MySQL8.4一主一从环境搭建实现
目录
- 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
- 1.2、增加MySQL用户组及用户
- 1.3、编辑配置文件my.cnf
- 1.4、解压
- 1.5、mysql初始化
- 1.6、安全模式启动mysql
- 1.7、设置软连接sock软连接
- 1.8、编辑环境变量mysql home目录及登陆提示
- 1.9、登陆mysql设置密码
- 1.10、设置service mysqld 服务
- 二、数据准备，模拟生产的环境
- 2.1、主节点创建库及测试表
- 三、搭建主从及测试
- 3.1、设置复制源配置
- 3.2、为复制创建用户
- 3.3、获取复制源的二进制日志位置
- 3.4、主节点备份及上传到备节点
- 3.5、设置副本
- 3.5.1、调整server_id
- 3.5.2、导入数据
- 3.5.3、配置连接到主服务器的相关信息
- 3.5.4、启动从服务器的复制线程
- 3.6、验证
- 3.7、在线启用 GTID 事务
- 3.7.1、主库
- 3.7.2、从库
- 3.7.3、修改配置文件
- 3.7.4、主节点模拟增量数据产生及数据同步
- 3.8、主备切换
- 3.8.1、设置主库只读
- 3.8.2、查看从库进程状态
- 3.8.3、主备节点两边的executed_gtid集合对比
- 3.8.4、从库停掉复制进程并清空主从信息(原从库)
- 3.8.5、从库关闭只读(原从库)
- 3.8.6、主库设置执行原主库转为从库
- 3.8.7、检查验证
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
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
/mysql/app/mysql/bin/mysqld_safe --defaults-file=/mysql/data/3306/my.cnf &
1.7、设置软连接sock软连接
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
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 <<EOF
ALTER USER 'root'@'localhost' IDENTIFIED BY 'Root@2024';
EOF
sleep 1
mysql -uroot -p
create user 'root'@'%' identified by 'Root@2024';
grant all privileges on *.* to 'root'@'%';
flush privileges;
exit
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 $remote_fs
# Default-Start: 2 3 4 5
# Default-Stop: 0 1 6
# Short-Description: start and stop MySQL
# Description: MySQL is a very fast and reliable SQL database engine.
### END INIT INFO
# If you install MySQL on some other places than /usr/local/mysql, then you
# have to do one of the following things for this script to work:
#
# - Run this script from within the MySQL installation directory
# - Create a /etc/my.cnf file with the following information:
# [mysqld]
# basedir=<path-to-mysql-installation-directory>
# - Add the above to any other configuration file (for example ~/.my.ini)
# and copy my_print_defaults to /usr/bin
# - Add the path to the mysql-installation-directory to the basedir variable
# below.
#
# If you want to affect other MySQL variables, you should make your changhttp://www.devze.comes
# in the /etc/my.cnf, ~/.my.cnf or other MySQL configuration files.
# If you change base dir, you must also change datadir. These may get
# overwritten by settings in the MySQL configuration files.
basedir=/mysql/app/mysql
datadir=/mysql/data/3306/data
# Default value, in seconds, afterwhich the script should timeout waiting
# for server start.
# Value here is overriden by value in my.cnf.
# 0 means don't wait at all
# Negative numbers mean to wait indefinitely
service_startup_timeout=900
# Lock directory for RedHat / SuSE.
lockdir='/var/lock/subsys'
lock_file_path="$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 "testing\c"`,`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)."
returwww.devze.comn 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 < "$mysqld_pid_file_path"
kill -HUP $mysqld_pid && log_success_msg "Reloading service MySQL"
touch "$mysqld_pid_file_path"
else
log_failure_msg "MySQL PID file could not be found!"
exit 1
fi
;;
'status')
# First, check to see if pid file exists
if test -s "$mysqld_pandroidid_file_path" ; then
read mysqld_pid < "$mysqld_pid_file_path"
if kill -0 $mysqld_pid 2>/dev/null ; then
log_success_msg "MySQL running ($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 www.devze.com]"
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
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
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：
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
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
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
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
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
show replica status \G;
确认参数项
Slave_IO_Running 参数值为YESSlave_SQL_Running 参数值为YESSeconds_Behind_Master 参数值为 03.8.3、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 | | +----------编程------------------------+-------------------------------------------+ 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
show replica status \G;
新主节点原从节点80.51
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
select * from db01.t_city_list;
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