LVS+Keepalived+Mysql+主备数据库架构[4台]

 这是一个坑...磨了不少时间。见证自己功力有待提升。。。

架构图

 

数据库

1.安装数据库

这块不难， 直接引用： mysql安装

2.数据库主备

这块不难， 直接引用： mysql主备

虚拟VIP

重点来了！！

上脚本， 把这个脚本命名后仍进/etc/init.d， 然后授予权限755或者+x

SNS_VIP=192.168.158.110
/etc/rc.d/init.d/functions
case "$1" in
start)
       ifconfig eth0:0 $SNS_VIP netmask 255.255.255.255 broadcast $SNS_VIP
       /sbin/route add -host $SNS_VIP dev eth0:0
       echo "1" >/proc/sys/net/ipv4/conf/lo/arp_ignore
       echo "2" >/proc/sys/net/ipv4/conf/lo/arp_announce
       echo "1" >/proc/sys/net/ipv4/conf/all/arp_ignore
       echo "2" >/proc/sys/net/ipv4/conf/all/arp_announce
       sysctl -p >/dev/null 2>&1
       echo "RealServer Start OK"
       ;;
stop)
       ifconfig eth0:0 down
       route del $SNS_VIP >/dev/null 2>&1
       echo "0" >/proc/sys/net/ipv4/conf/lo/arp_ignore
       echo "0" >/proc/sys/net/ipv4/conf/lo/arp_announce
       echo "0" >/proc/sys/net/ipv4/conf/all/arp_ignore
       echo "0" >/proc/sys/net/ipv4/conf/all/arp_announce
       echo "RealServer Stoped"
       ;;
*)
       echo "Usage: $0 {start|stop}"
       exit 1
esac
exit 0

启动这个脚本后会出现虚拟ip， 启动方法service realserver start

查看有好几种方式

第一种: ifconfig

第二种: ip addr

第三种: ifconfig eth0:0

好了, 虚拟ip也有了,记得两台mysql是一样的操作。

LVS

重点！

1.依赖：

yum install -y libnl* popt*

rpm -ivh popt-static-1.13-7.el6.x86_64.rpm

第二个是后面发现缺少, 恰恰yum中也没有的安装而独自下载rpm
包

2.查看是否已加载lvs模块

modprobe -l |grep ipvs

3.正常的情况下是这样的:

[root@localhost init.d]# modprobe -l |grep ipvs
kernel/net/netfilter/ipvs/ip_vs.ko
kernel/net/netfilter/ipvs/ip_vs_rr.ko
kernel/net/netfilter/ipvs/ip_vs_wrr.ko
kernel/net/netfilter/ipvs/ip_vs_lc.ko
kernel/net/netfilter/ipvs/ip_vs_wlc.ko
kernel/net/netfilter/ipvs/ip_vs_lblc.ko
kernel/net/netfilter/ipvs/ip_vs_lblcr.ko
kernel/net/netfilter/ipvs/ip_vs_dh.ko
kernel/net/netfilter/ipvs/ip_vs_sh.ko
kernel/net/netfilter/ipvs/ip_vs_sed.ko
kernel/net/netfilter/ipvs/ip_vs_nq.ko
kernel/net/netfilter/ipvs/ip_vs_ftp.ko
[root@localhost init.d]# 

4.安装正包

tar -zxvf ipvsadm-1.26.tar.gz

make && make install

5.编译安装完成后测试:

ipvsadm -L -n

[root@localhost init.d]# ipvsadm -ln
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
  -> RemoteAddress:Port           Forward Weight ActiveConn InActConn

lvs大功告成!

Keepalived

重点!!

1.安装依赖

yum install -y kernel-devel openssl openssl-devel

2.编译安装

新建安装目录

mkdir -p /usr/local/keepalived

编译

./configure --prefix=/usr/local/keepalived --with-kernel-dir=/usr/src/kernels/2.6.32-358.el6.x86_64/

Keepalived configuration
------------------------
Keepalived version       : 1.2.13
Compiler                 : gcc
Compiler flags           : -g -O2
Extra Lib                : -lssl -lcrypto -lcrypt 
Use IPVS Framework       : Yes
IPVS sync daemon support : Yes
IPVS use libnl           : No
fwmark socket support    : Yes
Use VRRP Framework       : Yes
Use VRRP VMAC            : Yes
SNMP support             : No
SHA1 support             : No
Use Debug flags          : No

注意: 这里的2.6.32-358.el6.x86_64是您的内核, 不要照抄哦, 可能咋们内核不一致

安装

make && make install

3.其他操作

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

chkconfig keepalived on

 LVS+Keepalived配置

~~负载均衡主机~~

1.新建keepalived配置文件:

vim /etc/keepalived/keepalived.conf

2.keepalived.conf详细:

! Configuration File for keepalived

global_defs {                           #全局标识模块
   notification_email {         #定义邮件通知
     test@163.com                       #目标邮箱
   }
   notification_email_from test@163.com #发送邮箱
   smtp_server 127.0.0.1        #发送邮箱的smtp服务器
   smtp_connect_timeout 30      #smtp服务器连接超时时间
   router_id LVS_DEVEL
}

vrrp_instance VI_1 {
    state MASTER                        #本实例启动状态：MASTER/BACKUP
    interface eth0                      #监控的网络接口
    virtual_router_id 51        #vrrp实例（同一个组主备服务器设置一样）
    priority 100                        #优先级高的为master，不能超过255。（BACKUP可设置为50）
    advert_int 1                        #均衡器检测间隔1秒（服务器设置都一样）
    authentication {            #验证类型及密码（服务器设置都一样）
        auth_type PASS          #认证方式，PASS或AH
        auth_pass 123456        #认证密码
    }
    virtual_ipaddress {         #虚拟ip地址virtual_ipaddress,可以定义多个
        192.168.158.110
    }
}

virtual_server 192.168.158.110 3306 {   #定义虚拟服务器，与上面的virtual_server一样
    delay_loop 3                        #健康检查时间间隔，6秒
    lb_algo wrr                         #负载均衡调度算法：rr|wrr|lc|wlc|sh|dh|lblc
    lb_kind DR                          #负载均衡转发规则：NAT|DR|TUN
    nat_mask 255.255.255.0
    #persistence_timeout 50     #回话保持时间50秒，动态服务建议开启
    protocol TCP                        #转发协议protocol，一般有tcp和udp两种

