[root@test-1 ~]# rm -rf  /var/lib/mysql/auto.cnf
[root@test-1 ~]#

[root@test-1 ~]# cat /etc/my.cnf
# For advice on how to change settings please see
# http://dev.mysql.com/doc/refman/5.7/en/server-configuration-defaults.html

[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
#
# 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
datadir=/var/lib/mysql
socket=/var/lib/mysql/mysql.sock

# Disabling symbolic-links is recommended to prevent assorted security risks
symbolic-links=0

log-error=/var/log/mysqld.log
pid-file=/var/run/mysqld/mysqld.pid

# 主從配置
# 主庫和從庫需要不一致，分別配一個唯一的ID編號
server_id = 1    
# 二進制文件存放路徑,存放在根目錄data文件夾下
log_bin=master-bin    
# 設(shè)置需要同步的數(shù)據(jù)庫
binlog_do_db=db_demo
# 忽略系統(tǒng)庫同步
binlog_ignore_db=mysql
binlog_ignore_db=information_schema
binlog_ignore_db=performance_schema
[root@test-1 ~]# 

[root@test-1 ~]# systemctl restart mysqld
[root@test-1 ~]# 
[root@test-1 ~]# systemctl status mysqld
● mysqld.service - MySQL Server
   Loaded: loaded (/usr/lib/systemd/system/mysqld.service; enabled; vendor preset: disabled)
   Active: active (running) since 二 2025-05-27 16:49:40 CST; 11s ago
     Docs: man:mysqld(8)
           http://dev.mysql.com/doc/refman/en/using-systemd.html
  Process: 3279 ExecStart=/usr/sbin/mysqld --daemonize --pid-file=/var/run/mysqld/mysqld.pid $MYSQLD_OPTS (code=exited, status=0/SUCCESS)
  Process: 3258 ExecStartPre=/usr/bin/mysqld_pre_systemd (code=exited, status=0/SUCCESS)
 Main PID: 3282 (mysqld)
   CGroup: /system.slice/mysqld.service
           └─3282 /usr/sbin/mysqld --daemonize --pid-file=/var/run/mysqld/mysqld.pid

5月 27 16:49:38 test-1 systemd[1]: Starting MySQL Server...
5月 27 16:49:40 test-1 systemd[1]: Started MySQL Server.
[root@test-1 ~]# 

[root@test-2 ~]# rm -rf  /var/lib/mysql/auto.cnf
[root@test-2 ~]#

[root@test-2 ~]# cat /etc/my.cnf
# For advice on how to change settings please see
# http://dev.mysql.com/doc/refman/5.7/en/server-configuration-defaults.html

[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
#
# 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
datadir=/var/lib/mysql
socket=/var/lib/mysql/mysql.sock

# Disabling symbolic-links is recommended to prevent assorted security risks
symbolic-links=0

log-error=/var/log/mysqld.log
pid-file=/var/run/mysqld/mysqld.pid

# 主從配置
server_id=2
# 二進制文件存放路徑,存放在根目錄data文件夾下
log_bin=slave-bin    
# 設(shè)置需要同步的數(shù)據(jù)庫
replicate_wild_do_table=db_demo.%
#屏蔽系統(tǒng)庫同步
replicate_wild_ignore_table=mysql.%
replicate_wild_ignore_table=information_schema.%
replicate_wild_ignore_table=performance_schema.%
[root@test-2 ~]# 

[root@test-2 ~]# systemctl restart mysqld
[root@test-2 ~]# 
[root@test-2 ~]# systemctl status mysqld
● mysqld.service - MySQL Server
   Loaded: loaded (/usr/lib/systemd/system/mysqld.service; enabled; vendor preset: disabled)
   Active: active (running) since 二 2025-05-27 17:00:52 CST; 7s ago
     Docs: man:mysqld(8)
           http://dev.mysql.com/doc/refman/en/using-systemd.html
  Process: 3177 ExecStart=/usr/sbin/mysqld --daemonize --pid-file=/var/run/mysqld/mysqld.pid $MYSQLD_OPTS (code=exited, status=0/SUCCESS)
  Process: 3155 ExecStartPre=/usr/bin/mysqld_pre_systemd (code=exited, status=0/SUCCESS)
 Main PID: 3180 (mysqld)
   CGroup: /system.slice/mysqld.service
           └─3180 /usr/sbin/mysqld --daemonize --pid-file=/var/run/mysqld/mysqld.pid

5月 27 17:00:49 test-2 systemd[1]: Starting MySQL Server...
5月 27 17:00:52 test-2 systemd[1]: Started MySQL Server.
[root@test-2 ~]# 

show master status;

stop slave;

change master to master_host='192.168.40.128',master_user='root',master_password='Root@123456',master_log_file='master-bin.000001',master_log_pos=154;

start slave;

show slave status;