MySQL8.4一主一从环境搭建实现-IT俱乐部

一、MySQL数据库服务环境搭建

1.1、下载及上传mysql二进制安装包

下载地址

MySQL :: Download MySQL Community Server

上传mysql-8.4.0-linux-glibc2.17-x86_64.tar.xz到soft目录

1	`ls` `-lsa` `/soft`

1.2、增加MySQL用户组及用户

groupadd mysql
useradd -r -s /bin/false -g mysql mysql
 
mkdir -p /mysql/data/3306/data
mkdir -p /mysql/backup/backup-db
 
chown -R mysql:mysql /mysql

1.3、编辑配置文件my.cnf

vi /mysql/data/3306/my.cnf

[mysqld]
server-id=573306
port=3306
basedir=/mysql/app/mysql
datadir=/mysql/data/3306/data
log-error=/mysql/log/3306/superdb-error.log
socket=/mysql/data/3306/mysql.sock
pid-file=/mysql/data/3306/mysql.pid
character-set-server=utf8mb4
lower_case_table_names=1
innodb_log_file_size=1G
default-storage-engine=INNODB
mysql_native_password=on
secure_file_priv=''

[mysql]
prompt=(\u@\h)[\d]>\_
 
[client]
port=3306
default-character-set=utf8mb4

1.4、解压

cd /soft
ls
xz -d mysql-8.4.0-linux-glibc2.17-x86_64.tar.xz
tar xvf mysql-8.4.0-linux-glibc2.17-x86_64.tar
mv mysql-8.4.0-linux-glibc2.17-x86_64 /mysql/app/mysql

1.5、mysql初始化

/mysql/app/mysql/bin/mysqld  --defaults-file=/mysql/data/3306/my.cnf  --initialize --user=mysql --basedir=/mysql/app/mysql --datadir=/mysql/data/3306/data

1.6、安全模式启动mysql

1	`/mysql/app/mysql/bin/mysqld_safe --defaults-file=/mysql/data/3306/my.cnf &`

1.7、设置软连接sock软连接

1	`ln` `-sf` `/mysql/data/3306/mysql.sock` `/tmp/mysql.sock`

1.8、编辑环境变量mysql home目录及登陆提示

vi ~/.bash_profile

PATH=$PATH:/mysql/app/mysql/bin:$HOME/bin
export MYSQL_PS1="(u@h:p)[d]>"

source ~/.bash_profile

1	`tail -fn300 /mysql/log/3306/superdb-error.log`

1.9、登陆mysql设置密码

defaultmysqlpwd=`grep 'A temporary password' /mysql/log/3306/superdb-error.log |awk -F "root@localhost: " '{ print $2}' |tail -n1`
mysql -uroot -p"${defaultmysqlpwd}" --connect-expired-password

1.10、设置service mysqld 服务

mv /mysql/app/mysql/support-files/mysql.server /mysql/app/mysql/support-files/mysql.server.bak

vi /mysql/app/mysql/support-files/mysql.server

#!/bin/sh
# Copyright Abandoned 1996 TCX DataKonsult AB & Monty Program KB & Detron HB
# This file is public domain and comes with NO WARRANTY of any kind
 
# MySQL daemon start/stop script.
 
# Usually this is put in /etc/init.d (at least on machines SYSV R4 based
# systems) and linked to /etc/rc3.d/S99mysql and /etc/rc0.d/K01mysql.
# When this is done the mysql server will be started when the machine is
# started and shut down when the systems goes down.
 
# Comments to support chkconfig on RedHat Linux
# chkconfig: 2345 64 36
# description: A very fast and reliable SQL database engine.
 
# Comments to support LSB init script conventions
### BEGIN INIT INFO
# Provides: mysql
# Required-Start: $local_fs $network $remote_fs
# Should-Start: ypbind nscd ldap ntpd xntpd
# Required-Stop: $local_fs $network $remote_fs
# Default-Start:  2 3 4 5
# Default-Stop: 0 1 6
# Short-Description: start and stop MySQL
# Description: MySQL is a very fast and reliable SQL database engine.
### END INIT INFO
  
# If you install MySQL on some other places than /usr/local/mysql, then you
# have to do one of the following things for this script to work:
#
# - Run this script from within the MySQL installation directory
# - Create a /etc/my.cnf file with the following information:
#   [mysqld]
#   basedir=
# - Add the above to any other configuration file (for example ~/.my.ini)
#   and copy my_print_defaults to /usr/bin
# - Add the path to the mysql-installation-directory to the basedir variable
#   below.
#
# If you want to affect other MySQL variables, you should make your changes
# in the /etc/my.cnf, ~/.my.cnf or other MySQL configuration files.
 