        #后端真实服务器，有几台就设置几个
    real_server 192.168.158.134 3306 {
        weight 1                        #权重越大负载分越大，0表示失效
        SSL_GET {                       #健康检查方式：HTTP_GET|SSL_GET|TCP_CHECK|SMTP_CHECK|MISC_CHECK
            connect_timeout 3
            nb_get_retry 3
            delay_before_retry 3
            connect_port 3306
        }
    }
    real_server 192.168.158.139 3306 {
        weight 1
        SSL_GET {
            connect_timeout 3
            nb_get_retry 3
            delay_before_retry 3
            connect_port 3306
        }
    }
}　

3.附上启动脚本

#!/bin/sh
#
# Startup script for the Keepalived daemon
#
# processname: keepalived
# pidfile: /var/run/keepalived.pid
# config: /etc/keepalived/keepalived.conf
# chkconfig: - 21 79
# description: Start and stop Keepalived

# Source function library
. /etc/rc.d/init.d/functions

# Source configuration file (we set KEEPALIVED_OPTIONS there)
. /etc/sysconfig/keepalived

RETVAL=0

prog="keepalived"

start() {
    echo -n $"Starting $prog: "
    daemon keepalived ${KEEPALIVED_OPTIONS}
    RETVAL=$?
    echo
    [ $RETVAL -eq 0 ] && touch /var/lock/subsys/$prog
}

stop() {
    echo -n $"Stopping $prog: "
    killproc keepalived
    RETVAL=$?
    echo
    [ $RETVAL -eq 0 ] && rm -f /var/lock/subsys/$prog
}

reload() {
    echo -n $"Reloading $prog: "
    killproc keepalived -1
    RETVAL=$?
    echo
}

# See how we were called.
case "$1" in
    start)
        start
        ;;
    stop)
        stop
        ;;
    reload)
        reload
        ;;
    restart)
        stop
        start
        ;;
    condrestart)
        if [ -f /var/lock/subsys/$prog ]; then
            stop
            start
        fi
        ;;
    status)
        status keepalived
        RETVAL=$?
        ;;
    *)
        echo "Usage: $0 {start|stop|reload|restart|condrestart|status}"
        RETVAL=1
esac

exit $RETVAL

4.检测keepalived

service keepalived start

service keepalived stop

service keepalived status

5.检测lvs

ipvsadm

lvs数据参考:

[root@localhost init.d]# ipvsadm
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
  -> RemoteAddress:Port           Forward Weight ActiveConn InActConn
TCP  192.168.158.110:mysql wrr
  -> 192.168.158.134:mysql        Route   1      0          0         
  -> 192.168.158.139:mysql        Route   1      0          0         

 ~~负载均衡备机~~

备机负载服务器与主负载服务器大致相同，只是在keepalived的配置文件中需要改以下两处：

（1）将state由MASTER改为BACKUP

（2）将priority由100改为99

lvs+keepalived大功告成!!

验证性测试

1.启动mysql(两台)

service mysqld start

2.启动vip

service realserver start

3.启动keepalived(两台)

service keepalived start

4.使用本地ping vip

5.使用本地连接mysql(连接的是vip)

mysql.exe -u root -p"lizhenghua" -P 3306 -h 192.168.158.110

6.在从库139上建立数据库cheng(先断开主从)

192.168.158.139

 192.168.158.134

 

笔记

! Configuration File for keepalived

global_defs {
   notification_email {
     test@163.com
   }
   notification_email_from test@163.com
   smtp_server 127.0.0.1
   smtp_connect_timeout 30
   router_id LVS_1
}

vrrp_instance VI_1 {
    state MASTER
    interface eth0
    virtual_router_id 51
    priority 100
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 123456
    }
    virtual_ipaddress {
        192.168.158.110
    }
}

virtual_server 192.168.158.110 3306 {
    delay_loop 3
    lb_algo wrr
    lb_kind DR
    nat_mask 255.255.255.0
    #persistence_timeout 50
    protocol TCP

    real_server 192.168.158.134 3306 {
        weight 1
        SSL_GET {
            connect_timeout 3
            nb_get_retry 3
            delay_before_retry 3
            connect_port 3306
        }
    }
    real_server 192.168.158.139 3306 {
        weight 1
        SSL_GET {
            connect_timeout 3
            nb_get_retry 3
            delay_before_retry 3
            connect_port 3306
        }
    }
}

监测脑裂　

#!/bin/bash
# 检查脑裂的脚本，在备节点上进行部署
LB01_VIP=192.168.158.110
LB01_IP=192.168.158.140
LB02_IP=192.168.158.141
while true
do
  ping -c 2 -W 3 $LB01_VIP &>/dev/null
    if [ $? -eq 0 -a `ip add|grep "$LB01_VIP"|wc -l` -eq 1 ];then
        echo "ha is brain."
    else
        echo "ha is ok"
    fi
    sleep 5
done　

 完成!!