MariaDB Galera Cluster

MariaDB Galera Cluster 2015/07/26

	Configure MariaDB Galera Cluster. All nodes in cluster become Master-Server in this configuration.
[1]	Install MariaDB Galera packages on all nodes like follows.

[root@www ~]#  vi /etc/yum.repos.d/mariadb.repo # MariaDB 10.0 CentOS repository list # http://mariadb.org/mariadb/repositories/ [mariadb] name = MariaDB baseurl = http://yum.mariadb.org/10.0/centos7-amd64 gpgkey=https://yum.mariadb.org/RPM-GPG-KEY-MariaDB gpgcheck=1 enabled=0 [root@www ~]#  yum --enablerepo=mariadb -y install MariaDB-Galera-server

[2]	Configure a 1st node like follows.

[root@www ~]#  vi /etc/my.cnf.d/server.cnf # line 19: uncomment and change like follows [galera] # Mandatory settings wsrep_provider= /usr/lib64/galera/libgalera_smm.so  # specify all nodes in cluster wsrep_cluster_address= "gcomm://10.0.0.31,10.0.0.51" # uncomment all binlog_format=row default_storage_engine=InnoDB innodb_autoinc_lock_mode=2 bind-address=0.0.0.0 # add follows # cluster name wsrep_cluster_name="MariaDB_Cluster" # own IP address wsrep_node_address="10.0.0.31" # replication provider wsrep_sst_method=rsync [root@www ~]#  /etc/rc.d/init.d/mysql bootstrap  Bootstrapping the cluster.. Starting MySQL.. SUCCESS! # configure basic settings [root@www ~]#  mysql_secure_installation

[3]	Configure other nodes except a node of previous section like follows.

[root@node01 ~]#  vi /etc/my.cnf.d/server.cnf # line 19: uncomment and change like follows [galera] # Mandatory settings wsrep_provider= /usr/lib64/galera/libgalera_smm.so  # specify all nodes in cluster wsrep_cluster_address= "gcomm://10.0.0.31,10.0.0.51" # uncomment all binlog_format=row default_storage_engine=InnoDB innodb_autoinc_lock_mode=2 bind-address=0.0.0.0 # add follows # cluster name wsrep_cluster_name="MariaDB_Cluster" # own IP address wsrep_node_address="10.0.0.51" # replication provider wsrep_sst_method=rsync [root@node01 ~]#  systemctl start mysql

[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 6 Server version: 10.0.20-MariaDB-wsrep MariaDB Server, wsrep_25.10.r4144 Copyright (c) 2000, 2015, 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 | 20329169-3414-11e5-9285-cab5ed757f81 | | wsrep_protocol_version | 7 | | wsrep_last_committed | 3 | | 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 | 237 | | wsrep_local_commits | 0 | | wsrep_local_cert_failures | 0 | | wsrep_local_replays | 0 | | wsrep_local_send_queue | 0 | | wsrep_local_send_queue_max | 2 | | wsrep_local_send_queue_min | 0 | | wsrep_local_send_queue_avg | 0.333333 | | wsrep_local_recv_queue | 0 | | wsrep_local_recv_queue_max | 1 | | wsrep_local_recv_queue_min | 0 | | wsrep_local_recv_queue_avg | 0.000000 | | wsrep_local_cached_downto | 18446744073709551615 | | wsrep_flow_control_paused_ns | 0 | | wsrep_flow_control_paused | 0.000000 | | wsrep_flow_control_sent | 0 | | wsrep_flow_control_recv | 0 | | wsrep_cert_deps_distance | 0.000000 | | wsrep_apply_oooe | 0.000000 | | wsrep_apply_oool | 0.000000 | | wsrep_apply_window | 0.000000 | | wsrep_commit_oooe | 0.000000 | | wsrep_commit_oool | 0.000000 | | wsrep_commit_window | 0.000000 | | wsrep_local_state | 4 | | wsrep_local_state_comment | Synced | | wsrep_cert_index_size | 0 | | wsrep_causal_reads | 0 | | wsrep_cert_interval | 0.000000 | | wsrep_incoming_addresses | 10.0.0.31:3306,10.0.0.51:3306 | | wsrep_evs_delayed | | | wsrep_evs_evict_list | | | wsrep_evs_repl_latency | 0/0/0/0/0 | | wsrep_evs_state | OPERATIONAL | | wsrep_gcomm_uuid | 69d7b95d-3415-11e5-9666-7be9d4b6159d | | wsrep_cluster_conf_id | 2 | | wsrep_cluster_size | 2 | | wsrep_cluster_state_uuid | 20329169-3414-11e5-9285-cab5ed757f81 | | wsrep_cluster_status | Primary | | wsrep_connected | ON | | wsrep_local_bf_aborts | 0 | | wsrep_local_index | 1 | | wsrep_provider_name | Galera | | wsrep_provider_vendor | Codership Oy <info@codership.com> | | wsrep_provider_version | 25.3.9(r3387) | | wsrep_ready | ON | | wsrep_thread_count | 2 | +------------------------------+--------------------------------------+ 57 rows in set (0.00 sec)

MariaDB Replication

MariaDB Replication 2015/03/23

	Configure MariaDB Replication settings. This configuration is general Master-Slave settings.
[1]	Change settings and create a user for replication on MariaDB Matser Host.

