Attachment 8041 Details for Bug 25918

UCS kdump v2

25918_kexec-crash (text/plain), 4.88 KB, created by Philipp Hahn on 2016-09-28 12:35 CEST

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Creator: Philipp Hahn

Created: 2016-09-28 12:35 CEST

Size: 4.88 KB

patch

obsolete

>#!/bin/bash
>set -e -x -u
>
>main () {
>	parse_args "$@"
>	if [ "$CRASHHOSTNAME" = "$(hostname -f)" ]
>	then
>		setup_collector
>	else
>		setup_crash_kernel
>	fi
>}
>
>parse_args () {
>	CRASHHOSTNAME=${1:?FQDN of crash capture host}
>	craship=$(dig +short +search "$CRASHHOSTNAME")
>	dev=$(ip route get "$craship" | sed -rne 's,.* dev (\w+) +src .*,\1,p')
>	driver=$(basename "$(readlink /sys/class/net/eth0/device/driver)")
>}
>
>setup_collector () {
>	# Create user and service for collecting data from the network:
>	adduser --system crash --home /var/lib/crash
>
>	create_file /var/lib/crash/collector.sh <<'__SH__'
>#!/bin/sh
>umask 0177
>exec cat >/var/lib/crash/core-$(date +%%s).gz
>__SH__
>	update-inetd --add '666\tstream\ttcp\tnowait\tcrash\t/var/lib/crash/collector.sh'
>
>	# Make sure the port is allowed by the firewall:
>	ucr set security/packetfilter/tcp/666/all=ACCEPT
>	service univention-firewall restart
>}
>
>setup_crash_kernel () {
>	install_kexec
>	create_initramfs_hook
>	create_initramfs_modules
>	create_initramfs_script
>	create_initramfs
>	setup_grub
>	setup_kernel
>	setup_boot
>	finish
>}
>install_kexec () {
>	which kexec >/dev/null 2>/dev/null && return
>	ucr set repository/online/unmaintained=yes
>	apt-get -qq update
>	apt-get -qq install kexec-tools
>}
>create_initramfs_hook () {
>	create_file /etc/initramfs-tools/hooks/crash <<'__SH__'
>#!/bin/sh
>PREREQ=
>prereqs () {
>echo "$PREREQ"
>}
>case "$1" in
>prereqs)
> prereqs
> exit 0
> ;;
>esac
>. /usr/share/initramfs-tools/hook-functions
>copy_exec /bin/ip
>copy_exec /bin/nc
>__SH__
>}
>create_initramfs_modules () {
>	grep -qFe "$driver" /etc/initramfs-tools/modules && return
>	echo "$driver" >>/etc/initramfs-tools/modules
>	update_initramfs=true
>}
>create_initramfs_script () {
>	create_file /etc/initramfs-tools/scripts/crash <<__SH__
>#!/bin/sh
>trap 'sh </dev/console >/dev/console 2>/dev/console' EXIT
>echo "Loading network driver '$driver'..."
>modprobe "$driver"
>echo "Configuring network interface '$dev'..."
>ip addr add "$(ip addr show dev "$dev" | sed -rne 's,^.*inet ([0-9./]+) brd.*,\1,p')" dev "$dev"
>ip link set "$dev" up
>ip route add default via "$(ip route list | sed -rne 's,^default via ([0-9./]+) dev .*,\1,p')"
>echo "Dumping crash to '$craship'..."
>gzip -c </proc/vmcore | nc "$craship" 666
>echo "Done. Rebooting..."
>sleep 10
>echo b >/proc/sysrq-trigger
>__SH__
>}
>create_initramfs () {
>	"$update_initramfs" || return
>	# kernel + initramfs + uncompressed <= 128 MB !
>	ucr set initramfs/modules=dep
>	update-initramfs -u
>}
>setup_grub () {
>	grub=$(ucr get grub/append)
>	case "$grub" in
>	*crashkernel=*) ;;
>	*) ucr set grub/append="$grub crashkernel=128M" ;; # 384M-2G:64M,2G-:128M
>	esac
>}
>setup_kernel () {
>	create_file /etc/sysctl.d/crash.conf 0644 <<__CONF__
>kernel.hung_task_panic=0          # panic when hung task is detected
>kernel.panic_on_io_nmi=0          # panic on NMIs from I/O
>kernel.panic_on_oops=1            # panic on oops or kernel bug detection
>kernel.panic_on_unrecovered_nmi=1 # panic on NMIs from memory or unknown
>kernel.softlockup_panic=0         # panic when soft lockups are detected
>vm.panic_on_oom=0                 # panic when out-of-memory happens
>__CONF__
>}
>setup_boot () {
>	create_file /etc/rc.local '' FORCE <<'__SH__'
>#!/bin/sh -e
>#
># rc.local
>#
># This script is executed at the end of each multiuser runlevel.
># Make sure that the script will "exit 0" on success or any other
># value on error.
>#
># In order to enable or disable this script just change the execution
># bits.
>#
># By default this script does nothing.
>
>load_crash () {
>	[ "$(cat /sys/kernel/kexec_crash_loaded)" = 0 ] || return
>	console=--reset-vga
>	args='1 irqpoll maxcpus=1 reset_devices boot=crash debug break=init nosplash'
>	set -- $(cat /proc/cmdline)
>	while [ $# -ge 1 ]
>	do
>		case "$1" in
>		blacklist=*) args="${args} $1" ;;
>		boot=*) ;;
>		BOOTIF=*) args="${args} $1" ;;
>		BOOT_IMAGE=*) ;;
>		break|break=*) ;;
>		console=ttyS*) args="${args} $1" console=--console-serial ;;
>		console=*) args="${args} $1" ;;
>		crashkernel=*) ;;
>		drop_capabilities=*) ;;
>		fastboot|forcefsck|fsckfix) ;;
>		loglevel=*) args="${args} $1" ;;
>		netconsole=*) args="${args} $1" ;;
>		nfsroot=*|ip=*) ;;
>		panic=*) ;;
>		quiet|verbose|debug|debug=*) ;;
>		resume=*|resume_offset=*|noresume) ;;
>		root=*|rootflags=*|rootfstype=*|rootdelay=*) ;;
>		ro|rw) ;;
>		splash|nosplash) ;;
>		*) echo "Unknown arg '$1'" ;;
>		esac
>		shift
>	done
>
>	kexec -p /boot/vmlinuz-`uname -r` --initrd /boot/initrd.img-`uname -r` --append="$args" $console
>	cat /sys/kernel/kexec_crash_loaded
>}
>load_crash
>:
>__SH__
>}
>finish () {
>	if [ "$(cat /sys/kernel/kexec_crash_size)" = 0 ]
>	then
>		echo "Now 'reboot'; after that test with 'echo c >/proc/sysrq-trigger'"
>	else
>		if [ "$(cat /sys/kernel/kexec_crash_loaded)" != 0 ]
>		then
>			kexec -p -u
>		fi
>		/etc/rc.local
>		echo "Test with 'echo c >/proc/sysrq-trigger'"
>	fi
>}
>
>update_initramfs=false
>create_file () {
>	[ -z "${3:-}" ] && [ -f "$1" ] && return 0
>	cat >"$1"
>	chmod "${2:-0755}" "$1"
>	case "$1" in
>	*/initramfs-tools/*) update_initramfs=true ;;
>	esac
>}
>
>main "$@"

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