[Pacemaker] Nodes will not promote DRBD resources to master on failover
Andreas Kurz
andreas at hastexo.com
Wed Mar 28 14:03:06 UTC 2012
On 03/28/2012 03:47 PM, Andrew Martin wrote:
> Hi Andreas,
>
>> hmm ... what is that fence-peer script doing? If you want to use
>> resource-level fencing with the help of dopd, activate the
>> drbd-peer-outdater script in the line above ... and double check if the
>> path is correct
> fence-peer is just a wrapper for drbd-peer-outdater that does some
> additional logging. In my testing dopd has been working well.
I see
>
>>> I am thinking of making the following changes to the CIB (as per the
>>> official DRBD
>>> guide
> http://www.drbd.org/users-guide/s-pacemaker-crm-drbd-backed-service.html) in
>>> order to add the DRBD lsb service and require that it start before the
>>> ocf:linbit:drbd resources. Does this look correct?
>>
>> Where did you read that? No, deactivate the startup of DRBD on system
>> boot and let Pacemaker manage it completely.
>>
>>> primitive p_drbd-init lsb:drbd op monitor interval="30"
>>> colocation c_drbd_together inf:
>>> p_drbd-init ms_drbd_vmstore:Master ms_drbd_mount1:Master
>>> ms_drbd_mount2:Master
>>> order drbd_init_first inf: ms_drbd_vmstore:promote
>>> ms_drbd_mount1:promote ms_drbd_mount2:promote p_drbd-init:start
>>>
>>> This doesn't seem to require that drbd be also running on the node where
>>> the ocf:linbit:drbd resources are slave (which it would need to do to be
>>> a DRBD SyncTarget) - how can I ensure that drbd is running everywhere?
>>> (clone cl_drbd p_drbd-init ?)
>>
>> This is really not needed.
> I was following the official DRBD Users Guide:
> http://www.drbd.org/users-guide/s-pacemaker-crm-drbd-backed-service.html
>
> If I am understanding your previous message correctly, I do not need to
> add a lsb primitive for the drbd daemon? It will be
> started/stopped/managed automatically by my ocf:linbit:drbd resources
> (and I can remove the /etc/rc* symlinks)?
Yes, you don't need that LSB script when using Pacemaker and should not
let init start it.
Regards,
Andreas
--
Need help with Pacemaker?
http://www.hastexo.com/now
>
> Thanks,
>
> Andrew
>
> ------------------------------------------------------------------------
> *From: *"Andreas Kurz" <andreas at hastexo.com <mailto:andreas at hastexo.com>>
> *To: *pacemaker at oss.clusterlabs.org <mailto:pacemaker at oss.clusterlabs.org>
> *Sent: *Wednesday, March 28, 2012 7:27:34 AM
> *Subject: *Re: [Pacemaker] Nodes will not promote DRBD resources to
> master on failover
>
> On 03/28/2012 12:13 AM, Andrew Martin wrote:
>> Hi Andreas,
>>
>> Thanks, I've updated the colocation rule to be in the correct order. I
>> also enabled the STONITH resource (this was temporarily disabled before
>> for some additional testing). DRBD has its own network connection over
>> the br1 interface (192.168.5.0/24 network), a direct crossover cable
>> between node1 and node2:
>> global { usage-count no; }
>> common {
>> syncer { rate 110M; }
>> }
>> resource vmstore {
>> protocol C;
>> startup {
>> wfc-timeout 15;
>> degr-wfc-timeout 60;
>> }
>> handlers {
>> #fence-peer "/usr/lib/heartbeat/drbd-peer-outdater -t 5";
>> fence-peer "/usr/local/bin/fence-peer";
