1: Open three virtual machines or three containers
docker run -itd --name mysql_m -p 3307:3306 -e MYSQL_ROOT_PASSWORD=123456 mysql:5.7.35
docker run -itd --name mysql_s1 -p 3308:3306 -e MYSQL_ROOT_PASSWORD=123456 mysql:5.7.35
docker run -itd --name mysql_s2 -p 3309:3306 -e MYSQL_ROOT_PASSWORD=123456 mysql:5.7.35
2: Set one of them as the master and the other two as slaves.
docker cp 容器名称:/etc/mysql/conf.d/docker.cnf m.cnf
三个复制过来，主mysql的上面加上
设置server-id
开启bin-log
从机上只用加server-id
三个的server-id应该不同
host
[mysqld]
skip-host-cache
skip-name-resolve
server-id=1
log-bin=master-bin
from
[mysqld]
skip-host-cache
skip-name-resolve
server-id=2
After the modification is completed, place the corresponding files in the corresponding containers.
3: Set up the main
1: Enter the database and create a user
create user 'rep'@'%' identified by '123456';
2: Authorize new users
grant replication slave on *.* to 'rep'@'%';
3: Refresh permissions
flush privileges;
4: Try to log in as a new user
mysql -urep -p123456
5: Check the log number and position number
show master status;
4: Set up the slave
change master to
master_host="192.168.128.138",master_port=3307,
master_user="rep",
master_password="123456",
master_log_file="master-bin.000001",
master_log_pos=737;
strat slave;
5: Verification
show slave status \GIt is valid
if the bottom two are both
YES