实现MySQL读写分离
部署集群基础环境1 实现MySQL读写分离
1.1 问题
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本案例要求配置2台MySQL服务器+1台代理服务器，实现MySQL代理的读写分离：
用户只需要访问MySQL代理服务器，而实际的SQL查询、写入操作交给后台的2台MySQL服务器来完成
其中Master服务器允许SQL查询、写入，Slave服务器只允许SQL查询1.2 方案
使用4台RHEL 7.2虚拟机，如图-1所示。其中192.168.4.10、192.168.4.20分别作为MySQL主、从服务器，是整个服务的后端；另一台192.168.4.100作为MySQL代理服务器，是直接面向客户的服务前端；客户机192.168.4.120用作访问测试。
图－1
对比两种方式的读写分离效果——
MySQL主从复制：客户机访问Master服务器来写数据库，客户机访问Slave服务器来读数据库。这种情况下，需要客户端自行区分向何处写、从何处读。
MySQL主从复制+代理：客户机访问Proxy服务器，读、写请求交给Proxy识别，如果是写数据库操作则交给Master，如果是读数据库操作则交给Slave处理，具体由分配策略控制。这种情况下，无需客户端区分读、写目标，而是由Proxy服务器代劳了，从而降低了客户端程序的复杂度。其中MySQL主、从复制结构的搭建参考前面的课程，这里不再赘述。
1.3 步骤
实现此案例需要按照如下步骤进行。
步骤一：部署mysql-proxy代理服务器
1）安装mariadb官方提供的maxscale软件包
[root@bogon ~]# rpm -ivh maxscale-2.1.2-1.rhel.7.x86_64.rpm 修改配置文件：
[root@pxysvr pub]# [root@bogon ~]# grep -E -v '^#' /etc/maxscale.cnf
[maxscale]
threads=1
[server1] #指定ip地址对应的名字
type=server
address=192.168.4.10 #主数据库服务器ip地址
port=3306
protocol=MySQLBackend
[server2] #指定ip地址对应的名字
type=server
address=192.168.4.20 #从数据库服务器ip地址
port=3306
protocol=MySQLBackend
[MySQL Monitor] #指定要监控的主机 和监控时连接的用户
type=monitor
module=mysqlmon
servers=server1， server2 #前边定义的主机名
user=scalemon # 用户名
passwd=111111 # 密码
monitor_interval=10000
#[Read-Only Service]
#type=service
#router=readconnroute
#servers=server1
#user=myuser
#passwd=mypwd
#router_options=slave
[Read-Write Service] #定义服务器列表
type=service
router=readwritesplit
servers=server1， server2 #前边定义的主机名
user=maxscale # 用户名
passwd=111111 # 密码
max_slave_connections=100%
[MaxAdmin Service]
type=service
router=cli
#[Read-Only Listener]
#type=listener
#service=Read-Only Service
#protocol=MySQLClient
#port=4008
[Read-Write Listener]
type=listener
service=Read-Write Service
protocol=MySQLClient
port=4006
[MaxAdmin Listener]
type=listener
service=MaxAdmin Service
protocol=maxscaled
socket=default
[root@bogon ~]# 分别在主、从数据库服务器上添加授权用户（只在主服务器授权即可 从服务器会自动同步）：
[root@pxysvr pub]# mysql> grant replication slave, replication client on *.* to scalemon@'%' identified by “111111”; //创建监控用户
mysql> grant select on mysql.* to maxscale@'%' identified by “111111”; //创建路由用户
mysql> grant all on *.* to student@'%' identified by “111111”;
//创建客户端访问用户 2）启动maxscale服务
[root@bogon ~]# maxscale --config=/etc/maxscale.cnf
[root@bogon ~]# netstat -utnalp | grep maxscale
tcp 0 0 192.168.4.100:58960 192.168.4.10:3306 ESTABLISHED 19081/maxscale
tcp 0 0 192.168.4.100:43508 192.168.4.20:3306 ESTABLISHED 19081/maxscale
tcp6 0 0 :::4006 :::* LISTEN 19081/maxscale
