Hello Andrew,
I can try and fix that if you re-run with -x and paste the output.
(apache-03) [~] crm_report -l /var/adm/syslog/2013/08/05 -f 2013-08-04
18:30:00 -t 2013-08-04 19:15 -x
+ shift
+ true
+ [ ! -z ]
+ break
+ [ x != x ]
+ [ x1375633800 != x ]
+ masterlog=
+ [ -z ]
+ log WARNING:
Hello Andrew,
As I said The cluster only stops doing this if writing to disk fails
at some point - but there would have been an error in your logs if
that were the case.
I grepped in the logs and found out that there was a write error on 15
Juli and probably all changes after that did not
Hello Andrew,
It really helps to read the output of the commands you're running:
Did you not see these messages the first time?
apache-03: WARN: Unknown cluster type: any
apache-03: ERROR: Could not determine the location of your cluster logs, try
specifying --logfile /some/path
Hello Andrew,
Any change to the configuration section is automatically written to
disk. The cluster only stops doing this if writing to disk fails at
some point - but there would have been an error in your logs if that
were the case.
than I do not get it. Yesterday, when the nodes sucided
Hello Andrew,
did they ensure everything was flushed to disk first?
(apache-03) [/var] cat /proc/sys/vm/dirty_expire_centisecs
3000
So dirty data should be flushed within 3 seconds. But I lost at least 24
hours maybe even more. So it seems that pacemaker / heartbeat does not
do persistant
Hello Andrew,
You will need to run crm_report and email us the resulting tarball.
This will include the version of the software you're running and log
files (both system and cluster) - without which we can't do anything.
Find the files here:
I manually packaged it because crm_report output
Hello Ulrich,
Did it happen when you put the cluster into maintenance-mode, or did
it happen after someone fiddled with the resources manually? Or did it
happen when you turned maintenance-mode off again?
I did not remember, but checked the log files, and yes I did a config
change (I removed
Hello Andrew,
I just got another crash when putting a node into unmanaged node, this
time it hit me hard:
- Both nodes sucided or snothined each other
- One out of four md devices where detected on both nodes after
reset.
- Half of the config was gone. Could you
Hello,
both nodes of my ha cluster just paniced, afterwards the config was
gone. Is there a command to force heartbeat / pacemaker to write the
config to the disk or do I need to restart heartbeat for persistant
changes. The config was at least 24 hours on the node, but I did not
restart heatbeat
Hello Andrew,
If you include a crm_report for the scenario you're describing, I can
take a look. The config alone does not contain enough information.
I tried to reproduce that on a Debian Wheezy (7.0) in my lab environment
and was unable to do so. I'll soon setup multiple other platforms and
Hello Mitsuo,
from the output you send, you should update because your heartbeat
version looks very very ancient to me. A resource script for heartbeat
always needs at least these 5 operations:
#!/bin/bash
. ${OCF_ROOT}/resource.d/heartbeat/.ocf-shellfuncs
export PID=/var/run/postgrey.pid
Hello Andrew,
Jun 6 10:17:37 astorage1 crmd: [2947]: ERROR: crm_abort:
abort_transition_graph: Triggered assert at te_utils.c:339 :
transition_graph != NULL
This is the cause of the coredump.
What version of pacemaker is this?
1.1.7-1
Installing pacemaker's debug symbols would also
Hello Fredrik,
* Fredrik Hudner fredrik.hud...@gmail.com [2013-06-07 14:03]:
Been trying to figure out if drbd which is monitored by HA, needs a
restart if you do a configuration change in global_common.conf?
http://www.drbd.org/users-guide/s-reconfigure.html
So you need to issue a 'drbdadm
Hello Andrew,
Installing pacemaker's debug symbols would also make the stack trace
more useful.
we tried to install heartbeat-dev to see more, but there are no
debugging symbols available. Also I tried to reproduce the issue with a
64 bit Debian Wheezy as I used 32 bit before, I was not able
Hello Mitso,
3.0.4-1.el6
from the version I see that you're runing RHEL 6. So RHEL uses corosync
or cman but not heartbeat as messaging bus between the nodes. You can
follow this guide and the links in this guide.
