centos7下keepalived+nginx配置

Posted 2020-11-08

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一、系统架构：

角色                                内网ip                    外网ip
keepalived+nginx           192.168.8.81         192.168.8.201
keepalived+nginx           192.168.8.82         192.168.8.201
web1                              192.168.8.83          -
web2                              192.168.8.84          -

二、nginx配置（两台nginx配置一模一样）：

安装：
```
yum  -y  install  nginx
```

配置：
vim /etc/nginx/nginx.conf

user nginx;
worker_processes auto;
error_log /var/log/nginx/error.log;
pid /run/nginx.pid;
include /usr/share/nginx/modules/*.conf;
events {
worker_connections 1024;
}
http {
log_format  main  ‘$remote_addr - $remote_user [$time_local] "$request" ‘
                  ‘$status $body_bytes_sent "$http_referer" ‘
                  ‘"$http_user_agent" "$http_x_forwarded_for"‘;
access_log  /var/log/nginx/access.log  main;
sendfile            on;
tcp_nopush          on;
tcp_nodelay         on;
keepalive_timeout   65;
types_hash_max_size 2048;
include             /etc/nginx/mime.types;
default_type        application/octet-stream;
include /etc/nginx/conf.d/*.conf;
upstream myProxy {
    server 192.168.8.83:80;
    server 192.168.8.84:80;
}
server {
    listen       80 default_server;
    listen       [::]:80 default_server;
    server_name  _;
    root         /usr/share/nginx/html;
    include /etc/nginx/default.d/*.conf;
    location / {
        proxy_pass http://myProxy;
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; 
    }
    error_page 404 /404.html;
        location = /40x.html {
    }
    error_page 500 502 503 504 /50x.html;
        location = /50x.html {
    }
}
}

启动：
```
systemctl  start  nginx
```
三、keepalived配置：

I、主服务器配置（192.168.8.81）：
安装：
```
yum  -y  install  keepalived
```

配置：
vim /etc/keepalived/keepalived.conf

! Configuration File for keepalived
global_defs {
}
vrrp_script chk_nginx {
script "/etc/keepalived/check.sh"
interval 1
weight -15
}
vrrp_instance VI_1 {
state MASTER
interface eth0
virtual_router_id 51
priority 100
advert_int 1
authentication {
    auth_type PASS
    auth_pass 123456
}
virtual_ipaddress {
    192.168.8.201
}
track_script {
    chk_nginx
}
notify_master "/etc/keepalived/notify.sh master"
notify_backup "/etc/keepalived/notify.sh backup"
notify_fault "/etc/keepalived/notify.sh fault"
}

添加服务检查脚本（check.sh）：
vim /etc/keepalived/check.sh

#!/bin/bash
# 心跳检测：如果服务还在运行返回0，否则返回1
if [ "`ps -aux | grep nginx | wc -l`" == "0" ] ; then
exit 1
else
exit 0
fi

通知脚本（notify.sh）：
vim /etc/keepalived/notify.sh

#!/bin/bash
# 通知脚本：具体操作
if [ "$1" == "master" ] ; then
echo "`date +%F` `date +%T`：切换到主机模式" >> /var/log/keepalived/keepalived.log
elif [ "$1" == "backup" ] ; then
/usr/bin/systemctl start nginx
echo "`date +%F` `date +%T`：切换到备机模式" >> /var/log/keepalived/keepalived.log
else
/usr/bin/systemctl start nginx
echo "`date +%F` `date +%T`：宕机" >> /var/log/keepalived/keepalived.log
fi

给脚本添加可执行权限：

chmod  +x  /etc/keepalived/check.sh
chmod  +x  /etc/keepalived/notify.sh

创建日志目录：
```
mkdir  /var/log/keepalived
```
启动：
```
systemctl  start  keepalived
```
II、备服务器配置（192.168.8.82）：
安装：
```
yum  -y  install  keepalived
```

配置：
vim /etc/keepalived/keepalived.conf

! Configuration File for keepalived
global_defs {
}
vrrp_script chk_nginx {
script "killall -0 nginx"
interval 1
weight -15
}
vrrp_instance VI_1 {
state BACKUP
interface eth0
virtual_router_id 51
priority 99
advert_int 1
authentication {
    auth_type PASS
    auth_pass 123456
}
virtual_ipaddress {
    192.168.8.201
}
track_script {
    chk_nginx
}
notify_master "/etc/keepalived/notify.sh master"
notify_backup "/etc/keepalived/notify.sh backup"
notify_fault "/etc/keepalived/notify.sh fault"
}

添加服务检查脚本（check.sh）：
vim /etc/keepalived/check.sh

#!/bin/bash
# 心跳检测：如果服务还在运行返回0，否则返回1
if [ "`ps -aux | grep nginx | wc -l`" == "0" ] ; then
exit 1
else
exit 0
fi

通知脚本（notify.sh）：
vim /etc/keepalived/notify.sh

#!/bin/bash
# 通知脚本：具体操作
if [ "$1" == "master" ] ; then
echo "`date +%F` `date +%T`：切换到主机模式" >> /var/log/keepalived/keepalived.log
elif [ "$1" == "backup" ] ; then
/usr/bin/systemctl start nginx
echo "`date +%F` `date +%T`：切换到备机模式" >> /var/log/keepalived/keepalived.log
else
/usr/bin/systemctl start nginx
echo "`date +%F` `date +%T`：宕机" >> /var/log/keepalived/keepalived.log
fi

给脚本添加可执行权限：

chmod  +x  /etc/keepalived/check.sh
chmod  +x  /etc/keepalived/notify.sh

创建日志目录：
```
mkdir  /var/log/keepalived
```
启动：
```
systemctl  start  keepalived
```
三、测试：

I、测试负载均衡：

II、测试心跳检测（主服务器：192.168.8.81）：
停止nginx服务：
```
systemctl  stop  nginx
```

查看日志：

tail  /var/log/keepalived/keepalived.log

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centos7下keepalived+nginx配置

一、系统架构：

二、nginx配置（两台nginx配置一模一样）：

三、keepalived配置：

I、主服务器配置（192.168.8.81）：

II、备服务器配置（192.168.8.82）：

三、测试：

I、测试负载均衡：

II、测试心跳检测（主服务器：192.168.8.81）：