Second synchronized disk with drbd, corosync and pacemaker
A couple years a go, I configured a Fail Over system using DRBD, Corosync and Pacemaker with this tutorial. After years, I need more disk space on the system and also make it synchronize each other. So here I show the configuration example for that, if you want to adapt this configuration into your system, just make sure that you start the service in a correct order within crm console because if not, your Fail Over system will not work correctly.
DRBD configuration:
/etc/drbd.d/r0.res:
resource r0 {
protocol C;
flexible-meta-disk internal;
on fo2 {
address 10.0.0.2:7801;
device /dev/drbd0 minor 0;
disk /dev/sda7;
}
on fo3 {
address 10.0.0.3:7801;
device /dev/drbd0 minor 0;
disk /dev/sda7;
}
net {
after-sb-0pri discard-younger-primary;
after-sb-1pri discard-secondary;
after-sb-2pri call-pri-lost-after-sb;
}
}
/etc/drbd.d/r1.res:
resource r1 {
protocol C;
flexible-meta-disk internal;
on fo2 {
address 10.0.0.2:7802;
device /dev/drbd1;
disk /dev/sdc1;
}
on fo3 {
address 10.0.0.3:7802;
device /dev/drbd1;
disk /dev/sdc1;
}
net {
after-sb-0pri discard-younger-primary;
after-sb-1pri discard-secondary;
after-sb-2pri call-pri-lost-after-sb;
}
}
Pacemaker Configuration:
Below is the pacemaker crm configuration for the Fail Over system:
node fo2 \
attributes standby="off"
node fo3 \
attributes standby="off"
primitive ClusterIP ocf:heartbeat:IPaddr2 \
params ip="10.0.0.1" cidr_netmask="24" \
op monitor interval="30s"
primitive Links heartbeat:drbdlinks
primitive WebFS ocf:heartbeat:Filesystem \
params device="/dev/drbd0" directory="/sync" fstype="ext4" \
op start interval="0" timeout="60" \
op stop interval="0" timeout="60"
primitive WebFS2 ocf:heartbeat:Filesystem \
params device="/dev/drbd1" directory="/sync2" fstype="ext4" \
op start interval="0" timeout="60" \
op stop interval="0" timeout="60" \
meta target-role="Started"
primitive WebSite ocf:heartbeat:apache \
params configfile="/etc/apache2/apache2.conf" \
op monitor interval="1min" timeout="20s" \
op start interval="0" timeout="40s" \
op stop interval="0" timeout="60s"
primitive r0 ocf:linbit:drbd \
params drbd_resource="r0" \
op monitor interval="29s" role="Master" \
op monitor interval="31s" role="Slave" \
op start interval="0" timeout="240" \
op stop interval="0" timeout="100" \
op promote interval="0" timeout="90" \
op demote interval="0" timeout="90"
primitive r1 ocf:linbit:drbd \
params drbd_resource="r1" \
op monitor interval="29s" role="Master" \
op monitor interval="31s" role="Slave" \
op start interval="0" timeout="240" \
op stop interval="0" timeout="100" \
op promote interval="0" timeout="90" \
op demote interval="0" timeout="90"
group WebServer ClusterIP WebFS WebFS2 Links WebSite \
meta target-role="Started"
ms ms_r0 r0 \
meta master-max="1" master-node-max="1" clone-max="2" clone-node-max="1" notify="true"
ms ms_r1 r1 \
meta master-max="1" master-node-max="1" clone-max="2" clone-node-max="1" notify="true" target-role="Started"
location prefer-fo2 WebServer 50: fo2
colocation WebFS2-with-ms_r1 inf: WebFS2 ms_r1:Master
colocation WebServer-with-ms_ro inf: WebServer ms_r0:Master
colocation ms_r1-with-ms_r0 inf: ms_r1:Master ms_r0:Master
#order WebFS2-after-WebFS inf: WebFS:start WebFS2:start
order WebServer-after-ms_ro inf: ms_r0:promote WebServer:start
order ms_r0-after-ms_r1 inf: ms_r1:promote ms_r0:promote
property $id="cib-bootstrap-options" \
dc-version="1.1.7-ee0730e13d124c3d58f00016c3376a1de5323cff" \
cluster-infrastructure="openais" \
expected-quorum-votes="2" \
stonith-enabled="false" \
no-quorum-policy="ignore" \
last-lrm-refresh="1427300070"
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