>
> hmm ... what is that fence-peer script doing? If you want to use
> resource-level fencing with the help of dopd, activate the
> drbd-peer-outdater script in the line above ... and double check if the
> path is correct
>
>> split-brain "/usr/lib/drbd/notify-split-brain.sh
>> me at example.com <mailto:me at example.com>";
>> }
>> net {
>> after-sb-0pri discard-zero-changes;
>> after-sb-1pri discard-secondary;
>> after-sb-2pri disconnect;
>> cram-hmac-alg md5;
>> shared-secret "xxxxx";
>> }
>> disk {
>> fencing resource-only;
>> }
>> on node1 {
>> device /dev/drbd0;
>> disk /dev/sdb1;
>> address 192.168.5.10:7787;
>> meta-disk internal;
>> }
>> on node2 {
>> device /dev/drbd0;
>> disk /dev/sdf1;
>> address 192.168.5.11:7787;
>> meta-disk internal;
>> }
>> }
>> # and similar for mount1 and mount2
>>
>> Also, here is my ha.cf. It uses both the direct link between the nodes
>> (br1) and the shared LAN network on br0 for communicating:
>> autojoin none
>> mcast br0 239.0.0.43 694 1 0
>> bcast br1
>> warntime 5
>> deadtime 15
>> initdead 60
>> keepalive 2
>> node node1
>> node node2
>> node quorumnode
>> crm respawn
>> respawn hacluster /usr/lib/heartbeat/dopd
>> apiauth dopd gid=haclient uid=hacluster
>>
>> I am thinking of making the following changes to the CIB (as per the
>> official DRBD
>> guide
> http://www.drbd.org/users-guide/s-pacemaker-crm-drbd-backed-service.html) in
>> order to add the DRBD lsb service and require that it start before the
>> ocf:linbit:drbd resources. Does this look correct?
>
> Where did you read that? No, deactivate the startup of DRBD on system
> boot and let Pacemaker manage it completely.
>
>> primitive p_drbd-init lsb:drbd op monitor interval="30"
>> colocation c_drbd_together inf:
>> p_drbd-init ms_drbd_vmstore:Master ms_drbd_mount1:Master
>> ms_drbd_mount2:Master
>> order drbd_init_first inf: ms_drbd_vmstore:promote
>> ms_drbd_mount1:promote ms_drbd_mount2:promote p_drbd-init:start
>>
>> This doesn't seem to require that drbd be also running on the node where
>> the ocf:linbit:drbd resources are slave (which it would need to do to be
>> a DRBD SyncTarget) - how can I ensure that drbd is running everywhere?
>> (clone cl_drbd p_drbd-init ?)
>
> This is really not needed.
>
> Regards,
> Andreas
>
> --
> Need help with Pacemaker?
> http://www.hastexo.com/now
>
>>
>> Thanks,
>>
>> Andrew
>> ------------------------------------------------------------------------
>> *From: *"Andreas Kurz" <andreas at hastexo.com <mailto:andreas at hastexo.com>>
>> *To: *pacemaker at oss.clusterlabs.org <mailto:*pacemaker at oss.clusterlabs.org>
>> *Sent: *Monday, March 26, 2012 5:56:22 PM
>> *Subject: *Re: [Pacemaker] Nodes will not promote DRBD resources to
>> master on failover
>>
>> On 03/24/2012 08:15 PM, Andrew Martin wrote:
>>> Hi Andreas,
>>>
>>> My complete cluster configuration is as follows:
>>> ============
>>> Last updated: Sat Mar 24 13:51:55 2012
>>> Last change: Sat Mar 24 13:41:55 2012
>>> Stack: Heartbeat
>>> Current DC: node2 (9100538b-7a1f-41fd-9c1a-c6b4b1c32b18) - partition
>>> with quorum
>>> Version: 1.1.6-9971ebba4494012a93c03b40a2c58ec0eb60f50c
>>> 3 Nodes configured, unknown expected votes
>>> 19 Resources configured.
