No GTID in xtrabackup_binlog_info

Hi,

I'm setting up a slave for a multi-master cluster, following this post: https://mariadb.com/kb/en/library/using-mariadb-replication-with-mariadb-galera-cluster-configuring-mariadb-r/#start-replication-on-the-new-slave The cluster is up and running, but I can't manage to obtain the GTID to start the slave. The backup from one of the masters is done correctly, then prepared, the restored on the slave, however I can't find the GTID as it is not present in the xtrabackup_binlog_info.

cat /var/mariadb/backup/xtrabackup_binlog_info
binlog.000006	59317700

When I try to find more information with the mysql variables on the master, I don't get much more:

MariaDB [(none)]> show master status \G
*************************** 1. row ***************************
            File: binlog.000004
        Position: 69145989
    Binlog_Do_DB:
Binlog_Ignore_DB:
1 row in set (0.000 sec)

MariaDB [(none)]> show variables like '%binlog%';
+-----------------------------------------+----------------------+
| Variable_name                           | Value                |
+-----------------------------------------+----------------------+
| binlog_annotate_row_events              | ON                   |
| binlog_cache_size                       | 32768                |
| binlog_checksum                         | CRC32                |
| binlog_commit_wait_count                | 0                    |
| binlog_commit_wait_usec                 | 100000               |
| binlog_direct_non_transactional_updates | OFF                  |
| binlog_file_cache_size                  | 16384                |
| binlog_format                           | ROW                  |
| binlog_optimize_thread_scheduling       | ON                   |
| binlog_row_image                        | FULL                 |
| binlog_stmt_cache_size                  | 32768                |
| encrypt_binlog                          | OFF                  |
| gtid_binlog_pos                         | 0-4-57912            |
| gtid_binlog_state                       | 0-3-29474,0-4-57912  |
| innodb_locks_unsafe_for_binlog          | OFF                  |
| max_binlog_cache_size                   | 18446744073709547520 |
| max_binlog_size                         | 1073741824           |
| max_binlog_stmt_cache_size              | 18446744073709547520 |
| read_binlog_speed_limit                 | 0                    |
| sync_binlog                             | 0                    |
| wsrep_forced_binlog_format              | NONE                 |


MariaDB [(none)]> SELECT @@GLOBAL.gtid_current_pos\G
*************************** 1. row ***************************
@@GLOBAL.gtid_current_pos:

I think that I have all the options set correctly, but it doesn't seem to be running correctly. Here is a copy of one of my masters' my.cnf:

[MYSQLD]
bind-address = 172.16.0.12
user=mysql
basedir=/usr/
datadir=/var/lib/mysql
socket=/var/run/mysqld/mysqld.sock
pid_file=mysqld.pid
port=3306

### LOG OPTIONS
log_error=error.log
slow_query_log = 1
slow_query_log_file = /var/log/mysql/mariadb-slow.log
long_query_time = 5
log_slow_verbosity  = query_plan

### INNODB OPTIONS
innodb_buffer_pool_size=11489M
#obsolete in mariadb 10.2
#innodb_additional_mem_pool_size=20M
innodb_flush_log_at_trx_commit=0
innodb_file_per_table=1
innodb_data_file_path = ibdata1:100M:autoextend
## You may want to tune the below depending on number of cores and disk sub
innodb_read_io_threads=4
innodb_write_io_threads=4
innodb_doublewrite=1
innodb_log_file_size=1024M
innodb_log_buffer_size=96M
innodb_buffer_pool_instances=8
innodb_log_files_in_group=2
innodb_thread_concurrency=0
innodb_file_format=barracuda
innodb_flush_method = O_DIRECT
innodb_autoinc_lock_mode=2
## avoid statistics update when doing e.g show tables
innodb_stats_on_metadata=0
# Obsolete, set by default if supported and unset if unsupported
#engine_condition_pushdown=1
default_storage_engine=innodb

