Hi all,
as some of you saw in the last two weeks I've faced some problems in
configuring a Corosync/Pacemaker cluster on two Hetzner server.
The main problem about those cheap and very powerful servers is their
network management. For example, if you want to have a failover IP you
need to manage it by the web interface or via a webservice, there's no
other way.
Luckily, the guys from Kumina
(http://blog.kumina.nl/2011/02/hetzner-failover-ip-ocf-script/) wrote an
ocf resource agent that automates the management of the IP so the last
(but not least) problem was the Stonith.
In the intention of Hetzner the only way you have to force a reset of
the machine is... via the same webserver. I know, it's odd, but also in
this case it is the only way. So, following those directives:
http://wiki.hetzner.de/index.php/Robot_Webservice_en I wrote the stonith
agent that is attached to this email.
It is based upon the same configuration file of the Kumina's ocf:
# cat /etc/hetzner.cfg
[dummy]
user = <username>
pass = <password>
local_ip = <local ip address of the server>
And it needs two parameters: the "hostname" and it's related
"remote_ip", for example:
primitive stonith_hserver-1 stonith:external/hetzner \
params hostname="hserver-1" remote_ip="X.Y.Z.G" \
op start interval="0" timeout="60s
First of all, it works. The system is able to fence nodes in case of
split brain and manually, so I can say it is ok. But it is the first
stonith agent that I wrote, so it may need some corrections.
Hope this can help someone. Thanks to andreask who helped me on irc in
understanding how stonith agents works.
--
RaSca
Mia Mamma Usa Linux: Niente รจ impossibile da capire, se lo spieghi bene!
ra...@miamammausalinux.org
http://www.miamammausalinux.org
#!/bin/sh
#
# External STONITH module for Hetzner.
#
# Copyright (c) 2011 MMUL S.a.S. - Raoul Scarazzini <ra...@mmul.it>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of version 2 of the GNU General Public License as
# published by the Free Software Foundation.
#
# This program is distributed in the hope that it would be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
#
# Further, this software is distributed without any warranty that it is
# free of the rightful claim of any third person regarding infringement
# or the like. Any license provided herein, whether implied or
# otherwise, applies only to this software file. Patent licenses, if
# any, provided herein do not apply to combinations of this program with
# other software, or any other product whatsoever.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write the Free Software Foundation,
# Inc., 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
#
# Read parameters
conf_file="/etc/hetzner.cfg"
user=`cat /etc/hetzner.cfg | egrep "^user.*=" | sed 's/^user.*=\ *//g'`
pass=`cat /etc/hetzner.cfg | egrep "^pass.*=" | sed 's/^pass.*=\ *//g'`
hetzner_server="https://robot-ws.your-server.de";
is_host_up() {
if [ "$1" != "" ]
then
status=`curl -s -u $user:$pass $hetzner_server/server/$1 | sed
's/.*status\":"\([A-Za-z]*\)",.*/\1/g'`
if [ "$status" = "ready" ]
then
return 0
else
return 1
fi
else
return 1
fi
}
case $1 in
gethosts)
echo $hostname
exit 0
;;
on)
# Can't really be implemented because Hetzner webservice cannot power
on a system
exit 1
;;
off)
# Can't really be implemented because Hetzner webservice cannot power
on a system
exit 1
;;
reset)
status=`curl -s -u $user:$pass $hetzner_server/reset/$remote_ip -d
type=hw`
if [ "$status" = "" ]
then
exit 1
else
if is_host_up "$hostaddress"
then
exit 1
else
exit 0
fi
fi
exit 1
;;
status)
if [ "$remote_ip" != "" ]
then
if is_host_up "$remote_ip"
then
exit 0
else
exit 1
fi
else
# Check if we can contact the server
status=`curl -s -u $user:$pass $hetzner_server/server/`
if [ "$status" = "" ]
then
exit 1
else
exit 0
fi
fi
;;
getconfignames)
echo "hostname"
exit 0
;;
getinfo-devid)
echo "Hetzner STONITH device"
exit 0
;;
getinfo-devname)
echo "Hetzner STONITH external device"
exit 0
;;
getinfo-devdescr)
echo "Hetzner host reset"
echo "Manages the remote webservice for reset a remote server."
exit 0
;;
getinfo-devurl)
echo "http://wiki.hetzner.de/index.php/Robot_Webservice_en";
exit 0
;;
getinfo-xml)
cat << HETZNERXML
<parameters>
<parameter name="hostname" unique="1">
<content type="string" />
<shortdesc lang="en">
Hostname
</shortdesc>
<longdesc lang="en">
The name of the host to be managed by this STONITH device.
</longdesc>
</parameter>
<parameter name="remote_ip" unique="1" required="1">
<content type="string" />
<shortdesc lang="en">
Remote IP
</shortdesc>
<longdesc lang="en">
The address of the remote IP that manages this server.
</longdesc>
</parameter>
</parameters>
HETZNERXML
exit 0
;;
*)
exit 1
;;
esac
_______________________________________________
Linux-HA mailing list
Linux-HA@lists.linux-ha.org
http://lists.linux-ha.org/mailman/listinfo/linux-ha
See also: http://linux-ha.org/ReportingProblems
