MariaDB : MariaDB Galera Cluster2020/11/11 |
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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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[root@www ~]#
dnf -y install mariadb-server-galera # if Firewalld is running, allow related 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/my.cnf.d/galera.cnf # line 34: change wsrep_on=" ON "
# 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 "
[root@www ~]#
vi /etc/my.cnf.d/galera.cnf # line 46: add all nodes in cluster you plan to add wsrep_cluster_address="gcomm:// 10.0.0.31,10.0.0.51 "
# 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/my.cnf.d/galera.cnf # line 34: change wsrep_on=" ON "
# 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 mariadb |
| [4] | If SELinux is enabled, change policy. |
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[root@www ~]#
vi my-galera.te # create new
module my-galera 1.0;
require {
type firewalld_t;
type mysqld_t;
type sysctl_net_t;
type httpd_config_t;
type pcscd_t;
class lnk_file read dir search;
class capability sys_nice;
}
#============= firewalld_t ==============
allow firewalld_t self:capability sys_nice;
#============= pcscd_t ==============
allow pcscd_t self:capability sys_nice;
#============= mysqld_t ==============
allow mysqld_t sysctl_net_t:dir search;
allow mysqld_t httpd_config_t:lnk_file read;
checkmodule -m -M -o my-galera.mod my-galera.te [root@www ~]# semodule_package --outfile my-galera.pp --module my-galera.mod [root@www ~]# semodule -i my-galera.pp |
| [5] | 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 Welcome to the MariaDB monitor. Commands end with ; or \g. Your MariaDB connection id is 13 Server version: 10.4.16-MariaDB 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_local_state_uuid | b9accebd-23bb-11eb-88e2-daa681dc7bfd | | wsrep_protocol_version | 10 | | wsrep_last_committed | 7 | | 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 | 1 | | wsrep_apply_oooe | 0 | | wsrep_apply_oool | 0 | | wsrep_apply_window | 1 | | wsrep_commit_oooe | 0 | | wsrep_commit_oool | 0 | | wsrep_commit_window | 1 | | wsrep_local_state | 4 | | wsrep_local_state_comment | Synced | | wsrep_cert_index_size | 2 | | wsrep_causal_reads | 0 | | wsrep_cert_interval | 3 | | 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 | 0/0/0/0/0 | | wsrep_evs_state | OPERATIONAL | | wsrep_gcomm_uuid | 2ede17c9-23bc-11eb-871c-6260c50b4374 | | wsrep_gmcast_segment | 0 | | wsrep_applier_thread_count | 1 | | wsrep_cluster_capabilities | | | wsrep_cluster_conf_id | 4 | | wsrep_cluster_size | 2 | | wsrep_cluster_state_uuid | b9accebd-23bb-11eb-88e2-daa681dc7bfd | | wsrep_cluster_status | Primary | | wsrep_connected | ON | | wsrep_local_bf_aborts | 0 | | wsrep_local_index | 0 | | wsrep_provider_capabilities | :MULTI_MASTER:CERTIFICATION:PARALLEL_APPLYING:T... | | wsrep_provider_name | Galera | | wsrep_provider_vendor | Codership Oy <info@codership.com> | | wsrep_provider_version | 4.6(rXXXX) | | wsrep_ready | ON | | wsrep_rollbacker_thread_count | 1 | | wsrep_thread_count | 2 | +-------------------------------+----------------------------------------------------+ 68 rows in set (0.002 sec) |
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