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keepalived+LVS搭建高可用负载均衡系统
相关架构设置：
1)vip : 192.168.137.6
2)DS master ip : 192.168.137.8
3)DS backup ip : 192.168.137.9
4)RS 1 ip: 192.168.137.100
5)RS 2 ip: 192.168.137.200
两台RS上的配置脚本：lvsrs
[root@localhost init.d]# cat /etc/init.d/lvsrs#!/bin/shvip=192.168.137.6. /etc/rc.d/init.d/functionscase "$1" instart)ifconfig lo:0 $vip netmask 255.255.255.255 broadcast $viproute add -host $vip dev lo:0echo "1" > /proc/sys/net/ipv4/conf/lo/arp_ignoreecho "2" > /proc/sys/net/ipv4/conf/lo/arp_announceecho "1" > /proc/sys/net/ipv4/conf/all/arp_ignoreecho "2" > /proc/sys/net/ipv4/conf/all/arp_announcesysctl -p > /dev/null 2>&1echo "Real server start ok";;stop)ifconfig lo:0 downroute del $vip >/dev/null 2>&1echo "0" > /proc/sys/net/ipv4/conf/lo/arp_ignoreecho "0" > /proc/sys/net/ipv4/conf/lo/arp_announceecho "0" > /proc/sys/net/ipv4/conf/all/arp_ignoreecho "0" > /proc/sys/net/ipv4/conf/all/arp_announceecho "Real server stoped";;*)echo "Usage: $0 {start|stop}"exit 1esac
DS master上的keepalived的配置文件：
[root@localhost ~]# cat /etc/keepalived/keepalived.confglobal_defs { #notification_email { # acassen@firewall.loc # failover@firewall.loc # sysadmin@firewall.loc #} #notification_email_from Alexandre.Cassen@firewall.loc #smtp_server 192.168.137.1 #smtp_connect_timeout 30 router_id LVS_DS_IP}vrrp_instance VI_1 { state MASTER interface eth0 virtual_router_id 51 priority 100 advert_int 1 authentication { auth_type PASS auth_pass 1111 } virtual_ipaddress { 192.168.137.6 }}virtual_server 192.168.137.6 80 { delay_loop 6 lb_algo wrr lb_kind DR persistence_timeout 0 protocol TCP real_server 192.168.137.100 80 { weight 3 TCP_CHECK { connect_timeout 10 nb_get_retry 3 delay_before_retry 3 connect_port 80 } } real_server 192.168.137.200 80 { weight 3 TCP_CHECK { connect_timeout 10 nb_get_retry 3 delay_before_retry 3 connect_port 80 } }}DS backup上的keepalived的配置文件：
[root@localhost ~]# cat /etc/keepalived/keepalived.confglobal_defs { #notification_email { # acassen@firewall.loc # failover@firewall.loc # sysadmin@firewall.loc #} #notification_email_from Alexandre.Cassen@firewall.loc #smtp_server 192.168.137.1 #smtp_connect_timeout 30 router_id LVS_DS_IP}vrrp_instance VI_1 { state BACKUP interface eth0 virtual_router_id 51 priority 90 advert_int 1 authentication { auth_type PASS auth_pass 1111 } virtual_ipaddress { 192.168.137.6 }}virtual_server 192.168.137.6 80 { delay_loop 6 lb_algo wrr lb_kind DR persistence_timeout 0 protocol TCP real_server 192.168.137.100 80 { weight 3 TCP_CHECK { connect_timeout 10 nb_get_retry 3 delay_before_retry 3 connect_port 80 } } real_server 192.168.137.200 80 { weight 3 TCP_CHECK { connect_timeout 10 nb_get_retry 3 delay_before_retry 3 connect_port 80 } }}启动命令：
service keepalived start | stop
service lvsrs start | stop
查看DS上的keepalived是否配置成功：
tail -f /var/log/message
[root@localhost ~]# tail -f /var/log/messagesFeb 2 16:22:04 localhost Keepalived_healthcheckers[2498]: Activating healthchecker for service [192.168.137.100]:80Feb 2 16:22:04 localhost Keepalived_healthcheckers[2498]: Activating healthchecker for service [192.168.137.200]:80Feb 2 16:22:04 localhost Keepalived_vrrp[2499]: VRRP_Instance(VI_1) Transition to MASTER STATEFeb 2 16:22:04 localhost Keepalived_vrrp[2499]: VRRP_Instance(VI_1) Received lower prio advert, forcing new electionFeb 2 16:22:05 localhost Keepalived_healthcheckers[2498]: TCP connection to [192.168.137.200]:80 failed !!!Feb 2 16:22:05 localhost Keepalived_healthcheckers[2498]: Removing service [192.168.137.200]:80 from VS [192.168.137.6]:80Feb 2 16:22:05 localhost Keepalived_vrrp[2499]: VRRP_Instance(VI_1) Entering MASTER STATEFeb 2 16:22:05 localhost Keepalived_vrrp[2499]: VRRP_Instance(VI_1) setting protocol VIPs.Feb 2 16:22:05 localhost Keepalived_vrrp[2499]: VRRP_Instance(VI_1) Sending gratuitous ARPs on eth0 for 192.168.137.6Feb 2 16:22:05 localhost Keepalived_healthcheckers[2498]: Netlink reflector reports IP 192.168.137.6 addedFeb 2 16:22:10 localhost Keepalived_vrrp[2499]: VRRP_Instance(VI_1) Sending gratuitous ARPs on eth0 for 192.168.137.6
查看分发配置：
[root@localhost ~]# ipvsadmIP Virtual Server version 1.2.1 (size=4096)Prot LocalAddress:Port Scheduler Flags -> RemoteAddress:Port Forward Weight ActiveConn InActConnTCP 192.168.137.6:http wrr -> 192.168.137.100:http Route 3 0 0 -> 192.168.137.200:http Route 3 3 0[root@localhost ~]#
keepalived+LVS搭建高可用负载均衡系统
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