Ubuntu搭建Mysql+Keepalived高可用的实现(双主热备)

Mysql5.5双机热备

实现方案

安装两台Mysql

安装Mysql5.5

sudo apt-get update

apt-get install aptitude
aptitude install mysql-server-5.5
或
sudo apt-cache search mariadb-server
apt-get install -y mariadb-server-5.5

卸载

sudo apt-get remove mysql-*
dpkg -l |grep ^rc|awk '{print $2}' |sudo xargs dpkg -P

配置权限

vim /etc/mysql/my.cnf
#bind-address = 127.0.0.1

mysql -u root -p
grant all on *.* to root@'%' identified by 'root' with grant option;
flush privileges;

配置两台Mysql主主同步

配置节点1

vim /etc/mysql/my.cnf

server-id       = 1                                            #节点ID
log_bin         = mysql-bin.log               #日志 
binlog_format   = "ROW"                                    #日志格式
auto_increment_increment = 2                        #自增ID间隔(=节点数，防止ID冲突)
auto_increment_offset  = 1                            #自增ID起始值(节点ID)
binlog_ignore_db=mysql                                    #不同步的数据库
binlog_ignore_db=information_schema
binlog_ignore_db=performance_schema

重启mysql

service mysql restart
mysql -u root -p

记录节点1的binlog日志位置

show master status;
mysql-bin.000001    245        mysql,information_schema,performance_schema

配置节点2

vim /etc/mysql/my.cnf

server-id       = 2
log_bin         = mysql-bin.log                    
relay_log       = mysql-relay-bin.log        #中继日志
log_slave_updates = ON                                  #中继日志执行后，变化计入日志
read_only       = 0
binlog_format   = "ROW"
auto_increment_increment = 2
auto_increment_offset  = 2
binlog_ignore_db=mysql
binlog_ignore_db=information_schema
binlog_ignore_db=performance_schema
replicate_ignore_db=mysql
replicate_ignore_db=information_schema
replicate_ignore_db=performance_schema

配置主从

mysql -u root -p

CHANGE MASTER TO 
       MASTER_HOST='192.168.1.21', 
       MASTER_USER='root', 
       MASTER_PASSWORD='root', 
       MASTER_LOG_FILE='mysql-bin.000001', 
       MASTER_LOG_POS=245;

#开启同步
start slave

#查看同步状态 Slave_IO_Running和Slave_SQL_Running需要均为Yes       
show slave status;  

记录节点2的binlog日志位置

show master status;

mysql-bin.000001    1029        mysql,information_schema,performance_schema

配置主主（节点1）

vim /etc/mysql/my.cnf

relay_log       = mysql-relay-bin.log
log_slave_updates = ON
read_only       = 0
replicate_ignore_db=mysql
replicate_ignore_db=information_schema
replicate_ignore_db=performance_schema

开启同步

mysql -u root -p

CHANGE MASTER TO 
       MASTER_HOST='192.168.1.20', 
       MASTER_USER='root', 
       MASTER_PASSWORD='root', 
       MASTER_LOG_FILE='mysql-bin.000001', 
       MASTER_LOG_POS=1029;

#开启同步
start slave

#查看同步状态 Slave_IO_Running和Slave_SQL_Running需要均为Yes       
show slave status; 

异常处理

Could not initialize master info structure, more error messages can be found in the MySQL error log
解决：reset slave

安装配置Keepalived

安装Keepalived

#依赖
sudo apt-get install -y libssl-dev
sudo apt-get install -y openssl 
sudo apt-get install -y libpopt-dev
sudo apt-get install -y libnl-dev libnl-3-dev libnl-genl-3.dev
apt-get install daemon
apt-get install libc-dev
apt-get install libnfnetlink-dev
apt-get install libnl-genl-3.dev

#安装
apt-get install keepalived

#编译安装
cd /usr/local
wget https://www.keepalived.org/software/keepalived-2.2.2.tar.gz
tar -zxvf keepalived-2.2.2.tar.gz 
mv keepalived-2.2.2 keepalived
./configure --prefix=/usr/local/keepalived
sudo make && make install

#开启日志
sudo vim /etc/rsyslog.d/50-default.conf 

*.=info;*.=notice;*.=warn;\
        auth,authpriv.none;\
        cron,daemon.none;\
        mail,news.none          -/var/log/messages
        
sudo service rsyslog restart 
tail -f /var/log/messages

sudo mkdir /etc/sysconfig
sudo cp /usr/local/keepalived/etc/sysconfig/keepalived /etc/sysconfig/
sudo cp /usr/local/keepalived/etc/rc.d/init.d/keepalived /etc/init.d/
sudo cp /usr/local/keepalived/sbin/keepalived /sbin/
sudo mkdir /etc/keepalived
sudo cp /usr/local/keepalived/etc/keepalived/keepalived.conf /etc/keepalived/

