I believe the issue is that the xtradb mysqld can't understand the wsrep_urls variable.
120516 15:00:04 mysqld_safe Starting mysqld daemon with databases from /var/lib/mysql
120516 15:00:04 [Note] Flashcache bypass: disabled
120516 15:00:04 [Note] Flashcache setup error is : ioctl failed
120516 15:00:04 [Note] WSREP: Read nil XID from storage engines, skipping position init
120516 15:00:04 [Note] WSREP: wsrep_load(): loading provider library '/usr/lib64/libgalera_smm.so'
120516 15:00:04 [Note] WSREP: wsrep_load(): Galera 2.1dev(r112) by Codership Oy <email address hidden> loaded succesfully.
120516 15:00:04 [Note] WSREP: Found saved state: 00000000-0000-0000-0000-000000000000:-1
120516 15:00:04 [Note] WSREP: Reusing existing '/var/lib/mysql//galera.cache'.
120516 15:00:04 [Note] WSREP: Passing config to GCS: base_host = 10.0.2.15; gcache.dir = /var/lib/mysql/; gcache.keep_pages_size = 0; gcache.mem_size = 0; gcache.name = /var/lib/mysql//galera.cache; gcache.page_size = 128M; gcache.size = 128M; gcs.fc_debug = 0; gcs.fc_factor = 0.5; gcs.fc_limit = 16; gcs.fc_master_slave = NO; gcs.max_packet_size = 64500; gcs.max_throttle = 0.25; gcs.recv_q_hard_limit = 9223372036854775807; gcs.recv_q_soft_limit = 0.25; gcs.sync_donor = NO; replicator.causal_read_timeout = PT30S; replicator.commit_order = 3
120516 15:00:04 [Note] WSREP: Assign initial position for certification: -1, protocol version: -1
120516 15:00:04 [Note] WSREP: wsrep_sst_grab()
120516 15:00:04 [Note] WSREP: Start replication
120516 15:00:04 [Note] WSREP: Setting initial position to 00000000-0000-0000-0000-000000000000:-1
120516 15:00:04 [Note] WSREP: protonet asio version 0
120516 15:00:04 [Note] WSREP: backend: asio
120516 15:00:04 [Note] WSREP: GMCast version 0
120516 15:00:04 [Note] WSREP: (0e4a60e5-9f57-11e1-0800-b7eac9697238, 'tcp://0.0.0.0:4567') listening at tcp://0.0.0.0:4567
120516 15:00:04 [Note] WSREP: (0e4a60e5-9f57-11e1-0800-b7eac9697238, 'tcp://0.0.0.0:4567') multicast: , ttl: 1
120516 15:00:04 [Note] WSREP: EVS version 0
120516 15:00:04 [Note] WSREP: PC version 0
120516 15:00:04 [Note] WSREP: gcomm: connecting to group 'trimethylxanthine', peer '192.168.70.2:'
120516 15:00:04 [Note] WSREP: (0e4a60e5-9f57-11e1-0800-b7eac9697238, 'tcp://0.0.0.0:4567') turning message relay requesting on, nonlive peers: tcp://192.168.70.3:4567
120516 15:00:05 [Note] WSREP: declaring 1a92d07e-9f56-11e1-0800-f59148046fe4 stable
120516 15:00:05 [Note] WSREP: declaring bd9cd0f2-99e4-11e1-0800-6806eb833b63 stable
120516 15:00:05 [Note] WSREP: (0e4a60e5-9f57-11e1-0800-b7eac9697238, 'tcp://0.0.0.0:4567') turning message relay requesting off
120516 15:00:05 [Note] WSREP: view(view_id(PRIM,0e4a60e5-9f57-11e1-0800-b7eac9697238,10) memb {
0e4a60e5-9f57-11e1-0800-b7eac9697238,
1a92d07e-9f56-11e1-0800-f59148046fe4,
bd9cd0f2-99e4-11e1-0800-6806eb833b63,
} joined {
} left {
} partitioned {
})
120516 15:00:05 [Note] WSREP: gcomm: connected
120516 15:00:05 [Note] WSREP: Changing maximum packet size to 64500, resulting msg size: 32636
120516 15:00:05 [Note] WSREP: Shifting CLOSED -> OPEN (TO: 0)
120516 15:00:05 [Note] WSREP: Opened channel 'trimethylxanthine'
120516 15:00:05 [Note] WSREP: Waiting for SST to complete.
