安装keepalived
# ./configure --sysconf=/etc --with-kernel-dir=/usr/src/kernels/2.6.32-358.el6.x86_64/ && make && make install #ln -s /usr/local/sbin/keepalived /sbin/ # chkconfig keepalived on
修改网卡配置
# vim /etc/sysconfig/network-scripts/ifcfg-lo:0 DEVICE=lo:0 IPADDR=192.168.1.2 NETMASK=255.255.255.255 # If you're having problems with gated making 127.0.0.0/8 a martian, # you can change this to something else (255.255.255.255, for example) BROADCAST=192.168.1.2 ONBOOT=yes
修改内核文件配置
# vim /etc/sysctl.conf net.ipv4.conf.all.arp_announce = 2 net.ipv4.conf.lo.arp_announce = 2 net.ipv4.conf.all.arp_ignore = 1 net.ipv4.conf.lo.arp_ignore = 1 # sysctl -p
修改keepalived配置文件
# vim /etc/keepalived/keepalived.conf
! Configuration File for keepalived
vrrp_script chk_mysql_port {
script "/var/shell/mysql_check.sh"
interval 2
weight 2
}
global_defs {
notification_email {
445970860@qq.com
}
notification_email_from root@localhost
smtp_server 127.0.0.1
smtp_connect_timeout 30
router_id LVS_DEVEL
}
vrrp_instance VI_1 {
state MASTER （BACKUP备用）
interface eth0
virtual_router_id 51
priority 100 （backup须优先级低于master）
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
track_script {
chk_mysql_port
}
virtual_ipaddress {
192.168.1.2
}
}
virtual_server 192.168.1.2 80 {
delay_loop 6
lb_algo rr
lb_kind DR
nat_mask 255.255.255.0
persistence_timeout 50
protocol TCP
real_server 192.168.1.1 80 {
weight 3
TCP_CHECK {
connect_timeout 3
nb_get_retry 3
delay_before_retry 3
}
}
real_server 192.168.1.3 80 {
weight 3
TCP_CHECK {
connect_timeout 3
nb_get_retry 3
delay_before_retry 3
}
}
}编写脚本（监控mysql，当mysql出现问题不能重新启动时停止nginx服务，keepalived服务会将出现问题的web服务器从集群中剔除出去）
# vim mysql_check.sh #!/bin/bash MYSQL_SLAVE=`ps -C mysqld | grep -v PID | wc -l` if [ $MYSQL_SLAVE -eq 0 ];then /etc/init.d/mysqld restart sleep 3 if [ `ps -C mysqld | grep -v PID | wc -l` -eq 0 ];then pkill -9 nginx fi fi
