On 06/26/2012 03:49 PM, coma wrote: > Hello, > > i running on a 2 node cluster with corosync & drbd in active/passive > mode for mysql hight availablity. > > The cluster working fine (failover/failback & replication ok), i have no > network outage (network is monitored and i've not seen any failure) but > split-brain occurs very often and i don't anderstand why, maybe you can > help me?
Are the nodes virtual machines or have a high load from time to time? > > I'm new pacemaker/corosync/DRBD user, so my cluster and drbd > configuration are probably not optimal, so if you have any comments, > tips or examples I would be very grateful! > > Here is an exemple of corosync log when a split-brain occurs (1 hour log > to see before/after split-brain): > > http://pastebin.com/3DprkcTA Increase your token value in corosync.conf to a higher value ... like 10s, configure resource-level fencing in DRBD and setup STONITH for your cluster and use redundant corosync rings. Regards, Andreas -- Need help with Pacemaker? http://www.hastexo.com/now > > Thank you in advance for any help! > > > More details about my configuration: > > I have: > One prefered "master" node (node1) on a virtual server, and one "slave" > node on a physical server. > On each server, > eth0 is connected on my main LAN for client/server communication (with > cluster VIP) > Eth1 is connected on a dedicated Vlan for corosync communication > (network: 192.168.3.0 /30) > Eth2 is connected on a dedicated Vlan for drbd replication (network: > 192.168.2.0/30 <http://192.168.2.0/30>) > > Here is my drbd configuration: > > > resource drbd-mysql { > protocol C; > disk { > on-io-error detach; > } > handlers { > fence-peer "/usr/lib/drbd/crm-fence-peer.sh"; > after-resync-target "/usr/lib/drbd/crm-unfence-peer.sh"; > split-brain "/usr/lib/drbd/notify-split-brain.sh root"; > } > net { > cram-hmac-alg sha1; > shared-secret "secret"; > after-sb-0pri discard-younger-primary; > after-sb-1pri discard-secondary; > after-sb-2pri call-pri-lost-after-sb; > } > startup { > wfc-timeout 1; > degr-wfc-timeout 1; > } > on node1{ > device /dev/drbd1; > address 192.168.2.1:7801 <http://192.168.2.1:7801>; > disk /dev/sdb; > meta-disk internal; > } > on node2 { > device /dev/drbd1; > address 192.168.2.2:7801 <http://192.168.2.2:7801>; > disk /dev/sdb; > meta-disk internal; > } > } > > > Here my cluster config: > > node node1 \ > attributes standby="off" > node node2 \ > attributes standby="off" > primitive Cluster-VIP ocf:heartbeat:IPaddr2 \ > params ip="10.1.0.130" broadcast="10.1.7.255" nic="eth0" > cidr_netmask="21" iflabel="VIP1" \ > op monitor interval="10s" timeout="20s" \ > meta is-managed="true" > primitive cluster_status_page ocf:heartbeat:ClusterMon \ > params pidfile="/var/run/crm_mon.pid" > htmlfile="/var/www/html/cluster_status.html" \ > op monitor interval="4s" timeout="20s" > primitive datavg ocf:heartbeat:LVM \ > params volgrpname="datavg" exclusive="true" \ > op start interval="0" timeout="30" \ > op stop interval="0" timeout="30" > primitive drbd_mysql ocf:linbit:drbd \ > params drbd_resource="drbd-mysql" \ > op monitor interval="15s" > primitive fs_mysql ocf:heartbeat:Filesystem \ > params device="/dev/datavg/data" directory="/data" fstype="ext4" > primitive mail_alert ocf:heartbeat:MailTo \ > params email="myem...@test.com <mailto:myem...@test.com>" \ > op monitor interval="10" timeout="10" depth="0" > primitive mysqld ocf:heartbeat:mysql \ > params binary="/usr/bin/mysqld_safe" config="/etc/my.cnf" > datadir="/data/mysql/databases" user="mysql" > pid="/var/run/mysqld/mysqld.pid" socket="/var/lib/mysql/mysql.sock" > test_passwd="cluster_test" test_table="Cluster_Test.dbcheck" > test_user="cluster_test" \ > op start interval="0" timeout="120" \ > op stop interval="0" timeout="120" \ > op monitor interval="30s" timeout="30s" OCF_CHECK_LEVEL="1" > target-role="Started" > group mysql datavg fs_mysql Cluster-VIP mysqld cluster_status_page > mail_alert > ms ms_drbd_mysql drbd_mysql \ > meta master-max="1" master-node-max="1" clone-max="2" > clone-node-max="1" notify="true" > location mysql-preferred-node mysql inf: node1 > 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="1.1.6-3.el6-a02c0f19a00c1eb2527ad38f146ebc0834814558" \ > cluster-infrastructure="openais" \ > expected-quorum-votes="2" \ > stonith-enabled="false" \ > no-quorum-policy="ignore" \ > last-lrm-refresh="1340701656" > rsc_defaults $id="rsc-options" \ > resource-stickiness="100" \ > migration-threshold="2" \ > failure-timeout="30s" > > > _______________________________________________ > Pacemaker mailing list: Pacemaker@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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_______________________________________________ Pacemaker mailing list: Pacemaker@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