[root@bogon ~]# kill -9 19081 //通过杀进程的方式停止服务步骤二：测试配置
1）在客户端192.168.4.120上使用上边授权用户student 连接代理服务器192.168.4.100:
[root@bogon ~]# mysql -h292.168.4.100 -P4006 -ustudent -p111111
MySQL [(none)]> select @@hostname; //显示当前访问的主机
+----------------+
| @@hostname |
+----------------+
| slave20 | //显示的是从服务器的主机名
+----------------+
Query OK, 0 rows affected (0.00 sec)
MySQL [(none)]> insert into bbsdb.a values(111);//插入新纪录客户端当前访问的是从数据库服务器，仍然能够插入纪录。表示成功。
2 部署集群基础环境
2.1 问题
本案例要求为MySQL集群准备基础环境，完成以下任务操作：
数据库授权
部署MySQL双主多从结构
配置本机hosts解析记录2.2 方案
使用4台RHEL 6虚拟机，如图-1所示。其中192.168.4.10、192.168.4.11作为MySQL双主服务器，192.168.4.12、192.168.4.13作为主服务器的从服务器。
图－1
2.3 步骤
实现此案例需要按照如下步骤进行。
步骤一：准备环境
[root@master1 ~]# cat /etc/hosts
127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4
::1 localhost localhost.localdomain localhost6 localhost6.localdomain6
192.168.4.10 master1 master1.tarena.com
192.168.4.11 master2 master2.tarena.com
192.168.4.12 slave1 slave1.tarena.com
192.168.4.13 slave2 slave2.tarena.com
192.168.4.100 master1 master1.tarena.com
[root@master1 ~]# ping -c 2 master1
PING master1 (192.168.4.10) 56(84) bytes of data.
64 bytes from master1 (192.168.4.10): icmp_seq=1 ttl=64 time=0.378 ms
64 bytes from master1 (192.168.4.10): icmp_seq=2 ttl=64 time=0.396 ms
--- master1 ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 1001ms
rtt min/avg/max/mdev = 0.378/0.387/0.396/0.009 ms
[root@master1 ~]#步骤二：部署数据库主机
1）安装启动数据库（4台数据库主机master1，master2，slave1，slave2执行以下操作）
[root@master1 ~]# tar xvf MySQL-5.6.15-1.el6.x86_64.rpm-bundle.tar //解压软件包
.. ..
[root@master1 ~]# rpm -Uvh MySQL-*.rpm //安装MySQL
.. ..
[root@master1 ~]# service mysql start
Starting MySQL. [确定]2）初始化配置数据库（4台数据库主机master1，master2，slave1，slave2执行以下操作）
[root@master1 ~]# cat /root/.mysql_secret //查看随机生成密码
# The random password set for the root user at Thu May 7 22:15:47 2015 (local time): wW1BNAjD
[root@master1 ~]# mysql -uroot -pwW1BNAjD //使用随机生成密码登陆
Warning: Using a password on the command line interface can be insecure.
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 1
Server version: 5.6.15
Copyright (c) 2000, 2013, 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> set password=password("pwd123"); //修改数据库root密码
Query OK, 0 rows affected (0.49 sec)
mysql> exit
Bye
[root@master1 ~]#步骤三：部署双主多从结构
1）数据库授权（4台数据库主机master1，master2，slave1，slave2执行以下操作）
部署主从同步只需要授权一个主从同步用户即可，但是我们要部署MySQL-MMM架构，所以在这里我们将MySQL-MMM所需用户一并进行授权设置。再授权一个测试用户，在架构搭建完成时测试使用。
[root@master1 ~]# mysql -uroot -ppwd123
Warning: Using a password on the command line interface can be insecure.
