On 16-7-2012 14:55, Dan Frincu wrote:
> Hi,
>
> On Mon, Jul 16, 2012 at 4:18 AM, Anne Blankert wrote:
>> Hello list,
>>
>> I am a newbie playing with heartbeat / pacemaker on ubuntu 12.04 LTS. I
>> have defined the following resource primitives and switchover/fail-over
>> works almost fine.
>>
>> primitive ip1 ocf:heartbeat:IPaddr2 \
>> params ip="10.10.10.2" nic="eth0:0"
>> primitive ip1arp ocf:heartbeat:SendArp \
>> params ip="10.10.10.2" nic="eth0:0"
>>
>> The firewall/router in the datacenter does not accept gratuitous ARP
>> (according to the manual: to prevent ip-spoofing). However, as a
>> work-around, I have a script that forces the router to reset the arp
>> table for the virtual ip. How can I tell the crm to run this script when
>> the IPaddr2 resource is moved?
>>
>> I found a parameter "local_start_script" that can be passed to
>> ocf:IPaddr2, but the IPaddr2 script ignores this parameter. In a post to
>> this list, a patch to IPaddr2 was proposed, but not accepted.
>>
>> primitive ip1 ocf:heartbeat:IPaddr2 \
>> params ip="10.10.10.2" nic="eth0:0" \
>> local_start_script="/home/user1/arpreset"
>>
>> There also exists the ocf:anything script, but this script expects a
>> parameter 'binfile' that should point to a deamon, not a one shot script.
>>
>> So, is there a simple - best practice - way to run a one-shot script on
>> switchover / fail-over / fail-back?
> Make the script LSB compliant [1], and then add it to the
> configuration or use the ocf:heartbeat:Dummy to create a RA out of
> that script. On the long run, the second option might prove more
> useful, but it depends on your specific requirements.
>
> HTH,
> Dan
>
> [1] http://www.linux-ha.org/wiki/LSB_Resource_Agents
The suggestion to take the ocf:heartbeat:Dummy script worked out fine.
Steps I took:
1. cd /usr/lib/ocf/resource.d/heartbeat
2. cp Dummy ArpReset
3. edit file ArpReset and replace all 'dummy' by 'arpreset' and 'Dummy'
by 'ArpReset'
4. insert the call(s) to the one-shot script(s) in file ArpReset
arpreset_start() {
arpreset_monitor
if [ $? = $OCF_SUCCESS ]; then
**** call script here
**** sleep 4
**** call script again
return $OCF_SUCCESS
fi
touch ${OCF_RESKEY_state}
}
5. test if the script is correct
ocf-tester -n resourcename ArpReset
6. crm configure edit
primitive arpreset ocf:heartbeat:ArpReset
group groupname resource1 resource2 arpreset
colocation colocoationname inf: resource1 resource2 arpreset
order ordername inf: resource1:start resource2:start arpreset:start
Thanks,
Anne
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