keepalived是什么

keepalived直译就是保持存活，在网络里面就是保持在线了，也就是所谓的高可用或热备，用来防止单点故障(单点故障是指一旦某一点出现故障就会导致整个系统架构的不可用)的发生，keepalived实现的基础是vrrp，至于vrrp是什么请直接看这里，下面我们直接看应用吧。

keepalived使用

为了方便使用，写了一个基于ubuntu 16.04 server 的一键配置脚本，配置使用相关就在脚本里见吧

#!/bin/bash# nginx+keepalived 高可用一键脚本for ubuntu 16.04if [ $# -ne 4 ]; then    echo "USAGE: $0 [MASTER|BACKUP] priority interface virtual_ipaddress"    exit 0fiecho -e 'Installing nginx'apt-get install nginx -y > /dev/null 2<&1echo -e 'Installing keepalived'apt-get install keepalived -y > /dev/null 2<&1echo -e 'Configuring keepalived'if [ ! -e /etc/keepalived ];then    mkdir /etc/keepalivedficat > /etc/keepalived/keepalived.conf <
    
      /etc/keepalived/check_nginx.sh <