设:主库为master,从库为slave
1.备份主库数据(全库)，且记录下 master_log_file,master_log_pos，用于后面设置slave时指定
备份脚本: mysqldump --socket=/home/data/mysql/mysql.sock --single-transaction --master-data=2 -uroot -proot --all-databases > dbdump.sql
2.将主库备份的数据在从库中恢复
登录slave mysql 然后source /home/bak/dbdump.sql
3.主库中创建用于主从复制的用户
执行脚本：grant replication slave,replication client on *.* to rep_user@'slave' identified by 'user_rep';
3.配置slave，登录 slave mysql 执行
change master to master_host='master',master_user='rep_user',master_password='user_rep',master_port=3306,master_log_file='mysql-bin.000749',master_log_pos=18616572,master_connect_retry=30;
附配置文件：
master
# For advice on how to change settings please see
# http://dev.mysql.com/doc/refman/5.6/en/server-configuration-defaults.html
[mysql]
port = 3306
socket = /home/data/mysql/mysql.sock
default-character-set = utf8
[mysqld]
# Remove leading # and set to the amount of RAM for the most important data
# cache in MySQL. Start at 70% of total RAM for dedicated server, else 10%.
# innodb_buffer_pool_size = 128M
# Remove leading # to turn on a very important data integrity option: logging
# changes to the binary log between backups.
log_bin = /home/data/biglog/mysql-bin
binlog_format = 'MIXED'
binlog-ignore-db=information_schema
expire_logs_days = 14
relay_log = /home/data/relaylog/mysql-relay-bin
server-id = 15
#GTID
gtid_mode = on
enforce_gtid_consistency = 1
log_slave_updates = 1
#slow log
slow-query-log = on # 开启慢查询功能
slow_query_log_file = /home/data/slowlog/slow-query.log # 慢查询日志存放路径与名称
long_query_time = 10 # 查询时间超过1s的查询语句
# These are commonly set, remove the # and set as required.
# basedir = .....
# datadir = .....
socket = /home/data/mysql/mysql.sock
datadir = /home/data/mysql
log_error = /var/log/mysql/error.log
character_set_server = utf8
character_set_client = utf8
collation_server = utf8_general_ci
max_connections = 1000
lower_case_table_names=1
# Remove leading # to set options mainly useful for reporting servers.
# The server defaults are faster for transactions and fast SELECTs.
# Adjust sizes as needed, experiment to find the optimal values.
# join_buffer_size = 128M
# sort_buffer_size = 2M
# read_rnd_buffer_size = 2M
sql_mode=NO_ENGINE_SUBSTITUTION,STRICT_TRANS_TABLES
slave:
# For advice on how to change settings please see
# http://dev.mysql.com/doc/refman/5.6/en/server-configuration-defaults.html
# *** DO NOT EDIT THIS FILE. It's a template which will be copied to the
# *** default location during install, and will be replaced if you
# *** upgrade to a newer version of MySQL.
[client]
port = 3306
#default-character-set = utf8
[mysqld]
#innodb_force_recovery = 3
# Remove leading # and set to the amount of RAM for the most important data
# cache in MySQL. Start at 70% of total RAM for dedicated server, else 10%.
# innodb_buffer_pool_size = 128M
# Remove leading # to turn on a very important data integrity option: logging
# changes to the binary log between backups.
# log_bin
#innodb_force_recovery=1
log_bin = /home/data/binlog/mysql-bin
binlog_format = 'MIXED'
expire_logs_days = 14
relay_log = /home/data/relaylog/mysql-relay-bin
slave_skip_errors = 1062
read_only = 1
#GTID
gtid_mode = on
enforce_gtid_consistency = 1
log_slave_updates = 1
#slow log
slow-query-log = on # 开启慢查询功能
slow_query_log_file = /home/data/slowlog/slow-query.log # 慢查询日志存放路径与名称
long_query_time = 8 # 查询时间超过1s的查询语句
# These are commonly set, remove the # and set as required.
#basedir =
datadir = /home/data/mysql/
port = 3306
server_id = 4
# server_id = .....
socket = /home/data/mysql/mysql.sock
log_error = /var/log/mysql/error.log
character_set_server = utf8
character_set_client = utf8
collation_server = utf8_general_ci
max_connections = 1000
lower_case_table_names=1
# Remove leading # to set options mainly useful for reporting servers.
# The server defaults are faster for transactions and fast SELECTs.
# Adjust sizes as needed, experiment to find the optimal values.
# join_buffer_size = 128M
# sort_buffer_size = 2M
# read_rnd_buffer_size = 2M
sql_mode=NO_ENGINE_SUBSTITUTION,STRICT_TRANS_TABLES
[mysql]
default-character-set = utf8
socket = /home/data/mysql/mysql.sock