linux负载均衡

1.linux lvs nat实现负载均衡

　　添加两块网卡并开启路由管道

echo 1 > /proc/sys/net/ipv4/ip_forward //开始路由管道

　　安装ipvsadm

yum install ipvsadm

　　配置ipvsadm

iptables -F //清楚防火墙

ipvsadm -C //清楚ipvsadm配置

ipvsadm -At 8.8.8.8:80 -s rr //告诉ipvsadm 调度8.8.8.8的80端口，并且调度模式为轮询(-s rr)

//设置调度的真实服务器

ipvsadm -at 8.8.8.8:80 -r 192.168.1.10:80 -m

ipvsadm -at 8.8.8.8:80 -r 192.168.1.11:80 -m

//在这里假设外网IP为8.8.8.8，内网IP为192.168.1.2，内网两台服WEB服务器分别为192.168.1.10,192.168.1.11并且网关指向192.168.1.2

 

2.nginx反向代理实现负载均衡

yum安装nginx

//添加nginx的yum包

rpm -ivh http://nginx.org/packages/centos/6/noarch/RPMS/nginx-release-centos-6-0.el6.ngx.noarch.rpm



yum install nginx

配置代理服务器

//修改/ect/nginx/nginx.conf

    client_max_body_size 300m;

    client_body_buffer_size 128k;

    client_body_temp_path /dev/shm/client_body_temp;

    proxy_read_timeout 600;

    proxy_send_timeout 600;

    proxy_buffer_size 16k;

    proxy_buffers 4 32k;

    proxy_busy_buffers_size 64k;

    proxy_temp_file_write_size 64k;

    proxy_temp_path /dev/shm/proxy_temp;

    upstream cluster{

        server 192.168.1.10:80 weight=8 max_fails=2 fail_timeout=30s;   

        server 192.168.1.11:80 weight=8 max_fails=2 fail_timeout=30s;   

    }

//修改/ect/nginx/conf.d/defaut.conf

    location / {

        root   /usr/share/nginx/html;

        index  index.html index.htm;

        proxy_pass http://cluster/;

        proxy_redirect off;

        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;

        proxy_set_header Host $host;

    }