Ubuntu 20.04
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MariaDB : Galera Cluster2020/05/09

 
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:~#
vi /usr/bin/galera_recovery
# line 104: comment out (for bug fix)

if [ -n "$log_file" -a -f "$log_file" ]; then
#
[ "$euid" = "0" ] && chown $user $log_file
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:~#
vi /usr/bin/galera_recovery
# line 104: comment out (for bug)

if [ -n "$log_file" -a -f "$log_file" ]; then
#
[ "$euid" = "0" ] && chown $user $log_file
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 38
Server version: 10.3.22-MariaDB-1ubuntu1 Ubuntu 20.04

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_applier_thread_count    | 1                                                 |
| 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      | f6026c91-91df-11ea-8d69-caf006b3e848              |
| 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        | 0.000267615/0.000402032/0.000660328/0.000126593/7 |
| 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              | 8ded5a4b-91e0-11ea-8d07-8f0d6519739a              |
| wsrep_incoming_addresses      | 10.0.0.51:3306,10.0.0.31:3306                     |
| 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             | 0                                                 |
| wsrep_local_recv_queue        | 0                                                 |
| wsrep_local_recv_queue_avg    | 0.333333                                          |
| wsrep_local_recv_queue_max    | 2                                                 |
| 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        | f6026c91-91df-11ea-8d69-caf006b3e848              |
| 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        | 3.29(ra60e019)                                    |
| 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_rollbacker_thread_count | 1                                                 |
| wsrep_thread_count            | 2                                                 |
+-------------------------------+---------------------------------------------------+
63 rows in set (0.002 sec)
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