Setting up CTDB on OCFS2 and VMs ...

[Rowland Penny]

On 06/12/14 15:24, Richard Sharpe wrote:
> On Sat, Dec 6, 2014 at 2:58 AM, Rowland Penny <repenny241155 at gmail.com> wrote:
>> On 04/12/14 18:08, Richard Sharpe wrote:
>>> Hi folks,
>>>
>>> Here are the steps I used, as far as I can remember them. Please
>>> excuse any mistakes and be prepared to think for yourself when
>>> following them.
>>>
>>> 1. Create two VirtualBox VMs with enough memory and disk for your
>>> Linux Distro. I used CentOS 6.6 with 4GB and 20GB. (I actually
>>> installed CentOS 6.3 and upgraded because I had the ISO handy.) You
>>> will also need an extra interface on each VM for the clustering
>>> private network. I set them to an internal type.
>>>
>>> 2. Because you will need a shared disk, create one:
>>>
>>> vboxmanage createhd --filename ~/VirtualBox\ VMs/SharedHD1 --size
>>> 10240 --variant Fixed --format VDI # Creates a 10GB fixed sized disk
>>> vboxmanage modifyhd 22ae1fcc-fda7-4e42-be9f-3b8bd7fc0c0e --type
>>> shareable # Make it shareable.
>>>
>>> Note, for that second command use the UUID for your disk which you can
>>> find with:
>>>
>>> vboxmanage list hdds --brief
>>>
>>> Also, use the GUI to add the shared disk to both VMs.
>>>
>>> 3. Install the OS on each of the VMs.
>>>
>>> 4. I installed a bunch of clustering RPMs next:
>>>
>>> yum install openais corosync pacemaker-libs pacemaker-libs-devel gcc
>>> corosync-devel openais-devel rpm-build e2fsprogs-devel libuuid-devel
>>> git pygtk2 python-devel readline-devel clusterlib-devel redhat-lsb
>>> sqlite-devel gnutls-devel byacc flex nss-devel
>>>
>>> It is not clear to me that openais was needed, for example
>>>
>>> 5. Next I installed Oracles UEK and ocfs2-tools
>>>
>>> wget http://public-yum.oracle.com/public-yum-ol6.repo /etc/yum.repos.d
>>> wget http://public-yum.oracle.com/RPM-GPG-KEY-oracle-ol6 -O
>>> /etc/pki/rpm-gpg/RPM-GPG-KEY-oracle
>>> yum install kernel-uek kernel-uek-devel
>>> yum install ocfs2-tools
>>> yum install openaislib-devel corosync-devel # It is not clear that I
>>> needed to install the first
>>>
>>> echo 'KERNEL=="ocfs2_control", NAME="misc/ocfs2_control", MODE="0660"'
>>>> /etc/udev/rules.d/99-ocfs2_control.rules
>>> reboot # on each
>>>
>>> 6. Configure cman and pacemaker
>>>
>>> # configure corosync first
>>> cp /etc/corosync/corosync.conf.example /etc/corosync/corosync.conf
>>>
>>> # Make sure that bindnetaddr is defined and points to your private
>>> interface. I set it to 192.168.122.0
>>>
>>> # Make sure that the mcastaddr is defined. I used 239.255.1.1
>>> # make sure that the mcastport is defined. I used 5405
>>>
>>> # Copy that file to the other node.
>>> scp /etc/corosync/corosync.conf root at 172.16.170.6:/etc/corosync
>>>
>>> /etc/init.d/pacemaker stop  # Stop these in case they were running
>>> /etc/init.d/corosync stop # Same here
>>>
>>> yum install ccs pcs
>>>
>>> # Create a cluster
>>>
>>> ccs -f /etc/cluster/cluster.conf --createcluster ctdbdemo
>>> ccs -f /etc/cluster/cluster.conf --addnode ocfs2-1
>>> ccs -f /etc/cluster/cluster.conf --addnode ocfs2-2
>>> ccs -f /etc/cluster/cluster.conf --addfencedev pcmk agent=fence_pcmk
>>> ccs -f /etc/cluster/cluster.conf --addmethod pcmk-redirect ocfs2-1
>>> ccs -f /etc/cluster/cluster.conf --addmethod pcmk-redirect ocfs2-2
>>> ccs -f /etc/cluster/cluster.conf --addfenceinst pcmk ocfs2-1
>>> pcmk-redirect port=ocfs2-1
>>> ccs -f /etc/cluster/cluster.conf --addfenceinst pcmk ocfs2-2
>>> pcmk-redirect port=ocfs2-2
>>>
>>> # Copy the cluster config file to the other node:
>>> scp /etc/cluster/cluster.conf root at 172.16.170.6:/etc/cluster
>>>
>>> #Now turn off NetworkManager:
>>> chkconfig NetworkManager off
>>> service NetworkManager stop
>>>
>>> # now start the cluster
>>> service cman start
>>> pcs property set stonith-enabled=false
>>> service pacemaker start
>>>
>>> # Also start it on the other node(s).
>>>
>>> # Now check the status:
>>>       [root at ocfs2-1 ~]# crm_mon -1
>>>       Last updated: Thu Dec  4 09:40:16 2014
>>>       Last change: Tue Dec  2 10:12:50 2014
>>>       Stack: cman
>>>       Current DC: ocfs2-2 - partition with quorum
>>>       Version: 1.1.11-97629de
>>>       2 Nodes configured
>>>       0 Resources configured
>>>
>>>
>>>       Online: [ ocfs2-1 ocfs2-2 ]
>>>
>>> If you do not see all the other nodes online, then you have to debug
>>> the problem.
>>>
>>> These are essentially the steps from here:
>>> http://clusterlabs.org/quickstart-redhat.html
>>>
>>> 7. Configure the Oracle cluster
>>>