http://clusterlabs.org/quickstart-redhat.html
What is annoying from my point
Hello,
on Debian Wheezy (7.0) I installed pacemaker with heartbeat. When
putting multiple filesystems which depend on multiple drbd promotions,
only the first drbd is promoted and the group never comes up. However
when the promotions are not based on the individual filesystems but on
the group or
Hello,
over the last couple of days, I setup an active passive nfs server and
iSCSI storage using drbd, pacemaker, heartbeat, lio and nfs kernel
server. While testing cluster I was often setting it to unmanaged using:
crm configure property maintenance-mode=true
Sometimes when I did that, both
Hello Emmanuel,
* emmanuel segura emi2f...@gmail.com [2013-06-06 11:12]:
order drbd_fs_after_drbd inf: ma-ms-drbd5:promote ma-ms-drbd8:promote
astorage:start
I can see that you promoted multiple drbds in one line. My config where
I promote them individually also works. However my question,
Hello Shuwen,
What functionality of dir /var/lib/heartbeat/cores/hacluster?
if a component of heartbeat crashed, the core files are kept in this
directory to do post portem analysis of the problem.
How to fix this error print? What is your advice?
Fix the permissions. For me the permissions
Hello Andrew,
In this case, it is the initial monitor (the one that tells pacemaker
what state the service is in before we try to start anything) that is
failing. For the ones returning rc=1, it looks like something was
wrong but the cluster was able to clean them up (by running stop) and
Hello,
ipv6addr=2600:3c00::0034:c007
from the manpage of ocf_heartbeat_IPv6addr it looks like that you have
to specify the netmask so try:
ipv6addr=2600:3c00::0034:c007/64 assuiming that you're in a /64.
Cheers,
Thomas
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Hello Nick,
Thanks for the tip, however, it did not work. That's actually a /116.
So I put in 2600:3c00::0034:c007/116 and am getting the same
error. I requested that it restart the resource as well, just to make
sure it wasn't the previous error.
now, I had to try it:
node
Hello Nick,
Anything I need to do to allow IPv6... or something?
I agree with Greg here. Have you tried setting the address manually?
ip -6 addr add ip/cidr dev eth0
ip -6 addr show dev eth0
ip -6 addr del ip/cidr dev eth0
ip -6 addr show dev eth0
(node-62) [~] ip -6 addr add
Hello Nick,
I shouldn't be able to do that if the IPv6 module wasn't loaded,
correct?
that is correct. I tried modifying my netmask to copy yours. And I get
the same error, you do:
ipv6test_start_0 (node=node-62, call=6, rc=1, status=complete): unknown
error
So probably a bug in the
Hello,
I have an openais installation on centos which has logged failed
actions, but the services appear to be 'started'. As I know heartbeat/pacemaker
if an action fails the service should not be started. I also have
a system on Debian squeeze that stops the service when a monitor action
for IPMI
Hello Terry,
What would cause the stonith 'start' operation to fail after it
initially had succeeded?
if my understanding is correct (I wrote a stonith agent for vsphere
yesterday). Than it runs the status command of the stonith agent and
looks at the exist status, like that:
(ha-01) [~]
=0 timeout=30s interval=10s start-delay=10s
/
action name=meta-data timeout=5s /
action name=validate-all timeout=20s /
/actions
/resource-agent
END
;;
esac
#!/usr/bin/perl
use strict;
use warnings FATAL = 'all';
# Thomas Glanzmann 10:28 09-08-19
# apt-get install libarchive-zip-perl
Hello Andrew,
* Andrew Beekhof [EMAIL PROTECTED] [080117 09:13]:
On Jan 17, 2008, at 7:34 AM, Thomas Glanzmann wrote:
I use Linux HA to monitor some services on a dial in machine. A so
called single node lcuster. For example sometimes my dial-in connection
or openvpn connection, or IPv6
Hello Andrew,
is this possible today?
yes but only with pacemaker 0.7
thanks a lot I found the configuration option failure-timeout=60s
Can someone give me a short walk-through?
Look for Migrating Due to Failure in
http://clusterlabs.org/mw/Image:Configuration_Explained_1.0.pdf
Hello Dejan,
http://hg.clusterlabs.org/pacemaker/doc/archive/tip.tar.gz
I am unable to build this:
(ad027088pc) [/var/tmp/Pacemaker-Docs-80da5f68a837] make
/usr/lib/ocf/resource.d/heartbeat/AudibleAlarm: line 19:
/resource.d/heartbeat/.ocf-shellfuncs: No such file or directory
-:1: parser
Hello Coach-X (what a strange name),
This has happened several times. Nothing shows up in either log file,
and a hard reboot brings the master back online. Is this caused by
the serial link still being active? Is there a way to have this type
of issue cause the slave to become active?
