负载均衡与keepalived

[root@lb01 ~]# curl   10.0.0.5 
web01 www.oldboy.com
[root@lb01 ~]# curl   10.0.0.5 
web02 www.oldboy.com
[root@lb01 ~]# curl   10.0.0.5 
web01 www.oldboy.com
[root@lb01 ~]# curl   10.0.0.5 
web02 www.oldboy.com

                                 --->web01 PC 存放在web01  

LB01  判断用户客户端类型  ----->  
                                |  
                                 --->web02 移动端    web02 
 
#web01 
echo  this is  PC website   >/app/www/lidao.html 

#web02
echo  this is  Mobile website   >/app/www/lidao.html  
 
 
[root@lb01 ~]# curl 10.0.0.7/lidao.html 
this is PC website
[root@lb01 ~]# curl 10.0.0.8/lidao.html 
this is Mobile website
 
[root@lb01 ~]# curl 10.0.0.[7-8]/lidao.html 

[1/2]: 10.0.0.7/lidao.html --> <stdout>
--_curl_--10.0.0.7/lidao.html
this is PC website

[2/2]: 10.0.0.8/lidao.html --> <stdout>
--_curl_--10.0.0.8/lidao.html
this is Mobile website 
 
    upstream   default {
    server 10.0.0.7:80 weight=1 max_fails=3 fail_timeout=10s;
    }
    upstream   mobile {
    server 10.0.0.8:80 weight=1 max_fails=3 fail_timeout=10s;
    }

#   include /etc/nginx/conf.d/*.conf;
    server  {
    listen 80;
    server_name www.oldboy.com;
    location  / {
       if ($http_user_agent ~* "Android|IOS") {
       proxy_pass http://mobile;
       }
       proxy_pass http://default;
       proxy_set_header Host $host;
       proxy_set_header X-Forwarded-For  $remote_addr;
       }
    }   
 
[root@lb01 /etc/nginx]# curl   10.0.0.5/lidao.html 
this is PC website
[root@lb01 /etc/nginx]# curl -A ios   10.0.0.5/lidao.html 
this is Mobile website 

根据用户的uri进行转发 动静分离

web01

mkdir -p  /app/www/upload/
echo  this is upload  >/app/www/upload/guoav.html 

#web02  
mkdir -p  /app/www/static/
echo  this is static  >/app/www/static/guoav.html 

#web03  
mkdir -p  /app/www/
echo  this is default  >/app/www/guoav.html 
#测试 
[root@lb01 /etc/nginx]# curl  10.0.0.7/upload/guoav.html 
this is upload
[root@lb01 /etc/nginx]# curl  10.0.0.8/static/guoav.html 
this is static
[root@lb01 /etc/nginx]# curl  10.0.0.9/guoav.html 
this is default 

#修改lb负载均衡配置

nginx.conf核心配置
    upstream   upload {
    server 10.0.0.7:80 weight=1 max_fails=3 fail_timeout=10s;
    }
    upstream   static {
    server 10.0.0.8:80 weight=1 max_fails=3 fail_timeout=10s;
    }
    upstream   default {
    server 10.0.0.9:80 weight=1 max_fails=3 fail_timeout=10s;
    }

#   include /etc/nginx/conf.d/*.conf;
    server  {
    listen 80;
    server_name www.oldboy.com;
    location  /upload {
       proxy_pass http://upload;
       proxy_set_header Host $host;
       proxy_set_header X-Forwarded-For  $remote_addr;
       }
    location  /static {
       proxy_pass http://static;
       proxy_set_header Host $host;
       proxy_set_header X-Forwarded-For  $remote_addr;
    }
    location  / {
       proxy_pass http://default;
       proxy_set_header Host $host;
       proxy_set_header X-Forwarded-For  $remote_addr;
    }    

lb01 lb02 web01 web02

lb01 lb02

yum install keepalived  -y 
    
[root@lb01 /etc/nginx]# cat nginx.conf

user  nginx;
worker_processes  1;

error_log  /var/log/nginx/error.log warn;
pid        /var/run/nginx.pid;


events {
    worker_connections  1024;
}


http {
    include       /etc/nginx/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  /var/log/nginx/access.log  main;

    sendfile        on;
    #tcp_nopush     on;

    keepalive_timeout  65;

    #gzip  on;

    upstream   web_pools {
    ip_hash;
    server 10.0.0.7:80 weight=1 max_fails=3 fail_timeout=10s;
    server 10.0.0.8:80 weight=1 max_fails=3 fail_timeout=10s;
    }
#   include /etc/nginx/conf.d/*.conf;
    server  {
    listen 80;
    server_name www.oldboy.com;
    location  / {
       proxy_pass http://web_pools;
       proxy_set_header Host $host;
       proxy_set_header X-Forwarded-For  $remote_addr;
       }
    }    

    server  {
    listen 80;
    server_name blog.oldboy.com;
    location  / {
       proxy_pass http://web_pools;
       proxy_set_header Host $host;
       proxy_set_header X-Forwarded-For  $remote_addr;
       }
    }
}   
    

cookie session(会话)

共同点：
存放用户信息
key value类型 变量和变量内容

区别
cookie
存放在浏览器
存放钥匙
开发设置
响应服务器给你设置

session
    存放在服务器  redis中
    存放敏感    
    锁头

1）VRRP协议，全称Virtual Router Redundancy Protocol，中文名为虚拟路由冗余协议，VRRP的出现是为了解决静态路由的单点故障。
3）VRRP是用过IP多播的方式（默认多播地址（224.0.0.18））实现高可用对之间通信的。
4）工作时主节点发包，备节点接包，当备节点接收不到主节点发的数据包的时候，就启动接管程序接管主节点的资源。备节点可以有多个，通过优先级竞选，但一般Keepalived系统运维工作中都是一对。

    
! Configuration File for keepalived

global_defs {
    router_id LVS_DEVEL
}

vrrp_instance VI_1 {
    state MASTER
    interface eth0
    virtual_router_id 51
    priority 150
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
     10.0.0.3/24 dev eth0 label eth0:1  
    }
}