Note: make sure you backup your data bafore doing following steps.
##Stop mysql and check
sudo service mysqld stop
sudo ps aux | grep mysql
##Remove or rename existing db folder and files.
sudo mv /vol/data/mysql /vol/data/mysql__old
sudo mv /etc/my.cnf /etc/my.old__cnf
sudo mv /etc/my.cnf.d /etc/my.cnf.d__old
##Remove or rename existing db folder and files.
sudo mv /var/lib/mysql /var/lib/mysql__old
sudo mv /etc/my.cnf /etc/my.old__cnf
sudo mv /etc/my.cnf.d /etc/my.cnf.d__old
sudo yum remove MariaDB-client MariaDB-common MariaDB-compat MariaDB-connect-engine MariaDB-server galera-4
sudo yum -y install MariaDB-server MariaDB-client MariaDB-connect-engine
ll /etc/my.cnf
ll /etc/my.cnf.d/galera.cnf
sudo systemctl start mariadb ; sudo systemctl enable mariadb
sudo mysql -uroot
set password = password("WelComE.01!");
CREATE USER 'cluster-user'@'%' IDENTIFIED BY 'clusterpass';
GRANT ALL PRIVILEGES ON . TO 'cluster-user'@'%' IDENTIFIED BY 'clusterpass' WITH GRANT OPTION;
CREATE USER 'clustercheck'@'localhost' IDENTIFIED BY 'clustercheck';
GRANT PROCESS ON . TO 'clustercheck'@'localhost' IDENTIFIED BY 'clustercheck';
SET session auto_increment_increment = 1;
SET global auto_increment_increment = 1;
SET session auto_increment_offset = 1;
SET global auto_increment_offset = 1;
quit;
sudo yum -y install rsync policycoreutils-python
Step 3 — Configuring the First Node
sudo vi /etc/my.cnf.d/galera.cnf
[mysqld]
binlog_format=ROW
default-storage-engine=innodb
innodb_autoinc_lock_mode=2
bind-address=0.0.0.0
# Galera Provider Configuration
wsrep_on=ON
wsrep_provider=/usr/lib64/galera-4/libgalera_smm.so
# Galera Cluster Configuration
wsrep_cluster_name="web_cluster"
wsrep_cluster_address="gcomm://172.16.1.173,172.17.1.173,172.18.1.173"
# Galera Synchronization Configuration
wsrep_sst_method=rsync
wsrep_sst_auth=cluster-user:clusterpass
# Galera Node Configuration
wsrep_node_address="172.16.1.173"
wsrep_node_name="web-db-01"
sudo service firewalld stop
sudo systemctl stop mariadb
#On the first node, bootstrap the cluster by executing
sudo galera_new_cluster
sudo ps aux | grep mysql
#start serverss one by one 2nd and 3rd
sudo systemctl start mariadb
#check status
sudo systemctl status mariadb
Stop all 3
sudo systemctl stop mariadb
sudo rm -rf /vol/data/mysql
sudo mv /var/lib/mysql /vol/data/
sudo mkdir -p 700 /vol/data/mysql/mysqltmp
sudo chown -R mysql:mysql /vol/data/mysql/mysqltmp
sudo vi /etc/my.cnf
#
# This group is read both both by the client and the server
# use it for options that affect everything
#
[client-server]
socket=/vol/data/mysql/mysql.sock
#
# include all files from the config directory
#
!includedir /etc/my.cnf.d
[mysqld]
datadir=/vol/data/mysql
socket=/vol/data/mysql/mysql.sock
# 80% RAM innodb_buffer_pool_size 52G = 55834574848
innodb_buffer_pool_size=55834574848
#innodb_flush_method=normal
#sort_buffer_size=8000M
#join_buffer_size = 3000M
#read_rnd_buffer_size=3000M
#1G= 1073741824 500M = 524288000 50M= 52428800
sort_buffer_size=52428800
join_buffer_size=52428800
read_rnd_buffer_size=52428800
max_sort_length=8388608
max_length_for_sort_data=1048
# 1.5G = 1610612736 500M = 524288000
innodb_lock_wait_timeout=90
query_cache_type=1
query_cache_size=52428800
query_cache_limit=52428800
thread_cache_size=90
max_connections=500
#9G = 9663676416
max_heap_table_size=9663676416
tmp_table_size=9663676416
max_allowed_packet=52428800
table_open_cache=300
#Support Large Txn
#innodb_log_buffer_size=9663676416
#Log
log_output=FILE
log_warnings=2
log_error=mariadb.err
slow_query_log
slow_query_log = 1
slow_query_log_file = mariadb-slow.log
long_query_time=600
log_queries_not_using_indexes=0
tmpdir=/vol/data/mysql/mysqltmp
character-set-server=utf8
collation-server=utf8_unicode_ci
skip-character-set-client-handshake
#character-set-connection=utf8
innodb_buffer_pool_instances=4
innodb_page_cleaners=4
group_concat_max_len=1048576
# 2GB for last txn
#wsrep_max_ws_size=2147483647
#binlog_row_image='MINIMAL'
auto_increment_increment = 1
# GALERA saved state
version: 2.1
uuid: 1422a148-0f6c-11ea-bdad-5b132c2a2ccc
seqno: 6
safe_to_bootstrap: 1
[neon@neon-web-db-01 ~]$
[neon@neon-web-db-02 ~]$ sudo cat /vol/data/mysql/grastate.dat
# GALERA saved state
version: 2.1
uuid: 1422a148-0f6c-11ea-bdad-5b132c2a2ccc
seqno: 4
safe_to_bootstrap: 0
[neon@neon-web-db-02 ~]$
[neon@neon-web-db-03 ~]$ sudo cat /vol/data/mysql/grastate.dat
# GALERA saved state
version: 2.1
uuid: 1422a148-0f6c-11ea-bdad-5b132c2a2ccc
seqno: 5
safe_to_bootstrap: 0
[neon@neon-web-db-03 ~]$
sudo galera_new_cluster
##start 2 server
sudo systemctl start mariadb
sudo systemctl start mariadb
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