数据库---mysql主从复制读写分离
http://m.open-open.com/m/lib/view/1413274853450.html 原理及架构分析
部署前准备
下载好源码包存放位置要与脚本中对应
mysql-5.5.22.tar.gz,cmake-2.8.6.tar.gz,amoeba-mysql-binary-2.2.0.tar.gz,jdk-6u14-linux-x64.bin
selinux和iptables不做设置，关闭
系统光盘镜像为本地yum源，配置好yum文件
环境介绍：
主服务器（master）：192.168.100.155
从服务器（slave1，slave2）：192.168.100.153-154
代理服务器（amoeba）：192.168.100.156
应用客户端（app）：192.168.100.157
1.搭建时间服务器：
主节点上安装ntp时间服务：192.168.100.155
yum -y install ntp
sed -i '/^server/s/^/#/g' /etc/ntp.conf
cat <
server 127.127.1.0
fudge 127.127.1.0 stratum 8
END
/etc/init.d/ntpd restart
netstat -utpln |grep ntp
从节点同步时间：192.168.100.153-154
yum -y install ntpdate
/usr/sbin/ntpdate 192.168.100.155
2.安装mysql：192.168.100.153-155
提示：
[root@localhost ~]# cd bin/
[root@localhost bin]# vi mysql_install.sh
#!/bin/bash
##第一配置yum，安装ncurses依赖包
yum -y install ncurses-*
#解压cmake，安装基础环境
tar zxvf /root/cmake-2.8.6.tar.gz -C /usr/src/
cd /usr/src/cmake-2.8.6
#配置，编译安装cmake
./configure &&gmake &&gmake install
##解压mysql
tar zxvf /root/mysql-5.5.22.tar.gz -C /usr/src/
cd /usr/src/mysql-5.5.22/
#cmake进行配置mysql
cmake -DCMAKE_INSTALL_PREFIX=/usr/local/mysql #指定安装目录\
-DDEFAULT_CHARSET=utf8 #指定字符集为utf8 \
-DDEFAULT_COLLATION=utf8_general_ci ##指定字符校验 \
-DWITH_EXTRA_CHARSETS=all ##支持额外字符集\
-DSYSCONFDIR=/etc/ ##指定配置文件位置
make &&make install #编译安装
if [ -e /usr/local/mysql ];then
echo "mysql install successfully."
fi
:wq
[root@localhost bin]# vi mysql_config.sh
#!/bin/bash
#1.复制配置文件
cp /usr/src/mysql-5.5.22/support-files/my-medium.cnf /etc/my.cnf
#2.添加系统服务
cp /usr/src/mysql-5.5.22/support-files/mysql.server /etc/init.d/mysqld
chmod +x /etc/init.d/mysqld
chkconfig --add mysqld
chkconfig mysqld on
#3.优化PATH路径，执行命令时方便，单引号双引号都行
grep mysql /etc/profile
if [ $? -eq 0 ];then
echo "PATH is set."
else
echo "export PATH=$PATH:/usr/local/mysql/bin" >>/etc/profile
source /etc/profile ##执行文件
fi
#4.初始化mysql，创建用户，赋权
useradd -M -s /sbin/nologin mysql
chown -R mysql:mysql /usr/local/mysql
/usr/local/mysql/scripts/mysql_install_db \
--basedir=/usr/local/mysql \
--datadir=/usr/local/mysql/data --user=mysql
#5.启动mysql，并设置为开机启动
if [ -e /tmp/mysql.sock ];then
/etc/init.d/mysqld restart
else
/etc/init.d/mysqld start
fi
chkconfig mysqld on
#6.修改密码，并提示密码
mysqladmin -u root password '123123' &&echo "mysql root password is 123123"
:wq
3.配置MySQL主从复制：
1）主服务器配置：192.168.100.155
sed -i 's/^log-bin=.*/log-bin=master-bin\nlog-slave-updates=ture/g' /etc/my.cnf
sed -i '/^server-id/s/1/11/g' /etc/my.cnf
/etc/init.d/mysqld restart
mysql -uroot -p123123
mysql> grant replication slave on *.* to 'myslave'@'192.168.100.%' identified by '123123';
mysql> flush privileges;
mysql> show master status; ##记住File的及Position的值，此处为master-bin.000001和337
mysql> create database db_test; ##创建测试数据库
mysql> quit
2）配置从服务器1：192.168.100.153
sed -i '/^server-id/s/1/22/g' /etc/my.cnf
sed -i '/^server-id/arelay-log=relay-log-bin\nrelay-log-index=slave-relay-bin.index' /etc/my.cnf
/etc/init.d/mysqld restart
mysql -uroot -p123123
mysql> change master to master_host='192.168.100.155',master_user='myslave',master_password='123123',master_log_file='master-bin.000001',master_log_pos=337;
mysql> start slave;
mysql> show slave status\G; ##查看无error即可
mysql> show databases; ##验证数据库是否同步
mysql> quit
3）配置从服务器2：192.168.100.154
sed -i '/^server-id/s/1/33/g' /etc/my.cnf
sed -i '/^server-id/arelay-log=relay-log-bin\nrelay-log-index=slave-relay-bin.index' /etc/my.cnf
/etc/init.d/mysqld restart
mysql -uroot -p123123