[root@www ~]#  vi /etc/my.cnf [mysqld] # add follows in [mysqld] section : get binary logs log-bin=mysql-bin # define server ID server-id=101 [root@www ~]#  systemctl restart mariadb  [root@www ~]#  mysql -u root -p  Enter password: Welcome to the MariaDB monitor. Commands end with ; or \g. Your MariaDB connection id is 2 Server version: 5.5.41-MariaDB-log MariaDB Server Copyright (c) 2000, 2014, Oracle, MariaDB Corporation Ab and others. Type 'help;' or '\h' for help. Type '\c' to clear the current input statement. # create user (set any password for 'password' section) MariaDB [(none)]>  grant replication slave on *.* to replica@'%' identified by 'password';  Query OK, 0 rows affected (0.00 sec) MariaDB [(none)]>  flush privileges;  Query OK, 0 rows affected (0.00 sec) MariaDB [(none)]>  exit Bye

[2]	Install and start MariaDB Server on Slave Host, refer to here.
[3]	Change settings on Slave Host.

[root@repl01 ~]#  vi /etc/my.cnf [mysqld] # add follows in [mysqld] section : get binary logs log-bin=mysql-bin # define server ID (different one from Master Host) server-id=102 # read only read_only=1 # define own hostname report-host=repl01.server.world [root@repl01 ~]#  systemctl restart mariadb

[4]	Get Dump-Data on Master Host.

[root@www ~]#  mysql -u root -p  Enter password: Your MariaDB connection id is 3 Server version: 5.5.41-MariaDB-log MariaDB Server Copyright (c) 2000, 2014, Oracle, MariaDB Corporation Ab and others. Type 'help;' or '\h' for help. Type '\c' to clear the current input statement. # lock all tables MariaDB [(none)]>  flush tables with read lock;  Query OK, 0 rows affected (0.00 sec) # show status (remember File, Position value) MariaDB [(none)]>  show master status;  +------------------+----------+--------------+------------------+ | File | Position | Binlog_Do_DB | Binlog_Ignore_DB | +------------------+----------+--------------+------------------+ | mysql-bin.000001 | 465 | | | +------------------+----------+--------------+------------------+ 1 row in set (0.00 sec) # remain the window above and open the another window and execute dump [root@www ~]#  mysqldump -u root -p --all-databases --lock-all-tables --events > mysql_dump.sql  Enter password: # back to the remained window and unlock MariaDB [(none)]>  unlock tables;  Query OK, 0 rows affected (0.00 sec) MariaDB [(none)]>  exit Bye # transfer the dump to Slave Host [root@www ~]#  scp mysql_dump.sql repl01.server.world:/tmp/  root@repl01.server.world's password: mysql_dump.sql 100% 515KB 514.7KB/s 00:00

[5]	Configure replication settings on Slave Host. It's OK all, make sure the settings work normally to create databases on Master Host.

# import dump from Master Host [root@repl01 ~]#  mysql -u root -p < /tmp/mysql_dump.sql  Enter password: [root@repl01 ~]#  mysql -u root -p  Enter password: Welcome to the MariaDB monitor. Commands end with ; or \g. Your MariaDB connection id is 3 Server version: 5.5.41-MariaDB-log MariaDB Server Copyright (c) 2000, 2014, Oracle, MariaDB Corporation Ab and others. Type 'help;' or '\h' for help. Type '\c' to clear the current input statement. MariaDB [(none)]>  change master to      ->  master_host='10.0.0.31',     # Master Hosts's IP     ->  master_user='replica',     # replication ID     ->  master_password='password',     # replication ID's password     ->  master_log_file='mysql-bin.000001',     # File value confirmed on Master     ->  master_log_pos=465;     # Position value confirmed on Master Query OK, 0 rows affected (0.58 sec) # start replication MariaDB [(none)]>  start slave; Query OK, 0 rows affected (0.00 sec) # show status MariaDB [(none)]>  show slave status\G *************************** 1. row *************************** Slave_IO_State: Waiting for master to send event Master_Host: 10.0.0.31 Master_User: replica Master_Port: 3306 Connect_Retry: 60 Master_Log_File: mysql-bin.000001 Read_Master_Log_Pos: 536 Relay_Log_File: mariadb-relay-bin.000002 Relay_Log_Pos: 600 Relay_Master_Log_File: mysql-bin.000001 Slave_IO_Running: Yes Slave_SQL_Running: Yes Replicate_Do_DB: Replicate_Ignore_DB: Replicate_Do_Table: Replicate_Ignore_Table: Replicate_Wild_Do_Table: Replicate_Wild_Ignore_Table: Last_Errno: 0 Last_Error: Skip_Counter: 0 Exec_Master_Log_Pos: 536 Relay_Log_Space: 896 Until_Condition: None Until_Log_File: Until_Log_Pos: 0 Master_SSL_Allowed: No Master_SSL_CA_File: Master_SSL_CA_Path: Master_SSL_Cert: Master_SSL_Cipher: Master_SSL_Key: Seconds_Behind_Master: 0 Master_SSL_Verify_Server_Cert: No Last_IO_Errno: 0 Last_IO_Error: Last_SQL_Errno: 0 Last_SQL_Error: Replicate_Ignore_Server_Ids: Master_Server_Id: 101 1 row in set (0.00 sec)

