CentOS 6.3 编译安装HAproxy 1.4.22+keepalived1.2.7

lb5645284

　　1.          安装keepalived所需要的依赖包

yum -y install popt-devel openssl-devel

2.         下载安装keepalived

wget http://www.keepalived.org/software/keepalived-1.2.7.tar.gz tar zxvf keepalived-1.2.7.tar.gz cd keepalived-1.2.7 ./configure   --prefix=/usr/local/keepalived   --with-kernel-dir=/usr/src/kernels/2.6.32-279.el6.i686/ make &&make install

3.         设定keepalived配置文件和启动文件,监控文件

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

vi /etc/keepalived/keepalived.conf vrrp_script chk_http_port { script   "/etc/keepalived/check_haproxy.sh" interval 2 weight 2 global_defs { router_id LVS_DEVEL } vrrp_instance VI_1 { state MASTER           #备机上改为BAKCUP interface eth0 virtual_router_id 51 priority 150             #备机上优先级改为低于150 advert_int 1 authentication { auth_type PASS auth_pass 1111 } track_script { chk_http_port } virtual_ipaddress { 192.168.148.200 } } }

设定监控文件

vi /etc/keepalived/check_haproxy.sh #!/bin/bash A=`ps -C haproxy --no-header |wc -l` if [ $A -eq 0 ];then /etc/init.d/haproxy restart sleep 3 if [ `ps -C haproxy --no-header |wc -l`   -eq 0 ];then /etc/init.d/keepalived stop fi fi

4.         启动keepalived服务并查看虚拟IP

##启动 /etc/init.d/keepalived start ##查看配置文件中的虚拟IP ip add list 2: eth0:    mtu 1500 qdisc pfifo_fast state   UNKNOWN qlen 1000       link/ether 00:0c:29:2b:59:50 brd ff:ff:ff:ff:ff:ff       inet 192.168.148.100/24 brd 192.168.148.255 scope global eth0       inet 192.168.148.200/32 scope global eth0       inet6 fe80::20c:29ff:fe2b:5950/64 scope link          valid_lft forever preferred_lft forever

5.         在备机部署haproxy+keepalived

在主机上打包并复制到备机: tar zcvf haproxy.tgz haproxy/ tar zcvf keepalived.tgz keepalived/ tar zcvfP /etc/keepalived.tgz   /etc/keepalived/ scp /etc/keepalived.tgz test2:/etc/ scp haproxy.tgz keepalived.tgz   test2:/usr/local/ scp /etc/init.d/haproxy   test2:/etc/init.d/ 在备机上解压缩并复制一些启动文件 tar zxvfP keepalived.tgz -C /etc/ tar zxvf keepalived.tgz -C /usr/local/ tar zxvf haproxy.tgz -C /usr/local/ cp   /usr/local/keepalived/etc/rc.d/init.d/keepalived /etc/init.d/keepalived cp   /usr/local/keepalived/etc/sysconfig/keepalived /etc/sysconfig/ cp /usr/local/keepalived/sbin/keepalived   /sbin/

6.         在备机修改keepalived配置文件并启动

vi /etc/keepalived/keepalived.conf state BACKUP           #备机上改为BAKCUP priority 120           #备机上优先级改为120 /etc/init.d/keepalived start (由于存在check_haproxy.sh,haproxy会自动启动)

7.         查看主备机器的VRRP通信状态是否正常

查看var/log/messages,如果看到都是MASTER STATUS，或者ip add list都可以看到VIP，基本上可以说明VRRP通信有问题， Nov    6 10:28:10 test1 Keepalived_vrrp[7941]: VRRP_Instance(VI_1) setting   protocol VIPs. Nov    6 10:28:10 test1 Keepalived_vrrp[7941]: VRRP_Instance(VI_1) Entering   MASTER STATE Nov    6 10:28:09 test1 Keepalived_vrrp[7941]: VRRP_Instance(VI_1) Transition   to MASTER STATE 可以用tcpdump –ni eth0 vrrp,看到主备2台服务器都在发VRRP包，正常情况下只有MASTER发送VRRP [root@test1 local]# tcpdump -nni eth0   vrrp tcpdump: verbose output suppressed, use   -v or -vv for full protocol decode listening on eth0, link-type EN10MB   (Ethernet), capture size 65535 bytes 10:30:13.455292 IP 192.168.148.100 >   224.0.0.18: VRRPv2, Advertisement, vrid 51, prio 152, authtype simple, intvl   1s, length 20 10:30:14.456310 IP 192.168.148.100 >   224.0.0.18: VRRPv2, Advertisement, vrid 51, prio 152, authtype simple, intvl   1s, length 20 10:30:15.457330 IP 192.168.148.100 >   224.0.0.18: VRRPv2, Advertisement, vrid 51, prio 152, authtype simple, intvl   1s, length 20 检查iptables防火墙，需要在2台服务器上都加入以下2条： MASTER: -A INPUT -s 192.168.148.110 -j ACCEPT BACKUP: -A INPUT -s 192.168.148.100 -j ACCEPT

8.         进行主备机的HA切换测试

在MASTER上停止keepalived服务 /etc/init.d/keepalived stop 查看BAKCUP /var/log/messages,是否切换到MASTER Nov    6 10:37:27 test2 Keepalived_vrrp[3824]: VRRP_Instance(VI_1) Sending   gratuitous ARPs on eth1 for 192.168.148.200 Nov    6 10:37:22 test2 Keepalived_healthcheckers[3823]: Netlink reflector   reports IP 192.168.148.200 added Nov    6 10:37:22 test2 Keepalived_vrrp[3824]: VRRP_Instance(VI_1) Sending   gratuitous ARPs on eth1 for 192.168.148.200 Nov    6 10:37:22 test2 Keepalived_vrrp[3824]: VRRP_Instance(VI_1) setting   protocol VIPs. Nov    6 10:37:22 test2 Keepalived_vrrp[3824]: VRRP_Instance(VI_1) Entering   MASTER STATE Nov    6 10:37:21 test2 Keepalived_vrrp[3824]: VRRP_Instance(VI_1) Transition   to MASTER STATE 查看虚拟IP是否启动 ip add list 2: eth1:    mtu 1500 qdisc pfifo_fast state   UNKNOWN qlen 1000       link/ether 00:0c:29:a6:8a:61 brd ff:ff:ff:ff:ff:ff       inet 192.168.148.110/24 brd 192.168.148.255 scope global eth1     inet 192.168.148.200/32   scope global eth1       inet6 fe80::20c:29ff:fea6:8a61/64 scope link          valid_lft forever preferred_lft forever 以上说明切换正常，HAproxy可以在备机正常使用 由于keepalived默认是抢占模式，MASTER恢复后会进行再次切换,可以在配置文件里设置 nopreempt 来禁用这个功能

参考资料
http://www.cnblogs.com/dkblog/archive/2011/07/06/2098949.html