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MariaDB : Galera Cluster
2019/08/02
 
Configure MariaDB Galera Cluster.
All nodes in cluster become Master-Server in this configuration.
[1]
[2] Configure a 1st node like follows.
root@www:~#
vi /etc/mysql/mariadb.conf.d/50-server.cnf
# line 28: comment out

#
bind-address = 127.0.0.1
# add to the end

[galera]
wsrep_on=ON
wsrep_provider=/usr/lib/galera/libgalera_smm.so
wsrep_cluster_address=gcomm://
binlog_format=row
default_storage_engine=InnoDB
innodb_autoinc_lock_mode=2
bind-address=0.0.0.0
# any cluster name
wsrep_cluster_name="MariaDB_Cluster"
# own IP address
wsrep_node_address="10.0.0.31"

root@www:~#
galera_new_cluster

root@www:~#
systemctl restart mariadb

[3] Configure other nodes except a 1st node.
root@node01:~#
vi /etc/mysql/mariadb.conf.d/50-server.cnf
# line 28: comment out

#
bind-address = 127.0.0.1
# add to the end

[galera]
wsrep_on=ON
wsrep_provider=/usr/lib/galera/libgalera_smm.so
# specify all nodes in cluster
wsrep_cluster_address="gcomm://10.0.0.31,10.0.0.51"
binlog_format=row
default_storage_engine=InnoDB
innodb_autoinc_lock_mode=2
bind-address=0.0.0.0
# any cluster name
wsrep_cluster_name="MariaDB_Cluster"
# own IP address
wsrep_node_address="10.0.0.51"

root@node01:~#
systemctl restart mariadb

[4] The Cluster settings is OK, Make sute the status like follows. It's OK if [wsrep_local_state_comment] is [Synced].
root@node01:~#
mysql -u root -p

Enter password:
Welcome to the MariaDB monitor.  Commands end with ; or \g.
Your MariaDB connection id is 38
Server version: 10.3.15-MariaDB-1 Debian 10

Copyright (c) 2000, 2018, Oracle, MariaDB Corporation Ab and others.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

MariaDB [(none)]> show status like 'wsrep_%'; 
+------------------------------+---------------------------------------------------+
| Variable_name                | Value                                             |
+------------------------------+---------------------------------------------------+
| wsrep_apply_oooe             | 0.000000                                          |
| wsrep_apply_oool             | 0.000000                                          |
| wsrep_apply_window           | 0.000000                                          |
| wsrep_causal_reads           | 0                                                 |
| wsrep_cert_deps_distance     | 0.000000                                          |
| wsrep_cert_index_size        | 0                                                 |
| wsrep_cert_interval          | 0.000000                                          |
| wsrep_cluster_conf_id        | 2                                                 |
| wsrep_cluster_size           | 2                                                 |
| wsrep_cluster_state_uuid     | 9ef6c32b-b4c4-11e9-97d4-6a3d56e80169              |
| wsrep_cluster_status         | Primary                                           |
| wsrep_cluster_weight         | 2                                                 |
| wsrep_commit_oooe            | 0.000000                                          |
| wsrep_commit_oool            | 0.000000                                          |
| wsrep_commit_window          | 0.000000                                          |
| wsrep_connected              | ON                                                |
| wsrep_desync_count           | 0                                                 |
| wsrep_evs_delayed            |                                                   |
| wsrep_evs_evict_list         |                                                   |
| wsrep_evs_repl_latency       | 0.000397028/0.000799161/0.000957393/0.000207351/5 |
| wsrep_evs_state              | OPERATIONAL                                       |
| wsrep_flow_control_paused    | 0.000000                                          |
| wsrep_flow_control_paused_ns | 0                                                 |
| wsrep_flow_control_recv      | 0                                                 |
| wsrep_flow_control_sent      | 0                                                 |
| wsrep_gcomm_uuid             | c7717123-b4c4-11e9-b416-0adc197bd578              |
| wsrep_incoming_addresses     | 10.0.0.31:3306,10.0.0.51:3306                     |
| wsrep_last_committed         | 0                                                 |
| wsrep_local_bf_aborts        | 0                                                 |
| wsrep_local_cached_downto    | 18446744073709551615                              |
| wsrep_local_cert_failures    | 0                                                 |
| wsrep_local_commits          | 0                                                 |
| wsrep_local_index            | 1                                                 |
| wsrep_local_recv_queue       | 0                                                 |
| wsrep_local_recv_queue_avg   | 0.000000                                          |
| wsrep_local_recv_queue_max   | 1                                                 |
| wsrep_local_recv_queue_min   | 0                                                 |
| wsrep_local_replays          | 0                                                 |
| wsrep_local_send_queue       | 0                                                 |
| wsrep_local_send_queue_avg   | 0.000000                                          |
| wsrep_local_send_queue_max   | 1                                                 |
| wsrep_local_send_queue_min   | 0                                                 |
| wsrep_local_state            | 4                                                 |
| wsrep_local_state_comment    | Synced                                            |
| wsrep_local_state_uuid       | 9ef6c32b-b4c4-11e9-97d4-6a3d56e80169              |
| wsrep_open_connections       | 0                                                 |
| wsrep_open_transactions      | 0                                                 |
| wsrep_protocol_version       | 9                                                 |
| wsrep_provider_name          | Galera                                            |
| wsrep_provider_vendor        | Codership Oy <info@codership.com>                 |
| wsrep_provider_version       | 3.25(rddf9876)                                    |
| wsrep_ready                  | ON                                                |
| wsrep_received               | 3                                                 |
| wsrep_received_bytes         | 231                                               |
| wsrep_repl_data_bytes        | 0                                                 |
| wsrep_repl_keys              | 0                                                 |
| wsrep_repl_keys_bytes        | 0                                                 |
| wsrep_repl_other_bytes       | 0                                                 |
| wsrep_replicated             | 0                                                 |
| wsrep_replicated_bytes       | 0                                                 |
| wsrep_thread_count           | 2                                                 |
+------------------------------+---------------------------------------------------+
61 rows in set (0.003 sec)
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