centos7实现负载均衡

目录

[一、基于 CentOS 7 构建 LVS-DR 集群。](#一、基于 CentOS 7 构建 LVS-DR 集群。)

[1.1 配置lvs负载均衡服务](#1.1 配置lvs负载均衡服务)

[1.1.1 下载ipvsadm](#1.1.1 下载ipvsadm)

[1.1.2 增加vip](#1.1.2 增加vip)

[1.1.3 配置ipvsadm](#1.1.3 配置ipvsadm)

[1.2 配置rs1](#1.2 配置rs1)

[1.2.1 编写测试页面](#1.2.1 编写测试页面)

[1.2.2 手工在RS端绑定VIP、添加路由](#1.2.2 手工在RS端绑定VIP、添加路由)

[1.2.3 抑制arp响应](#1.2.3 抑制arp响应)

[1.3 配置rs2](#1.3 配置rs2)

[1.4 测试](#1.4 测试)

二、配置nginx负载均衡。

[2.1 配置好环境](#2.1 配置好环境)

[2.2 web服务器上添加测试页面](#2.2 web服务器上添加测试页面)

[2.3 配置负载均衡器](#2.3 配置负载均衡器)

[2.4 开启nginx服务和web服务](#2.4 开启nginx服务和web服务)

[2.5 测试](#2.5 测试)

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一、基于 CentOS 7 构建 LVS-DR 集群。

环境：

|----------------|--------------|----------------------|
| 　 | 作用 | 环境 |
| windows | 测试 | 　 |
| 192.168.33.158 | LVS负载均衡 | centos7 |
| 192.168.33.157 | web服务器1--rs1 | nginx：1.22，centos7 |
| 192.168.33.156 | web服务器2--rs2 | Apache：2.4 ， redhat9 |

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1.1 配置lvs负载均衡服务

1.1.1 下载ipvsadm

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1.1.2 增加vip

ifconfig ens33:110 192.168.33.100

注意：增加的IP和本机的IP需要在同一个网段。

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1.1.3 配置ipvsadm

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1.2 配置rs1

1.2.1 编写测试页面

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1.2.2 手工在RS端绑定VIP、添加路由

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1.2.3 抑制arp响应

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1.3 配置rs2

配置和rs1一样，省略。

注意：调整内核参数，关闭arp响应的时候，redhat和centos的网络设备名称是不一样的。

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1.4 测试

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二、配置nginx负载均衡。

2.1 配置好环境

|----------------|---------------|----------------------|
| | 作用 | 环境 |
| windows | 测试 | |
| 192.168.33.158 | nginx负载均衡 | nginx：1.22，centos7 |
| 192.168.33.157 | web服务器1--web1 | nginx：1.22，centos7 |
| 192.168.33.156 | web服务器2--web2 | Apache：2.4 ， redhat9 |

确保所有的防火墙和selinx都是关闭的。

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2.2 web服务器上添加测试页面

web1：

web2：

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2.3 配置负载均衡器

主配置文件：/usr/local/nginx/conf/nginx.conf

user nginx;
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;

    #gzip  on;
    include /etc/nginx/conf.d/*.conf;
    server {
        listen       80;
        server_name  localhost;
        #charset koi8-r;

        #access_log  logs/host.access.log  main;

        location / {
           root   html;
           index  index.html index.htm;
        }
        #location / {
	#   root /data/web2;
	#   index index.html index.htm;
	#   auth_basic "Restricted";
	#   auth_basic_user_file /data/web2/webpass;
	#}
	location ~ \.php$ {
		root html;
		fastcgi_pass 127.0.0.1:9000;
		fastcgi_index index.php;
		fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
		include	fastcgi_params;
	}

        #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;
    #    }
    #}

}

子配置文件：/etc/nginx/conf.d/vhost.conf

server {
	listen 80;
	server_name test.ng.test;
	location / {
	  proxy_pass http://web_server;
	}

}

upstream web_server {
	server 192.168.33.157;
	server 192.168.33.156;
}

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2.4 开启nginx服务和web服务

systemctl start nginx

systemctl start httpd

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2.5 测试

用windows测试的时候，需要修改本地的hosts文件。路径：C:\Windows\System32\drivers\etc

windows 浏览器的测试

因为是一般轮询负载均衡，所以不断刷新页面，页面会在192.168.33.157和192.168.33.156之间交替出现。