Am 19.07.11 02:35, schrieb Andrew Beekhof:
> On Sat, Jul 16, 2011 at 7:31 PM, Willi Fehler<[email protected]>
> wrote:
>> Hi,
>>
>> I've installed a Pacemaker/OpenAIS/Corosync/DRBD/MySQL Cluster on
>> CentOS6. (VirtualBox)
>> If I start both nodes at the same time, I always get a split brain
> "Split brain" as in, corosync on the two nodes can't talk to one another?
>
>> situation, If I start
>> on node and wait if the node is promoted to DRBD-Master everything is
>> working. How can I tell Pacemaker which node always become master?
> a location constraint with role=Master
>
>> [root@linsrv001 ~]# crm configure show
>> node linsrv001.willi-net.local
>> node linsrv002.willi-net.local
>> primitive drbd_mysql ocf:linbit:drbd \
>> params drbd_resource="r0" \
>> op monitor interval="15s"
>> primitive fs_mysql ocf:heartbeat:Filesystem \
>> params device="/dev/drbd/by-res/r0" directory="/var/lib/mysql"
>> fstype="xfs"
>> primitive ip_mysql ocf:heartbeat:IPaddr2 \
>> params ip="192.168.2.92" nic="eth0"
>> primitive mysqld lsb:mysql
>> group mysql fs_mysql ip_mysql mysqld
>> ms ms_drbd_mysql drbd_mysql \
>> meta master-max="1" master-node-max="1" clone-max="2"
>> clone-node-max="1" notify="true"
>> location cli-prefer-mysql mysql \
>> rule $id="cli-prefer-rule-mysql" inf: #uname eq
>> linsrv001.willi-net.local
>> colocation mysql_on_drbd inf: mysql ms_drbd_mysql:Master
>> order mysql_after_drbd inf: ms_drbd_mysql:promote mysql:start
>> property $id="cib-bootstrap-options" \
>> dc-version="1.1.2-f059ec7ced7a86f18e5490b67ebf4a0b963bccfe" \
>> cluster-infrastructure="openais" \
>> expected-quorum-votes="2" \
>> no-quorum-policy="ignore" \
>> stonith-enabled="false"
>>
>> My second question is, what happens If one node fails and I have to
>> setup the hole node again. If I start OpenAIS/Corosync, what happens
>> with the CIB?(will the cluster information configuration will be
>> transfered to the node?)
>>
>> Regards - Willi
>>
>> _______________________________________________
>> Linux-HA mailing list
>> [email protected]
>> http://lists.linux-ha.org/mailman/listinfo/linux-ha
>> See also: http://linux-ha.org/ReportingProblems
>>
> _______________________________________________
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> http://lists.linux-ha.org/mailman/listinfo/linux-ha
> See also: http://linux-ha.org/ReportingProblems
Hi,
the split brain is triggered by DRBD.
/etc/drbd.conf
# You can find an example in /usr/share/doc/drbd.../drbd.conf.example
include "drbd.d/global_common.conf";
include "drbd.d/*.res";
resource r0 {
on linsrv001.willi-net.local {
address 10.10.10.1:7788;
device /dev/drbd0;
disk /dev/vg00/lv02;
meta-disk internal;
}
on linsrv002.willi-net.local {
address 10.10.10.2:7788;
device /dev/drbd0;
disk /dev/vg00/lv02;
meta-disk internal;
}
/etc/drbd.d/global_common.conf
global {
usage-count yes;
# minor-count dialog-refresh disable-ip-verification
}
common {
protocol C;
handlers {
#pri-on-incon-degr
"/usr/lib/drbd/notify-pri-on-incon-degr.sh;
/usr/lib/drbd/notify-emergency-reboot.sh; echo b > /proc/sysrq-trigger ;
reboot -f";
#pri-lost-after-sb
"/usr/lib/drbd/notify-pri-lost-after-sb.sh;
/usr/lib/drbd/notify-emergency-reboot.sh; echo b > /proc/sysrq-trigger ;
reboot -f";
#local-io-error "/usr/lib/drbd/notify-io-error.sh;
/usr/lib/drbd/notify-emergency-shutdown.sh; echo o > /proc/sysrq-trigger
; halt -f";
# fence-peer "/usr/lib/drbd/crm-fence-peer.sh";
# split-brain "/usr/lib/drbd/notify-split-brain.sh root";
# out-of-sync "/usr/lib/drbd/notify-out-of-sync.sh root";
# before-resync-target
"/usr/lib/drbd/snapshot-resync-target-lvm.sh -p 15 -- -c 16k";
# after-resync-target
/usr/lib/drbd/unsnapshot-resync-target-lvm.sh;
}
startup {
# wfc-timeout degr-wfc-timeout outdated-wfc-timeout
wait-after-sb
#wfc-timeout 0;
#degr-wfc-timeout 120;
}
disk {
# on-io-error fencing use-bmbv no-disk-barrier
no-disk-flushes
# no-disk-drain no-md-flushes max-bio-bvecs
}
net {
# sndbuf-size rcvbuf-size timeout connect-int ping-int
ping-timeout max-buffers
# max-epoch-size ko-count allow-two-primaries
cram-hmac-alg shared-secret
# after-sb-0pri after-sb-1pri after-sb-2pri
data-integrity-alg no-tcp-cork
}
syncer {
# rate after al-extents use-rle cpu-mask verify-alg
csums-alg
rate 110M;
}
}
}
[root@linsrv001 ~]# grep split /var/log/messages
Sep 12 06:16:21 linsrv001 kernel: block drbd0: helper command:
/sbin/drbdadm initial-split-brain minor-0
Sep 12 06:16:21 linsrv001 kernel: block drbd0: helper command:
/sbin/drbdadm initial-split-brain minor-0 exit code 0 (0x0)
Sep 12 06:16:21 linsrv001 kernel: block drbd0: helper command:
/sbin/drbdadm split-brain minor-0
Sep 12 06:16:21 linsrv001 kernel: block drbd0: helper command:
/sbin/drbdadm split-brain minor-0 exit code 0 (0x0)
Thank you for your support.
Regards - Willi
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