keepalived 安装与配置
目录keepalived安装与配置... 1
安装：... 1
基本的主备配置... 2
主服务器：... 2
备服务器：... 3
主备重启服务：... 4
查看虚拟IP：... 5
备注：vrrp_script和track_script. 5
备注：notify_6
备注： nopreempt. 6
验证测试：... 6
主服务器停止keepalived ：... 6
备份服务器--虚拟IP切换：... 7
软件卸载... 7
版本历史
时间版本说明编写者
2015-1-91.1keepalived安装与配置csc
系统环境： centos-5.8 64bit
keepalived: keepalived-1.1.15.tar.gz
安装：tar -xvzfkeepalived-1.1.15.tar.gz
cd keepalived-1.1.15
./configuremakemake install
mkdir /etc/keepalivedcp /usr/local/etc/rc.d/init.d/keepalived/etc/rc.d/init.d/cp /usr/local/etc/sysconfig/keepalived/etc/sysconfig/cp /usr/local/etc/keepalived/keepalived.conf/etc/keepalived/cp /usr/local/sbin/keepalived/usr/sbin//etc/init.d/keepalivedstart
ps -ef|grep keepalived
基本的主备配置主服务器： more /etc/keepalived/keepalived.conf! ConfigurationFile for keepalived
#global_defs {# notification_email {## acassen@firewall.loc# failover@firewall.loc# sysadmin@firewall.loc# }# notification_email_fromAlexandre.Cassen@firewall.loc# smtp_server 192.168.200.1# smtp_connect_timeout 30# router_id LVS_DEVEL#}
vrrp_instance VI_1 { state MASTER interface eth0 virtual_router_id 51#主备保持一致 priority 100 #优先级 主比备高 advert_int 1 #心跳广播时间间隔 秒 authentication { auth_type PASS auth_pass 1111 } virtual_ipaddress { 10.8.10.130#虚拟IP，可以有多个 #10.8.10.131 }}
备服务器：# more keepalived.conf! ConfigurationFile for keepalived
#global_defs {# notification_email {# acassen@firewall.loc# failover@firewall.loc# sysadmin@firewall.loc# }# notification_email_fromAlexandre.Cassen@firewall.loc# smtp_server 192.168.200.1# smtp_connect_timeout 30# router_id LVS_DEVEL#}
vrrp_instance VI_1 { state BACkUP interface eth0 virtual_router_id 51 #主备保持一致 priority 90 #优先级 主比备高 advert_int 1 #心跳广播时间间隔 秒 authentication { auth_type PASS auth_pass 1111 } virtual_ipaddress { 10.8.10.130 #虚拟IP，可以有多个 #10.8.10.131
}}
主备重启服务：/etc/init.d/keepalivedrestart
查看虚拟IP：
# ip a1: lo:<LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue link/loopback 00:00:00:00:00:00 brd00:00:00:00:00:00 inet 127.0.0.1/8 scope host lo2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP>mtu 1500 qdisc pfifo_fast qlen 1000 link/ether 00:16:0a:08:0a:79 brdff:ff:ff:ff:ff:ff inet 10.8.10.115/24 brd 10.8.10.255 scopeglobal eth0 inet 10.8.10.130/32 scope global eth0
备注：vrrp_script和track_script
vrrp_script代码块是用来定义监控脚本，脚本执行时间间隔以及脚本的执行结果导致优先级变更幅度的。vrrp_scriptchk_redis {
script "/etc/keepalived/scripts/redis_check.sh"#指定执行脚本的路径
interval 1 #指定脚本的执行时间间隔
weight 10 #脚本结果导致的优先级变更：10表示优先级+10；-10则表示优先级-10
}定义好vrrp_script代码块之后，就可以在instance中使用了track_script{
chk_redis
}注意：VRRP脚本(vrrp_script)和VRRP实例(vrrp_instance)属于同一个级别
备注：notify_notify_stop keepalived停止运行前运行notify_stop指定的脚本。配合官方文档提到的以下三个参数一起使用，功能更强大：notify_master keepalived切换到master时执行的脚本notify_backup keepalived切换到backup时执行的脚本notify_fault keepalived出现故障时执行的脚本
备注： nopreempt 当master down了，backup接管了，master再次起来，不能再成为master。否则master恢复了再接管的话，会造成业务来回切换，这时候就需要nopreempt参数了。nopreempt：设置不抢占，这里只能设置在state为backup的节点上，而且这个节点的优先级必须别另外的高。
以上备注 -参数联合使用方法，可以参考<<keepalive+redis主从自动切换V1.1.docx>>
验证测试：主服务器停止keepalived ：/etc/init.d/keepalivedrestart
# ip a1: lo:<LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue link/loopback 00:00:00:00:00:00 brd00:00:00:00:00:00 inet 127.0.0.1/8 scope host lo2: eth0:<BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast qlen 1000 link/ether 00:16:0a:08:0a:79 brdff:ff:ff:ff:ff:ff inet 10.8.10.115/24 brd 10.8.10.255 scopeglobal eth0
备份服务器--虚拟IP切换：# ip a1: lo:<LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue link/loopback 00:00:00:00:00:00 brd00:00:00:00:00:00 inet 127.0.0.1/8 scope host lo2: eth0:<BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast qlen 1000 link/ether 00:fe:c0:a8:0a:7f brdff:ff:ff:ff:ff:ff inet 10.8.10.128/24 brd 10.8.10.255 scopeglobal eth0 inet 10.8.10.130/32 scope global eth0
当主服务器启动keepalived时候，虚拟IP 重新出现在主服务器
软件卸载 直接make uninstall，然后make clean
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