>>> o2cb add-cluster ctdbdemo
>>> o2cb add-node --ip 192.168.122.10 --port --number 1 ctdbdemo ocfs2-1
>>> o2cb add-node --ip 192.168.122.10 --port 7777 --number 1 ctdbdemo ocfs2-1
>>> o2cb add-node --ip 192.168.122.11 --port 7777 --number 2 ctdbdemo ocfs2-2
>>>
>>> service o2cb configure # This step will fail claiming that it can't
>>> find /sbin/ocfs2_controld.cman
>>> #
>>> # However, it does the important stuff.
>>> #
>>> # NOTE, during the configuration steps you MUST SELECT cman AS THE
>>> CLUSTER STACK!
>>> #
>>>
>>> 8. Find and install the ocfs2-tools git repos
>>>
>>> git clone git://oss.oracle.com/git/ocfs2-tools.git ocfs2-tools
>>>
>>> # install stuff needed
>>> yum install libaio libaio-devel
>>> yum install pacemaker-libs-devel
>>>
>>> # Now build
>>> cd ocfs2-tools
>>> ./configure
>>> make
>>>
>>> # This will likely fail. If it first fails complaining about
>>> xml/tree.h then you can do the following:
>>> CPPFLAGS='-I/usr/include/libxml2' ./configure
>>> make
>>>
>>> # It might complain again complaining about some AIS include files that
>>> are no
>>> # longer in the packages installed. That is OK. It should have built
>>> ocfs2_controld.cman,
>>> # so copy it where it needs to be:
>>>
>>> cp ocfs2_controld.cman /usr/sbin/
>>> scp ocfs2_controld.cman root at 172.16.170.6:/usr/sbin/
>>>
>>> # Now stop those two you started and start everything:
>>>
>>> service pacemaker stop
>>> service cman stop
>>>
>>> service cman start
>>> service o2cb start
>>> service pacemaker start
>>>
>>> 8. Create the shared shared file system on one node:
>>>
>>> mkfs.ocfs2 -L CTDBdemocommon --cluster-name ctdbdemo --cluster-stack
>>> ocfs2 -N 4 /dev/sdb
>>>
>>> 9. Mount it on both and ensure that you can create files/dirs on one
>>> node and see them on the other node.
>>>
>>> 10. Install ctdb and samba
>>>
>>> 11. Configure samba for the domain you want to join
>>>
>>> # Make sure you have clustering = yes and the other things you need.
>>>
>>> 12. Configure ctdb (/etc/sysconfig/ctdb) and make sure that you disable
>>> winbindd
>>>
>>> 13. Start ctdb on all nodes
>>>
>>> # You must have ctdb started so that the secrets file will get distributed
>>>
>>> 14. join the domain
>>>
>>> 15. Enable winbindd in the ctdb config
>>>
>>> 16. Restart ctdb on all nodes
>>>
>>> At this point you should be done. The steps you need might vary.
>>>
>>> I have limited time to help you with this.
>>>
>> OK, I have followed Richards 'howto' but using Debian 7.7 instead of Centos,
>> I also used the standard Debian kernel. I have got up to step 9, after a bit
>> of a battle and it all started so well. :-)
>>
>> Most of the required packages are available from the repos:
>>
>> apt-get install openais corosync pacemaker cman ocfs2-tools-cman
>> ocfs2-tools-pacemaker
>>
>> Unfortunately, it turned out that pacemaker is not built to use the cman
>> stack, so I had to rebuild it
>>
>> Next problem, ccs and pcs are not available, so I had to download & build
>> them, though even this was not without problems, ccs put
>> 'empty_cluster.conf' in the wrong place and pcs is hardwired to use
>> /usr/libexec
>>
>> Next problem 'o2cb' appears to be called 'o2cb_ctl' on Debian.
>>
>> Started cman, o2cb and pacemaker (first time round, this is where I found
>> that pacemaker wouldn't work with cman)
>>
>> I then created the shared shared file system and mounted it on both nodes
> OK, looks like you got the real stuff done.
>
>> At this point I have a shared cluster, but in a way that I cannot see any
>> sane sysadmin using. Most of the software is heavily modified or not
>> available from the distros repos. I am going to have to stop and think about
>> this and see if there is a Debian way of doing this, without modifying
>> anything or using anything that is not available from a repo.

OK, I am getting closer :-)

I have got it working with just packages available from Debian repos, 
apart from 'ccs', once I find  a replacement for this, I will move onto 
ctdb & samba.

Rowland

> Indeed, I cannot imagine anyone using the approach I used for
> production as well. Having stuff that needs to be rebuilt is not a
> good idea, and it would be useful to get a minimal complete set of
> RPMs together and fix ocfs2-tools so that the correct things are there
> and the build works out what is needed.
>
> However, I only currently need the OCFS2 setup for testing purposes
> while we get our file system supporting FCNTL locks and so I have a
> reference to work with.
>
> Not sure if I have the time to fix anything.
>