KeepAlived+Nginx 安装

yum install -y gcc gcc-c++ openssl openssl-devel

目前keepalived最新版本下载：
[root@rhel ~]#wget -c http://www.keepalived.org/software/keepalived-1.2.12.tar.gz
[root@rhel ~]# tar zxvf keepalived-1.2.12.tar.gz
[root@rhel ~]# cd keepalived-1.2.12
安装编译环境：
[root@rhel ~]# yum install -y gcc gcc-c++ openssl openssl-devel
1

//指定安装路径
[root@rhel keepalived-1.2.12]# ./configure --prefix=/usr/local/keepalived --sysconf=/etc

[root@rhel keepalived-1.2.12]# make && make install //安装
将keepalived命令软连接到/usr/bin下
[root@rhel keepalived-1.2.12]# ln -s /usr/local/keepalived/sbin/keepalived /usr/bin/keepalived

添加启动脚本且方便用service keepalived start/stop/restart管理(如果没有init.d/keepalived则从源码目录拷贝)
[root@rhel keepalived-1.2.12]# cp /keepalived/keepalived-2.0.8/keepalived/etc/init.d/keepalived /etc/init.d/keepalived
[root@rhel keepalived-1.2.12]# chmod 755 /etc/init.d/keepalived //添加执行权限
[root@rhel keepalived-1.2.12]# chkconfig keepalived on //开机启动

修改/etc/init.d/keepalived中的程序路径
# Source configuration file (we set KEEPALIVED_OPTIONS there)
. /etc/sysconfig/keepalived

改为：
# Source configuration file (we set KEEPALIVED_OPTIONS there)
. /keepalived/keepalived-2.0.8/keepalived/etc/sysconfig/keepalived

默认情况下，keepalived 会读取 /etc/keepalived 下keepalived.conf 文件
如果没有建立这个文件，keepalived也不会报错，但是会发现，所创建的关于keepalived的相关参数根本就没有生效。
[root@rhel keepalived-1.2.12]# mkdir /etc/keepalived
[root@rhel keepalived-1.2.12]# ln -s /usr/local/keepalived/etc/keepalived/keepalived.conf /etc/keepalived/keepalived.conf

keepalived.conf

! Configuration File for keepalived

global_defs {
notification_email {
root@localhost
}
notification_email_from keepalived@localhost
smtp_server 127.0.0.1
smtp_connect_timeout 30
router_id LVS_DEVEL
}

vrrp_script Monitor_Nginx {
script "/monitor_nginx.sh"
interval 2
weight 2
}

vrrp_instance VI_1 {
state MASTER
interface ens192
virtual_router_id 51
priority 100
advert_int 1
authentication {
auth_type PASS
auth_pass 123456
}

track_script {
Monitor_Nginx #(调用nginx进程检测脚本)
}

virtual_ipaddress {
172.16.9.30
}

}

monitor_nginx.sh

#!/bin/bash

if [ "$(ps -ef | grep "nginx: master process"| grep -v grep )" == "" ]

then

killall keepalived

fi

 

chmod 777 /monitor_nginx.sh

sed -i 's/\r$//' /monitor_nginx.sh

启动测试：
[root@rhel keepalived-1.2.12]# service keepalived restart
停止 keepalived： [确定]
启动 keepalived： [确定]

安装完成

service keepalived restart
service keepalived stop
service keepalived start

systemctl start keepalived
systemctl restart keepalived
systemctl stop keepalived