>>> ============
>>>
>>> Node quorumnode (c4bf25d7-a6b7-4863-984d-aafd937c0da4): OFFLINE (standby)
>>> Online: [ node2 node1 ]
>>>
>>> Master/Slave Set: ms_drbd_vmstore [p_drbd_vmstore]
>>> Masters: [ node2 ]
>>> Slaves: [ node1 ]
>>> Master/Slave Set: ms_drbd_mount1 [p_drbd_mount1]
>>> Masters: [ node2 ]
>>> Slaves: [ node1 ]
>>> Master/Slave Set: ms_drbd_mount2 [p_drbd_mount2]
>>> Masters: [ node2 ]
>>> Slaves: [ node1 ]
>>> Resource Group: g_vm
>>> p_fs_vmstore(ocf::heartbeat:Filesystem):Started node2
>>> p_vm(ocf::heartbeat:VirtualDomain):Started node2
>>> Clone Set: cl_daemons [g_daemons]
>>> Started: [ node2 node1 ]
>>> Stopped: [ g_daemons:2 ]
>>> Clone Set: cl_sysadmin_notify [p_sysadmin_notify]
>>> Started: [ node2 node1 ]
>>> Stopped: [ p_sysadmin_notify:2 ]
>>> stonith-node1(stonith:external/tripplitepdu):Started node2
>>> stonith-node2(stonith:external/tripplitepdu):Started node1
>>> Clone Set: cl_ping [p_ping]
>>> Started: [ node2 node1 ]
>>> Stopped: [ p_ping:2 ]
>>>
>>> node $id="6553a515-273e-42fe-ab9e-00f74bd582c3" node1 \
>>> attributes standby="off"
>>> node $id="9100538b-7a1f-41fd-9c1a-c6b4b1c32b18" node2 \
>>> attributes standby="off"
>>> node $id="c4bf25d7-a6b7-4863-984d-aafd937c0da4" quorumnode \
>>> attributes standby="on"
>>> primitive p_drbd_mount2 ocf:linbit:drbd \
>>> params drbd_resource="mount2" \
>>> op monitor interval="15" role="Master" \
>>> op monitor interval="30" role="Slave"
>>> primitive p_drbd_mount1 ocf:linbit:drbd \
>>> params drbd_resource="mount1" \
>>> op monitor interval="15" role="Master" \
>>> op monitor interval="30" role="Slave"
>>> primitive p_drbd_vmstore ocf:linbit:drbd \
>>> params drbd_resource="vmstore" \
>>> op monitor interval="15" role="Master" \
>>> op monitor interval="30" role="Slave"
>>> primitive p_fs_vmstore ocf:heartbeat:Filesystem \
>>> params device="/dev/drbd0" directory="/vmstore" fstype="ext4" \
>>> op start interval="0" timeout="60s" \
>>> op stop interval="0" timeout="60s" \
>>> op monitor interval="20s" timeout="40s"
>>> primitive p_libvirt-bin upstart:libvirt-bin \
>>> op monitor interval="30"
>>> primitive p_ping ocf:pacemaker:ping \
>>> params name="p_ping" host_list="192.168.1.10 192.168.1.11"
>>> multiplier="1000" \
>>> op monitor interval="20s"
>>> primitive p_sysadmin_notify ocf:heartbeat:MailTo \
>>> params email="me at example.com <mailto:me at example.com>" \
>>> params subject="Pacemaker Change" \
>>> op start interval="0" timeout="10" \
>>> op stop interval="0" timeout="10" \
>>> op monitor interval="10" timeout="10"
>>> primitive p_vm ocf:heartbeat:VirtualDomain \
>>> params config="/vmstore/config/vm.xml" \
>>> meta allow-migrate="false" \
>>> op start interval="0" timeout="120s" \
>>> op stop interval="0" timeout="120s" \
>>> op monitor interval="10" timeout="30"
>>> primitive stonith-node1 stonith:external/tripplitepdu \
>>> params pdu_ipaddr="192.168.1.12" pdu_port="1" pdu_username="xxx"
>>> pdu_password="xxx" hostname_to_stonith="node1"
>>> primitive stonith-node2 stonith:external/tripplitepdu \
>>> params pdu_ipaddr="192.168.1.12" pdu_port="2" pdu_username="xxx"
>>> pdu_password="xxx" hostname_to_stonith="node2"
>>> group g_daemons p_libvirt-bin
>>> group g_vm p_fs_vmstore p_vm
>>> ms ms_drbd_mount2 p_drbd_mount2 \
>>> meta master-max="1" master-node-max="1" clone-max="2"
>>> clone-node-max="1" notify="true"
>>> ms ms_drbd_mount1 p_drbd_mount1 \
>>> meta master-max="1" master-node-max="1" clone-max="2"
>>> clone-node-max="1" notify="true"
>>> ms ms_drbd_vmstore p_drbd_vmstore \
>>> meta master-max="1" master-node-max="1" clone-max="2"
>>> clone-node-max="1" notify="true"
>>> clone cl_daemons g_daemons
>>> clone cl_ping p_ping \
>>> meta interleave="true"
>>> clone cl_sysadmin_notify p_sysadmin_notify
>>> location l-st-node1 stonith-node1 -inf: node1
>>> location l-st-node2 stonith-node2 -inf: node2
>>> location l_run_on_most_connected p_vm \
>>> rule $id="l_run_on_most_connected-rule" p_ping: defined p_ping
>>> colocation c_drbd_libvirt_vm inf: ms_drbd_vmstore:Master
>>> ms_drbd_mount1:Master ms_drbd_mount2:Master g_vm
>>
>> As Emmanuel already said, g_vm has to be in the first place in this
>> collocation constraint .... g_vm must be colocated with the drbd masters.
