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MySQL master-slave replication setup

Tested with MySQL 5.7.22.


On master host, create directory for storing MySQL binary log:

mkdir -pv /var/lib/mysql_bin_log

chown mysql:mysql /var/lib/mysql_bin_log


On master host, edit master MySQL server's config to enable binary log:

server_id=1
log_bin=/var/lib/mysql_bin_log/bin_log
log_bin_index=/var/lib/mysql_bin_log/bin_log.index
binlog_format=row
max_binlog_size=100M
gtid_mode=on
enforce-gtid-consistency=on
log-slave-updates=1
expire_logs_days=10


On master host, restart master MySQL server:

systemctl restart mysqld


On master host, verify binary log files have been created:

ls -l /var/lib/mysql_bin_log


Log in to master MySQL server, create user for replication:

CREATE USER 'dbsync'@'%' IDENTIFIED BY '_DBSYNC_PASSWORD_';

GRANT REPLICATION SLAVE ON *.* TO 'dbsync'@'%';


On slave host, edit slave MySQL server's config file to disable binary log by commenting out the following lines:

#server_id=2
#log_bin=/var/lib/mysql_bin_log/bin_log
#log_bin_index=/var/lib/mysql_bin_log/bin_log.index
#binlog_format=row
#max_binlog_size=100M
#gtid_mode=on
#enforce-gtid-consistency=on
#log-slave-updates=1
#expire_logs_days=10

This aims to not generate binary log during loading dump data from master MySQL server.


On slave host, restart slave MySQL server:

systemctl restart mysqld


On slave host, dump data from master MySQL server:

mysqldump -h _MASTER_DB_HOST_ -P _MASTER_DB_PORT_ -u _MASTER_DB_USERNAME_ -p --default-character-set=utf8mb4 --single-transaction --quick --hex-blob --extended-insert=true --max_allowed_packet=10M --set-gtid-purged=ON > mysqldump_data.sql 2> mysqldump_log.txt

The program will prompt for password.


Log in to slave MySQL server, clear binary log:

RESET MASTER

This will clear global variable GTID_PURGED so that the statement in mysqldump_data.sql that sets GTID_PURGED will not fail.


On slave host, load data into slave MySQL server:

(echo "SET autocommit = 0;"; cat mysqldump_data.sql; echo "COMMIT;" ) | mysql -h _SLAVE_DB_HOST_ -P _SLAVE_DB_PORT_ -u _SLAVE_DB_USERNAME_ -p > mysql_log.txt 2>&1

The program will prompt for password.


On slave host, create directory for storing MySQL binary log:

mkdir -pv /var/lib/mysql_bin_log

chown mysql:mysql /var/lib/mysql_bin_log


On slave host, edit slave MySQL server's config to enable binary log:

server_id=2
log_bin=/var/lib/mysql_bin_log/bin_log
log_bin_index=/var/lib/mysql_bin_log/bin_log.index
binlog_format=row
max_binlog_size=100M
gtid_mode=on
enforce-gtid-consistency=on
log-slave-updates=1
expire_logs_days=10


On slave host, restart slave MySQL server:

systemctl restart mysqld


On slave host, verify binary log files have been created:

ls -l /var/lib/mysql_bin_log


On slave host, find the GTID_PURGED value in mysqldump_data.sql:

head -n 50 mysqldump_data.sql | grep GTID_PURGED


Log in to slave MySQL server, find the value of global variable GTID_PURGED:

SELECT @@GLOBAL.GTID_PURGED

Verify the value matches with that in mysqldump_data.sql.


Log in to slave MySQL server, enable replication:

CHANGE MASTER TO MASTER_HOST="_MASTER_DB_HOST_", MASTER_PORT="_MASTER_DB_PORT_", MASTER_USER="dbsync", MASTER_PASSWORD="_DBSYNC_PASSWORD_", MASTER_AUTO_POSITION = 1;

START SLAVE;


Check replication status:

SHOW SLAVE STATUS;
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