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关于FastDFS蛋疼的集群和负载均衡(五)之tracker配置反向代理

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Interesting things

接着上一篇。

What did you do today

我们需要在tracker1和tracker2配置反向代理服务，那么你肯定会问了什么是反向代理服务？

反向代理(Reverse Proxy)方式是指以代理服务器来接受internet上的连接请求，然后将请求转发给内部网络上的服务器，并将从服务器上得到的结果返回给internet上请求连接的客户端，此时代理服务器对外就表现为一个反向代理服务器。
在tracker1和tracker2上解压ngx_cache_purge-2.3.tar.gz文件到/usr/local/fast/
命令：tar zxvf ngx_cache_purge-2.3.tar.gz -C /usr/local/fast/
我们发现/usr/local/fast/目录下多了ngx_cache_purge-2.3文件夹。
下载依赖库 yum install pcre、yum install pcre-devel、yum install zlib、yum install zlib-devel
解压nginx-1.6.2.tar.gz到/usr/local/目录下，命令: tar -zxvf nginx-1.6.2.tar.gz -C /usr/local/
进入/usr/local/nginx-1.6.2/目录下，
cd /usr/local/nginx-1.6.2/
添加ngx_cache_purge-2.3模块并且检查。命令:./configure --add-module=/usr/local/fast/ngx_cache_purge-2.3/
老操作，make && make install编译安装nginx。
进入/usr/local/nginx/conf/目录下，找到nginx.conf，配置反向代理。
```
#user  nobody;
worker_processes  1;
```

error_log /usr/local/nginx/logs/error.log;
error_log /usr/local/nginx/logs/error.log notice;
error_log /usr/local/nginx/logs/error.log info;

pid /usr/local/nginx/logs/nginx.pid;

events {
worker_connections 1024;
use epoll;
}

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 /usr/local/nginx/logs/access.log  main;

sendfile        on;
tcp_nopush      on;
#tcp_nopush     on;

#keepalive_timeout  0;
keepalive_timeout  65;

#gzip  on;
    server_names_hash_bucket_size   128;
    client_header_buffer_size       32k;
    large_client_header_buffers     4       32k;
    client_max_body_size    300m;

    proxy_redirect  off;
    proxy_set_header        Host    $http_host;
    proxy_set_header        X-Real-IP       $remote_addr;
    proxy_set_header        X-Forwarded-For $proxy_add_x_forwarded_for;
    proxy_connect_timeout   90;
    proxy_send_timeout      90;
    proxy_read_timeout      90;
    proxy_buffer_size       16k;
    proxy_buffers   4       64k;
    proxy_busy_buffers_size 128k;
    proxy_temp_file_write_size      128k;

    proxy_cache_path        /fastdfs/cache/nginx/proxy_cache levels=1:2
    keys_zone=http-cache:200m       max_size=1g     inactive=30d;
    proxy_temp_path /fastdfs/cache/nginx/proxy_cache/tmp;

    upstream fdfs_group1 {
            server 192.168.12.33:8888 weight=1  max_fails=2 fail_timeout=30s;
            server 192.168.12.44:8888 weight=1  max_fails=2 fail_timeout=30s;

    }

    upstream fdfs_group2 {
            server 192.168.12.55:8888 weight=1 max_fails=2 fail_timeout=30s;
            server 192.168.12.66:8888 weight=1 max_fails=2 fail_timeout=30s;

    }
server {

    listen      8000;
    server_name  localhost;

    #charset koi8-r;

   access_log  /usr/local/nginx/logs/host.access.log  main;

   location / {
       root   html;
       index  index.html index.htm;
   }

    location /group1/M00 {
            proxy_next_upstream http_502 http_504 error timeout invalid_header;
            proxy_cache http-cache;
            proxy_cache_valid 200 304 12h;
            proxy_cache_key $uri$is_args$args;
            proxy_pass http://fdfs_group1;
            expires 30d;

    }

    location /group2/M00 {
            proxy_next_upstream http_502 http_504 error timeout invalid_header;
            proxy_cache http-cache;
            proxy_cache_valid 200 304 12h;
            proxy_cache_key $uri$is_args$args;
            proxy_pass http://fdfs_group2;
            expires 30d;
    }

    location ~/purge(/.*) {
            allow 127.0.0.1;
            allow 192.168.12.0/24;
            deny all;
            proxy_cache_purge http-cache $1$is_args$args;

    }

   # location ~/group([0-9])/M00 {  
        # ngx_fastdfs_module;   
    # }

    #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;
#    }
#}

}



* 创建/fastdfs/cache/nginx/proxy_cache
和/fastdfs/cache/nginx/proxy_cache/tmp，因为proxy_cache_path和proxy_temp_path设置了路径，所以我们要创建。
![image.png](http://upload-images.jianshu.io/upload_images/4636177-088ff04e42ae3d45.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)

![image.png](http://upload-images.jianshu.io/upload_images/4636177-9be69ce6b20b90f7.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)

* 由于tracker1和tracker2的端口是8000，所以需要在防火墙配置8000端口。
-A INPUT -p tcp -m state --state NEW -m tcp --dport 8000 -j ACCEPT，然后重启防火墙，让策略生效。
![image.png](http://upload-images.jianshu.io/upload_images/4636177-4f382b17e011ea0f.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)

* 启动tracker1和tracker2的nginx。命令：/usr/local/nginx/sbin/nginx
![image.png](http://upload-images.jianshu.io/upload_images/4636177-f4348369d2836b41.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)

* 我们在tracker1上传2张图片，发现一张存储在group1，一张存储在group2.
![image.png](http://upload-images.jianshu.io/upload_images/4636177-e34246347bb81a7f.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)

* 我们可以通过tracker1(192.168.12.11)和tracker2(192.168.12.22)的8000端口去访问这2张图片。

* 访问http://192.168.12.11:8000/group1/M00/00/00/wKgMIVpEgoSAcs8VAADRd6mMX3g514.jpg
![image.png](http://upload-images.jianshu.io/upload_images/4636177-2f5f920b1af80306.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)

* 访问http://192.168.12.22:8000/group2/M00/00/00/wKgMQlpEgoaABUrWAADRd6mMX3g168.jpg

![image.png](http://upload-images.jianshu.io/upload_images/4636177-9cbefd28fc3d259d.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)

###Summary
> Nginx对外提供服务有可能碰到服务挂掉的时候，我们需要搭建一个nginx和keepalived集合实现的nginx集群高可用环境，下一篇讲。

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