>>
>>> order o_drbd-fs-vm inf: ms_drbd_vmstore:promote ms_drbd_mount1:promote
>>> ms_drbd_mount2:promote cl_daemons:start g_vm:start
>>> property $id="cib-bootstrap-options" \
>>> dc-version="1.1.6-9971ebba4494012a93c03b40a2c58ec0eb60f50c" \
>>> cluster-infrastructure="Heartbeat" \
>>> stonith-enabled="false" \
>>> no-quorum-policy="stop" \
>>> last-lrm-refresh="1332539900" \
>>> cluster-recheck-interval="5m" \
>>> crmd-integration-timeout="3m" \
>>> shutdown-escalation="5m"
>>>
>>> The STONITH plugin is a custom plugin I wrote for the Tripp-Lite
>>> PDUMH20ATNET that I'm using as the STONITH device:
>>> http://www.tripplite.com/shared/product-pages/en/PDUMH20ATNET.pdf
>>
>> And why don't using it? .... stonith-enabled="false"
>>
>>>
>>> As you can see, I left the DRBD service to be started by the operating
>>> system (as an lsb script at boot time) however Pacemaker controls
>>> actually bringing up/taking down the individual DRBD devices.
>>
>> Don't start drbd on system boot, give Pacemaker the full control.
>>
>> The
>>> behavior I observe is as follows: I issue "crm resource migrate p_vm" on
>>> node1 and failover successfully to node2. During this time, node2 fences
>>> node1's DRBD devices (using dopd) and marks them as Outdated. Meanwhile
>>> node2's DRBD devices are UpToDate. I then shutdown both nodes and then
>>> bring them back up. They reconnect to the cluster (with quorum), and
>>> node1's DRBD devices are still Outdated as expected and node2's DRBD
>>> devices are still UpToDate, as expected. At this point, DRBD starts on
>>> both nodes, however node2 will not set DRBD as master:
>>> Node quorumnode (c4bf25d7-a6b7-4863-984d-aafd937c0da4): OFFLINE (standby)
>>> Online: [ node2 node1 ]
>>>
>>> Master/Slave Set: ms_drbd_vmstore [p_drbd_vmstore]
>>> Slaves: [ node1 node2 ]
>>> Master/Slave Set: ms_drbd_mount1 [p_drbd_mount1]
>>> Slaves: [ node1 node 2 ]
>>> Master/Slave Set: ms_drbd_mount2 [p_drbd_mount2]
>>> Slaves: [ node1 node2 ]
>>
>> There should really be no interruption of the drbd replication on vm
>> migration that activates the dopd ... drbd has its own direct network
>> connection?
>>
>> Please share your ha.cf file and your drbd configuration. Watch out for
>> drbd messages in your kernel log file, that should give you additional
>> information when/why the drbd connection was lost.
>>
>> Regards,
>> Andreas
>>
>> --
>> Need help with Pacemaker?
