Attachment 9219 Details for Bug 25918

UCS kdump v6

25918_kexec-crash (text/plain), 7.36 KB, created by Philipp Hahn on 2017-09-18 17:22 CEST

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Creator: Philipp Hahn

Created: 2017-09-18 17:22 CEST

Size: 7.36 KB

patch

obsolete

>#!/bin/bash
>set -e -u
>
>SELF="${0##*/}"
>
>mode='crash_kernel'
>address=
>port='666'
>interface=
>driver=
>output='/var/lib/crash'
>size='128M'
>
>main () {
>	parse_args "$@"
>	"setup_${mode}"
>}
>
>parse_args () {
>	local temp
>	temp="$(getopt -n "$SELF" -o 'hca:p:i:d:o:s:v' -l 'help,collector,address:,port:,interface:,driver:,output:,size:,verbose' -- "$@")" ||
>		die "Terminating"
>	eval set -- "$temp"
>	while [ -n "$1" ]
>	do
>		case "$1" in
>			-h|--help) usage 0 ;;
>			-c|--collector) mode='collector' ; shift ;;
>			-a|--address) address="$2" ; shift 2 ;;
>			-p|--port) port="$2" ; shift 2 ;;
>			-i|--interface) interface="$2" ; shift 2 ;;
>			-d|--driver) interface="$2" ; shift 2 ;;
>			-o|--output) output="$2" ; shift 2 ;;
>			-s|--size) size="$2" ; shift 2 ;;
>			-v|--verbose) set -x ; shift ;;
>			--) shift ; break ;;
>			*) die "Internal error!" ;;
>		esac
>	done
>	CRASHHOSTNAME="${1:-}"
>}
>usage () {
>	echo "Usage: $SELF [options] (--collector | <FQDN-of-crash-capture-host>)"
>	echo " Either setup host as crash collector, which installs a service listening for incoming connections,"
>	echo " or setup local host to send memory dumps on crashes to given host."
>	echo
>	echo "Options:"
>	echo " -c, --collector"
>	echo " -o, --output <output-directory> [default: '${output}']"
>	echo
>	echo " -a, --address <IP-address>"
>	echo " -i, --interface <network-interface>"
>	echo " -d, --driver <network-driver>"
>	echo " -s, --size <reserved-memory> [default: '${size}']"
>	echo
>	echo " -p, --port <TCP-port> [default: '${port}']"
>	echo " -v, --verbose"
>	echo " -h, --help"
>	exit ${1:-0}
>}
>
>setup_collector () {
>	echo "Setting up as crash collector..."
>	# Create user and service for collecting data from the network:
>	adduser --system crash --home /var/lib/crash
>
>	create_file "${output}/collector.sh" <<__SH__
>#!/bin/sh
>umask 0177
>exec cat >"${output}/core-\$(date +%s).gz"
>__SH__
>	update-inetd --add "${port}\tstream\ttcp\tnowait\tcrash\t${output}/collector.sh"
>
>	# Make sure the port is allowed by the firewall:
>	ucr set "security/packetfilter/tcp/${port}/all=ACCEPT"
>	service univention-firewall restart
>}
>
>setup_crash_kernel () {
>	echo "Setting up crash kernel..."
>	detect_hypervisor
>	detect_network
>	install_kexec
>	create_initramfs_hook
>	create_initramfs_modules
>	create_initramfs_script
>	create_initramfs
>	setup_grub
>	setup_kernel
>	setup_boot
>	finish
>}
>detect_hypervisor () {
>	local hypervisor="$(cat /sys/hypervisor/type 2>/dev/null || :)"
>	echo "Hypervisor: $hypervisor"
>	case "$hypervisor" in
>	xen) [ -n "${FORCE_XEN:-}" ] || die "Xen is not supported. (Xen implements its own mechanism to capture crashed domains. Support for kexec was only added later. If you want to try anyway, set FORCE_XEN=1)" ;;
>	esac
>}
>detect_network () {
>	[ -n "$CRASHHOSTNAME" ] || die "Missing address"
>	: ${address:=$(dig +short +search "$CRASHHOSTNAME" | tail -n 1)}
>	echo " using IP ${address:?Failed to resolve "$CRASHHOSTNAME"}"
>	: ${interface:=$(ip route get "$address" | sed -rne 's,.* dev (\w+) +src .*,\1,p')}
>	echo " using network interface ${interface:?Network interface not found; use -i}"
>	: ${driver:=$(basename "$(readlink "/sys/class/net/$interface/device/driver")")}
>	echo " using network driver ${driver:?Network driver not found; use -d}"
>}
>install_kexec () {
>	which kexec >/dev/null 2>/dev/null && return
>	ucr set repository/online/unmaintained=yes
>	apt-get -qq update
>	apt-get -qq install kexec-tools
>	sed -i -e '/^LOAD_KEXEC=/s/true/false/' /etc/default/kexec
>	kexec -u || :
>}
>create_initramfs_hook () {
>	create_file /etc/initramfs-tools/hooks/crash <<'__SH__'
>#!/bin/sh
>PREREQ=
>prereqs () {
>echo "$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 "$driver" >>/etc/initramfs-tools/modules
>	update_initramfs=true
>}
>create_initramfs_script () {
>	create_file /etc/initramfs-tools/scripts/crash <<__SH__
>#!/bin/sh
>exec >/dev/console 2>/dev/console
>set -x
>trap 'sh </dev/console >/dev/console 2>/dev/console' EXIT
>echo "Loading network driver '$driver'..."
>modprobe "$driver"
>sleep 5
>cd /sys/class/net
>for iface in *
>do
>	echo "Trying network interface '\$iface'..."
>	[ -e "\$iface/device/driver" ] || continue
>	ip addr add "$(ip addr show dev "$interface" | sed -rne 's,^.*inet ([0-9./]+) brd.*,\1,p')" dev "\$iface"
>	ip link set "\$iface" up
>	ip route add default via "$(ip route list | sed -rne 's,^default via ([0-9./]+) dev .*,\1,p')"
>	echo "Dumping crash to '$address'..."
>	gzip -c </proc/vmcore | nc "$address" "$port" && {
>		echo "Done. Rebooting in 3s..."
>		sleep 3
>		echo b >/proc/sysrq-trigger
>		break
>	}
>	echo "Failed."
>	ip addr flush dev "\$iface"
>done
>__SH__
>}
>create_initramfs () {
>	"$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="$grub crashkernel=${size}" ;; # 384M-2G:64M,2G-:128M
>	esac
>	ucr set grub/gfxmode= grub/gfxpayload= grub/bootsplash=nosplash grub/loglevel=7 grub/quiet=no
>}
>setup_kernel () {
>	create_file /etc/sysctl.d/crash.conf 0644 <<__CONF__
># panic when hung task is detected
>kernel.hung_task_panic=0
># panic on NMIs from I/O
>kernel.panic_on_io_nmi=0
># panic on oops or kernel bug detection
>kernel.panic_on_oops=1
># panic on NMIs from memory or unknown
>kernel.panic_on_unrecovered_nmi=1
># panic when soft lockups are detected
>kernel.softlockup_panic=0
># panic when out-of-memory happens
>vm.panic_on_oom=0
>__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 "First '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 "$1" in
>	*/initramfs-tools/*) update_initramfs=true ;;
>	esac
>}
>
>die () {
>	echo "${0##*/}: $*" >&2
>	exit 1
>}
>
>main "$@"

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