keepalived+lvs负载均衡

水电工888

　　virtual ip:192.168.0.202
　　load balancer:192.168.0.101
　　backup:192.168.0.201
　　real server1:192.168.0.1
　　real server2:192.168.0.2
　　load balancer的主备机配置:
　　安装:
　　yum install ipvsadm kernel-xen-devel openssl-devel -y
　　wget http://www.keepalived.org/software/keepalived-1.1.20.tar.gz
　　tar xf keepalived-1.1.20.tar.gz
　　cd keepalived-*
　　./configure --prefix=/usr/local/keepalived \
　　--with-kernel-dir=/usr/src/kernels/2.6.18-164.el5xen.i686/
　　make && make install
　　注意编译时需看到以下即为OK。
　　Use IPVS Framework : Yes
　　IPVS sync daemon support : Yes
　　Use VRRP Framework : Yes
　　配置:
　　mkdir /etc/keepalived
　　ln -s /usr/local/keepalived/etc/rc.d/init.d/keepalived /etc/init.d/
　　ln -s /usr/local/keepalived/etc/keepalived/keepalived.conf /etc/keepalived/
　　ln -s /usr/local/keepalived/etc/sysconfig/keepalived /etc/sysconfig/
　　ln -s /usr/local/sbin/keepalived /usr/sbin/
　　vi /etc/keepalived/keepalived.conf
　　=======================================================
　　! Configuration File for keepalived
　　global_defs {
　　notification_email {
　　151000000000@139.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 //on backup change this to: BACKUP
　　interface eth0
　　virtual_router_id 7 //this must keep same with backup
　　priority 150 //主机优先级,备机改为50
　　advert_int 1 //主备间通告间隔秒数
　　authentication { //主备切换时的验证
　　auth_type PASS
　　auth_pass 1111
　　}
　　virtual_ipaddress { //HA 的virtual ip,可多个
　　192.168.0.202
　　}
　　}
　　virtual_server 192.168.0.202 80 {
　　delay_loop 6 //每隔6秒查询real server 状态
　　lb_algo rr //lvs 轮叫调度RR
　　lb_kind DR //lvs负载均衡机制,直连路由
　　persistence_timeout 50 //同一IP的连接50秒内被分配到同一台real server
　　protocol TCP //用TCP协议检查real server 状态
　　real_server 192.168.0.1 80 {
　　weight 1
　　TCP_CHECK {
　　connect_timeout 3
　　nb_get_retry 3 //故障重试秒数
　　delay_before_retry 3 //重试延迟
　　}
　　}
　　real_server 192.168.0.2 80 {
　　weight 1
　　TCP_CHECK {
　　connect_timeout 3
　　nb_get_retry 3
　　delay_before_retry 3
　　}
　　}
　　}
　　========================================================
　　real server配置:
　　vi /etc/sysctl.conf
　　net.ipv4.conf.all.arp_ignore = 1
　　net.ipv4.conf.lo.arp_ignore = 1
　　net.ipv4.conf.all.arp_announce = 2
　　net.ipv4.conf.lo.arp_announce = 2
　　sysctl -p
　　ifconfig eth0:0 192.168.0.202 netmask 255.255.255.255 up
　　route add -host 192.168.0.202 dev eth0:0
　　echo `hostname` > /var/www/html/index.html
　　/etc/init.d/httpd start
　　测试：
　　访问http://192.168.0.202 不断刷新看到在两个real server上切换即OK!
　　ipvsadm -Lnc 查看详细连接情况.
　　原文出处：http://www.xnlinux.cn/thread-1361-1-1.html