>> http://www.hastexo.com/now
>>
>>>
>>> I am having trouble sorting through the logging information because
>>> there is so much of it in /var/log/daemon.log, but I can't find an
>>> error message printed about why it will not promote node2. At this point
>>> the DRBD devices are as follows:
>>> node2: cstate = WFConnection dstate=UpToDate
>>> node1: cstate = StandAlone dstate=Outdated
>>>
>>> I don't see any reason why node2 can't become DRBD master, or am I
>>> missing something? If I do "drbdadm connect all" on node1, then the
>>> cstate on both nodes changes to "Connected" and node2 immediately
>>> promotes the DRBD resources to master. Any ideas on why I'm observing
>>> this incorrect behavior?
>>>
>>> Any tips on how I can better filter through the pacemaker/heartbeat logs
>>> or how to get additional useful debug information?
>>>
>>> Thanks,
>>>
>>> Andrew
>>>
>>> ------------------------------------------------------------------------
>>> *From: *"Andreas Kurz" <andreas at hastexo.com <mailto:andreas at hastexo.com>>
>>> *To: *pacemaker at oss.clusterlabs.org
> <mailto:*pacemaker at oss.clusterlabs.org>
>>> *Sent: *Wednesday, 1 February, 2012 4:19:25 PM
>>> *Subject: *Re: [Pacemaker] Nodes will not promote DRBD resources to
>>> master on failover
>>>
>>> On 01/25/2012 08:58 PM, Andrew Martin wrote:
>>>> Hello,
>>>>
>>>> Recently I finished configuring a two-node cluster with pacemaker 1.1.6
>>>> and heartbeat 3.0.5 on nodes running Ubuntu 10.04. This cluster includes
>>>> the following resources:
>>>> - primitives for DRBD storage devices
>>>> - primitives for mounting the filesystem on the DRBD storage
>>>> - primitives for some mount binds
>>>> - primitive for starting apache
>>>> - primitives for starting samba and nfs servers (following instructions
>>>> here <http://www.linbit.com/fileadmin/tech-guides/ha-nfs.pdf>)
>>>> - primitives for exporting nfs shares (ocf:heartbeat:exportfs)
>>>
>>> not enough information ... please share at least your complete cluster
>>> configuration
>>>
>>> Regards,
>>> Andreas
>>>
>>> --
>>> Need help with Pacemaker?
>>> http://www.hastexo.com/now
>>>
>>>>
>>>> Perhaps this is best described through the output of crm_mon:
>>>> Online: [ node1 node2 ]
>>>>
>>>> Master/Slave Set: ms_drbd_mount1 [p_drbd_mount1] (unmanaged)
>>>> p_drbd_mount1:0 (ocf::linbit:drbd): Started node2
>> (unmanaged)
>>>> p_drbd_mount1:1 (ocf::linbit:drbd): Started node1
>>>> (unmanaged) FAILED
>>>> Master/Slave Set: ms_drbd_mount2 [p_drbd_mount2]
>>>> p_drbd_mount2:0 (ocf::linbit:drbd): Master node1
>>>> (unmanaged) FAILED
>>>> Slaves: [ node2 ]
>>>> Resource Group: g_core
>>>> p_fs_mount1 (ocf::heartbeat:Filesystem): Started node1
>>>> p_fs_mount2 (ocf::heartbeat:Filesystem): Started node1
>>>> p_ip_nfs (ocf::heartbeat:IPaddr2): Started node1
>>>> Resource Group: g_apache
>>>> p_fs_mountbind1 (ocf::heartbeat:Filesystem): Started node1
>>>> p_fs_mountbind2 (ocf::heartbeat:Filesystem): Started node1
>>>> p_fs_mountbind3 (ocf::heartbeat:Filesystem): Started node1
>>>> p_fs_varwww (ocf::heartbeat:Filesystem): Started node1
>>>> p_apache (ocf::heartbeat:apache): Started node1
>>>> Resource Group: g_fileservers
>>>> p_lsb_smb (lsb:smbd): Started node1
>>>> p_lsb_nmb (lsb:nmbd): Started node1
>>>> p_lsb_nfsserver (lsb:nfs-kernel-server): Started node1
>>>> p_exportfs_mount1 (ocf::heartbeat:exportfs): Started node1
>>>> p_exportfs_mount2 (ocf::heartbeat:exportfs): Started node1
>>>>
>>>> I have read through the Pacemaker Explained
>>>>
>>>
>> <http://www.clusterlabs.org/doc/en-US/Pacemaker/1.1/html-single/Pacemaker_Explained>