Hello Danny,
Would be really nice to have that as cluster command in HA or as
hb_gui feature already available. Or just a switch to enable/disable
failover for mainteance purpose.
it is already there. It is the default policy. I just don't bother to
look it up in the manual, but maybe you are
Hello Chris,
there is no need to put the vlan logic into the resource agent. Just
configure the interface _before_ and use it _afterwards_. I have it
running for ages on two different machines and it just works.
Thomas
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Hello Martin,
it is pure luck that I am so bored that I read this list, next time CC
me. :-)
I have read several postings in the mail archive about the
external/ipmi configuration but there are still some questions that
bother me. The last posting from Thomas: did this cib-configuration
Hello Ken,
I am having trouble compiling Heartbeat 2.0.7 on a Solaris 10 system.
I have tried SunStudio11 and gcc 3.3 and 4.0. Is there any information
I can read that might help? It's complaining about Gmain_timeout_funcs
in lib/clplumbing/GSource.c, if anyone has seen that before.
first of
Hello Franck,
Suppose I have a 3 nodes cluster: node1, node2, node3. I want to
remove node2 from the cluster to be able to perform various operation
on the node2 without any risk of ressources moving to node2. I tried
to figure out with the cibadmin or crm_ressource but I don't get it.
#
Hello Amy,
What about something like monit to make sure ssh is up and running and
restart if it crashes?
thanks for the pointer. A very interesting tool. I was looking for
something like that but decided to write something by myself but it
sounds great maybe I will give it a try.
Hello,
I would like to do a Cluster-IP Setup with SLES 10. A few things are
unclear for me. With ClusterIP you have one IP address that is shared on
two or more nodes. It useally uses a multicast mac address. Both nodes
see all traffic. But when one node goes down how does the other node see
that
Hello,
thank you a lot for the feedback! Now I understand how the failover
works. Has someone a ready to use cib.xml that I can use for testing. I
am going to try my luck right now and come back in an hour or so with my
findings. It would be nice if someone could comment on them.
Thomas
Hello,
I would like to write a script similiar to pingd that is spawnd and
populates a value in the cib that I can build a rule on. What do I have
to do to obtain the above. Concrete questions are:
- What do I have to put in the cib to spawn such an 'agent'?
- How do I propagate
Hello again,
here comes by cib.xml for a clusterip. But the ressource stickiness is not
working for me. When I shoutdown ha-2, the two clone instances stay on ha-1.
Any ideas? Before sending this e-mail I used the following command to
set some location constraints:
crm_resource -M -r ip0:0 -H
Hallo Lars
Uhm, what do you think should happen when you shutdown ha-2 - of
course they stat on ha-1 in that case?
I meant that I shut it down temporarily and if it comes back again the
clones stay both on one node instead of going back again.
I don't know what you're saying here ;-)
I
Hello Christopher,
Everything I have read about samba and HA made it seem like this was
not possible. Are others doing this too? Can you think of some good
tests to try to stress it (short of accessing a database or
something). I imagine a fail-over during a large copy operation would
fail,
Hello Fabiano,
Short question: Does anyone here have DRBD8 running with heartbeat
under Etch?
I do and it works like a charm. Search the archives for the complete
config or drop me an e-mail and I resend it to you with a few things you
should obey I to get a perfect drbd setup.
Thomas
Hello Stefano,
it is not possible to configure drbd in a master/slave through the gui.
For a walkthrough use one of the following:
http://article.gmane.org/gmane.linux.highavailability.user/22132
Thomas
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Hello Dominik,
You can also start pingd from ha.cf with a respawn directive. Just as Steve
did it. Works fine here and imho has the advantage of a pingd value being
calculated when the constraints are applied (because pingd starts right
away and not just when the crm comes alive).
I see.
