Mysql-mmm配置全自动切换主从关系和读写分离

Mysql-mmm配置全自动切换主从关系和读写分离

作者:admin 时间:2011-12-11 分类:服务器 网站开发 评论:0条 浏览:3601

mysql-mmm的作用很简单就是读和写以ip的形式分离出来,并且可以全自动对mysql主从配置进行故障切换。

整个架构如下图:


操作系统全部为centos5.5 32bit

mysql版本为mysql-5.1.59

mysql-mmm版本为mysql-mmm-2.2.1

另外还需要4个虚拟IP,作用为:

192.168.93.141 数据库写入ip

192.168.93.142 数据库读取ip

192.168.93.143 数据库读取ip

192.168.93.144 数据库读取ip

一、安装mysql

 

useradd mysql
tar zxvf mysql-5.1.59.tar.gz
cd mysql-5.1.59
./configure –prefix=/usr/local/mysql –without-debug –enable-thread-safe-client –enable-assembler –enable-profiling –with-mysqld-ldflags=-all-static –with-client-ldflags=-all-static –with-charset=utf8 –with-extra-charsets=all –with-big-tables –enable-largefile –without-ndb-debug –with-plugins=partition –localstatedir=/home/var
make
make install

vi /etc/my.cnf

[client]
port = 3306
socket = /tmp/mysql.sock
[mysqld]
port = 3306
socket = /tmp/mysql.sock

skip-external-locking
#skip-bdb
skip-name-resolve
#skip-innodb
max_allowed_packet = 8M
table_cache = 2048
sort_buffer_size = 2M
read_buffer_size = 2M
query_cache_limit = 2M
myisam_sort_buffer_size = 128M
thread_cache_size = 256
query_cache_size = 128M
thread_concurrency = 8

log-bin=mysql-bin
slow_query_log=slowquery.log
long_query_time = 60

character-set-server=utf8
max_user_connections=5000
max_connections=8000
wait_timeout=31536000
tmp_table_size = 384M
bulk_insert_buffer_size = 512M
concurrent_insert = 2
back_log = 512

[mysqldump]
quick
max_allowed_packet = 16M

[isamchk]
key_buffer = 512M
sort_buffer_size = 512M
read_buffer = 2M
write_buffer = 2M

[myisamchk]
key_buffer = 512M
sort_buffer_size = 512M
read_buffer = 2M
write_buffer = 2M

[mysqlhotcopy]
interactive-timeout
datadir=/home/var

[mysqld_safe]
open_files_limit = 65535

保存退出!

继续安装Mysql

 

/usr/local/mysql/bin/mysql_install_db –user=mysql
chown -R mysql:mysql /home/var
/usr/local/mysql/bin/mysqld_safe –user=mysql &
cp ./support-files/mysql.server /etc/rc.d/init.d/mysql
chmod +x /etc/rc.d/init.d/mysql

chkconfig –add mysql
service mysql start
/usr/local/mysql/bin/mysqladmin -u root password 123456

vi ~/.bash_profile

PATH=$PATH:$HOME/bin:/usr/local/mysql/bin/

追加蓝色部分,然后保存退出

使配置立即生效

source ~/.bash_profile

二、配置主从关系

DB1:编辑/etc/my.cnf,加入以下内容:

 

server-id=1
log-bin=mysql-bin
binlog_format=ROW
log-slave-updates
sync_binlog=1
auto_increment_increment=2
auto_increment_offset=1
skip_slave_start

DB2:编辑/etc/my.cnf,加入以下内容:

 

server-id=2
log-bin=mysql-bin
binlog_format=ROW
log-slave-updates
sync_binlog=1
auto_increment_increment=2
auto_increment_offset=2

DB3:编辑/etc/my.cnf,加入以下内容:

server-id=3
log-bin=mysql-bin
log-slave-updates

然后重启mysql服务!

