MySQL MHA配置详解

MySQL环境：

master：192.168.202.129:3306

slave：192.168.202.129:3307，192.168.202.129:3307，192.168.202.130:3306，192.168.202.130:3307，192.168.202.130:3308

MariaDB-10.0.13

MHA环境：

manager：192.168.202.129

node：192.168.202.130(3306端口监听的实例作为备用主库)，192.168.202.129

下载地址：http://code.google.com/p/mysql-master-ha/ （这个需要FQ），

也可以在安科网的资源站里下载：

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具体下载目录在 /2015年资料/2月/10日/MySQL MHA配置详解/

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一 MySQL安装准备：

1 建立MySQL安装目录：mkdir -p /usr/local/mysql

2 建立mysql用户：

groupadd mysql
useradd -g mysql mysql

3 下载依赖包：

yum install make apr* autoconf automake curl curl-devel gcc gcc-c++ gtk+-devel zlib-devel openssl openssl-devel pcre-devel gd kernel keyutils patch perl kernel-headers compat* cpp glibc libgomp libstdc++-devel keyutils-libs-devel libsepol-devel libselinux-devel krb5-devel libXpm* freetype freetype-devel freetype* fontconfig fontconfig-devel libjpeg* libpng* php-common php-gd gettext gettext-devel ncurses* libtool* libxml2 libxml2-devel patch policycoreutils bison

4 下载cmake：yum install cmake -y

5 开始编译：

cmake . -DCMAKE_INSTALL_PREFIX=/usr/local/mysql -DMYSQL_DATADIR=/home/mysql/data -DDEFAULT_CHARSET=utf8 -DDEFAULT_COLLATION=utf8_general_ci -DEXTRA_CHARSETS=all -DENABLED_LOCAL_INFILE=1

6 结束之后，输入下面的命令：make && make install

上面的过程结束之后就安装好了MySQL。下面是配置过程：

二编译安装MySQL：

1 修改环境变量：vi /etc/profile，添加下面的语句：

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

2 source /etc/profile加载环境变量

3 将/usr/local/mysql/support_files下的my-default.cnf复制到/etc下：cp /usr/local/mysql/support_files/my-default.cnf /etc/my.cnf，修改这个文件加入下面的内容：

[mysqld_multi]
mysqld = /usr/local/mysql/bin/mysqld_safe
mysqladmin = /usr/local/mysql/bin/mysqladmin
log = /home/mysql/mydata/log/mysqld_multi.log

[mysqld1]
socket = /home/mysql/mydata/data1/socket/mysqld.sock
port = 3306
pid-file = /home/mysql/mydata/data1/mysqld.pid
datadir = /home/mysql/mydata/data1

log_bin=/home/mysql/mydata/data1/binlog/mysql-bin
server-id = 1

[mysqld2]
socket = /home/mysql/mydata/data2/socket/mysqld.sock
port = 3307
pid-file = /home/mysql/mydata/data2/mysqld.pid
datadir = /home/mysql/mydata/data2

log_bin=/home/mysql/mydata/data2/binlog/mysql-bin
server-id = 2
relay_log = /home/mysql/mydata/data2/relay_log/mysql-relay-bin
log_slave_updates = 1
read_only = 1

[mysqld3]
socket = /home/mysql/mydata/data3/socket/mysqld.sock
port = 3308
pid-file = /home/mysql/mydata/data3/mysqld.pid
datadir = /home/mysql/mydata/data3

log_bin=/home/mysql/mydata/data3/binlog/mysql-bin
server-id = 3
relay_log = /home/mysql/mydata/data3/relay_log/mysql-relay-bin
log_slave_updates = 1
read_only = 1

上面的路径都需要用mysql用户建立，这里不再赘述。

4 下面就可以初始化数据库了：

/usr/local/mysql/scripts/mysql_install_db --user=mysql --basedir=/usr/local/mysql --datadir=/home/mysql/mydata/data1

/usr/local/mysql/scripts/mysql_install_db --user=mysql --basedir=/usr/local/mysql --datadir=/home/mysql/mydata/data2

/usr/local/mysql/scripts/mysql_install_db --user=mysql --basedir=/usr/local/mysql --datadir=/home/mysql/mydata/data3

这样就把一个服务器上所有的数据库都建立好了，在130服务器上也是如法炮制，不过在修改my.cnf的时候要注意一点就是修改server-id，从4以后开始，不要和129服务器的相同。

下面就可以启动数据库了，命令很简单：

mysqld_multi --defaults-extra-file=/etc/my.cnf start 1,2,3

这就将三个数据库启动好了，可以用下面的语句检查：

mysqld_multi --defaults-extra-file=/etc/my.cnf report

MySQL server from group: mysqld1 is running
MySQL server from group: mysqld2 is running
MySQL server from group: mysqld3 is running

三主从配置

1 主库建立复制用户：

在192.168.202.129上：
$mysql -uroot -P3306 -p127.0.0.1

grant replication slave, replication client on *.* to repl@'192.168.202.%' identified by 'repl'; -- 这里限制在局域网内

2 从库配置：

在192.168.202.129上：
$mysql -uroot -P3307 -p127.0.0.1
change master to master_host='192.168.202.129', MASTER_PORT=3306, master_user='repl', master_password='repl', master_log_file='mysql-bin.000001', master_log_pos=0;
start slave;

$mysql -uroot -P3308 -p127.0.0.1
change master to master_host='192.168.202.129', MASTER_PORT=3306, master_user='repl', master_password='repl', master_log_file='mysql-bin.000001', master_log_pos=0;
start slave;
在192.168.202.130上：
$mysql -uroot -P3306 -p127.0.0.1
change master to master_host='192.168.202.129', MASTER_PORT=3306, master_user='repl', master_password='repl', master_log_file='mysql-bin.000001', master_log_pos=0;
start slave;
$mysql -uroot -P3307 -p127.0.0.1
change master to master_host='192.168.202.129', MASTER_PORT=3306, master_user='repl', master_password='repl', master_log_file='mysql-bin.000001', master_log_pos=0;
start slave;
$mysql -uroot -P3308 -p127.0.0.1
change master to master_host='192.168.202.129', MASTER_PORT=3306, master_user='repl', master_password='repl', master_log_file='mysql-bin.000001', master_log_pos=0;
start slave;

这样子就配置结束了。

3 配置好了以后主库上会有slave过来的进程：

mysql>show processlist;

MySQL MHA配置详解

有几个slave，这里就会有多少个进程。

# ln -s /usr/local/mysql/bin/mysqlbinlog /usr/bin/mysqlbinlog
# ln -s /usr/local/mysql/bin/mysql /usr/bin/mysql

MySQL MHA配置详解

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