# If you change base dir, you must also change datadir. These may get
# overwritten by settings in the MySQL configuration files.
 
basedir=/mysql/app/mysql
datadir=/mysql/data/3306/data
 
# Default value, in seconds, afterwhich the script should timeout waiting
# for server start. 
# Value here is overriden by value in my.cnf. 
# 0 means don't wait at all
# Negative numbers mean to wait indefinitely
service_startup_timeout=900
 
# Lock directory for RedHat / SuSE.
lockdir='/var/lock/subsys'
lock_file_path="$lockdir/mysql"
 
# The following variables are only set for letting mysql.server find things.
 
# Set some defaults
mysqld_pid_file_path=/mysql/data/3306/mysql.pid
if test -z "$basedir"
then
  basedir=/mysql/app/mysql
  bindir=/mysql/app/mysql/bin
  if test -z "$datadir"
  then
    datadir=/mysql/data/3306/data
  fi
  sbindir=/mysql/app/mysql/bin
  libexecdir=/mysql/app/mysql/bin
else
  bindir="$basedir/bin"
  if test -z "$datadir"
  then
    datadir="/mysql/app/3306/data"
  fi
  sbindir="$basedir/sbin"
  libexecdir="$basedir/libexec"
fi
 
# datadir_set is used to determine if datadir was set (and so should be
# *not* set inside of the --basedir= handler.)
datadir_set=
 
#
# Use LSB init script functions for printing messages, if possible
#
lsb_functions="/lib/lsb/init-functions"
if test -f $lsb_functions ; then
  . $lsb_functions
else
  log_success_msg()
  {
    echo " SUCCESS! $@"
  }
  log_failure_msg()
  {
    echo " ERROR! $@"
  }
fi
 
PATH="/sbin:/usr/sbin:/bin:/mysql/app/mysql/bin:/usr/bin:$basedir/bin"
export PATH
 
mode=$1    # start or stop
 
[ $# -ge 1 ] && shift
 
 
other_args="$*"   # uncommon, but needed when called from an RPM upgrade action
           # Expected: "--skip-networking --skip-grant-tables"
           # They are not checked here, intentionally, as it is the resposibility
           # of the "spec" file author to give correct arguments only.
 
case `echo "testingc"`,`echo -n testing` in
    *c*,-n*) echo_n=   echo_c=     ;;
    *c*,*)   echo_n=-n echo_c=     ;;
    *)       echo_n=   echo_c='c' ;;
esac
 
parse_server_arguments() {
  for arg do
    case "$arg" in
      --basedir=*)  basedir=`echo "$arg" | sed -e 's/^[^=]*=//'`
                    bindir="$basedir/bin"
            if test -z "$datadir_set"; then
              datadir="$basedir/data"
            fi
            sbindir="$basedir/sbin"
            libexecdir="$basedir/libexec"
        ;;
      --datadir=*)  datadir=`echo "$arg" | sed -e 's/^[^=]*=//'`
            datadir_set=1
    ;;
      --pid-file=*) mysqld_pid_file_path=`echo "$arg" | sed -e 's/^[^=]*=//'` ;;
      --service-startup-timeout=*) service_startup_timeout=`echo "$arg" | sed -e 's/^[^=]*=//'` ;;
    esac
  done
}
 
wait_for_pid () {
  verb="$1"           # created | removed
  pid="$2"            # process ID of the program operating on the pid-file
  pid_file_path="$3" # path to the PID file.
 
  i=0
  avoid_race_condition="by checking again"
 
  while test $i -ne $service_startup_timeout ; do
 
    case "$verb" in
      'created')
        # wait for a PID-file to pop into existence.
        test -s "$pid_file_path" && i='' && break
        ;;
      'removed')
        # wait for this PID-file to disappear
        test ! -s "$pid_file_path" && i='' && break
        ;;
      *)
        echo "wait_for_pid () usage: wait_for_pid created|removed pid pid_file_path"
        exit 1
        ;;
    esac
 
    # if server isn't running, then pid-file will never be updated
    if test -n "$pid"; then
      if kill -0 "$pid" 2>/dev/null; then
        :  # the server still runs
      else
        # The server may have exited between the last pid-file check and now.  
        if test -n "$avoid_race_condition"; then
          avoid_race_condition=""
          continue  # Check again.
        fi
 