配置节点信息

节点1 192.168.1.21

vim /etc/keepalived/keepalived.conf

global_defs {
   router_id MYSQL_HA　　#当前节点名
}
vrrp_instance VI_1 {    
    state BACKUP         #两台配置节点均为BACKUP
    interface eth0       #绑定虚拟IP的网络接口
    virtual_router_id 51 #VRRP组名，两个节点的设置必须一样，以指明各个节点属于同一VRRP组
    priority 101         #节点的优先级,另一台优先级改低一点
    advert_int 1         #组播信息发送间隔，两个节点设置必须一样
    nopreempt            #不抢占，只在优先级高的机器上设置即可，优先级低的机器不设置
    authentication {      #设置验证信息，两个节点必须一致
        auth_type PASS
        auth_pass 123456
    }
    virtual_ipaddress {   #指定虚拟IP,两个节点设置必须一样
        192.168.1.111
    }
}
virtual_server 192.168.1.111 3306 {   #linux虚拟服务器(LVS)配置 
    delay_loop 2     #每个2秒检查一次real_server状态
    lb_algo wrr      #LVS调度算法,rr|wrr|lc|wlc|lblc|sh|dh
    lb_kind DR      #LVS集群模式 ,NAT|DR|TUN
    persistence_timeout 60    #会话保持时间
    protocol TCP    #使用的协议是TCP还是UDP

    real_server 192.168.1.21 3306 {
        weight 3   #权重
        notify_down  /usr/local/bin/mysql.sh    #检测到服务down后执行的脚本
        TCP_CHECK {
            connect_timeout 10   #连接超时时间
            nb_get_retry 3      #重连次数
            delay_before_retry 3 #重连间隔时间
            connect_port 3306    #健康检查端口
        }
    }    
}

节点2 192.168.1.20

vim /etc/keepalived/keepalived.conf

global_defs {
   router_id MYSQL_HA　　#当前节点名
}
vrrp_instance VI_1 {
    state BACKUP         #两台配置节点均为BACKUP
    interface eth0       #绑定虚拟IP的网络接口
    virtual_router_id 51 #VRRP组名，两个节点的设置必须一样，以指明各个节点属于同一VRRP组
    priority 100         #节点的优先级,另一台优先级改低一点
    advert_int 1         #组播信息发送间隔，两个节点设置必须一样
    nopreempt            #不抢占，只在优先级高的机器上设置即可，优先级低的机器不设置
    authentication {      #设置验证信息，两个节点必须一致
        auth_type PASS
        auth_pass 123456
    }
    virtual_ipaddress {   #指定虚拟IP,两个节点设置必须一样
        192.168.1.111
    }
}
virtual_server 192.168.1.111 3306 {   #linux虚拟服务器(LVS)配置
    delay_loop 2     #每个2秒检查一次real_server状态
    lb_algo wrr      #LVS调度算法,rr|wrr|lc|wlc|lblc|sh|dh
    lb_kind DR      #LVS集群模式 ,NAT|DR|TUN
    persistence_timeout 60    #会话保持时间
    protocol TCP    #使用的协议是TCP还是UDP

    real_server 192.168.1.20 3306 {
        weight 3   #权重
        notify_down  /usr/local/bin/mysql.sh    #检测到服务down后执行的脚本
        TCP_CHECK {
            connect_timeout 10   #连接超时时间
            nb_get_retry 3      #重连次数
            delay_before_retry 3 #重连间隔时间
            connect_port 3306    #健康检查端口
        }
    }
}

编写异常处理脚本

vim /usr/local/bin/mysql.sh

#!/bin/sh
killall keepalived

分配权限

chmod +x /usr/local/bin/mysql.sh
###测试
重启keepalived

service keepalived restart

查看日志

tail -f /var/log/messages

查看虚拟IP

ip addr  #或ip a 或ifconfig

#主节点会有虚拟IP
eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
    link/ether 52:54:9e:17:53:e5 brd ff:ff:ff:ff:ff:ff
    inet 192.168.1.21/24 brd 192.168.1.255 scope global eth0
       valid_lft forever preferred_lft forever
    inet 192.168.1.111/32 scope global eth0
       valid_lft forever preferred_lft forever

关闭主节点的mysql服务

service mysql stop

日志信息

#主节点
Aug 10 15:00:30 i-7jaope92 Keepalived_healthcheckers[4949]: TCP connection to [192.168.1.20]:3306 failed !!!
Aug 10 15:00:30 i-7jaope92 Keepalived_healthcheckers[4949]: Removing service [192.168.1.20]:3306 from VS [192.168.1.111]:3306
Aug 10 15:00:30 i-7jaope92 Keepalived_healthcheckers[4949]: Executing [/usr/local/bin/mysql.sh] for service [192.168.1.20]:3306 in VS [192.168.1.111]:3306
Aug 10 15:00:30 i-7jaope92 Keepalived_healthcheckers[4949]: Lost quorum 1-0=1 > 0 for VS [192.168.1.111]:3306
Aug 10 15:00:30 i-7jaope92 Keepalived_vrrp[4950]: VRRP_Instance(VI_1) sending 0 priority
Aug 10 15:00:30 i-7jaope92 kernel: [100918.976041] IPVS: __ip_vs_del_service: enter

#从节点
Aug 10 15:00:31 i-6gxo6kx7 Keepalived_vrrp[718]: VRRP_Instance(VI_1) Transition to MASTER STATE
Aug 10 15:00:32 i-6gxo6kx7 Keepalived_vrrp[718]: VRRP_Instance(VI_1) Entering MASTER STATE

虚拟IP从主节点漂移到从节点

ip a

eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
    link/ether 52:54:9e:e7:26:5c brd ff:ff:ff:ff:ff:ff
    inet 192.168.1.20/24 brd 192.168.1.255 scope global eth0
       valid_lft forever preferred_lft forever
    inet 192.168.1.111/32 scope global eth0
       valid_lft forever preferred_lft forever

Mysql连接测试

mysql -h 192.168.1.111 -u root -p 

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