mysql> change master to master_host='192.168.100.155',master_user='myslave',master_password='123123',master_log_file='master-bin.000001',master_log_pos=337;
mysql> start slave;
mysql> show slave status\G; ##查看无error即可
mysql> show databases; ##验证数据库是否同步
mysql> quit
4.搭建MySQL读写分离：
1）安装软件：192.168.100.156
yum -y remove java
chmod +x jdk-6u14-linux-x64.bin
./jdk-6u14-linux-x64.bin
mv jdk1.6.0_14/ /usr/local/jdk1.6
vi /etc/profile
export JAVA_HOME=/usr/local/jdk1.6
export CLASSPATH=$CLASSPATH:$JAVA_HOME/lib:$JAVA_HOME/jre/lib
export PATH=$JAVA_HOME/lib:$JAVA_HOME/jre/bin/:$PATH:$HOME/bin
export AMOEBA_HOME=/usr/local/amoeba
export PATH=$PATH:$AMOEBA_HOME
:wq
source /etc/profile
java -version
mkdir /usr/local/amoeba
tar zxvf amoeba-mysql-binary-2.2.0.tar.gz -C /usr/local/amoeba/
chmod -R 755 /usr/local/amoeba/
/usr/local/amoeba/bin/amoeba ##验证
2）数据授权给amoeba读写权限：
mysql> grant all on *.* to linuxfan@'192.168.100.%' identified by '123123'; ##在192.168.100.155上完成
mysql> show grants for linuxfan@'192.168.100.%'; ##在192.168.100.153-154上查看是否同步了权限
3）修改配置文件：192.168.100.156
vim /usr/local/amoeba/conf/amoeba.xml
30
31
32
115
116
117
118
:set nu ##显示行号
:wq
vim /usr/local/amoeba/conf/dbServers.xml
25
26
27
28 ##修改
29
44
45
46
47
51
52
53
54
55
56
57
58
59
60
61
62
64
70
:wq
/usr/local/amoeba/bin/amoeba start& ##启动代理服务
netstat -utpln |grep 8066 ##验证
5.测试读写分离
1)验证主从复制：192.168.100.157
yum -y install mysql
mysql -uamoeba -p123456 -h 192.168.100.156 -P 8066 ##登录db集群192.168.100.157
mysql>show databases;
mysql> use db_test;
mysql> create table linuxfan(id int(10),name varchar(10),address varchar(20));
在192.168.100.153-155上查看结果：
mysql -uroot -p123123
mysql> use db_test;
mysql> show tables; ##已然同步
2）关闭slave1，slave2的复制功能：192.168.100.153-154
mysql> stop slave;
3)分别在master，slave1，slave2上创建不同的数据：
master:
mysql> insert into linuxfan values(1,'hehe','this is master');
slave1:
mysql> insert into linuxfan values(2,'hehe','this is slave1');
slave2:
mysql> insert into linuxfan values(3,'hehe','this is slave2');
4）应用客户端验证读：192.168.100.157
mysql> select * from linuxfan; ##第一次查询
+------+------+----------------+
| id | name | address |
+------+------+----------------+
| 2 | hehe | this is slave1 |
+------+------+----------------+
1 row in set (0.02 sec)
mysql> select * from linuxfan; ##第二次查询
+------+------+----------------+
| id | name | address |
+------+------+----------------+
| 3 | hehe | this is slave2 |
+------+------+----------------+
1 row in set (0.01 sec)
mysql> select * from linuxfan; ##第三次查询
+------+------+----------------+
| id | name | address |
+------+------+----------------+
| 2 | hehe | this is slave1 |
+------+------+----------------+
1 row in set (0.00 sec)
5）应用客户端上验证写：
mysql> insert into linuxfan values(4,'hehe','app write test'); ##写入数据
Query OK, 1 row affected (0.02 sec)
mysql> select * from linuxfan; ##查不到刚写入的数据
+------+------+----------------+
| id | name | address |
+------+------+----------------+
| 3 | hehe | this is slave2 |
+------+------+----------------+
1 row in set (0.01 sec)
master上验证：
mysql> select * from linuxfan; ##查到数据
+------+------+----------------+
| id | name | address |
+------+------+----------------+
| 1 | hehe | this is master |
| 4 | hehe | app write test |
+------+------+----------------+
2 rows in set (0.00 sec)
总结：
app写入数据时，amoeba会将数据路由到master上进行存储，app读取数据时，amoeba会将读的请求以轮询的方式发给slaves组（slave1+slave2），实现读写分离。
master和slaves间配置了主从复制，保证了数据的一致性。
主从复制实现高可用 读写分离实现高性能