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 2
Server version: 5.6.15 MySQL Community Server (GPL)
Copyright (c) 2000, 2013, 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.数据库授权部分为了方便试验我们直接允许所有地址访问了，真实环境需谨慎
mysql> grant replication slave on *.* to slaveuser@"%" identified by "pwd123"; //主从同步授权
Query OK, 0 rows affected (0.00 sec)
mysql> grant replication client on *.* to monitor@"%" identified by "monitor"; //MMM所需架构用户授权
Query OK, 0 rows affected (0.06 sec)
mysql> grant replication client,process,super on *.* to agent@"%" identified by "agent"; //MMM所需架构用户授权
Query OK, 0 rows affected (0.00 sec)
mysql> grant all on *.* to root@"%" identified by "pwd123"; //测试用户授权
Query OK, 0 rows affected (0.00 sec)
mysql>2）开启主数据库binlog日志、设置server_id（master1，master2）
master1设置：
[root@master1 ~]# cat /etc/my.cnf
[mysqld]
datadir=/var/lib/mysql
socket=/var/lib/mysql/mysql.sock
user=mysql
server_id=10 //设置server_id,该值集群中不可以重复
log-bin //开启bin-log日志
# Disabling symbolic-links is recommended to prevent assorted security risks
symbolic-links=0
[mysqld_safe]
log-error=/var/log/mysqld.log
pid-file=/var/run/mysqld/mysqld.pid
[root@master1 ~]# service mysql restart //重启MySQL服务
Shutting down MySQL.. [确定]
Starting MySQL.. [确定]
[root@master1 ~]# ls /var/lib/mysql/master1-bin* //查看binlog日志是否生成
/var/lib/mysql/master1-bin.000001 /var/lib/mysql/master1-bin.index
[root@master1 ~]#master2设置：
[root@master2 ~]# cat /etc/my.cnf
[mysqld]
datadir=/var/lib/mysql
socket=/var/lib/mysql/mysql.sock
user=mysql
server_id=11
log-bin
# Disabling symbolic-links is recommended to prevent assorted security risks
symbolic-links=0
[mysqld_safe]
log-error=/var/log/mysqld.log
pid-file=/var/run/mysqld/mysqld.pid
[root@master2 ~]# service mysql restart
Shutting down MySQL.. [确定]
Starting MySQL. [确定]
[root@master2 ~]# ls /var/lib/mysql/master2-bin.*
/var/lib/mysql/master2-bin.000001 /var/lib/mysql/master2-bin.index3）从库设置server_id
slave1设置：
[root@slave1 ~]# cat /etc/my.cnf
[mysqld]
datadir=/var/lib/mysql
socket=/var/lib/mysql/mysql.sock
user=mysql
server_id=12
# Disabling symbolic-links is recommended to prevent assorted security risks
symbolic-links=0
[mysqld_safe]
log-error=/var/log/mysqld.log
pid-file=/var/run/mysqld/mysqld.pid
[root@slave1 ~]# service mysql restart
Shutting down MySQL.. [确定]
Starting MySQL.. [确定]
[root@slave1 ~]#slave2设置：
[root@slave2 ~]# cat /etc/my.cnf
[mysqld]
datadir=/var/lib/mysql
socket=/var/lib/mysql/mysql.sock
user=mysql
server_id=13
# Disabling symbolic-links is recommended to prevent assorted security risks
symbolic-links=0
[mysqld_safe]
log-error=/var/log/mysqld.log
pid-file=/var/run/mysqld/mysqld.pid
[root@slave2 ~]# service mysql restart
Shutting down MySQL.. [确定]
Starting MySQL. [确定]
[root@slave2 ~]#4）配置主从从从关系
配置master2、slave1、slave2成为master1的从服务器
查看master1服务器binlong日志使用节点信息：
[root@master1 ~]# mysql -uroot -ppwd123
.. ..
mysql> show master status\G
*************************** 1. row ***************************
File: master1-bin.000001
Position: 120
Binlog_Do_DB:
Binlog_Ignore_DB:
Executed_Gtid_Set:
1 row in set (0.00 sec)
mysql>设置master2为master1从：
[root@master2 ~]# mysql -uroot -ppwd123
.. ..
mysql> change master to //设置主服务器信息
-> master_host="192.168.4.10", //设置主服务器IP地址
-> master_user="slaveuser", //设置主从同步用户
-> master_password="pwd123", //设置主从同步密码
-> master_log_file="master1-bin.000001", //设置主库binlog日志名称
-> master_log_pos=120; //设置主从binlog日志使用节点
Query OK, 0 rows affected, 2 warnings (0.06 sec)
mysql> start slave; //启动同步进程
Query OK, 0 rows affected (0.00 sec)
mysql> show slave status\G //查看主从是否成功
.. ..启动同步进程后查看IO节点和SQL节点是否为Yes如果均为Yes表示主从正常。
Slave_IO_Running: Yes //IO节点正常
Slave_SQL_Running: Yes //SQL节点正常
.. ..
