keealived安装

依赖

 yum install -y libnl*  yum install -y libnfnetlink-devel zlib zlib-devel gcc gcc-c++ openssl openssl-devel openssh

1.上官网下载 .tar.gz任意版本压缩包

2.上传linux ，解压tar xvf keepalived-1.3.5.tar.gz 3.进入解压目录，./configure --prefix=/usr/local/keepalived  指定安装目录。然后make && make install 4. cp /解压目录/keepalived/etc/init.d/keepalived /etc/init.d/keepalived 赋值执行问脚本到service服务 5.mkdir /etc/keepalived  然后赋值配置文件到指定目录 cp /usr/local/keepalived/etc/keepalived/keepalived.conf /etc/keepalived/keepalived.conf

6.cp /usr/local/keepalived/etc/sysconfig/keepalived /etc/sysconfig/keepalived

7.chkconfig keepalived on 设置开机启动

8.service keepalived start 启动

ps: 使用service keepalived start命令启动服务时， 默认会将/etc/sysconfig/keepalived文件中KEEPALIVED_OPTIONS参数作为keepalived服务启动时的参数， 并从/etc/keepalived/目录下加载keepalived.conf配置文件，或用-f参数指定配置文件的位置。或者修改启动脚本里的 keepalived=/usr/local/keepalived/sbin/keepalived 启动脚本 keepalived_config=/usr/local/keepalived/etc/keepalived/keepalived.conf 配置文件地址 keepalived_pid=/usr/local/keepalived/run/keepalived.pid pid没的说

配置如下：具体含义可以自己查

! Configuration File for keepalived

global_defs {

   #notification_email {    # acassen@firewall.loc    #failover@firewall.loc    #sysadmin@firewall.loc    #} 不需要邮件发送    #notification_email_from Alexandre.Cassen@firewall.loc    #smtp_server 192.168.200.1    #smtp_connect_timeout 30    router_id LVS_DEVEL    #vrrp_skip_check_adv_addr    #vrrp_strict   暂不需要这些参数    #vrrp_garp_interval 0    #vrrp_gna_interval 0 } vrrp_script check_nginx {     script "/etc/keepalived/check_nginx.sh"         ##监控脚本     interval 2                                      ##时间间隔，2秒     weight -10                                        ##权重weight 为正时，脚本检测成功时此weight会加到priority上 ，weight为负时，脚本检测成功时此weight不影响priority，检测失败时priority – abs(weight)     fall 2       rise 1 }

vrrp_instance VI_1 {

    state MASTER     interface em1     mcast_src_ip 192.168.17.32     virtual_router_id 51     priority 100     advert_int 1     authentication {         auth_type PASS         auth_pass 1111     }     track_script {         check_nginx        #监控脚本    }     virtual_ipaddress {         192.168.18.200     } }

备用节点修改mcast_src_ip为自己ip ，priority值小于主节点 99即可，注意跟权重的配合。

修改state=BACKUP

check_nginx.sh 最靠谱的方式应该检查某个url是否返回值

#!/bin/bash # 如果进程中没有nginx则将keepalived进程kill掉 A=`ps -C nginx --no-header |wc -l`      ## 查看是否有 nginx进程 把值赋给变量A  if [ $A -eq 0 ];then                    ## 如果没有进程值得为 零        service keepalived stop          ## 则结束 keepalived 进程 fi

双主模式只需要再建一个vrrp_instance 将slave 变成master master里配置 slave即可。注意ip不能重复。