I had the same problem.
I found that one of ccsd service was already running.
[root@vm1 ~]# ps -ef | grep -i ccsd
root 6020 1 0 19:13 ? 00:00:00 /sbin/ccsd
root 6078 5888 0 19:14 pts/2 00:00:00 grep -i ccsd
[root@vm1 ~]# kill -9 6020
then restart cman. It worked.
minimum cluster configuration:
[root@vm1 cluster]# cat /etc/cluster/cluster.conf
<?xml version="1.0" ?>
<cluster config_version="2" name="new_cluster">
<fence_daemon post_fail_delay="0" post_join_delay="3"/>
<clusternodes>
<clusternode name="vm1" nodeid="1"/>
</clusternodes>
<cman/>
<fencedevices/>
<rm>
<failoverdomains/>
<resources/>
</rm>
</cluster>