##
## WSREP options
##

# Full path to wsrep provider library or 'none'
wsrep_on=ON
wsrep_provider=/usr/lib/galera/libgalera_smm.so
wsrep_cluster_name="cluster1"
wsrep_node_name='server1'
wsrep_node_address='172.16.0.12'
wsrep_provider_options="gcache.size=128M;gcache.page_size=1G;base_host=172.16.0.12;gmcast.listen_addr=tcp://172.16.0.12:4567"
wsrep_cluster_address="gcomm://172.16.0.12,172.16.0.11,172.16.0.9"

wsrep_node_incoming_address='172.16.0.12'
wsrep_slave_threads=16

# CHARACTER SET
#collation_server = utf8_unicode_ci
#init_connect='SET NAMES utf8'
#character_set_server = utf8

# REPLICATION SPECIFIC - GENERAL
#server_id must be unique across all mysql servers participating in replication.
server_id=3
# auto_increment_increment corresponds to the number of masters in the multimaster cluster
auto_increment_increment=3
# auto_increment_offset avoids issues of conflicts between two simultaneous writes in two masters.
auto_increment_offset=3
# REPLICATION SPECIFIC
binlog_format=ROW
log_bin=binlog
#relay_log=relay-bin
#expire_logs_days=7
# OTHER THINGS, BUFFERS ETC
key_buffer_size = 24M
tmp_table_size = 64M
max_heap_table_size = 64M
max_allowed_packet = 512M
#sort_buffer_size = 256K
#read_buffer_size = 256K
#read_rnd_buffer_size = 512K
#myisam_sort_buffer_size = 8M
skip_name_resolve
memlock=0
sysdate_is_now=1
max_connections=200
thread_cache_size=512
query_cache_type = 0
query_cache_size = 0
table_open_cache=1024
lower_case_table_names=0

# DBUG options for wsrep provider
#wsrep_dbug_option

# Generate fake primary keys for non-PK tables (required for multi-master
# and parallel applying operation)
wsrep_certify_nonPK=1

# Location of the directory with data files. Needed for non-mysqldump
# state snapshot transfers. Defaults to mysql_real_data_home.
#wsrep_data_home_dir=

# Maximum number of rows in write set
wsrep_max_ws_rows=131072

# Maximum size of write set
wsrep_max_ws_size=1073741824

# to enable debug level logging, set this to 1
wsrep_debug=0

# convert locking sessions into transactions
wsrep_convert_LOCK_to_trx=0

# how many times to retry deadlocked autocommits
wsrep_retry_autocommit=2

# change auto_increment_increment and auto_increment_offset automatically
wsrep_auto_increment_control=1

# replicate myisam
wsrep_replicate_myisam=1
# retry autoinc insert, which failed for duplicate key error
wsrep_drupal_282555_workaround=0

# enable "strictly synchronous" semantics for read operations
wsrep_causal_reads=0

# Command to call when node status or cluster membership changes.
# Will be passed all or some of the following options:
# --status  - new status of this node
# --uuid    - UUID of the cluster
# --primary - whether the component is primary or not ("yes"/"no")
# --members - comma-separated list of members
# --index   - index of this node in the list
#wsrep_notify_cmd=

##
## WSREP State Transfer options
##

# State Snapshot Transfer method
# ClusterControl currently DOES NOT support wsrep_sst_method=mysqldump
#wsrep_sst_method=rsync
#wsrep_sst_method=xtrabackup-v2
wsrep_sst_method=mariabackup

# Address on THIS node to receive SST at. DON'T SET IT TO DONOR ADDRESS!!!
# (SST method dependent. Defaults to the first IP of the first interface)
wsrep_sst_receive_address=172.16.0.12

# SST authentication string. This will be used to send SST to joining nodes.
# Depends on SST method. For mysqldump method it is root:<root password>
wsrep_sst_auth=<redacted>:<redacted>

# Desired SST donor name.
#wsrep_sst_donor=

# Protocol version to use
# wsrep_protocol_version=

# GTIDs for replication between masters and slave
wsrep_gtid_mode=ON
# wsrep_gtid_domain_id must be the same on all nodes
wsrep_gtid_domain_id=42
#
log_slave_updates=ON
# gtid_domain_id must be distinct on each node AND distinct from wsrep_gtid_domain_id
gtid_domain_id=11

[MYSQL]
socket=/var/run/mysqld/mysqld.sock
#default_character_set=utf8

[client]
socket=/var/run/mysqld/mysqld.sock
#default_character_set=utf8

[mysqldump]
max_allowed_packet = 512M
#default_character_set=utf8

[MYSQLD_SAFE]
pid_file=mysqld.pid
log_error=error.log
basedir=/usr/
datadir=/var/lib/mysql

I'm a bit lost, do someone see something evident that I missed? Thanks,

Simon