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https://gitlab.alpinelinux.org/alpine/aports.git
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2a15c351ad
makedumpfile is used to take crash dumps with kexec on panic The actual "load a backup kernel and take the dump" logic isn't that complicated, but unfortunately each distro seems to roll their own: https://github.com/rhkdump/kdump-utils https://tracker.debian.org/pkg/kdump-tools So I just whipped up a minimal example for people to customize instead of doing something proper and checked it dumps in a VM and on a real board after setting up /etc/conf.d/kdump + crashkernel boot param: ``` # vi /etc/conf.d/kdump (set kernel etc) # vi /etc/update-extlinux.conf (add crashkernel= param, set custom kernel as default) # update-extlinux # reboot ... * Loading crash kernel ... [ ok ] ... # echo c > /proc/sysrq-trigger [ 17.876403] sysrq: Trigger a crash ... * Dumping kernel /var/crash/2024-07-17-17:24:15 ... Copying data : [100.0 %] - eta: 0s The dumpfile is saved to /var/crash/2024-07-17-17:24:15/dump. makedumpfile Completed. The dmesg log is saved to /var/crash/2024-07-17-17:24:15/dmesg. makedumpfile Completed. * Dump done, rebooting ... # ls -lh /var/crash/2024-07-17-17:24:15/ total 35M -rw------- 1 root root 32.1K Jul 17 17:24 dmesg -rw------- 1 root root 34.6M Jul 17 17:24 dump ```
68 lines
1.4 KiB
Bash
Executable file
68 lines
1.4 KiB
Bash
Executable file
#!/sbin/openrc-run
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description="Load crash kernel or take dump+reboot"
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: "${cmdline_append:="reset_devices nr_cpus=1"}"
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: "${kexec_args:=}"
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: "${makedumpfile_args:="-z -d 31"}"
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: "${kdump_dir:=/var/crash}"
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depend() {
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after localmount
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}
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start_load() {
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if [ -z "$kexec_args" ]; then
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eerror "Cannot load crash kernel without configuring kexec_args first"
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return 1
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fi
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if ! grep -q crashkernel /proc/cmdline; then
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einfo "Not loading crash kernel because crashkernel not set in cmdline"
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return
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fi
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# if already loaded unload first
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_stop
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ebegin "Loading crash kernel"
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local cmdline
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cmdline="$(cat /proc/cmdline) $cmdline_append"
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# shellcheck disable=SC2086 # allow spliting args
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kexec -p --command-line="$cmdline" $kexec_args
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eend "$?" "Could not load crash kernel"
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}
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start_dump() {
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local dest
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dest="$kdump_dir/$(date +%Y-%m-%d-%T)"
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ebegin "Dumping kernel $dest"
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mkdir -p "$dest"
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# shellcheck disable=SC2086 # allow spliting args
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makedumpfile $makedumpfile_args /proc/vmcore "$dest/dump"
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makedumpfile --dump-dmesg /proc/vmcore "$dest/dmesg"
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einfo "Dump done, rebooting"
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reboot
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eend 0
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}
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start() {
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if [ -e "/proc/vmcore" ]; then
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start_dump
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else
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start_load
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fi
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}
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_stop() {
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# we're not unloading the module on purpose to allow
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# crashes to work at poweroff
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# add `stop() { _stop; }` in conf.d/kdump to enable
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# not loaded
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kexec -S && return
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ebegin "Unloading crash kernel"
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kexec -p -u
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eend "$?" "Could not unload crash kernel"
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}
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