        # there's nothing that will affect the file.
        log_failure_msg "The server quit without updating PID file ($pid_file_path)."
        return 1  # not waiting any more.
      fi
    fi
 
    echo $echo_n ".$echo_c"
    i=`expr $i + 1`
    sleep 1
 
  done
 
  if test -z "$i" ; then
    log_success_msg
    return 0
  else
    log_failure_msg
    return 1
  fi
}
 
# Get arguments from the my.cnf file,
# the only group, which is read from now on is [mysqld]
if test -x "$bindir/my_print_defaults";  then
  print_defaults="$bindir/my_print_defaults"
else
  # Try to find basedir in /etc/my.cnf
  conf=/mysql/data/3306/my.cnf
  print_defaults=
  if test -r $conf
  then
    subpat='^[^=]*basedir[^=]*=(.*)$'
    dirs=`sed -e "/$subpat/!d" -e 's//1/' $conf`
    for d in $dirs
    do
      d=`echo $d | sed -e 's/[  ]//g'`
      if test -x "$d/bin/my_print_defaults"
      then
        print_defaults="$d/bin/my_print_defaults"
        break
      fi
    done
  fi
 
  # Hope it's in the PATH ... but I doubt it
  test -z "$print_defaults" && print_defaults="my_print_defaults"
fi
 
#
# Read defaults file from 'basedir'.   If there is no defaults file there
# check if it's in the old (depricated) place (datadir) and read it from there
#
 
extra_args=""
if test -r "/mysql/data/3306/my.cnf"
then
  extra_args="-e /mysql/data/3306/my.cnf"
fi
 
parse_server_arguments `$print_defaults $extra_args mysqld server mysql_server mysql.server`
 
#
# Set pid file if not given
#
if test -z "$mysqld_pid_file_path"
then
  mysqld_pid_file_path=$datadir/`hostname`.pid
else
  case "$mysqld_pid_file_path" in
    /* ) ;;
    * )  mysqld_pid_file_path="$datadir/$mysqld_pid_file_path" ;;
  esac
fi
 
case "$mode" in
  'start')
    # Start daemon
 
    # Safeguard (relative paths, core dumps..)
    cd $basedir
 
    echo $echo_n "Starting MySQL"
    if test -x $bindir/mysqld_safe
    then
      # Give extra arguments to mysqld with the my.cnf file. This script
      # may be overwritten at next upgrade.
      $bindir/mysqld_safe --defaults-file=/mysql/data/3306/my.cnf --datadir="$datadir" --pid-file="$mysqld_pid_file_path" $other_args >/dev/null &
      wait_for_pid created "$!" "$mysqld_pid_file_path"; return_value=$?
 
      # Make lock for RedHat / SuSE
      if test -w "$lockdir"
      then
        touch "$lock_file_path"
      fi
 
      exit $return_value
    else
      log_failure_msg "Couldn't find MySQL server ($bindir/mysqld_safe)"
    fi
    ;;
 
  'stop')
    # Stop daemon. We use a signal here to avoid having to know the
    # root password.
 
    if test -s "$mysqld_pid_file_path"
    then
      # signal mysqld_safe that it needs to stop
      touch "$mysqld_pid_file_path.shutdown"
 
      mysqld_pid=`cat "$mysqld_pid_file_path"`
 
      if (kill -0 $mysqld_pid 2>/dev/null)
      then
        echo $echo_n "Shutting down MySQL"
        kill $mysqld_pid
        # mysqld should remove the pid file when it exits, so wait for it.
        wait_for_pid removed "$mysqld_pid" "$mysqld_pid_file_path"; return_value=$?
      else
        log_failure_msg "MySQL server process #$mysqld_pid is not running!"
        rm "$mysqld_pid_file_path"
      fi
 
      # Delete lock for RedHat / SuSE
      if test -f "$lock_file_path"
      then
        rm -f "$lock_file_path"
      fi
      exit $return_value
    else
      log_failure_msg "MySQL server PID file could not be found!"
    fi
    ;;
 
  'restart')
    # Stop the service and regardless of whether it was
    # running or not, start it again.
    if $0 stop  $other_args; then
      $0 start $other_args
    else
      log_failure_msg "Failed to stop running server, so refusing to try to start."
      exit 1
    fi
    ;;
 
