keepalived双机实现高可用和负载均衡

werew

安装keepalived

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# ./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

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# 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

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# 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

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# 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）

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# 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