[ClusterLabs] Bloody Newbie needs help for OCFS2 on pacemaker+corosync+pcs

[Ken Gaillot]

On 08/02/2016 08:16 AM, thl at it-hluchnik.de wrote:
> Hello Kyle + all,
> 
> No luck at all. Cant get o2cb up at all. Please find details below.
> Thanks in advance for any help.
> 
> First I tried to translate your crm syntax to pcs syntax:
> 
> primitive p_o2cb lsb:o2cb \ op monitor interval="10" timeout="30"
> \ op start interval="0" timeout="120" \ op stop interval="0"
> timeout="120"
> 
> ||| vvv
> 
> # pcs resource create ResO2CB lsb:o2cb \ op monitor interval="10"
> timeout="30" \ op start interval="0" timeout="120" \ op stop
> interval="0" timeout="120"
> 
> Error: Unable to create resource 'lsb:o2cb', it is not installed on
> this system (use --force to override)
> 
> 
> I checked my installation and found this:
> 
> # rpm -ql pacemaker | grep o2cb 
> /usr/share/man/man7/ocf_pacemaker_o2cb.7.gz
> 
> According this, I would expect
> /usr/lib/ocf/resource.d/pacemaker/o2cb but there is no such
> script.

OEL is, shall we say, very similar to RHEL. RHEL doesn't support
OCFS2, so it does not include that RA. It is ironic that OEL doesn't
change that. In any case, you can get the RA from the upstream source:
https://github.com/ClusterLabs/pacemaker/tree/master/extra/resources

> But I succeeded in:
> 
> # pcs resource create --force ResO2CB ocf:pacemaker:o2cb \ op
> monitor interval="10" timeout="30" \ op start interval="0"
> timeout="120" \ op stop interval="0" timeout="120"
> 
> # pcs resource show ... ResO2CB        (ocf::pacemaker:o2cb):
> Stopped ...
> 
> Trying to debug-start:
> 
> # pcs resource debug-start ResO2CB Error performing operation:
> Input/output error
> 
> 
> 
> # rpm -qi pacemaker Name        : pacemaker Version     : 1.1.13 
> Release     : 10.el7 Architecture: x86_64 Install Date: Sa 23 Jul
> 2016 15:23:51 CEST Group       : System Environment/Daemons Size
> : 1400509 License     : GPLv2+ and LGPLv2+ Signature   :
> RSA/SHA256, Sa 21 Nov 2015 19:24:37 CET, Key ID 72f97b74ec551f03 
> Source RPM  : pacemaker-1.1.13-10.el7.src.rpm Build Date  : Sa 21
> Nov 2015 18:10:40 CET ...
> 
> It seems that o2cb script is missing in that RPM. Or did I miss to
> install any package?
> 
> Best Regards
> 
> Thomas Hluchnik
> 
> 
> 
> 
> 
> Am Tuesday 02 August 2016 12:39:27 schrieb Kyle O'Donnell:
>> er forgot
>> 
>> primitive p_o2cb lsb:o2cb \ op monitor interval="10" timeout="30"
>> \ op start interval="0" timeout="120" \ op stop interval="0"
>> timeout="120"
>> 
>> ----- Original Message ----- From: "Kyle O'Donnell"
>> <kyleo at 0b10.mx> To: "users" <users at clusterlabs.org> Sent:
>> Tuesday, August 2, 2016 6:38:11 AM Subject: Re: [ClusterLabs]
>> Bloody Newbie needs help for OCFS2 on	pacemaker+corosync+pcs
>> 
>> primitive mysan ocf:heartbeat:Filesystem \ params
>> device="/dev/myocsdevice" directory="/mymount" fstype="ocfs2"
>> options="rw,noatime" \ op monitor timeout="40" interval="20"
>> depth="0" clone cl_ocfs2mgmt p_o2cb \ meta interleave="true" 
>> clone cl_mysan mysan \ meta target-role="Started" order
>> o_myresource_fs inf: cl_mysan myresource
>> 
>> 
>> ----- Original Message ----- From: thl at it-hluchnik.de To: "users"
>> <users at clusterlabs.org> Sent: Tuesday, August 2, 2016 6:31:44 AM 
>> Subject: [ClusterLabs] Bloody Newbie needs help for OCFS2 on
>> pacemaker+corosync+pcs
>> 
>> Hello everybody, I am new to pacemaker (and to this list), trying
>> to understand pacemaker. For this I created three virtual hosts
>> in my VirtualBox plus four shared disks, attached with each of
>> the three nodes.
>> 
>> I installed Oracle Enterprise Linux 7.1, did a "yum update" and
>> got OEL7.2. Then I created four OCFS2 devices, working fine on
>> all of my three nodes. They are started by systemd, using
>> o2cb.service and ocfs2.service and running fine.
>> 
>> Now I have started with learning pacemaker by "Clusters from
>> Scratch" and meanwhile I have a virtual IP and a Webserver, this
>> works fine so far.
>> 
>> Next I want to control my OCFS2 devices by pacemaker, not by
>> systemd. I searched the net and found some howtos, but they rely
>> on crmsh instead of pcs. Most headaches come from DRBD which I
>> don't understand at all. Why the hell does it seem that I need
>> DRBD for running OCFS2?
>> 
>> Is there anybody who can explain me how to get that running
>> (after disabling o2cb.service & ocfs2.service):
>> 
>> - create a resource which manages and controls o2cb stack -
>> create another resource which manages OCFS2 mountpoints - create
>> constraints for the Web Server (all Apache config / content shall
>> be copied to one of the OCFS2 filesystems)
>> 
>> The Web Server shall be dependent from availability of a mounted
>> OCFS2 device. If it stops working, the Web Server must switch to
>> a node where that mount point is OK.
>> 
>> Thanks in advance for any help
>> 
>> Thomas Hluchnik