[Pacemaker] Mounting HA NFS resource(es) locally

[Timur I. Bakeyev]

Hi all!

I've configured HA NFS storage (almost) according to the LinBIT HOWTO and,
in general it works OK for my client nodes, which mount NFS share /web as
/var/www and use it as document root for NGINX.

To get maximum performance out of the configuration two NFS exports(/web
and /img) are configured asymmetrically, in an
Active/Passive+Passive/Active manner, so each of the two nodes is an active
server for one of the shares.

At this point I got stuck, as I want to use both of the NFS servers as
additional NGINX server nodes, so on each of them has to mount exported
/web and, when it is mounted - start NGINX.

So, taking for simplicity one Active/Passive pair - on both nodes I need to
mount /web, but on active node I first need to start DRBD and nfsserver and
on a passive node just need to wait until NFS share got available. After
that point both nodes can start NGINX.

And, honestly, I'm confused how to configure such a mount resource. It
seems it has to be master/slave resource, but I'm not so good with
Pacemaker to be able to express that in configuration terms :) So any help
would be appreciated!

Here is my config:

node ad24
node ad35
primitive export_share0 ocf:heartbeat:exportfs \
        params directory="/web" clientspec="10.0.0.0/24"
options="rw,async,no_subtree_check,no_root_squash" fsid="10"
rmtab_backup=".nfs/rmtab" unlock_on_stop="true" \
        op monitor interval="10s" timeout="30s" \
        op start interval="0" timeout="40s" \
        op stop interval="0" timeout="40s"
primitive fs_web ocf:heartbeat:Filesystem \
        params device="/dev/share0/web" directory="/web" fstype="xfs" \
        op monitor interval="20s" timeout="40s" \
        op start interval="0" timeout="60s" \
        op stop interval="0" timeout="60s" \
        meta is-managed="true"
primitive ip_share0 ocf:heartbeat:IPaddr2 \
        params ip="10.0.0.210" cidr_netmask="24" nic="bond0" \
        op monitor interval="5s" timeout="20s"
primitive lvm_share0 ocf:heartbeat:LVM \
        params volgrpname="share0" \
        op start interval="0" timeout="30s" \
        op stop interval="0" timeout="30s"
primitive share0 ocf:linbit:drbd \
        params drbd_resource="share0" \
        op monitor interval="29s" role="Master" timeout="40s" \
        op monitor interval="31s" role="Slave" timeout="40s" \
        op start interval="0" timeout="240s" \
        op stop interval="0" timeout="100s"
group res_share0 lvm_share0 fs_web export_share0 ip_share0
ms ms_share0 share0 \
        meta master-max="1" master-node-max="1" clone-max="2"
clone-node-max="1" notify="true"
location share0_on_ad24 ms_share0 \
        rule $id="share0_on_ad24-rule" inf: #uname eq ad24
colocation use_share0 inf: res_share0 ms_share0:Master
order activate_share0 inf: ms_share0:promote res_share0:start
property $id="cib-bootstrap-options" \
        dc-version="1.1.7-ee0730e13d124c3d58f00016c3376a1de5323cff" \
        cluster-infrastructure="openais" \
        expected-quorum-votes="2" \
        no-quorum-policy="ignore" \
        stonith-enabled="false" \
        last-lrm-refresh="1343967106"
rsc_defaults $id="rsc-options" \
        resource-stickiness="200"

With best regards,
Timur Bakeyev.
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