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|
#!/bin/sh
#
# External STONITH module for Xen Dom0 through ssh.
#
# Description: Uses Xen Dom0 Domain as a STONITH device
# to control DomUs.
#
#
# Author: Serge Dubrouski (sergeyfd@gmail.com)
# Inspired by Lars Marowsky-Bree's external/ssh agent.
#
# Copyright 2007 Serge Dubrouski <sergeyfd@gmail.com>
# License: GNU General Public License (GPL)
#
STOP_COMMAND="xm destroy"
START_COMMAND="xm create"
DUMP_COMMAND="xm dump-core"
DEFAULT_XEN_DIR="/etc/xen"
SSH_COMMAND="/usr/bin/ssh -q -x -n"
# Rewrite the hostlist to accept "," as a delimeter for hostnames too.
hostlist=`echo $hostlist | tr ',' ' '`
CheckIfDead() {
for j in 1 2 3 4 5
do
if ! ping -w1 -c1 "$1" >/dev/null 2>&1
then
return 0
fi
sleep 1
done
return 1
}
CheckHostList() {
if [ "x" = "x$hostlist" ]
then
ha_log.sh err "hostlist isn't set"
exit 1
fi
}
CheckDom0() {
if [ "x" = "x$dom0" ]
then
ha_log.sh err "dom0 isn't set"
exit 1
fi
}
RunCommand() {
CheckHostList
CheckDom0
for h in $hostlist
do
CIFS=$IFS
IFS=:
read node cfg << -!
$h
-!
IFS=$CIFS
if [ "x" = "x$node" ]
then
ha_log.sh err "Syntax error in host list"
exit 1
fi
if [ "x" = "x$cfg" ]
then
cfg="${DEFAULT_XEN_DIR}/${node}.cfg"
fi
if [ "$node" != "$1" ]
then
continue
fi
case $2 in
stop)
kill_node=`$SSH_COMMAND $dom0 "grep ^[[:space:]]*name $cfg" | cut -f 2 -d '=' | sed -e 's,",,g'`
if [ "x" = "x$kill_node" ]
then
ha_log.sh err "Couldn't find a node name to stop"
exit 1
fi
if [ "x$run_dump" != "x" ]
then
#Need to run core dump
if [ "x$dump_dir" != "x" ]
then
#Dump with the specified core file
TIMESTAMP=`date +%Y-%m%d-%H%M.%S`
DOMAINNAME=`printf "%s" $kill_node`
COREFILE=$dump_dir/$TIMESTAMP-$DOMAINNAME.core
$SSH_COMMAND $dom0 "(mkdir -p $dump_dir; $DUMP_COMMAND $kill_node $COREFILE) >/dev/null 2>&1"
else
$SSH_COMMAND $dom0 "$DUMP_COMMAND $kill_node >/dev/null 2>&1"
fi
fi
$SSH_COMMAND $dom0 "(sleep 2; $STOP_COMMAND $kill_node) >/dev/null 2>&1 &"
break;;
start)
$SSH_COMMAND $dom0 "(sleep 2; $START_COMMAND $cfg) >/dev/null 2>&1 &"
break;;
esac
exit 0
done
}
# Main code
case $1 in
gethosts)
CheckHostList
for h in $hostlist ; do
CIFS=$IFS
IFS=:
read node cfg << -!
$h
-!
IFS=$CIFS
echo $node
done
exit 0
;;
on)
RunCommand $2 start
exit $?
;;
off)
if RunCommand $2 stop
then
if CheckIfDead $2
then
exit 0
fi
fi
exit 1
;;
reset)
RunCommand $2 stop
if CheckIfDead $2
then
RunCommand $2 start
exit 0
fi
exit 1
;;
status)
CheckHostList
for h in $hostlist
do
CIFS=$IFS
IFS=:
read node cfg << -!
$h
-!
IFS=$CIFS
echo $node
if ping -w1 -c1 "$node" 2>&1 | grep "unknown host"
then
exit 1
fi
done
exit 0
;;
getconfignames)
echo "hostlist dom0"
exit 0
;;
getinfo-devid)
echo "xen0 STONITH device"
exit 0
;;
getinfo-devname)
echo "xen0 STONITH external device"
exit 0
;;
getinfo-devdescr)
echo "ssh-based host reset for Xen DomU trough Dom0"
echo "Fine for testing, but not really suitable for production!"
exit 0
;;
getinfo-devurl)
echo "http://openssh.org http://www.xensource.com/ http://linux-ha.org/wiki"
exit 0
;;
getinfo-xml)
cat << SSHXML
<parameters>
<parameter name="hostlist" unique="1" required="1">
<content type="string" />
<shortdesc lang="en">
Hostlist
</shortdesc>
<longdesc lang="en">
The list of controlled nodes in a format node[:config_file].
For example: "node1:/opt/xen/node1.cfg node2"
If config file isn't set it defaults to /etc/xen/{node_name}.cfg
</longdesc>
</parameter>
<parameter name="dom0" unique="1" required="1">
<content type="string" />
<shortdesc lang="en">
Dom0
</shortdesc>
<longdesc lang="en">
Name of the Dom0 Xen node. Root user shall be able to ssh to that node.
</longdesc>
</parameter>
<parameter name="run_dump" unique="0" required="0">
<content type="string" />
<shortdesc lang="en">
Run dump-core
</shortdesc>
<longdesc lang="en">
If set plugin will call "xm dump-core" before killing DomU
</longdesc>
</parameter>
<parameter name="dump_dir" unique="1" required="0">
<content type="string" />
<shortdesc lang="en">
Run dump-core with the specified directory
</shortdesc>
<longdesc lang="en">
This parameter can indicate the dump destination.
Should be set as a full path format, ex.) "/var/log/dump"
The above example would dump the core, like;
/var/log/dump/2009-0316-1403.37-domU.core
</longdesc>
</parameter>
</parameters>
SSHXML
exit 0
;;
*)
exit 1
;;
esac
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