  'reload'|'force-reload')
    if test -s "$mysqld_pid_file_path" ; then
      read mysqld_pid /dev/null ; then
        log_success_msg "MySQL running ($mysqld_pid)"
        exit 0
      else
        log_failure_msg "MySQL is not running, but PID file exists"
        exit 1
      fi
    else
      # Try to find appropriate mysqld process
      mysqld_pid=`pidof $libexecdir/mysqld`
 
      # test if multiple pids exist
      pid_count=`echo $mysqld_pid | wc -w`
      if test $pid_count -gt 1 ; then
        log_failure_msg "Multiple MySQL running but PID file could not be found ($mysqld_pid)"
        exit 5
      elif test -z $mysqld_pid ; then
        if test -f "$lock_file_path" ; then
          log_failure_msg "MySQL is not running, but lock file ($lock_file_path) exists"
          exit 2
        fi
        log_failure_msg "MySQL is not running"
        exit 3
      else
        log_failure_msg "MySQL is running but PID file could not be found"
        exit 4
      fi
    fi
    ;;
    *)
      # usage
      basename=`basename "$0"`
      echo "Usage: $basename  {start|stop|restart|reload|force-reload|status}  [ MySQL server options ]"
      exit 1
    ;;
esac
 
exit 0

cp /mysql/app/mysql/support-files/mysql.server /etc/init.d/mysqld

chmod 775 /etc/init.d/mysqld

chkconfig --list
chkconfig --add mysqld
chkconfig --list

service mysqld status

service mysqld stop

service mysqld start

二、数据准备，模拟生产的环境

2.1、主节点创建库及测试表

create database db01;
use db01;
 
create table dept
( deptno int unsigned auto_increment primary key comment '部门编号',
dname  varchar(15) comment '部门名称'  ,
loc  varchar(50) comment '部门所在位置'
)engine = innodb default charset=utf8mb4 comment='员工部门表';
 
create table emp(
empno int unsigned auto_increment primary key comment '雇员编号',
ename varchar(15)  comment '雇员姓名' ,
job varchar(10)   comment '雇员职位'  ,
mgr int unsigned  comment '雇员对应的领导的编号',
hiredate  date    comment '雇员的雇佣日期' ,
sal decimal(7,2)  comment '雇员的基本工资' ,
comm  decimal(7,2)   comment '奖金'  ,
deptno int unsigned   comment '所在部门' ,
foreign key(deptno) references dept(deptno)
)engine = innodb default charset =utf8mb4 comment='雇员信息表';
 
create table salgrade
(
grade int comment '工资等级',
losal int comment '此等级的最低工资',
hisal int comment '此等级的最高工资'
)engine=innodb default charset=utf8mb4 comment='工资等级表';
 
alter table salgrade add constraint pk_salgrade_primary primary key (grade,losal,hisal);
 
create table bonus
(   ename  varchar(10) comment '雇员姓名',
job    varchar(9) comment '雇员职位',
sal    decimal(7,2) comment '雇员工资',
comm   decimal(7,2) comment '雇员奖金'
)engine=innodb default charset=utf8mb4 comment='雇员奖金表' ;
 
alter table bonus add constraint pk_bonus_primary primary key (ename,job);
 
show full columns from emp;
select * from information_schema.tables where table_schema='db01' and table_name='emp';
select * from information_schema.columns where table_schema='db01' and table_name='emp';
 
insert into dept values (10,'ACCOUNTING','NEW YORK');
insert into dept values (20,'RESEARCH','DALLAS');
insert into dept values (30,'SALES','CHICAGO');
insert into dept values (40,'OPERATIONS','BOSTON');
 
insert into emp values    (7369,'SMITH','CLERK',7902,'1980-12-17',800,null,20);
insert into emp values    (7499,'ALLEN','SALESMAN',7698,'1981-2-20',1600,300,30);
insert into emp values    (7521,'WARD','SALESMAN',7698,'1981-2-22',1250,500,30);
insert into emp values    (7566,'JONES','MANAGER',7839,'1981-4-2',2975,null,20);
insert into emp values    (7654,'MARTIN','SALESMAN',7698,'1981-9-28',1250,1400,30);
insert into emp values    (7698,'BLAKE','MANAGER',7839,'1981-5-1',2850,null,30);
insert into emp values    (7782,'CLARK','MANAGER',7839,'1981-6-9',2450,null,10);
insert into emp values    (7788,'SCOTT','ANALYST',7566,'87-7-13',3000,null,20);
insert into emp values    (7839,'KING','PRESIDENT',null,'1981-11-17',5000,null,10);
insert into emp values    (7844,'TURNER','SALESMAN',7698,'1981-9-8',1500,0,30);
insert into emp values    (7876,'ADAMS','CLERK',7788,'87-7-13',1100,null,20);
insert into emp values    (7900,'JAMES','CLERK',7698,'1981-12-3',950,null,30);
insert into emp values    (7902,'FORD','ANALYST',7566,'1981-12-3',3000,null,20);
insert into emp values    (7934,'MILLER','CLERK',7782,'1982-1-23',1300,null,10);
 
