mysql主从配置小记:
共有四台机器:A(10.1.10.28),B(10.1.10.29),C(10.1.10.30),D(10.1.10.31)。
配置后结果:A-C互为主从,B为A的slave,D为C的slave。
0)准备工作
在四台机器上面安装好mysql后,创建用于同步的账号。
添加账户:
INSERT INTO user (Host,User, Password,Select_priv,Insert_priv,Update_priv,Delete_priv, Create_priv,Drop_priv) VALUES(
'%'
,
'test'
,password(
'test'
),
'Y'
,
'Y'
,
'Y'
,
'Y'
,
'Y'
,
'Y'
);
|
刷新数据库:
FLUSH PRIVILEGES;
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1)配置A-C互为主从
修改A配置文件为:
server-id = 1
replicate-
do
-db=test
replicate-
do
-db=test_admin
log-bin=mysql-bin
log-slave-updates
replicate-wild-
do
-table=test.%
replicate-wild-
do
-table=test_admin.%
binlog-ignore-db=mysql
slave-skip-errors=all
|
修改C配置文件为:
server-id = 3
binlog-
do
-db=test
binlog-
do
-db=test_admin
log-bin=mysql-bin
log-slave-updates
replicate-wild-
do
-table=test.%
replicate-wild-
do
-table=test_admin.%
binlog-ignore-db=mysql
slave-skip-errors=all
|
重启mysql是配置生效
将A设置为主:
停止同步:
slave stop;
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清空服务器master日志:
reset master;
|
授权同步账号:
GRANT REPLICATION SLAVE ON *.* TO
'test'
@
'%'
IDENTIFIED BY
'test'
;
|
刷新授权:
flush privileges;
|
锁定数据库:
flush tables with read
lock
;
|
将C设置为从:
停止同步:
slave stop;
|
配置同步信息:
CHANGE MASTER TO MASTER_HOST=
'10.1.10.28'
, MASTER_USER=
'test'
, MASTER_PASSWORD=
'test'
, MASTER_LOG_FILE=
'mysql-bin.000001'
, MASTER_LOG_POS=107;
|
将C设置为主:
停止同步:
slave stop;
|
清空服务器master日志:
reset master;
|
授权同步账号:
GRANT REPLICATION SLAVE ON *.* TO
'test'
@
'%'
IDENTIFIED BY
'test'
;
|
刷新授权:
flush privileges;
|
锁定数据库:
flush tables with read
lock
;
|
将A设置为从:
停止同步:
slave stop;
|
配置同步信息:
CHANGE MASTER TO MASTER_HOST=
'10.1.10.30'
, MASTER_USER=
'test'
, MASTER_PASSWORD=
'test'
, MASTER_LOG_FILE=
'mysql-bin.000001'
, MASTER_LOG_POS=107;
|
2)将B设置为A的从
server-id = 2
replicate-
do
-db=test
replicate-
do
-db=test_admin
log-bin=mysql-bin
log-slave-updates
replicate-wild-
do
-table=test.%
replicate-wild-
do
-table=test_admin.%
binlog-ignore-db=mysql
slave-skip-errors=all
|
重启mysql服务
停止同步:
slave stop;
|
配置同步信息:
CHANGE MASTER TO MASTER_HOST=
'10.1.10.28'
, MASTER_USER=
'test'
, MASTER_PASSWORD=
'test'
, MASTER_LOG_FILE=
'mysql-bin.000001'
, MASTER_LOG_POS=107;
|
启动同步:
slave start;
|
3)将D设置为C的从
server-id = 4
replicate-
do
-db=test
replicate-
do
-db=test_admin
log-bin=mysql-bin
log-slave-updates
replicate-wild-
do
-table=test.%
replicate-wild-
do
-table=test_admin.%
binlog-ignore-db=mysql
slave-skip-errors=all
|
重启mysql服务
停止同步:
slave stop;
|
配置同步信息:
CHANGE MASTER TO MASTER_HOST=
'10.1.10.30'
, MASTER_USER=
'test'
, MASTER_PASSWORD=
'test'
, MASTER_LOG_FILE=
'mysql-bin.000001'
, MASTER_LOG_POS=107;
|
启动同步:
slave start;
|
完成之后可以创建添加数据测试一下是否可以。
下面是常见错误处理:
1)
change master导致的:
Last_IO_Error: error connecting to master
'repl1@IP:3306'
- retry-time: 60 retries
2)
在没有解锁的情况下停止slave进程:
mysql> stop slave;
ERROR 1192 (HY000): Can't execute the given command because you have active locked tables or an active transaction
3)
change master语法错误,落下逗号
mysql> change master to
-> master_host=
'IP'
-> master_user=
'USER'
,
-> master_password=
'PASSWD'
,
-> master_log_file=
'mysql-bin.000002'
,
-> master_log_pos=106;
ERROR 1064 (42000): You have an error
in
your SQL syntax; check the manual that corresponds to your MySQL server version
for
the right syntax to use near
'master_user='
USER',
master_password=
'PASSWD'
,
master_log_file=
'mysql-bin.000002'
at line 3
4)
在没有停止slave进程的情况下change master
mysql> change master to master_host=‘IP
', master_user='
USER
', master_password='
PASSWD
', master_log_file='
mysql-bin.000001',master_log_pos=106;
ERROR 1198 (HY000): This operation cannot be performed with a running slave; run STOP SLAVE first
5)
A B的server-id相同:
Last_IO_Error: Fatal error: The slave I/O thread stops because master and slave have equal MySQL server ids;
these ids must be different
for
replication to work (or the --replicate-same-server-id option must be used on
slave but
this
does not always make sense; please check the manual before
using
it).
查看server-id
mysql> show variables like
'server_id'
;
手动修改server-id
mysql>
set
global server_id=2; #此处的数值和my.cnf里设置的一样就行
mysql> slave start;
6)change master之后,查看slave的状态,发现slave_IO_running 为NO
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