接下创建一个同步用的帐号并授权:

DB1授权:

mysql -uroot -p123456 -e “GRANT REPLICATION SLAVE ON *.* TO ‘slave’@’192.168.93.138’ IDENTIFIED BY ‘slave’; ”
mysql -uroot -p123456 -e “GRANT REPLICATION SLAVE ON *.* TO ‘slave’@’192.168.93.139’ IDENTIFIED BY ‘slave’; “

DB2授权:

mysql -uroot -p123456 -e “GRANT REPLICATION SLAVE ON *.* TO ‘slave’@’192.168.93.137’ IDENTIFIED BY ‘slave’; ”
mysql -uroot -p123456 -e “GRANT REPLICATION SLAVE ON *.* TO ‘slave’@’192.168.93.139’ IDENTIFIED BY ‘slave’; “

DB3的话以谁为主都无所谓,当主出现故障的时候,mmm会自动切换主的,我这里就以DB2为主,配置方从的步骤:锁表——(主)导出数据——(主)查看指针位置——(主)解锁——(从)导入数据——(从)导入主服务器的指针位置——(双方)开启主从线程

DB2:(PS我这里是新的数据库,所以省了导出数据这一步!)

 

mysql> flush tables with read lock;
mysql> show master status;
+——————+———-+————–+——————+
| File | Position | Binlog_Do_DB | Binlog_Ignore_DB |
+——————+———-+————–+——————+
| mysql-bin.000004 | 586 | | |
+——————+———-+————–+——————+
1 row in set (0.00 sec)

mysql> unlock tables;

得出指针位置之后在DB1和DB3上操作:

 

mysql> change master to
-> master_host=’192.168.93.138′,
-> master_user=’slave’,
-> master_password=’slave’,
-> master_log_file=’mysql-bin.000004′,
-> master_log_pos=586,
-> master_connect_retry=10;
Query OK, 0 rows affected (0.04 sec)

mysql> slave start;
Query OK, 0 rows affected (0.00 sec)

mysql> show slave status\G;
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 192.168.93.138
Master_User: slave
Master_Port: 3306
Connect_Retry: 10
Master_Log_File: mysql-bin.000004
Read_Master_Log_Pos: 586
Relay_Log_File: localhost-relay-bin.000002
Relay_Log_Pos: 251
Relay_Master_Log_File: mysql-bin.000004
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
Replicate_Do_DB:
Replicate_Ignore_DB:
Replicate_Do_Table:
Replicate_Ignore_Table:
Replicate_Wild_Do_Table:
Replicate_Wild_Ignore_Table:
Last_Errno: 0
Last_Error:
Skip_Counter: 0
Exec_Master_Log_Pos: 586
Relay_Log_Space: 410
Until_Condition: None
Until_Log_File:
Until_Log_Pos: 0
Master_SSL_Allowed: No
Master_SSL_CA_File:
Master_SSL_CA_Path:
Master_SSL_Cert:
Master_SSL_Cipher:
Master_SSL_Key:
Seconds_Behind_Master: 0
Master_SSL_Verify_Server_Cert: No
Last_IO_Errno: 0
Last_IO_Error:
Last_SQL_Errno: 0
Last_SQL_Error:
1 row in set (0.01 sec)

看见蓝色那两行已经yes了,表示配置成功,刚才一口气把DB2配成DB1和DB3的主,现在要把DB1配成DB2的主,实现DB1和DB2互为主从关系

查看DB1的指针位置:

 

mysql> show master status;
+——————+———-+————–+——————+
| File | Position | Binlog_Do_DB | Binlog_Ignore_DB |
+——————+———-+————–+——————+
| mysql-bin.000005 | 586 | | |
+——————+———-+————–+——————+
1 row in set (0.00 sec)

然后在DB2上导入指针位置:

