MariaDB Galera Cluster 환경 구축

sudo apt-get install software-properties-common

sudo apt-key adv --recv-keys --keyserver hkp://keyserver.ubuntu.com:80 0xF1656F24C74CD1D8

sudo add-apt-repository "deb [arch=amd64,arm64,ppc64el] http://mariadb.mirror.liquidtelecom.com/repo/10.4/ubuntu $(lsb_release -cs) main"

sudo apt update
sudo apt -y install mariadb-server mariadb-client

$ sudo mysql_secure_installation

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
haven't set the root password yet, you should just press enter here.

Enter current password for root (enter for none):
OK, successfully used password, moving on...

Setting the root password or using the unix_socket ensures that nobody
can log into the MariaDB root user without the proper authorisation.

You already have your root account protected, so you can safely answer 'n'.

Switch to unix_socket authentication [Y/n] y
Enabled successfully!
Reloading privilege tables..
 ... Success!


You already have your root account protected, so you can safely answer 'n'.

Change the root password? [Y/n] n
 ... skipping.

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? [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? [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 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 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!

sudo mysql

sudo apt-get install mariadb-backup

systemctl stop mysql
rsync -av /var/lib/mysql /data/

# vi /etc/mysql/my.cnf
[mysqld]
datadir=/data/mysql

# vi /etc/mysql/my.cnf

[client]
default-character-set = utf8mb4

[mysql]
default-character-set = utf8mb4

[mysqld]
character-set-client-handshake = FALSE
character-set-server = utf8mb4
collation-server = utf8mb4_unicode_ci

create user 'replication'@'node_ip' identified by 'password' ;
grant all privileges on *.* to replication@node_ip;
flush all privileges;

# vi /etc/mysql/my.cnf

[galera]
# Mandatory settings
wsrep_on=ON
wsrep_provider=/usr/lib/galera/libgalera_smm.so #libgalera_smm.so의 위치 
wsrep_cluster_address="gcomm://192.168.0.1,192.168.0.2,192.168.0.3"
binlog_format=row
default_storage_engine=InnoDB
innodb_autoinc_lock_mode=2
wsrep_cluster_name='mariadb-cluster'      #클러스터명
wsrep_node_address='192.168.0.1'          #해당 노드 ip
wsrep_node_name='DEVBOX02'                #해당 노드 호스트네임
wsrep_sst_method=mariabackup              #동기화 방식. 10.4 이후라서 mariabackup 선택 
wsrep_sst_auth=replication:password       #상단에 설정한 갈레라 연동 계정
wsrep_sst_receive_address=192.168.0.1     #해당 노드 ip
wsrep_provider_options="gcache.recover=yes" 
#갈레라 클러스터중 노드가 종료되었을때 깨진 클러스터를 재구성하지 않고 DB를 되살리기 위한 옵션

# vi /etc/mysql/my.cnf
[mysqld]
transaction-isolation           = READ-COMMITTED

galera_new_cluster

systemctl start mysqld

# mysql 진입후 
SHOW STATUS LIKE 'wsrep%';