[Openais] Failover constraint problem

[Andrew Beekhof]

On Sat, Apr 17, 2010 at 12:21 AM, Sandor Feher <sfeher at bluesystem.hu> wrote:
> Hi,
>
> First of all my goal is to set up a two-node cluster with pacemaker to
> serve our webhosting service.
> This config sites on two vmware virtual machines for testing purposes
> now. Both of them runs Debian Lenny.
>
> Here are the basic rules I set up:
>
> node0  has
>
> virtual ip
> drbd primary filesystem mounted under /mnt
> nfs server offers /mnt mount point to node1
>
> node1
>
> drbd secondary node
> nfs_client mounts node0's /mnt dir and it should be rw for both nodes
>
> If  node0 fails then node1 will act as primary drbd node, take over
> virtual ip and mount drbd partition under /mnt dir and will not start
> nfs_client resource because it makes no sense (nfs_client should be take
> down before drbd partition get mounted under /mnt).
> If node1 fails the nothing should be happen because nfs_client only run
> node which has secondary drbd partition
>
> So my problems are the following.
>
> 1.  If I migrate apache-group resorce to another node then nfs_client
> won't release the /mnt mount point (I know according to this config it
> should not).
>     I think I need some clever constraint to achieve this.

Perhaps instead of:
   colocation co_nfs_client inf: nfs_client ms-drbd0:Slave
try:
   colocation co_nfs_client -inf: nfs_client ms-drbd0:Master


> 2. If I shot down node1 (suppose that node0 the master at the moment and
> runs apache-group) then nothing happens as expected but if node1 comes
> online again the apache-group start to migrate to node1. I don't
> understand why

because you told it to:
   location cli-prefer-apache-group apache-group \
         rule $id="cli-prefer-rule-apache-group" inf: #uname eq node0

Change inf to (for example) 1000

> because there is a constraint for this to get
> apache-group run on node which primary drbd resource and in this
> situation node0 is.
>
>
> crm configure show
>
> node node0 \
>        attributes standby="off"
> node node1 \
>        attributes standby="off"
> primitive drbd0 ocf:heartbeat:drbd \
>        params drbd_resource="r0" \
>        op monitor interval="59s" role="Master" timeout="30s" \
>        op monitor interval="60s" role="Slave" timeout="30s"
> primitive fs0 ocf:heartbeat:Filesystem \
>        params fstype="ext3" directory="/mnt" device="/dev/drbd0" \
>        meta target-role="Started"
> primitive nfs_client ocf:heartbeat:Filesystem \
>        params fstype="nfs" directory="/mnt/"
> device="192.168.1.40:/mnt/"
> options="hard,intr,noatime,rw,nolock,tcp,timeo=50" \
>        meta target-role="Stopped"
> primitive nfs_server lsb:nfs-kernel-server \
>        op monitor interval="1min"
> primitive virtual-ip ocf:heartbeat:IPaddr2 \
>        params ip="192.168.1.40" broadcast="192.168.1.255" nic="eth0"
> cidr_netmask="24" \
>        op monitor interval="21s" timeout="5s" target-role="Started"
> group apache-group fs0 virtual-ip nfs_server \
>        meta target-role="Started"
> ms ms-drbd0 drbd0 \
>        meta clone-max="2" notify="true" globally-unique="false"
> target-role="Started"
> location cli-prefer-apache-group apache-group \
>        rule $id="cli-prefer-rule-apache-group" inf: #uname eq node0
> colocation apache-group-on-ms-drbd0 inf: apache-group ms-drbd0:Master
> colocation co_nfs_client inf: nfs_client ms-drbd0:Slave
> order ms-drbd0-before-apache-group inf: ms-drbd0:promote apache-group:start
> order ms-drbd0-before-nfs_client inf: ms-drbd0:promote nfs_client:start
> property $id="cib-bootstrap-options" \
>        dc-version="1.0.8-2c98138c2f070fcb6ddeab1084154cffbf44ba75" \
>        cluster-infrastructure="openais" \
>        stonith-enabled="false" \
>        no-quorum-policy="ignore" \
>        expected-quorum-votes="2" \
>        last-lrm-refresh="1271453094"
>
> node1:~# crm_mon -1
> ============
> Last updated: Fri Apr 16 23:49:30 2010
> Stack: openais
> Current DC: node0 - partition with quorum
> Version: 1.0.8-2c98138c2f070fcb6ddeab1084154cffbf44ba75
> 2 Nodes configured, 2 expected votes
> 3 Resources configured.
> ============
>
> Online: [ node0 node1 ]
>
>  Resource Group: apache-group
>     fs0        (ocf::heartbeat:Filesystem):    Started node1
> (unmanaged) FAILED
>     virtual-ip (ocf::heartbeat:IPaddr2):       Stopped
>     nfs_server (lsb:nfs-kernel-server):        Stopped
>  Master/Slave Set: ms-drbd0
>     Masters: [ node0 ]
>     Slaves: [ node1 ]
>  nfs_client     (ocf::heartbeat:Filesystem):    Started node1
> (unmanaged) FAILED
>
> Failed actions:
>    nfs_client_start_0 (node=node0, call=98, rc=1, status=complete):
> unknown error
>    fs0_stop_0 (node=node1, call=9, rc=-2, status=Timed Out): unknown
> exec error
>    nfs_client_stop_0 (node=node1, call=7, rc=-2, status=Timed Out):
> unknown exec error
>
>
> I really appreciate any idea. Thank you in advance.
>
> Regards,   Sandor
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