一、安装nginx
我们这边默认安装的nginx的是1.12.2的版本，所以我们需要安装1.16.1版本的nginx的，才好，所以我们这边先更新yum源，步骤如下：
1、添加yum源：
[root@shtw-nk08 sbin]# cd /etc/yum.repos.d/ [root@shtw-nk08 sbin]# vim nginx.repo [nginx-stable] name=nginx stable repo baseurl=http://nginx.org/packages/centos/$releasever/$basearch/ gpgcheck=1 enabled=1 gpgkey=https://nginx.org/keys/nginx_signing.key [nginx-mainline] name=nginx mainline repo baseurl=http://nginx.org/packages/mainline/centos/$releasever/$basearch/ gpgcheck=1 enabled=0 gpgkey=https://nginx.org/keys/nginx_signing.key
2、yum安装nginx
[root@shtw-nk08 nginx]#yum install nginx
3、查看nginx的版本
[root@shtw-nk08 yum.repos.d]# nginx -v nginx version: nginx/1.16.1
4、重启、关闭、测试nginx
[root@shtw-nk08 nginx]# nginx -s reload #重启nginx [root@shtw-nk08 nginx]# nginx -s stop #停止nginx [root@shtw-nk08 nginx]# nginx -t #测试 nginx: the configuration file /etc/nginx/nginx.conf syntax is ok nginx: configuration file /etc/nginx/nginx.conf test is successful
5、如果nginx -s reload报错了，则执行下面脚本：
[root@shtw-nk08 nginx]# nginx -c /etc/nginx/nginx.conf
二、安装keepalived
1、IP的准备
| 主(nginx) | 10.55.202.213 |
| 从(nginx) | 10.55.202.214 |
| 虚拟ip(主) | 10.55.202.107 |
| 虚拟ip(从) | 10.55.202.108 |
2、安装keepalived
说明：主备都需要安装：
[root@shtw-nk08 keepalived]# yum install keepalived
3、配置文件修改
主nginx的keepalived修改：
[root@shtw-nk08 keepalived]# cd /etc/keepalived/
[root@shtw-nk08 keepalived]# mv keepalived.conf keepalived.conf.bak
[root@shtw-nk08 keepalived]# vim keepalived.conf
! Configuration File for keepalived
group {
VI_1
}
vrrp_script chk_http_port {
script "/usr/local/sbin/check_ng.sh"
interval 2
weight -20
}
vrrp_instance VI_1 {
state MASTER #表示主的nginx
interface eth0
virtual_router_id 51
priority 100
advert_int 1
mcast_src_ip 10.55.202.213 #主nginx的ip地址
authentication {
auth_type PASS
auth_pass 1111
}
track_script {
chk_http_port
}
virtual_ipaddress {
10.55.202.107 #主的虚拟ip
}
}
vrrp_instance VI_2 {
state BACKUP #备份的意思
interface eth0
virtual_router_id 61
priority 99
advert_int 1
mcast_src_ip 10.55.202.213 #还是主的ip地址
authentication {
auth_type PASS
auth_pass 1111
}
track_script {
chk_http_port
}
virtual_ipaddress {
10.55.202.108 #备份的虚拟ip地址
}
}
从的nginx的keepalived的配置：
[root@shtw-nk08 keepalived]# cd /etc/keepalived/
[root@shtw-nk08 keepalived]# mv keepalived.conf keepalived.conf.bak
[root@shtw-nk08 keepalived]# vim keepalived.conf
! Configuration File for keepalived
group {
VI_1
}
vrrp_script chk_http_port {
script "/usr/local/sbin/check_ng.sh"
interval 2
weight -20
}
vrrp_instance VI_1 {
state BACKUP #表示从的nginx
interface eth0
virtual_router_id 51
priority 99
advert_int 1
mcast_src_ip 10.55.202.214 #从的ip地址
authentication {
auth_type PASS
auth_pass 1111
}
track_script {
chk_http_port
}
virtual_ipaddress {
10.55.202.107
}
}
vrrp_instance VI_2 {
state MASTER #表示从的
interface eth0
virtual_router_id 61
priority 100
advert_int 1
mcast_src_ip 10.55.202.214 #从的ip地址
authentication {
auth_type PASS
auth_pass 1111
}
track_script {
chk_http_port
}
virtual_ipaddress {
10.55.202.108 #从的虚拟ip地址
}
}
4、配置keepalived双活脚本
说明：这个脚本主从两台机器都需要配置，配置好之后，保存(wq)并退出
[root@shtw-nk05 sbin]# cd /usr/local/sbin
[root@shtw-nk05 sbin]# vim check_ng.sh
#!/bin/bash
#时间变量，用于记录日志
d=`date --date today +%Y%m%d_%H:%M:%S`
#计算nginx进程数量
n=`ps -C nginx --no-heading|wc -l`
#如果进程为0，则启动nginx，并且再次检测nginx进程数量，
#如果还为0，说明nginx无法启动，此时需要关闭keepalived
if [ $n -eq "0" ]; then
/etc/init.d/nginx start
n2=`ps -C nginx --no-heading|wc -l`
if [ $n2 -eq "0" ]; then
echo "$d nginx down,keepalived will stop" >> /var/log/check_ng.log
systemctl stop keepalived
fi
fi
5、启动keepalived
[root@shtw-nk08 keepalived]# systemctl start keepalived #启动keepalived [root@shtw-nk08 keepalived]# systemctl status keepalived #查看keepalived状态
如图：
6、启动验证
nginx和keepalived全部启动之后，在浏览器中测试一下：
1、先输入 10.55.202.213 => 访问成功
2、输入 10.55.202.214 => 访问成功
3、输入 10.55.202.107 和 10.55.202.108 =>访问成功
4、关停 10.55.202.213 之后测试 => 访问失败 ，输入10.55.202.107 => 访问成功