Hi,
I made the STONITH plug-in that can be used by both Xen and KVM.
I would like to hear any opinion.
Best regards,
Yasumasa OZAKI
#!/bin/sh
#
# External STONITH module for Xen/KVM hypervisor through ssh.
# Uses Xen/KVM hypervisor as a STONITH device to control guest.
#
# Copyright (c) 2010 NIPPON TELEGRAPH AND TELEPHONE CORPORATION
#
STOP_COMMAND="virsh destroy"
START_COMMAND="virsh start"
DUMP_COMMAND="virsh dump"
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
}
CheckHypervisor() {
if [ "x" = "x$hypervisor" ]
then
ha_log.sh err "hypervisor isn't set"
exit 1
fi
}
RunCommand() {
CheckHostList
CheckHypervisor
for node in $hostlist
do
if [ "$node" != "$1" ]
then
continue
fi
case $2 in
stop)
if [ "x$run_dump" != "x" ]
then
#Need to run core dump
if [ "x$dump_dir" != "x" ]
then
TIMESTAMP=`date +%Y-%m%d-%H%M.%S`
DOMAINNAME=`printf "%s" $node`
COREFILE=$dump_dir/$TIMESTAMP-$DOMAINNAME.core
#Run core dump
command_result="$($SSH_COMMAND $hypervisor " \
pgrep -f ^virsh_$node >/dev/null 2>&1; \
if [ \$? = 0 ]; then echo RUNNING; exit; fi; \
mkdir -p $dump_dir; \
if [ \$? != 0 ]; then echo MKDIR_FAILED; exit; fi; \
(exec -a virsh_$node $DUMP_COMMAND $node $COREFILE >/dev/null 2>&1); \
if [ \$? != 0 ]; then echo DUMP_FAILED; exit; fi; \
echo OK")"
ssh_result=$?
if [ $ssh_result = 0 ]
then
case "$command_result" in
RUNNING)
ha_log.sh info "Dump is already running"
exit 0
;;
SUSPEND_FAILED)
ha_log.sh err "Failed to suspend domain
$node"
;;
MKDIR_FAILED)
ha_log.sh err "Failed to create directory
$dump_dir"
;;
DUMP_FAILED)
ha_log.sh err "Failed to core dump domain
$node to $COREFILE"
;;
OK)
ha_log.sh notice "Domain $node dumped to
$COREFILE"
;;
esac
else
ha_log.sh err "Couldn't connect to hypervisor
$hypervisor"
fi
else
ha_log.sh err "dump_dir isn't set"
fi
fi
command_result=$($SSH_COMMAND $hypervisor "((sleep 2;
$STOP_COMMAND $node) >/dev/null 2>&1 &); echo \$?")
ssh_result=$?
if [ $ssh_result = 0 ]
then
if [ $command_result = 0 ]
then
ha_log.sh notice "Domain $node is stoped"
else
ha_log.sh err "Failed to stop domain $node"
fi
else
ha_log.sh err "Couldn't connect to hypervisor $hypervisor"
fi
break;;
start)
command_result=$($SSH_COMMAND $hypervisor "((sleep 2;
$START_COMMAND $node) >/dev/null 2>&1 &); echo \$?")
ssh_result=$?
if [ $ssh_result = 0 ]
then
if [ $command_result = 0 ]
then
ha_log.sh notice "Domain $node is started"
else
ha_log.sh err "Failed to start domain $node"
fi
else
ha_log.sh err "Couldn't connect to hypervisor $hypervisor"
fi
break;;
esac
exit 0
done
}
# Main code
case $1 in
gethosts)
CheckHostList
for node in $hostlist ; do
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)
exit 0
;;
getconfignames)
echo "hostlist hypervisor"
exit 0
;;
getinfo-devid)
echo "virsh STONITH device"
exit 0
;;
getinfo-devname)
echo "virsh STONITH external device"
exit 0
;;
getinfo-devdescr)
echo "ssh-based Linux host reset for Xen/KVM guest domain trough hypervisor"
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.
For example: "node1 node2"
</longdesc>
</parameter>
<parameter name="hypervisor" unique="1" required="1">
<content type="string" />
<shortdesc lang="en">
Hypervisor hostname
</shortdesc>
<longdesc lang="en">
Host name to execute hypervisor. 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 core dump
</shortdesc>
<longdesc lang="en">
If set plugin will call "virsh dump" before killing guest domain
</longdesc>
</parameter>
<parameter name="dump_dir" unique="1" required="0">
<content type="string" />
<shortdesc lang="en">
Run dump core with the specified directory
When the "run_dump" parameter is set, this parameter is indispensable
</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-GuestDomain.core
</longdesc>
</parameter>
</parameters>
SSHXML
exit 0
;;
*)
exit 1
;;
esac
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