Hello Steve,
attached is a working example for a postgres cluster. Put your
filesystem, ip, database thing in a ressource group and drop the
colocation and order constraints or you have to define your order rules
on two directions. See also this thread:
Hi Steve,
your cib.xml isn't working because you forget to propagate the pingd
values. You have forgot to add the pingd clone ressource to your
cib.xml. Common mistake I did it once by myself so your scores don't get
propagated:
put that in your ressources section in the cib:
clone
Hello Kettunen,
I have SLES10 SP1 HA 2.0.8 split site two node cluster and I've
configured pingd clone resource to make resource location constrains. It
works very well. My ping node is Iscsi server in third site from where
cluster node mounts its resource disk. If I disconnect all
Hallo Kettunen,
Correction. I ment to say that splitbrain detection should be done
when nodes see each other again (even at network level). CRM status
messages do move when connection between nodes is back, but other node
don't accept messages from other node.
I aggree with you. They should
Hello Marc,
If I kill the node hosting postgresr2, postgresr2 migrates to another
node, but applisr1 and applisr3 aren't restarted. Is it normal ? What
could I do to solve this ?
the answer to your question is 'resource group'. A resource group is a
container for resources. Every resource in
Hello Dejan,
Nice effort. Thanks for sharing it. Perhaps you'd like to put
this into the wiki.linux-ha.org. If you do, don't forget to
pepper the doc with YMMV.
I am going to do that.
1. cib is a bit too lean. There are no attributes set for the ietd
resource.
Well I have that default
Trent,
I just did a very similar thing, except in my case I am using shared
storage (MD3000 - SAS) and theres a bit more fun to that part of it
(multipath, stonith, etc) - also I setup heartbeat in v1 mode not CRM
mode.
nice, I neve had a MD3000 on my hands.
I plan to post a
Hello Jeff,
Please find attached the Nagios OCF script I wrote.
thank you for sharing.
monitor_nagios(){
case ${NAGIOSRUNNING} in
yes)
if [ -f ${OCF_RESKEY_pid} ]; then
echo ${0} MONITOR: running
exit 0
fi
;;
no)
if [ -f
Hello Jeff,
I am attempting to write an OCF compliant script for nagios. I have
followed the documentation here:
I attached the one I am using. Keep me posted if you do something
different.
Thomas
#!/bin/bash
. ${OCF_ROOT}/resource.d/heartbeat/.ocf-shellfuncs
export
Hello,
You don't need location constraints.
okay. Could elaborate please?
Does the stonith subsystem automatically know where to put them?
Thomas
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Hello Lars,
If the node fails, and the other side needs STONITH, the resource will
be started in that partition automatically. The location constraints
don't hurt, but you don't need them. STONITH resources get started
before any STONITH operation is performed, which has roughly the same
Lars,
Assuming that the fencing device can be reached from all nodes, it
doesn't matter where they are put. Only if you have, say, a serial power
switch which is only reachable from one node do you need location
constraints.
I have a two node cluster. I use external/ipmi which needs one
Hello Dejan,
http://developerbugs.linux-foundation.org/show_bug.cgi?id=1752
According to this, it does matter. There really is a check in
stonithd which prevents a node to stonith itself.
So, I'd say that there should be a location constraint which says
not to run a stonith resource on the
Hello,
is it possible with linux-ha to supervice (monitor) a resource and start
it when it failed, but do not stop it when heartbeat is stopped?
I am thinking about the syslog daemon and sshd.
Thomas
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of tomcat init script shipped with debian. #
# Thomas Glanzmann --tg 21:22 07-12-30 #
# # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # #
# This script manages a Heartbeat Tomcat instance
# usage: $0 {start|stop|status|monitor|meta
/resource-agent
END
;;
esac
#!/bin/sh
# # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # #
# OCF Ressource Agent on top of tomcat init script shipped with debian. #
# Thomas Glanzmann --tg 21:22 07-12-30
Hello,
the previous extern/ipmi configuration worked, but I don't know why.
However here is one that seems to be follow standard practice:
resources
primitive id=postgres-01-fencing class=stonith
type=external/ipmi provider=heartbeat
operations
op
Hello,
I have a two-node test cluster. I added a ping statement to each of the
nodes to ping the default network. The two nodes are connected to the
same network segment and have a crosslink cable between them. When I
plug out the cable of the node that is running the service, I see the
following
Hello,
I use Linux HA to monitor some services on a dial in machine. A so
called single node lcuster. For example sometimes my dial-in connection
or openvpn connection, or IPv6 connectivity does not come. Is there a
way to tell Linux-HA to retry a failed resource after a certain amount
of time
Hello,
Jan 17 05:50:56 ha-2 heartbeat: [4452]: WARN: node 10.0.0.1: is dead
Jan 17 05:50:56 ha-2 heartbeat: [4452]: info: Link 10.0.0.1:10.0.0.1
dead.
