Nginx+Keepalived 实现反代 负载均衡 高可用(HA)配置

Nginx+Keepalived实现反代负载均衡高可用(HA)配置

Nginx+Keepalived实现反代负载均衡高可用配置

后端：192.168.26.212和192.168.26.218服务器配置安装这里略过。

192.168.26.210和192.168.26.211安装Keepalived 和Nginx:

Yum install nginx

编辑配置文件：vim /usr/local/nginx/conf/nginx.conf

#user  nobody;

worker_processes  1;

#error_log  logs/error.log;

#error_log  logs/error.log  notice;

#error_log  logs/error.log  info;

#pid        logs/nginx.pid;

events {

worker_connections  1024;

}

http {

include       mime.types;

default_type  application/octet-stream;

#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  logs/access.log  main;

sendfile        on;

#tcp_nopush     on;

#keepalive_timeout  0;

keepalive_timeout  65;

upstream nginx.jerry.com {

# ip_hash;

server 192.168.26.212:80;

server 192.168.26.218:80;

}

#gzip  on;

server {

listen       80;

server_name  nginx.jerry.com;

#charset koi8-r;

#access_log  logs/host.access.log  main;

location / {

root   html;

index  index.html index.htm;

proxy_pass http://nginx.jerry.com;

}

#error_page  404              /404.html;

# redirect server error pages to the static page /50x.html

#

error_page   500 502 503 504  /50x.html;

location = /50x.html {

root   html;

}

# proxy the PHP scripts to Apache listening on 127.0.0.1:80

#

#location ~ \.php$ {

#    proxy_pass   http://127.0.0.1;

#}

# pass the PHP scripts to FastCGI server listening on 127.0.0.1:9000

#

#location ~ \.php$ {

#    root           html;

#    fastcgi_pass   127.0.0.1:9000;

#    fastcgi_index  index.php;

#    fastcgi_param  SCRIPT_FILENAME  /scripts$fastcgi_script_name;

#    include        fastcgi_params;

#}

# deny access to .htaccess files, if Apache‘s document root

# concurs with nginx‘s one

#

#location ~ /\.ht {

#    deny  all;

#}

}

# another virtual host using mix of IP-, name-, and port-based configuration

#

#server {

#    listen       8000;

#    listen       somename:8080;

#    server_name  somename  alias  another.alias;

#    location / {

#        root   html;

#        index  index.html index.htm;

#    }

#}

# HTTPS server

#

#server {

#    listen       443 ssl;

#    server_name  localhost;

#    ssl_certificate      cert.pem;

#    ssl_certificate_key  cert.key;

#    ssl_session_cache    shared:SSL:1m;

#    ssl_session_timeout  5m;

#    ssl_ciphers  HIGH:!aNULL:!MD5;

#    ssl_prefer_server_ciphers  on;

#    location / {

#        root   html;

#        index  index.html index.htm;

#    }

#}

}

注意：192.168.26.211安装nginx配置完全相同这里略过。

192.168.26.210安装keepalived。

yum install -y keepalived

安装成功后编辑配置文件：vim /etc/keepalived/keepalived.conf

Keepalived配置文件：keepalived.conf

! Configuration File for keepalived

global_defs {

notification_email {

[email protected]

[email protected]

}

notification_email_from [email protected]

smtp_server smtp.hysec.com

smtp_connect_timeout 30

router_id nginx

}

vrrp_script Monitor_Nginx {

script "/etc/keepalived/chk_nginx.sh"

interval 2

weight 2

}

vrrp_instance VI_1 {

state MASTER

interface eth0

virtual_router_id 51

priority 100

advert_int 1

authentication {

auth_type PASS

auth_pass 1111

}

track_script {

Monitor_Nginx

}

virtual_ipaddress {

192.168.27.210

}

}

Nginx状态检测脚本：vim /etc/keepalived/chk_nginx.sh

#!/bin/bash

A=`ps -C nginx --no-header |wc -l`

if [ $A -eq 0 ];then

echo ‘nginx server is died‘

/etc/init.d/keepalived stop

fi

192.168.26.211keepalived配置文件基本相同：

! Configuration File for keepalived

global_defs {

notification_email {

[email protected]

[email protected]

}

notification_email_from [email protected]

smtp_server smtp.hysec.com

smtp_connect_timeout 30

router_id nginx

}

vrrp_script Monitor_Nginx {

script "/etc/keepalived/chk_nginx.sh"

interval 2

weight 2

}

vrrp_instance VI_1 {

state BACKUP

interface eth0

virtual_router_id 51

priority 99

advert_int 1

authentication {

auth_type PASS

auth_pass 1111

}

track_script {

Monitor_Nginx

}

virtual_ipaddress {

192.168.27.210

}

}

Nginx状态检测脚本：vim /etc/keepalived/chk_nginx.sh

#!/bin/bash

A=`ps -C nginx --no-header |wc -l`

if [ $A -eq 0 ];then

echo ‘nginx server is died‘

/etc/init.d/keepalived stop

fi

安装完成后启动NGINX和keepalived服务。

通过vip:192.168.27.210访问网站：

http://192.168.27.210

访问成功实现了RR负载均衡。

测试通过域名访问网站：http://nginx.jerry.com

同样实现了RR负载均衡。

再把192.168.26.210上的NGINX关闭，测试能否实现vip转移(ha)

仍然可以访问：

测试成功

基于ip_hash访问效果（配置前端NGINX参数）