120516 15:00:05 [Note] WSREP: New COMPONENT: primary = yes, bootstrap = no, my_idx = 0, memb_num = 3
120516 15:00:05 [Note] WSREP: STATE_EXCHANGE: sent state UUID: 0ee3aa83-9f57-11e1-0800-73682d4a05de
120516 15:00:05 [Note] WSREP: STATE EXCHANGE: sent state msg: 0ee3aa83-9f57-11e1-0800-73682d4a05de
120516 15:00:05 [Note] WSREP: STATE EXCHANGE: got state msg: 0ee3aa83-9f57-11e1-0800-73682d4a05de from 0 (percona3)
120516 15:00:05 [Note] WSREP: STATE EXCHANGE: got state msg: 0ee3aa83-9f57-11e1-0800-73682d4a05de from 1 (percona1)
120516 15:00:05 [Note] WSREP: STATE EXCHANGE: got state msg: 0ee3aa83-9f57-11e1-0800-73682d4a05de from 2 (percona2)
120516 15:00:05 [Note] WSREP: Quorum results:
version = 2,
component = PRIMARY,
conf_id = 7,
members = 2/3 (joined/total),
act_id = 772,
last_appl. = -1,
protocols = 0/3/1 (gcs/repl/appl),
group UUID = c19f6c17-99e2-11e1-0800-861728b65ef4
120516 15:00:05 [Note] WSREP: Flow-control interval: [14, 28]
120516 15:00:05 [Note] WSREP: Shifting OPEN -> PRIMARY (TO: 772)
120516 15:00:05 [Note] WSREP: State transfer required:
Group state: c19f6c17-99e2-11e1-0800-861728b65ef4:772
Local state: 00000000-0000-0000-0000-000000000000:-1
120516 15:00:05 [Note] WSREP: New cluster view: global state: c19f6c17-99e2-11e1-0800-861728b65ef4:772, view# 8: Primary, number of nodes: 3, my index: 0, protocol version 1
120516 15:00:05 [Warning] WSREP: Gap in state sequence. Need state transfer.
120516 15:00:07 [Note] WSREP: Running: 'wsrep_sst_xtrabackup 'joiner' '192.168.70.4' '' '/var/lib/mysql/' '/etc/my.cnf' '26692' 2>sst.err'
120516 15:00:07 [Note] WSREP: Prepared SST request: xtrabackup|192.168.70.4:4444/xtrabackup_sst
120516 15:00:07 [Note] WSREP: wsrep_notify_cmd is not defined, skipping notification.
120516 15:00:07 [Note] WSREP: Assign initial position for certification: 772, protocol version: 2
120516 15:00:07 [Warning] WSREP: Failed to prepare for incremental state transfer: Local state UUID (00000000-0000-0000-0000-000000000000) does not match group state UUID (c19f6c17-99e2-11e1-0800-861728b65ef4): 1 (Operation not permitted)
at galera/src/replicator_str.cpp:prepare_for_IST():439. IST will be unavailable.
120516 15:00:07 [Note] WSREP: Node 0 (percona3) requested state transfer from '*any*'. Selected 1 (percona1)(SYNCED) as donor.
120516 15:00:07 [Note] WSREP: Shifting PRIMARY -> JOINER (TO: 772)
120516 15:00:07 [Note] WSREP: Requesting state transfer: success, donor: 1
120516 15:01:44 [Note] WSREP: 1 (percona1): State transfer to 0 (percona3) complete.
120516 15:01:44 [Note] WSREP: Member 1 (percona1) synced with group.
120516 15:01:56 [Note] WSREP: SST complete, seqno: 772
120516 15:01:56 [Warning] No argument was provided to --log-bin, and --log-bin-index was not used; so replication may break when this MySQL server acts as a master and has his hostname changed!! Please use '--log-bin=percona3-bin' to avoid this problem.
120516 15:01:56 [Note] Plugin 'FEDERATED' is disabled.