Jan 17 05:50:56 ha-2 crmd: [4470]: notice: crmd_ha_status_callback:
Status update: Node 10.0.0.1 now has status
Hello Boroczki,
I'd rather use kill -HUP `pidof nagios` (or something similar) to reload the
configuration of nagios.
this is what I ended up doing.
Thomas
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Lars,
Yes. You have more than one primitive within the clone, which doesn't
work.
Why do you do that?
Because there is no documentation, the maintainer doesn't answer to e-mail and
this was the only example that I found in the archives. And it seemed to work.
But I guess I was just lucky.
Hello,
I have 9 machines configured as 6 clusters:
~
and I can't count. But I have a ninth server who does smtp. But it will
soon go away and get a ha resource.
Thomas
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Hello Andrew,
looks sane enough - though linux-ha is slightly heavy for just
monitoring processes in a cluster-of-one.
any reason not to make it a four node cluster?
I have 9 machines configured as 6 clusters:
- 2x apache (ha resources: router; openvpn; nagios; apache +
Hello Andrew,
does that help?
yes it does. I have a test cluster. I will write a pseudo plugin or use
the ssh one to simulate the behaviour and come back to you if I have
something to work with. I am still not sure how it works, but maybe I
simply should start to read source code.
Hello,
could someone tell me what is wrong with that fencing configuration:
Jan 13 11:38:48 apache-02 pengine: [13769]: ERROR: clone_unpack: fencing has
too many children. Only the first (apache-01-fencing) will be cloned.
Jan 13 11:38:48 apache-02 pengine: [13769]: info: process_pe_message:
Hello Kirby,
WARNING: Don't stat/monitor me! MailTo is a pseudo resource agent, so
the status reported may be incorrect
I guess if I had to guess, I'd probably delete the 'MailTo_6_mon'
line... But I don't know if that'll affect the mail I get when
heartbeat switches things around
If
Hello,
honestly, i would not use this repository for my upgrades as - at
least in the past - major changes have been introduced during the
heartbeat 2.1.3 development. for example the constraints were heavily
modified.
I wouldn't use it for production either. But my point still stands this
Hello Alon,
I would update to 2.1.3 (I am not sure if that is your problem). And
make the interval for the monitor operation higher. At the moment it
seems to be scheduled each second.
Thomas
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Hello Michael,
http://www.ultramonkey.org/download/heartbeat/2.1.3/
which Debian Release do you use?
Thomas
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See also:
Hello Michael,
etch.
debian_version is 4.0
apt-get update and upgrade done.
the packages you try to use are for Debian Sid.
You can do of the following things:
- put deb http://131.188.30.102/~sithglan/linux-ha-die2te/ ./
into /etc/apt/sources.list and call apt-get update;
Hello,
Is this a regularly updated repository with the heartbeat ldirectord
packages (and only those packages)?
yes, it is. But in the future the path will be
deb http://131.188.30.102/~sithglan/ha/
Thomas
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Hello,
btw. the problem was that I build the packages on machine that had a
sarge gnutls-dev installed. I upgraded the package and just rolled it
out on 9 machines everything is up and running. :-)
Thomas
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Hello Andrew,
http://download.opensuse.org/repositories/server:/ha-clustering/
do you have a apt line to use that location? I tried to make something
up but failed.
Thomas
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Jason,
just to get sure that we're on the same page here:
- You have a two node cluster
- You have a resource that is running only on one node
- When you run the resource on node b, node a reports for that
resource a failed monitor?
If that is the case then
Hello Stephan,
No ideas about the problem?
I think the question was already answered by someone on the list.
Heartbeat doesn't support drbd-0.8 at the moment. Eg. you can run a
primary/secondary cluster but not a primary/primary cluster. So one who
understand what he is doing has to adopt the
Hello Jason,
1) It nominates a node as DC (in this case, node2, though I've seen both)
2) The 'failed actions' block get's these lines almost immediately:
resource_samba_storage_monitor_0 (node=node2.domain.com,
call=3, rc=9): Error
resource_samba_storage_monitor_0
Hello,
http://download.opensuse.org/repositories/server:/ha-clustering/Debian_Etch/Packages
the debian folks are good, but not quite that good..see:
http://ccrma.stanford.edu/planetccrma/man/man5/sources.list.5.html
for details on how to setup a custom apt source.