 

mysql> change master to
-> master_host=’192.168.93.137′,
-> master_user=’slave’,
-> master_password=’slave’,
-> master_log_file=’mysql-bin.000005′,
-> master_log_pos=586,
-> master_connect_retry=10;
Query OK, 0 rows affected (0.01 sec)

mysql> slave start;
Query OK, 0 rows affected (0.00 sec)

mysql> show slave status\G;
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 192.168.93.137
Master_User: slave
Master_Port: 3306
Connect_Retry: 10
Master_Log_File: mysql-bin.000005
Read_Master_Log_Pos: 586
Relay_Log_File: localhost-relay-bin.000002
Relay_Log_Pos: 251
Relay_Master_Log_File: mysql-bin.000005
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
Replicate_Do_DB:
Replicate_Ignore_DB:
Replicate_Do_Table:
Replicate_Ignore_Table:
Replicate_Wild_Do_Table:
Replicate_Wild_Ignore_Table:
Last_Errno: 0
Last_Error:
Skip_Counter: 0
Exec_Master_Log_Pos: 586
Relay_Log_Space: 410
Until_Condition: None
Until_Log_File:
Until_Log_Pos: 0
Master_SSL_Allowed: No
Master_SSL_CA_File:
Master_SSL_CA_Path:
Master_SSL_Cert:
Master_SSL_Cipher:
Master_SSL_Key:
Seconds_Behind_Master: 0
Master_SSL_Verify_Server_Cert: No
Last_IO_Errno: 0
Last_IO_Error:
Last_SQL_Errno: 0
Last_SQL_Error:
1 row in set (0.00 sec)

现在三台DB的主从关系都配置好了,可以测试一下:

在DB1的test库建个表,在DB2插入一条数据,在DB3查看

DB1:

mysql> create table test.t (id int(11) not null auto_increment,name varchar(30),primary key (id));
Query OK, 0 rows affected (0.03 sec)

DB2:

 

mysql> use test
Database changed
mysql> show tables;
+—————-+
| Tables_in_test |
+—————-+
| t |
+—————-+
1 row in set (0.00 sec)

mysql> insert into t(name) values (‘mysql-mmm’);
Query OK, 1 row affected (0.02 sec)

DB3:

mysql> use test
Database changed
mysql> select * from t;
+—-+———–+
| id | name |
+—-+———–+
| 2 | mysql-mmm |
+—-+———–+
1 row in set (0.00 sec)

DB1:

 

mysql> select * from test.t;
+—-+———–+
| id | name |
+—-+———–+
| 2 | mysql-mmm |
+—-+———–+
1 row in set (0.00 sec)

OK!三台DB的主从配置正常工作

三、安装mysql-mmm

安装Mysql-mmm之前,需要先安装一些perl模块,安装方法用perl -MCPAN -e shell 直接在线安装,第一次使用perl -MCPAN -e shell 命令时会有一大堆选项的,我直接enter过去,比较关键的是选择地区、国家和源这三个,按的时候注意选择一下就没问题,DB1、DB2和DB3需要安装 以下模块:

# perl -MCPAN -e shell
cpan> install Algorithm::Diff
cpan> install DBI
cpan>install Log::Dispatch
cpan> install Log::Log4perl
cpan> install Mail::Send
cpan> install Net::ARP
cpan> install Proc::Daemon
cpan> install Time::HiRes
cpan>install DBD::mysql
cpan>install File::stat
cpan>install File:basename

server4需要安装以下:

 

# perl -MCPAN -e shell
cpan> install Algorithm::Diff
cpan> install Class::Singleton
cpan> install Log::Dispatch
cpan> install Log::Log4perl
cpan> install Mail::Send
cpan> install Proc::Daemon
cpan> install Thread::Queue
cpan> install Time::HiRes

cpan> install DBI
cpan>install DBD::mysql

安装mysql-mmm,四台机器都要安装:

tar zxvf mysql-mmm-2.2.1.tar.gz
cd mysql-mmm-2.2.1
make instal

mysql-mmm文件位置及作用如下:

/usr/lib/perl5/vendor_perl/5.8.8/MMM                 MMM 使用的 perl 模块
/usr/lib/mysql-mmm                                              MMM 的脚本揑件
/usr/sbin                                                               MMM 的命令保存路径
/var/log/mysql-mmm                                             MMM 的日志保存路径
/etc                                                                      MMM 配置文件保存的路径
/etc/mysql-mmm                                                  MMM 配置文件保存的路径,优先级最高
/etc/init.d/                                                            agentd 和 monitor 的启劢关闭脚本  

