MariaDB 10.3 : MariaDB Galera Cluster2020/01/23 |
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Configure MariaDB Galera Cluster.
All nodes in cluster become Master-Server in this configuration. |
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| [1] | Install MariaDB Galera packages on all nodes. |
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# install from SCLo
[root@www ~]#
yum --enablerepo=centos-sclo-rh -y install rh-mariadb103-mariadb-server-galera # if Firewalld is running, allow ports [root@www ~]# firewall-cmd --add-service=mysql --permanent [root@www ~]# firewall-cmd --add-port={3306/tcp,4567/tcp,4568/tcp,4444/tcp} --permanent [root@www ~]# firewall-cmd --reload |
| [2] | Configure 1st node. |
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[root@www ~]#
vi /etc/opt/rh/rh-mariadb103/my.cnf.d/galera.cnf # line 43 : specify any cluster name wsrep_cluster_name=" Galera_Cluster "
# line 46 : uncomment and change like follows wsrep_cluster_address=" gcomm:// "
# line 54 : uncomment and change to own IP address wsrep_node_address=" 10.0.0.31 "
# start Galera Cluster [root@www ~]# galera_new_cluster [root@www ~]# systemctl enable rh-mariadb103-mariadb
# run basic initial settings [root@www ~]# mysql_secure_installation |
| [3] | Configure other nodes except a node of previous section. |
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[root@node01 ~]#
vi /etc/opt/rh/rh-mariadb103/my.cnf.d/galera.cnf # line 43 : specify cluster name that is the same one with 1st node wsrep_cluster_name=" Galera_Cluster "
# line 46 : uncomment and specify all nodes in cluster wsrep_cluster_address=" gcomm://10.0.0.31,10.0.0.51 "
# line 54 : uncomment and change to own IP address wsrep_node_address=" 10.0.0.51 "
systemctl enable --now rh-mariadb103-mariadb |
| [4] | That's OK. Make sute the status like follows. It's OK if [wsrep_local_state_comment] is [Synced]. |
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[root@node01 ~]# mysql -u root -p Enter password: Welcome to the MariaDB monitor. Commands end with ; or \g. Your MariaDB connection id is 12 Server version: 10.3.13-MariaDB-log MariaDB Server 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 | e15a5dee-3d95-11ea-ae29-4795948371fb | | 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 | 0/0/0/0/0 | | 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 | 5988bda8-3d96-11ea-a973-2a2de78893bd | | wsrep_incoming_addresses | 10.0.0.51:3306,10.0.0.31:3306 | | wsrep_last_committed | 3 | | 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 | 0.000000 | | 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 | e15a5dee-3d95-11ea-ae29-4795948371fb | | 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(rXXXX) | | 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 (0.001 sec) |
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