Ubuntu 22.04
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MariaDB 10.6 : Galera Cluster
2022/05/13
 
Configure MariaDB Galera Cluster.
All nodes in cluster become Master-Server on this Multi-Master configuration.
[1]
[2] Configure a 1st node like follows.
root@www:~#
systemctl stop mariadb

root@www:~#
vi /etc/mysql/mariadb.conf.d/50-server.cnf
# line 27 : 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:~#
vi /etc/mysql/mariadb.conf.d/50-server.cnf
# add nodes you paln to set in cluster

wsrep_cluster_address="gcomm://
10.0.0.31,10.0.0.51
"
[3] Configure other nodes except a 1st node.
root@node01:~#
vi /etc/mysql/mariadb.conf.d/50-server.cnf
# line 27 : 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"
# specify this host's IP address
wsrep_node_address="10.0.0.51"

root@node01:~#
systemctl restart mariadb

[4] That's OK. Make sute the status like follows. It's OK if [wsrep_local_state_comment] is [Synced].
root@node01:~#
mysql

Welcome to the MariaDB monitor.  Commands end with ; or \g.
Your MariaDB connection id is 40
Server version: 10.6.7-MariaDB-2ubuntu1-log Ubuntu 22.04

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_local_state_uuid        | cad6854c-d285-11ec-8433-ce159bf41641                       |
| wsrep_protocol_version        | 10                                                         |
| wsrep_last_committed          | 2                                                          |
| wsrep_replicated              | 0                                                          |
| wsrep_replicated_bytes        | 0                                                          |
| wsrep_repl_keys               | 0                                                          |
| wsrep_repl_keys_bytes         | 0                                                          |
| wsrep_repl_data_bytes         | 0                                                          |
| wsrep_repl_other_bytes        | 0                                                          |
| wsrep_received                | 3                                                          |
| wsrep_received_bytes          | 216                                                        |
| wsrep_local_commits           | 0                                                          |
| wsrep_local_cert_failures     | 0                                                          |
| wsrep_local_replays           | 0                                                          |
| wsrep_local_send_queue        | 0                                                          |
| wsrep_local_send_queue_max    | 1                                                          |
| wsrep_local_send_queue_min    | 0                                                          |
| wsrep_local_send_queue_avg    | 0                                                          |
| wsrep_local_recv_queue        | 0                                                          |
| wsrep_local_recv_queue_max    | 1                                                          |
| wsrep_local_recv_queue_min    | 0                                                          |
| wsrep_local_recv_queue_avg    | 0                                                          |
| wsrep_local_cached_downto     | 2                                                          |
| wsrep_flow_control_paused_ns  | 0                                                          |
| wsrep_flow_control_paused     | 0                                                          |
| wsrep_flow_control_sent       | 0                                                          |
| wsrep_flow_control_recv       | 0                                                          |
| wsrep_flow_control_active     | false                                                      |
| wsrep_flow_control_requested  | false                                                      |
| wsrep_cert_deps_distance      | 0                                                          |
| wsrep_apply_oooe              | 0                                                          |
| wsrep_apply_oool              | 0                                                          |
| wsrep_apply_window            | 0                                                          |
| wsrep_apply_waits             | 0                                                          |
| wsrep_commit_oooe             | 0                                                          |
| wsrep_commit_oool             | 0                                                          |
| wsrep_commit_window           | 0                                                          |
| wsrep_local_state             | 4                                                          |
| wsrep_local_state_comment     | Synced                                                     |
| wsrep_cert_index_size         | 0                                                          |
| wsrep_causal_reads            | 0                                                          |
| wsrep_cert_interval           | 0                                                          |
| wsrep_open_transactions       | 0                                                          |
| wsrep_open_connections        | 0                                                          |
| wsrep_incoming_addresses      | AUTO,AUTO                                                  |
| wsrep_cluster_weight          | 2                                                          |
| wsrep_desync_count            | 0                                                          |
| wsrep_evs_delayed             |                                                            |
| wsrep_evs_evict_list          |                                                            |
| wsrep_evs_repl_latency        | 0.000217817/0.000324371/0.000481639/0.000100878/7          |
| wsrep_evs_state               | OPERATIONAL                                                |
| wsrep_gcomm_uuid              | 04929cfe-d286-11ec-a09d-2efcde5bff82                       |
| wsrep_gmcast_segment          | 0                                                          |
| wsrep_applier_thread_count    | 1                                                          |
| wsrep_cluster_capabilities    |                                                            |
| wsrep_cluster_conf_id         | 2                                                          |
| wsrep_cluster_size            | 2                                                          |
| wsrep_cluster_state_uuid      | cad6854c-d285-11ec-8433-ce159bf41641                       |
| wsrep_cluster_status          | Primary                                                    |
| wsrep_connected               | ON                                                         |
| wsrep_local_bf_aborts         | 0                                                          |
| wsrep_local_index             | 0                                                          |
| wsrep_provider_capabilities   | :MULTI_MASTER:CERTIFICATION:PARALLEL_APPLYING:TRX_REP..... |
| wsrep_provider_name           | Galera                                                     |
| wsrep_provider_vendor         | Codership Oy <info@codership.com>                          |
| wsrep_provider_version        | 4.9(rcece3ba2)                                             |
| wsrep_ready                   | ON                                                         |
| wsrep_rollbacker_thread_count | 1                                                          |
| wsrep_thread_count            | 2                                                          |
+-------------------------------+------------------------------------------------------------+
69 rows in set (0.001 sec)
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