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一、初始环境部署 两台centos 6.3 均最小欢安装，初始化系统环境 主机配置 master： 192.168.0.250 24 backup： 192.168.0.249 24 vip ： 192.168.0.66 24 测试端： 192.168.0.252 24 在两台主上均以下操作，配置本地yum源 cd /etc/yum.repos.d/ mv CentOS-Base.repo CentOS-Debuginfo.repo CentOS-Vault.repo /root/ vi CentOS-Media.repo [c6-media] name=CentOS-$releasever - Media baseurl=file:///mnt/ file:///media/cdrom/ file:///media/cdrecorder/ gpgcheck=0 enabled=1 mount /dev/cdrom /mnt/ 安装基本编译工具，以及其他工具包
yum -y install make gcc openssl-devel yum -y install lrzsz ipvsadm sendmail httpd 二、安装lVS 和 keepalived 软件包 查看内核是否支持lvs modprobe -l |grep ipvs kernel/net/netfilter/ipvs/ip_vs.ko kernel/net/netfilter/ipvs/ip_vs_rr.ko kernel/net/netfilter/ipvs/ip_vs_wrr.ko kernel/net/netfilter/ipvs/ip_vs_lc.ko kernel/net/netfilter/ipvs/ip_vs_wlc.ko kernel/net/netfilter/ipvs/ip_vs_lblc.ko kernel/net/netfilter/ipvs/ip_vs_lblcr.ko kernel/net/netfilter/ipvs/ip_vs_dh.ko kernel/net/netfilter/ipvs/ip_vs_sh.ko kernel/net/netfilter/ipvs/ip_vs_sed.ko kernel/net/netfilter/ipvs/ip_vs_nq.ko kernel/net/netfilter/ipvs/ip_vs_ftp.ko 出现以上信息表示支持，kernel2.6 以后支持 在www.keepalived.org 下载keepalived-1.2.15.tar.gz tar -zxvf keepalived-1.2.15.tar.gz cd keepalived-1.2.15 ./configure --sysconf=/etc --with-kernel-dir=/usr/src/kernels/2.6.32-279.el6.x86_64 make && make install ln -s /usr/local/sbin/keepalived /sbin/ (将keepalived指向/sbin/) vi /etc/keepalived/keepalived.conf
! Configuration File for keepalived
global_defs { notification_email { 18792525964@139.com （这里是发送报警邮件地址） acassen@firewall.loc failover@firewall.loc sysadmin@firewall.loc } notification_email_from Alexandre.Cassen@firewall.loc smtp_server 192.168.0.250（这是右键服务器地址） smtp_connect_timeout 30 （连接smtp服务超时时间） router_id LVS_DEVEL }
vrrp_instance VI_1 { state MASTER （制定服务器角色） interface eth0 virtual_router_id 51 （虚拟路由id，一个集群id必须一样） priority 100 （角色优先级，数值越大优先级越高） advert_int 1 （master与backup同步检查的时间间隔，单位秒） authentication { auth_type PASS （验证类型，有PASS和AH） auth_pass 1111 （验证密钥，两台机器必须一致） } virtual_ipaddress { 192.168.0.66 （虚拟IP地址） } }
virtual_server 192.168.0.66 80 { delay_loop 6 （运行情况检查时间间隔） lb_algo rr （设置负载调度算法） lb_kind DR （负载均衡机制，设置DR，还有NAT和TUN模式） nat_mask 255.255.255.0 persistence_timeout 50 protocol TCP （设置传输协议为TCP）
real_server 192.168.0.250 80 { weight 1 （服务器权值设置） TCP_CHECK { connect_timeout 3 （表示3秒无响应超市） nb_get_retry 3 （重试次数3次） delay_before_retry 3（重试时间间隔3秒） } }
real_server 192.168.0.249 80 { weight 1 TCP_CHECK { connect_timeout 3 nb_get_retry 3 delay_before_retry 3 } }
} 在master主机上配置如上，在backup主机祝需要修改 state BACKUP priority 90 vi /etc/init.d/lvsrs (编写realserver启动脚本)
#!/bin/bash NS_VIP=192.168.0.66
/etc/rc.d/init.d/functions
case "$1" in start) /sbin/ifconfig lo:0 $SNS_VIP netmask 255.255.255.255 broadcast $SNS_VIP up /sbin/route add -host $SNS_VIP dev lo:0 echo "1" > /proc/sys/net/ipv4/conf/lo/arp_ignore echo "2" > /proc/sys/net/ipv4/conf/lo/arp_announce echo "1" > /proc/sys/net/ipv4/conf/all/arp_ignore echo "2" > /proc/sys/net/ipv4/conf/all/arp_announce syscty -p > /dev/null 2>&1 echo "RealServer Start Ok" ;; stop) ifconfig lo:0 down route del $SNS_VIP >/dev/null 2>&1 echo "0" > /proc/sys/net/ipv4/conf/lo/arp_ignore echo "0" > /proc/sys/net/ipv4/conf/lo/arp_announce echo "0" > /proc/sys/net/ipv4/conf/all/arp_ignore echo "0" > /proc/sys/net/ipv4/conf/all/arp_announce echo "RealServer Stoped" ;; *) echo "Usage: $0 {start|stop}" exit 1 esac exit 0
chmod 755 /etc/init.d/lvsrs /etc/init.d/keepalived start /etc/init.d/lvsrs start 三、测试配置正确 在master上执行 echo "This is master" > /var/www/html/index.html service httpd start 在backup上执行 echo "This is backup" > /var/www/html/index.html service httpd start 两台机器均关闭防火墙 service iptables stop 在测试端浏览器输入http://192.168.0.66
接着停掉master上的httpd服务 service httpd stop
我们可看到已经切换到backup服务器，检查backup的日志 tail -f /var/log/messages
Mar 12 03:35:22 backup Keepalived_healthcheckers[3123]: Removing service [192.168.0.249]:80 from VS [192.168.0.66]:80 Mar 12 03:35:22 backup Keepalived_healthcheckers[3123]: SMTP connection ERROR to [192.168.0.250]:25. Mar 12 03:39:46 backup Keepalived_healthcheckers[3123]: TCP connection to [192.168.0.249]:80 success. Mar 12 03:39:46 backup Keepalived_healthcheckers[3123]: Adding service [192.168.0.249]:80 to VS [192.168.0.66]:80 Mar 12 03:39:46 backup Keepalived_healthcheckers[3123]: Remote SMTP server [192.168.0.250]:25 connected. Mar 12 03:39:46 backup Keepalived_healthcheckers[3123]: Error reading data from remote SMTP server [192.168.0.250]:25. Mar 12 03:39:55 backup Keepalived_healthcheckers[3123]: TCP connection to [192.168.0.250]:80 failed !!! Mar 12 03:39:55 backup Keepalived_healthcheckers[3123]: Removing service [192.168.0.250]:80 from VS [192.168.0.66]:80 Mar 12 03:39:55 backup Keepalived_healthcheckers[3123]: Remote SMTP server [192.168.0.250]:25 connected. Mar 12 03:39:55 backup Keepalived_healthcheckers[3123]: Error reading data from remote SMTP server [192.168.0.250]:25. 注意：这里master宕机backup接管，master恢复backup依然提供服务，当backup宕机master才会接管服务！不是master恢复 服务又从backup切回master！ 双机热备功能已实现，你会了吗？
本文出自 “技术成就未来” 博客，请务必保留此出处http://linuxmysqldba.blog.51cto.com/2530817/1619681 (责任编辑：IT) |
