[Samba] CTDB+GFS2+CMAN. clean_start="0" or clean_start="1"?

[Yauheni Labko]

Hi everybody,

I have tested CTDB+GFS2+CMAN under Debian. It works good but I do not 
understand some points.
It is possible to run the CTDB defining it under services section in 
cluster.conf but running it on the second node shuts down the process at the 
first one. My CTDB configuration implies 2 active-active nodes.

Does CTDB care if the node starts with clean_start="0" or clean_start="1"? man 
fenced says this is a safe way especially during startup because it prevents 
a data corruption if a node was dead for some reason. From my understanding 
CTDB uses CMAN only as "module" to get access to gfs/gfs2 partitions. Or 
maybe it is better to look at GPFS and LustreFS?

Could anybody show the working configuration of cluster.conf for 
CTDB+GFS2+CMAN? 

I used the following cluster.conf and ctd conf:

<?xml version="1.0"?>
<cluster name="smb-cluster" config_version="8">
  <fence_daemon clean_start="0" post_fail_delay="0" post_join_delay="3"/>
  <cman expected_votes="1" two_node="1"/>
  <cman cluster_id="101"/>
  <clusternodes>
    <clusternode name="smb01" votes="1" nodeid="1">
      <fence>
        <!-- Handle fencing manually -->
        <method name="human">
          <device name="human" nodename="smb01"/>
        </method>
      </fence>
    </clusternode>
    <clusternode name="smb02" votes="1" nodeid="2">
      <fence>
        <!-- Handle fencing manually -->
        <method name="human">
          <device name="human" nodename="smb02"/>
        </method>
      </fence>
    </clusternode>
  </clusternodes>
  <fencedevices>
    <!-- Define manual fencing -->
    <fencedevice name="human" agent="fence_manual"/>
    <!-- Define ilo fencing -->
    <fencedevice name="ilo" agent="fence_ilo" login="admin" password="foo"/>
  </fencedevices>
</cluster>

# Options to ctdbd. This is read by /etc/init.d/ctdb
CTDB_RECOVERY_LOCK="/smb-ctdb/.ctdb_locking"
CTDB_PUBLIC_INTERFACE=eth2
CTDB_PUBLIC_ADDRESSES=/etc/ctdb/public_addresses
CTDB_MANAGES_SAMBA=yes
CTDB_INIT_STYLE=ubuntu
CTDB_NODES=/etc/ctdb/nodes
CTDB_NOTIFY_SCRIPT=/etc/ctdb/notify.sh
CTDB_DBDIR=/var/ctdb
CTDB_DBDIR_PERSISTENT=/var/ctdb/persistent
CTDB_SOCKET=/tmp/ctdb.socket
CTDB_LOGFILE=/var/log/ctdb.log
CTDB_DEBUGLEVEL=2

Yauheni Labko (Eugene Lobko)
Junior System Administrator
Chapdelaine & Co.
(212)208-9150