mysql>设置slave1为master1从：
[root@slave1 ~]# mysql -uroot -ppwd123
.. ..
mysql> change master to
-> master_host="192.168.4.10",
-> master_user="slaveuser",
-> master_password="pwd123",
-> master_log_file="master1-bin.000001",
-> master_log_pos=120;
Query OK, 0 rows affected, 2 warnings (0.12 sec)
mysql> start slave;
Query OK, 0 rows affected (0.16 sec)
mysql> show slave status\G
.. ..
Slave_IO_Running: Yes //IO节点正常
Slave_SQL_Running: Yes //SQL节点正常
.. ..
mysql>设置slave2为master1从：
[root@slave2 ~]# mysql -uroot -ppwd123
.. ..
mysql> change master to
-> master_host="192.168.4.10",
-> master_user="slaveuser",
-> master_password="pwd123",
-> master_log_file="master1-bin.000001",
-> master_log_pos=120;
Query OK, 0 rows affected, 2 warnings (0.13 sec)
mysql> start slave;
Query OK, 0 rows affected (0.27 sec)
mysql> show slave status\G
.. ..
Slave_IO_Running: Yes //IO节点正常
Slave_SQL_Running: Yes //SQL节点正常
.. ..
mysql>5）配置主主从从关系，将master1配置为master2的从
查看master2的binlog使用信息：
[root@master2 ~]# mysql -uroot -ppwd123
.. ..
mysql> show master status\G
*************************** 1. row ***************************
File: master2-bin.000001
Position: 120
Binlog_Do_DB:
Binlog_Ignore_DB:
Executed_Gtid_Set:
1 row in set (0.00 sec)
mysql>设置master1成为master2的从：
[root@master1 ~]# mysql -uroot -ppwd123
.. ..
mysql> change master to
-> master_host="192.168.4.11",
-> master_user="slaveuser",
-> master_password="pwd123",
-> master_log_file="master2-bin.000001",
-> master_log_pos=120;
Query OK, 0 rows affected, 2 warnings (0.31 sec)
mysql> start slave;
Query OK, 0 rows affected (0.27 sec)
mysql> show slave status\G
.. ..
Slave_IO_Running: Yes //IO节点正常
Slave_SQL_Running: Yes //SQL节点正常
.. ..
mysql>6）测试主从架构是否成功
master1更新数据，查看其它主机是否同步：
[root@master1 ~]# mysql -uroot -ppwd123
.. ..
mysql> show databases;
+--------------------+
| Database |
+--------------------+
| information_schema |
| mysql |
| performance_schema |
| test |
+--------------------+
4 rows in set (0.00 sec)
mysql> create database tarena;
Query OK, 1 row affected (0.06 sec)
mysql> show databases;
+--------------------+
| Database |
+--------------------+
| information_schema |
| mysql |
| performance_schema |
| tarena |
| test |
+--------------------+
5 rows in set (0.00 sec)
mysql>master2主机查看：
[root@master2 ~]# mysql -uroot -ppwd123 -e "show databases"
Warning: Using a password on the command line interface can be insecure.
+--------------------+
| Database |
+--------------------+
| information_schema |
| mysql |
| performance_schema |
| tarena |
| test |
+--------------------+
[root@master2 ~]#slave1主机查看：
[root@slave1 ~]# mysql -uroot -ppwd123 -e "show databases"
Warning: Using a password on the command line interface can be insecure.
+--------------------+
| Database |
+--------------------+
| information_schema |
| mysql |
| performance_schema |
| tarena |
| test |
+--------------------+
[root@slave1 ~]#slave2主机查看：
[root@slave2 ~]# mysql -uroot -ppwd123 -e "show databases"
Warning: Using a password on the command line interface can be insecure.
+--------------------+
| Database |
+--------------------+
| information_schema |
| mysql |
| performance_schema |
| tarena |
| test |
+--------------------+
[root@slave2 ~]#