数据库授权一个Mysql-mmm专用用户(DB1、DB2和DB3都要授权):

mysql -uroot -p123456 -e “grant super,replication client,process on *.* to ‘mmm_agent’@’192.168.93.137’ identified by ‘mmm_agent’;”
mysql -uroot -p123456 -e “grant super,replication client,process on *.* to ‘mmm_agent’@’192.168.93.138’ identified by ‘mmm_agent’;”
mysql -uroot -p123456 -e “grant super,replication client,process on *.* to ‘mmm_agent’@’192.168.93.139’ identified by ‘mmm_agent’;”
mysql -uroot -p123456 -e “grant super,replication client,process on *.* to ‘mmm_agent’@’192.168.93.140’ identified by ‘mmm_agent’;”

修改mysql-mmm配置文件:

DB1:

/etc/mysql-mmm/mmm_agent.conf

include mmm_common.conf
this
db1

蓝色的部分DB2和DB3则分别修改为db2和db3

/etc/mysql-mmm/mmm_common.conf

active_master_role      writer
<host default>
cluster_interface                       eth0

pid_path                                /var/run/mmm_agentd.pid
bin_path                                /usr/lib/mysql-mmm/

replication_user        slave
replication_password    slave

agent_user                              mmm_agent
agent_password                          mmm_agent
</host>

<host db1>
ip                                      192.168.93.137
mode                                    master
peer                                    db2
</host>

<host db2>
ip                                      192.168.93.138
mode                                    master
peer                                    db1
</host>

<host db3>
ip                                      192.168.93.139
mode                                    slave
</host>
<role writer>
hosts                                   db1, db2
ips                                     192.168.93.141
mode                                    exclusive
</role>

<role reader>
hosts                                   db1, db2, db3
ips                                     192.168.93.144,192.168.93.143,192.168.93.142
mode                                    balanced
</role>

将这份配置复制至其它三台机器,包括server4,然后启动DB1\、DB2和DB3可以启动mysql-mmm-agant::

[root@localhost mysql-mmm-2.2.1]# /etc/init.d/mysql-mmm-agent start
Daemon bin: ‘/usr/sbin/mmm_agentd’
Daemon pid: ‘/var/run/mmm_agentd.pid’
Starting MMM Agent daemon… Ok

最后配置server4的mysql-mmm-monitor

/etc/mysql-mmm/mmm_mon.conf

include mmm_common.conf

<monitor>
ip                                      192.168.93.140
pid_path                                /var/run/mmm_mond.pid
bin_path                                /usr/lib/mysql-mmm/
status_path                             /var/lib/misc/mmm_mond.status
ping_ips                                192.168.93.137, 192.168.93.138, 192.168.93.139
</monitor>

<host default>
monitor_user                    mmm_agent
monitor_password                mmm_agent
</host>

debug 0

启动mysql-mmm-monitor:

[root@localhost mysql-mmm-2.2.1]# /etc/init.d/mysql-mmm-monitor start
Daemon bin: ‘/usr/sbin/mmm_mond’
Daemon pid: ‘/var/run/mmm_mond.pid’
Starting MMM Monitor daemon: Ok

[root@localhost mysql-mmm-2.2.1]# mmm_control show
db1(192.168.93.137) master/AWAITING_RECOVERY. Roles:
db2(192.168.93.138) master/AWAITING_RECOVERY. Roles:
db3(192.168.93.139) slave/AWAITING_RECOVERY. Roles:

将所有DB服务器设为online状态:

