Percona xtradb cluster node2 won't start
The log entries

2015-06-08 18:43:03 5977 [ERROR] WSREP: wsrep_load(): dlopen(): /usr/lib/galera3/libgalera_ssm.so: cannot open shared object file: No such file or directory
2015-06-08 18:43:03 5977 [ERROR] WSREP: wsrep_load(/usr/lib/galera3/libgalera_ssm.so) failed: Invalid argument (22). Reverting to no provider.


show that MySQL cannot find the file /usr/lib/galera3/libgalera_ssm.so so it cannot use it as a WSREP provider.  Check that this file exists and is accessible.  If your system is 64-bit, it might be in /usr/lib64/.

Also please post the error message you get when starting the node -- without reading the exact error message it's a shot in the dark.