mirror of
https://gitlab.alpinelinux.org/alpine/aports.git
synced 2026-04-03 21:02:40 +02:00
88b55b423f
Also improve the init script for memory-tight environment: - ensure other services in the same runlevel aren't started to avoid competing with other processes - make reboot act immediately This helps if the memory given with crashkernel was too tight to run many other processes, and should be mostly harmless in other cases, exception being dumping to a network filesystem and kdump being in the same runlevel, but the current script also required fiddling to make this work in the first place
81 lines
1.9 KiB
Bash
Executable File
81 lines
1.9 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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if [ -e /proc/vmcore ]; then
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# avoid starting unrelated services using up memory in crashkernel
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( cd /etc/init.d && before *; )
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keyword -timeout
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fi
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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 pgrp
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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 "$dest/dmesg"
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einfo "Dump done, rebooting"
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reboot
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# Interrupt parent openrc command by killing current session group
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# This avoids waiting for other services in same runlevel before
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# the reboot is actually processed
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pgrp=$(awk '{ print $6 }' /proc/self/stat)
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if [ -n "$pgrp" ]; then
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kill -SIGTERM -$pgrp
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fi
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eend 0
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}
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start() {
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if [ -e /proc/vmcore ]; then
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start_dump
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else
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start_load
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fi
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}
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_stop() {
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# we're not unloading the module on purpose to allow
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# crashes to work at poweroff
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# add `stop() { _stop; }` in conf.d/kdump to enable
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# not loaded
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kexec -S && return
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ebegin "Unloading crash kernel"
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kexec -p -u
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eend "$?" "Could not unload crash kernel"
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}
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