centos7搭建高可用负载均衡服务器及常见错误解决方案

本文章基于centos7版本安装nginx+keepalived高可用服务器，在yum命令可用情况下安装：

1.安装编译环境 yum install gcc-c++；

2.安装PCRE库：yum install -y pcre pcre-devel；

3.安装zlib库：yum install -y zlib zlib-devel；

4.安装OpenSSL:yum install -y openssl openssl-devel；

5.下载nginx安装包：wget -c https://nginx.org/download/nginx-1.10.1.tar.gz；

6.解压nginx：tar -zxvf nginx-1.10.1.tar.gz；

7.cd nginx-1.10.1；

8. ./configure --prefix=/usr/local/nginx （./configure --prefix=安装路径）；

9.make && make install（ 编译并安装）；

10./usr/local/nginx/sbin/nginx启动nginx；

11.ps aux | grep 'nginx'查看nginx是否启动；

12.若防火墙没有关闭，记得关闭防火墙 ：service iptables stop关闭虚拟机防火墙；

keepalived安装：

1.下载keepalived:wget -c http://www.keepalived.org/software/keepalived-1.2.22.tar.gz

2.解压 tar -zxvf keepalived-1.2.22.tar.gz
3.cd keepalived-1.2.22
4../configure --prefix=/usr/local/keepalived
5.make编译
6.make install 安装

7.mkdir -p /etc/keepalived/

//配置keepalived为系统服务，开机重启

8. cp /usr/local/keepalived/etc/keepalived/keepalived.conf /etc/keepalived/
9. cp /usr/local/keepalived/etc/rc.d/init.d/keepalived /etc/init.d
10. cp /usr/local/keepalived/etc/sysconfig/keepalived /etc/sysconfig/
11. cp /usr/local/keepalived/sbin/keepalived /usr/sbin/
12. chkconfig keepalived on设置开机启动

13.systemctl start keepalived.service启动服务或service keepalived start

在安装过程中出现一个问题：Unregistered Authentication Agent for unix-process:8932:1523243 (system bus name :1.128, object path /org/freedesktop/PolicyKit1/AuthenticationAge

这个问题的原因通过查看keepalived的启动日志，日志目录在/usr/log/messages里面，发现有一个命令没有找到的错误，原因是/usr/local/keepalived/sbin/keepalived没有拷贝到/usr/sbin/目录下，拷贝过去，问题解决！