insert into salgrade values (1,700,1200);
insert into salgrade values (2,1201,1400);
insert into salgrade values (3,1401,2000);
insert into salgrade values (4,2001,3000);
insert into salgrade values (5,3001,9999);
commit;

三、搭建主从及测试

3.1、设置复制源配置

1	`show variables` `like` `'%server_id%';`

3.2、为复制创建用户

注意：主从节点都执行，方便后期主从切换

CREATE USER 'repl'@'%' identified by 'Root@3306';
GRANT REPLICATION SLAVE ON *.* TO 'repl'@'%';

测试从库连接主库

1	`mysql -u repl -p -h 192.168.80.50`

3.3、获取复制源的二进制日志位置

在主节点的不同会话中，使用 SHOW BINARY LOG STATUS语句确定当前二进制日志文件名和位置：

1	`SHOW` `BINARY` `LOG STATUS;`

(root@localhost:mysql.sock)[(none)]>SHOW BINARY LOG STATUS;
+---------------+----------+--------------+------------------+-------------------+
| File          | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |
+---------------+----------+--------------+------------------+-------------------+
| binlog.000001 |    11518 |              |                  |                   |
+---------------+----------+--------------+------------------+-------------------+
1 row in set (0.00 sec)

3.4、主节点备份及上传到备节点

使用mysqldump工具创建要复制的所有数据库的转储。这是推荐的方法，尤其是在使用 InnoDB.
mysqldump –all-databases –master-data > dbdump.db
如果不使用 –master-data，则需要手动锁定单独会话中的所有表 –ignore-table使用选项排除数据库中的所有表 –databases选项仅命名要转储的那些数据库

cd /mysql/backup/backup-db
mysqldump  -uroot  -p  --all-databases  --master-data=1 > dbfulldump.db

du -sh dbfulldump.db

从节点检查目录是的否存在

1	`mkdir` `-p` `/mysql/backup/backup-db`

拷贝主节点的备份到从节点

scp -r /mysql/backup/backup-db/dbfulldump.db root@192.168.80.51:/mysql/backup/backup-db

3.5、设置副本

3.5.1、调整server_id

show variables like '%server%';
+---------------------------------+--------------------------------------+
| Variable_name                   | Value                                |
+---------------------------------+--------------------------------------+
| character_set_server            | utf8mb4                              |
| collation_server                | utf8mb4_0900_ai_ci                   |
| immediate_server_version        | 999999                               |
| innodb_dedicated_server         | OFF                                  |
| innodb_ft_server_stopword_table |                                      |
| original_server_version         | 999999                               |
| server_id                       | 513306                               |
| server_id_bits                  | 32                                   |
| server_uuid                     | 81c80be9-10d4-11ef-b4df-000c290e14ee |
+---------------------------------+--------------------------------------+
9 rows in set (0.00 sec)

3.5.2、导入数据

show databases;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| mysql              |
| performance_schema |
| sys                |
+--------------------+
4 rows in set (0.00 sec)

source dbdump.db

3.5.3、配置连接到主服务器的相关信息

CHANGE REPLICATION SOURCE TO SOURCE_HOST='192.168.80.50', SOURCE_LOG_FILE='binlog.000001', SOURCE_LOG_POS=11518, SOURCE_PORT=3306, SOURCE_USER='repl', SOURCE_PASSWORD='Root@3306';

3.5.4、启动从服务器的复制线程

1	`start REPLICA;`

3.6、验证

show REPLICA status G
show processlist G
select * from db01.emp;
select * from db01.dept;

3.7、在线启用 GTID 事务

3.7.1、主库

SET @@GLOBAL.ENFORCE_GTID_CONSISTENCY = WARN;
SET @@GLOBAL.ENFORCE_GTID_CONSISTENCY = ON;
SET @@GLOBAL.GTID_MODE = OFF_PERMISSIVE;
SET @@GLOBAL.GTID_MODE = ON_PERMISSIVE;
SHOW STATUS LIKE 'ONGOING_ANONYMOUS_TRANSACTION_COUNT';
SET @@GLOBAL.GTID_MODE = ON;

