I have a pacemaker cluster with following config:
crm(live)configure# show
node node1
node node2
primitive ClusterIP ocf:heartbeat:IPaddr2 \
params ip="192.168.56.111" cidr_netmask="32" nic="eth1"
iflabel="1" \
op monitor interval="30s"
primitive apache2 lsb:apache2 \
meta priority="1000" failure-timeout="60s"
migration-threshold="3" \
op start interval="0" timeout="20s" \
op stop interval="0" timeout="20s" \
op monitor interval="1s" timeout="20s" start-delay="10"
primitive drbd ocf:linbit:drbd \
params drbd_resource="r0" \
op monitor interval="29s" role="Master" \
op monitor interval="31s" role="Slave"
primitive fs_drbd ocf:heartbeat:Filesystem \
params device="/dev/drbd0" directory="/mnt/drbd0"
fstype="ext3" \
meta failure-timeout="60s"
primitive sym_apache2 ocf:heartbeat:symlink \
params target="/mnt/drbd0/var/www" link="/var/www"
backup_suffix=".crm"
group services sym_apache2 apache2 \
meta migration-threshold="1"
ms ms_drbd drbd \
meta master-max="1" master-node-max="1" clone-max="2"
clone-node-max="1" notify="true"
colocation fs_colocation inf: ms_drbd:Master fs_drbd
colocation ip_loc inf: fs_drbd ClusterIP
colocation service_loc inf: ClusterIP services
order fs_order inf: ms_drbd:promote fs_drbd:start
order ip_ord inf: fs_drbd:start ClusterIP:start
order service_ord inf: ClusterIP:start services:start
property $id="cib-bootstrap-options" \
dc-version="1.1.10-42f2063" \
cluster-infrastructure="classic openais (with plugin)" \
no-quorum-policy="ignore" \
stonith-enabled="false" \
stonith-action="poweroff" \
expected-quorum-votes="2" \
last-lrm-refresh="1403783847"
This cluster works as expected. If apache fails, everything is migrated
to another node. But i would expect the colocation statements to be
different. As far as i understand "colocation loc inf: X Y" puts Y
somewhere then puts X in the same place. And "order ord inf: X Y" starts
X and then Y. So when i have both i would expect them to look like this:
colocation loc inf: Y X
order ord inf: X Y
So start X and then Y, and put X somewhere and then Y on the same node.
But in my config it's clearly the oposite of that:
colocation fs_colocation inf: ms_drbd:Master fs_drbd
order fs_order inf: ms_drbd:promote fs_drbd:start
So promote drbd then start fs, and promote master where fs is (which
makes no sense to me).
I can reverse the colocation and do:
colocation fs_colocation inf: fs_drbd ms_drbd:Master
colocation ip_loc inf: ClusterIP fs_drbd
colocation service_loc inf: services ClusterIP
But then when apache fails on one node it's just stopped and nothing
else happens.
What part of ordering and colocation do i have wrong?
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