>>>> documentation, however could not find a way to further debug these
>>>> problems. First, I put node1 into standby mode to attempt failover to
>>>> the other node (node2). Node2 appeared to start the transition to
>>>> master, however it failed to promote the DRBD resources to master (the
>>>> first step). I have attached a copy of this session in commands.log and
>>>> additional excerpts from /var/log/syslog during important steps. I have
>>>> attempted everything I can think of to try and start the DRBD resource
>>>> (e.g. start/stop/promote/manage/cleanup under crm resource, restarting
>>>> heartbeat) but cannot bring it out of the slave state. However, if I set
>>>> it to unmanaged and then run drbdadm primary all in the terminal,
>>>> pacemaker is satisfied and continues starting the rest of the resources.
>>>> It then failed when attempting to mount the filesystem for mount2, the
>>>> p_fs_mount2 resource. I attempted to mount the filesystem myself and was
>>>> successful. I then unmounted it and ran cleanup on p_fs_mount2 and then
>>>> it mounted. The rest of the resources started as expected until the
>>>> p_exportfs_mount2 resource, which failed as follows:
>>>> p_exportfs_mount2 (ocf::heartbeat:exportfs): started node2
>>>> (unmanaged) FAILED
>>>>
>>>> I ran cleanup on this and it started, however when running this test
>>>> earlier today no command could successfully start this exportfs
> resource.
>>>>
>>>> How can I configure pacemaker to better resolve these problems and be
>>>> able to bring the node up successfully on its own? What can I check to
>>>> determine why these failures are occuring? /var/log/syslog did not seem
>>>> to contain very much useful information regarding why the failures
>>> occurred.
>>>>
>>>> Thanks,
>>>>
>>>> Andrew
>>>>
>>>>
>>>>
>>>>
>>>> This body part will be downloaded on demand.
>>>
>>>
>>>
>>>
>>>
>>> _______________________________________________
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> <mailto:Pacemaker at oss.clusterlabs.org>
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>>>
>>>
>>>
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> <mailto:Pacemaker at oss.clusterlabs.org>
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>>> Project Home: http://www.clusterlabs.org
>>> Getting started: http://www.clusterlabs.org/doc/Cluster_from_Scratch.pdf
>>> Bugs: http://bugs.clusterlabs.org
>>
>>
>>
>> _______________________________________________
>> Pacemaker mailing list: Pacemaker at oss.clusterlabs.org
> <mailto:Pacemaker at oss.clusterlabs.org>
>> http://oss.clusterlabs.org/mailman/listinfo/pacemaker
>>
>> Project Home: http://www.clusterlabs.org
>> Getting started: http://www.clusterlabs.org/doc/Cluster_from_Scratch.pdf
>> Bugs: http://bugs.clusterlabs.org
>>
>>
>>
>> _______________________________________________
>> Pacemaker mailing list: Pacemaker at oss.clusterlabs.org
> <mailto:Pacemaker at oss.clusterlabs.org>
>> http://oss.clusterlabs.org/mailman/listinfo/pacemaker
>>
>> Project Home: http://www.clusterlabs.org
>> Getting started: http://www.clusterlabs.org/doc/Cluster_from_Scratch.pdf
>> Bugs: http://bugs.clusterlabs.org
>
>
>
> _______________________________________________
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> <mailto:Pacemaker at oss.clusterlabs.org>
> http://oss.clusterlabs.org/mailman/listinfo/pacemaker
>
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> Bugs: http://bugs.clusterlabs.org
>
>
>
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> http://oss.clusterlabs.org/mailman/listinfo/pacemaker
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