Install phpMyAdmin

Install phpMyAdmin 2014/08/29

	Install phpMyAdmin to operate MariaDB on web browser from Clients.
[1]	Install and start Apache httpd, refer to here.
[2]	Install PHP, refer to here.
[3]	Install phpMyAdmin.

# install from EPEL [root@www ~]#  yum --enablerepo=epel -y install phpMyAdmin php-mysql php-mcrypt [root@www ~]#  vi/etc/httpd/conf.d/phpMyAdmin.conf # line 15: IP address you permit to access Require ip 127.0.0.1  10.0.0.0/24 # line 32: IP address you permit to access Require ip 127.0.0.1  10.0.0.0/24 [root@www ~]#  systemctl restart httpd

[4]	Access to 'http://(your hostname or IP address)/(alias name you set)/' with web browser from Clients, then Login with a user in MariaDB on following screen. This example uses root user to proceed.

[5]	Just logined. You can operate MariaDB on here.

[6]	It's possible to change settings of MariaDB on "http://(your hostname or IP address)/phpmyadmin/setup".

Install MariaDB

Install MariaDB 2014/07/27

	Install MariaDB to configure Database Server.
[1]	Install and start MariaDB.

[root@www ~]#  yum -y install mariadb-server [root@www ~]#  vi /etc/my.cnf # add follows within [mysqld] section [mysqld] character-set-server=utf8 [root@www ~]#  systemctl start mariadb  [root@www ~]#  systemctl enable mariadb  ln -s '/usr/lib/systemd/system/mariadb.service' '/etc/systemd/system/multi-user.target.wants/mariadb.service'

[2]	Initial Settings for MariaDB.

[root@www ~]#  mysql_secure_installation  /usr/bin/mysql_secure_installation: line 379: find_mysql_client: command not found NOTE: RUNNING ALL PARTS OF THIS SCRIPT IS RECOMMENDED FOR ALL MariaDB SERVERS IN PRODUCTION USE! PLEASE READ EACH STEP CAREFULLY! In order to log into MariaDB to secure it, we'll need the current password for the root user. If you've just installed MariaDB, and you haven't set the root password yet, the password will be blank, so you should just press enter here. Enter current password for root (enter for none): OK, successfully used password, moving on... Setting the root password ensures that nobody can log into the MariaDB root user without the proper authorisation. # set root password Set root password? [Y/n]  y New password: Re-enter new password: Password updated successfully! Reloading privilege tables.. ... Success! By default, a MariaDB installation has an anonymous user, allowing anyone to log into MariaDB without having to have a user account created for them. This is intended only for testing, and to make the installation go a bit smoother. You should remove them before moving into a production environment. # remove anonymous users Remove anonymous users? [Y/n]  y ... Success! Normally, root should only be allowed to connect from 'localhost'. This ensures that someone cannot guess at the root password from the network. # disallow root login remotely Disallow root login remotely? [Y/n]  y ... Success! By default, MariaDB comes with a database named 'test' that anyone can access. This is also intended only for testing, and should be removed before moving into a production environment. # remove test database Remove test database and access to it? [Y/n]  y - Dropping test database... ... Success! - Removing privileges on test database... ... Success! Reloading the privilege tables will ensure that all changes made so far will take effect immediately. # reload privilege tables Reload privilege tables now? [Y/n]  y ... Success! Cleaning up... All done! If you've completed all of the above steps, your MariaDB installation should now be secure. Thanks for using MariaDB! [root@www ~]#  mysql -u root -p  # connect to MariaDB with root Enter password: # password you set Welcome to the MariaDB monitor. Commands end with ; or \g. Your MariaDB connection id is 3 Server version: 5.5.37-MariaDB MariaDB Server Copyright (c) 2000, 2014, Oracle, Monty Program Ab and others. Type 'help;' or '\h' for help. Type '\c' to clear the current input statement. # show user list MariaDB [(none)]>  select user,host,password from mysql.user;  +------+-----------+-------------------------------------------+ | user | host | password | +------+-----------+-------------------------------------------+ | root | localhost | *xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx | | root | 127.0.0.1 | *xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx | | root | ::1 | *xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx | +------+-----------+-------------------------------------------+ 3 rows in set (0.00 sec) # show database list MariaDB [(none)]>  show databases;  +--------------------+ | Database | +--------------------+ | information_schema | | mysql | | performance_schema | +--------------------+ 3 rows in set (0.00 sec) MariaDB [(none)]>  exit Bye