3.7.2、从库

SET @@GLOBAL.ENFORCE_GTID_CONSISTENCY = WARN;
SET @@GLOBAL.ENFORCE_GTID_CONSISTENCY = ON;
SET @@GLOBAL.GTID_MODE = OFF_PERMISSIVE;
SET @@GLOBAL.GTID_MODE = ON_PERMISSIVE;
SHOW STATUS LIKE 'ONGOING_ANONYMOUS_TRANSACTION_COUNT';
SET @@GLOBAL.GTID_MODE = ON;
stop replica;
CHANGE REPLICATION SOURCE TO SOURCE_AUTO_POSITION = 1 ;
START replica;

3.7.3、修改配置文件

gtid_mode = ON
enforce_gtid_consistency = ON

3.7.4、主节点模拟增量数据产生及数据同步

CREATE TABLE t_city_list(
id bigint auto_increment,
country VARCHAR(64),
city VARCHAR(64),
constraint pk_t_city_list_id primary key(id)
);
 
INSERT INTO t_city_list(country,city) VALUES ('中国','北京');
INSERT INTO t_city_list(country,city) VALUES ('中国','广州');
INSERT INTO t_city_list(country,city) VALUES ('中国','深圳');
INSERT INTO t_city_list(country,city) VALUES ('中国','香港');
INSERT INTO t_city_list(country,city) VALUES ('中国','上海');
INSERT INTO t_city_list(country,city) VALUES ('日本','东京');
INSERT INTO t_city_list(country,city) VALUES ('日本','大阪');
commit;
 
select * from db01.t_city_list

从节点检查

1	`select` `*` `from` `t_city_list;`

主节点再次新增数据

INSERT INTO t_city_list(country,city) VALUES ('中国','中山');
INSERT INTO t_city_list(country,city) VALUES ('中国','珠海');

从节点再次检查数据同步情况

1	`select` `*` `from` `t_city_list;`

3.8、主备切换

3.8.1、设置主库只读

set global read_only=ON;
set global super_read_only=ON;

3.8.2、查看从库进程状态

1	`show replica status G;`

确认参数项
Slave_IO_Running 参数值为YES
Slave_SQL_Running 参数值为YES
Seconds_Behind_Master 参数值为 0

3.8.3、主备节点两边的executed_gtid集合对比

select @@global.gtid_executed;
+-------------------------------------------+
| @@global.gtid_executed                    |
+-------------------------------------------+
| e9adc552-10d5-11ef-81ba-000c2940f616:1-10 |
+-------------------------------------------+
1 row in set (0.00 sec)
 
show global variables like 'gtid_%';
+----------------------------------+-------------------------------------------+
| Variable_name                    | Value                                     |
+----------------------------------+-------------------------------------------+
| gtid_executed                    | e9adc552-10d5-11ef-81ba-000c2940f616:1-10 |
| gtid_executed_compression_period | 0                                         |
| gtid_mode                        | ON                                        |
| gtid_owned                       |                                           |
| gtid_purged                      |                                           |
+----------------------------------+-------------------------------------------+
5 rows in set (0.00 sec)

3.8.4、从库停掉复制进程并清空主从信息(原从库)

stop replica;
reset replica all;

3.8.5、从库关闭只读(原从库)

set global read_only=off;
set global super_read_only=off;

3.8.6、主库设置执行原主库转为从库

CHANGE MASTER TO MASTER_HOST='192.168.80.51',MASTER_PORT=3306, MASTER_USER='repl', MASTER_PASSWORD='Root@3306',master_auto_position=1; #mysql5.7/mysql8.0
 
CHANGE REPLICATION SOURCE TO SOURCE_HOST='192.168.80.51',SOURCE_PORT=3306,SOURCE_USER='repl', SOURCE_PASSWORD='Root@3306',SOURCE_auto_position=1; #mysql8.4
 
start replica;

3.8.7、检查验证

新从节点原主节点80.50

1	`show replica status G;`

新主节点原从节点80.51

1	`INSERT` `INTO` `db01.t_city_list(country,city)` `VALUES` `('中国','兰州');`

新主从节点检查数据同步情况

1	`select` `*` `from` `db01.t_city_list;`

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