 64MB is most likely insufficient.
You will have to edit the GRUB configuration file, reboot and try again. Once you do it properly, Kdump should start without any errors.
Nothing decisive, so trial is your best choice here. We’ll discuss this some more later on. 5 Configure KDUMP_RUNLEVEL This is another important directive. If defines the runlevel into which the crash kernel should boot. If you want Kdump to save crash dumps only to a local device, you can set the runlevel to 1. If you want Kdump to save dumps to a network storage area, like NFS, CIFS or FTP, you need the network functionality, which means the runlevel should be set to 3. You can also use 2, 5 and s.