120516 15:01:56 InnoDB: The InnoDB memory heap is disabled
120516 15:01:56 InnoDB: Mutexes and rw_locks use GCC atomic builtins
120516 15:01:56 InnoDB: Compressed tables use zlib 1.2.3
120516 15:01:56 InnoDB: Using Linux native AIO
120516 15:01:56 InnoDB: Initializing buffer pool, size = 128.0M
120516 15:01:56 InnoDB: Completed initialization of buffer pool
120516 15:01:56 InnoDB: highest supported file format is Barracuda.
120516 15:01:56 InnoDB: Waiting for the background threads to start
120516 15:01:57 Percona XtraDB (http://www.percona.com) 1.1.8-rel25.3 started; log sequence number 2173783564
120516 15:01:57 [ERROR] /usr/sbin/mysqld: unknown variable 'wsrep_urls=gcomm://192.168.70.2,gcomm://192.168.70.3,gcomm://'
120516 15:01:57 [ERROR] Aborting
120516 15:01:59 [Note] WSREP: Closing send monitor...
120516 15:01:59 [Note] WSREP: Closed send monitor.
120516 15:01:59 [Note] WSREP: gcomm: terminating thread
120516 15:01:59 [Note] WSREP: gcomm: joining thread
120516 15:01:59 [Note] WSREP: gcomm: closing backend
120516 15:01:59 [Note] WSREP: view(view_id(NON_PRIM,0e4a60e5-9f57-11e1-0800-b7eac9697238,10) memb {
0e4a60e5-9f57-11e1-0800-b7eac9697238,
} joined {
} left {
} partitioned {
1a92d07e-9f56-11e1-0800-f59148046fe4,
bd9cd0f2-99e4-11e1-0800-6806eb833b63,
})
120516 15:01:59 [Note] WSREP: New COMPONENT: primary = no, bootstrap = no, my_idx = 0, memb_num = 1
120516 15:01:59 [Note] WSREP: view((empty))
120516 15:01:59 [Note] WSREP: gcomm: closed
120516 15:01:59 [Note] WSREP: Flow-control interval: [8, 16]
120516 15:01:59 [Note] WSREP: Received NON-PRIMARY.
120516 15:01:59 [Note] WSREP: Shifting JOINER -> OPEN (TO: 772)
120516 15:01:59 [Note] WSREP: Received self-leave message.
120516 15:01:59 [Note] WSREP: Flow-control interval: [0, 0]
120516 15:01:59 [Note] WSREP: Received SELF-LEAVE. Closing connection.
120516 15:01:59 [Note] WSREP: Shifting OPEN -> CLOSED (TO: 772)
120516 15:01:59 [Note] WSREP: RECV thread exiting 0: Success
120516 15:01:59 [Note] WSREP: recv_thread() joined.
120516 15:01:59 [Note] WSREP: Closing slave action queue.
120516 15:01:59 [Note] WSREP: Service disconnected.
120516 15:01:59 [Note] WSREP: rollbacker thread exiting
120516 15:02:00 [Note] WSREP: Some threads may fail to exit.
120516 15:02:00 InnoDB: Starting shutdown...
120516 15:02:02 InnoDB: Shutdown completed; log sequence number 2173783564
120516 15:02:02 [Note] /usr/sbin/mysqld: Shutdown complete
Error in my_thread_global_end(): 1 threads didn't exit
120516 15:02:07 mysqld_safe mysqld from pid file /var/lib/mysql/percona3.pid ended
# cat /etc/my.cnf
[mysqld]
datadir=/var/lib/mysql
user=mysql
log_error=error.log
binlog_format=ROW
wsrep_provider=/usr/lib64/libgalera_smm.so
wsrep_urls=gcomm://192.168.70.2,gcomm://192.168.70.3,gcomm://
#wsrep_cluster_address=gcomm://
wsrep_sst_receive_address=192.168.70.4
wsrep_node_incoming_address=192.168.70.4
wsrep_slave_threads=2
wsrep_cluster_name=trimethylxanthine
#wsrep_sst_method=rsync
wsrep_sst_method=xtrabackup
wsrep_node_name=percona3
innodb_locks_unsafe_for_binlog=1
innodb_autoinc_lock_mode=2
innodb_log_file_size=64M
bind-address=192.168.70.4
server-id=3
log-bin
log-slave-updates
[mysql]
user=root
prompt="percona3 mysql> "
wsrep_urls= parameter is for [mysqld_safe] section.