I read the manpage. I
Hello,
I want to setup a two nodes httpd cluster with heartbeat, and the
configuration listed below:
that shouldn't be a problem, just adopt the ha.cf on each node to
reflect the network card configuration.
And one more question, can I use bcast in VLAN environment?
You can. I have it
Hello,
1. Without restarting or shutting down the cluster, and without
editing the cib.xml file how can I make a change to the cluster
configuration (i.e. how can I use haresources2cib.py to generate an
updated cib.xml and get the cluster to use it without a restart)
I use 8 space wide
Hello Simon,
I double checked and 2.1.3-2 does include both
/usr/lib/stonith/plugins/external/ipmi and /usr/sbin/ciblint
I can confirm this. I used your diff, dsc and orig file to build a
package for Debian Etch (4.0). I am going to roll out the version
tonight on my production cluster (9
Hello Dejan,
Configuration is comparable to the external/ipmi. Just check the
parameter names and adjust the stonith type.
I see. So there is no need to touch ha.cf? Just add the ipmilan thing to
the cib.xml and that's it?
Thomas, if you could also do additional testing, that'd be great.
I
Hello Jason,
1) For the monitor action, I might suggest the docs be updated
slightly. According to http://www.linux-ha.org/OCFResourceAgent, 0
for 'running', 7 for 'stopped', and anything else is valid, but
indicates an error.
I have modified my script to only return '1' on error.
Hello Michael,
could you please send me your ocf resource agent for ietd and the Output
of cibadmin -Q without the status section. That is because I want to
do such a setup by myself. Have you tested and initiators with that
setup. I would like to use it with ESX Server Version 3.5. And would
like
Hello Andrew,
I believe it was considered too broken to continue shipping. None of
us have the required hardware to test/fix/maintain the relevant code.
I think you believe wrong. The external/ipmi plugin works out of the box
and perfectly fine at least for me. Just the documentation is
Hello Niels,
My personal experience with ietd is that it really doesn't like to be
stopped if it is in use. (i.e. kernel panics, kernel hangs etc.). I
would do some carefull testing before trying to use this in a
heartbeat environment.
I just want a proof of concept nor a production system.
Hello,
I would like to know how to setup a drbd + ocfs2 installation with two
masters? What ocf agent do I have to use for that? Has someone a working
example configuration? I would like to use heartbeat-2.1.3.
Thomas
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Hello Andrew,
Thanks - the PE is now smart enough to at least filter out the
duplicates :-)
thanks a lot for getting rid of this annoying bug. :-)
Thomas
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Hello Simon,
Thanks, I'll look into this. Though I was under the impression that
the ipmi module was broken. Has it been fixed?
there are two ipmi modules:
- ipmilan (a c implementation, that is not build by default)
- external/ipmi (a shell script)
The first one was indeed
Hello,
But it stops. If you have the machine with IPMI interface, could you
test my patch?
do you have a confugration for me. I have a machine with ipmi and the
external/ipmi stonith works for me. If you can walk me through
configuring ipmilan I can give it a spin.
Thomas
Hello Stephan,
could you please attach your config?
cibadmin -Q and drop the status section?
Thomas
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Hello Jayaprakash,
I Place the new script in
/usr/lib/ocf/resource.d/heartbeat/.ocf-shellfuncs and execute the
following commands.
hopefully you did not but from the output I can tell that you didn't.
You put it where it belongs.
If possible come to online, we discuss in detailed.. My id
Hello Dominik,
How can I test the stonith plugin eg. tell heartbeat to shoot someone?
iptables -I INPUT -j DROP
Okay. That is obvious. Play dead fish in the water. Lucky me that I
don't have a serial heartbeat. Thanks.
Thomas
___
Linux-HA
Hello Dejan,
I searched the archive but looked for ipmi in the subject, but now
that you mentioned it I searched for external stonith and I found an
example.
See http://linux-ha.org/ExternalStonithPlugins for an example. You
can also search the archive of this list for more examples.
I read
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