 [root@localhost mysql-mmm-2.2.1]# mmm_control set_online db1
OK: State of ‘db1’ changed to ONLINE. Now you can wait some time and check its new roles!
[root@localhost mysql-mmm-2.2.1]# mmm_control set_online db2
OK: State of ‘db2’ changed to ONLINE. Now you can wait some time and check its new roles!
[root@localhost mysql-mmm-2.2.1]# mmm_control set_online db3
OK: State of ‘db3’ changed to ONLINE. Now you can wait some time and check its new roles!
[root@localhost mysql-mmm-2.2.1]# mmm_control show
db1(192.168.93.137) master/ONLINE. Roles: reader(192.168.93.143), writer(192.168.93.141)
db2(192.168.93.138) master/ONLINE. Roles: reader(192.168.93.142)
db3(192.168.93.139) slave/ONLINE. Roles: reader(192.168.93.144)

设置成功,下面查看节点状态:

 [root@localhost mysql-mmm-2.2.1]# mmm_control checks all
db2  ping         [last change: 2011/10/07 03:10:39]  OK
db2  mysql        [last change: 2011/10/07 03:10:39]  OK
db2  rep_threads  [last change: 2011/10/07 03:10:39]  OK
db2  rep_backlog  [last change: 2011/10/07 03:10:39]  OK: Backlog is null
db3  ping         [last change: 2011/10/07 03:10:39]  OK
db3  mysql        [last change: 2011/10/07 03:10:39]  OK
db3  rep_threads  [last change: 2011/10/07 03:10:39]  OK
db3  rep_backlog  [last change: 2011/10/07 03:10:39]  OK: Backlog is null
db1  ping         [last change: 2011/10/07 03:10:39]  OK
db1  mysql        [last change: 2011/10/07 03:10:39]  OK
db1  rep_threads  [last change: 2011/10/07 03:10:39]  OK
db1  rep_backlog  [last change: 2011/10/07 03:10:39]  OK: Backlog is null

最后将除write机器的DB的read_only状态设为on:

 set global read_only=on;

并写入my.cnf!

在write角色的机器上授权一个帐号给外部登陆:

 mysql -uroot -p123456 -e “grant all  privileges on test.* to lihuipeng@’192.168.93.%’ identified by ‘lihuipeng’;”

然后从另外一台机器上试试登陆四个虚拟IP:

 [root@localhost mysql-mmm-2.2.1]# mysql -ulihuipeng -plihuipeng -h192.168.93.141
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 716
Server version: 5.1.59-log Source distribution

Copyright (c) 2000, 2011, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type ‘help;’ or ‘\h’ for help. Type ‘\c’ to clear the current input statement.

mysql>
[root@localhost mysql-mmm-2.2.1]# mysql -ulihuipeng -plihuipeng -h192.168.93.142
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 554
Server version: 5.1.59-log Source distribution

Copyright (c) 2000, 2011, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type ‘help;’ or ‘\h’ for help. Type ‘\c’ to clear the current input statement.

mysql>

 

[root@localhost mysql-mmm-2.2.1]# mysql -ulihuipeng -plihuipeng -h192.168.93.143
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 758
Server version: 5.1.59-log Source distribution

Copyright (c) 2000, 2011, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type ‘help;’ or ‘\h’ for help. Type ‘\c’ to clear the current input statement.

mysql>

 

[root@localhost mysql-mmm-2.2.1]# mysql -ulihuipeng -plihuipeng -h192.168.93.144
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 560
Server version: 5.1.59-log Source distribution

Copyright (c) 2000, 2011, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type ‘help;’ or ‘\h’ for help. Type ‘\c’ to clear the current input statement.

mysql>

四个ip都可以使用,其它功能大家可以自己去测试一下,这里不多写了,这里主要把数据库的write功能独立出来一个ip,让两台互为主从的机器中 其中一台担任write角色,其余机器担任read角色,出现故障时mysql-mmm可以自动切换write角色和主从关系。

配合amoeba完成真正读写分离:http://lihuipeng.blog.51cto.com/3064864/689103

本文出自 “疯狂的猴子” 博客,请务必保留此出处http://lihuipeng.blog.51cto.com/3064864/689064

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本文链接地址: Mysql-mmm配置全自动切换主从关系和读写分离

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