配置Nginx为storage server提供http访问接口：
背景：
在大多数业务场景中，往往需要为FastDFS存储的文件提供http下载服务，而尽管FastDFS在其storage及tracker都内置了http服务， 但性能表现却不尽如人意；
作者余庆在后来的版本中增加了基于当前主流web服务器的扩展模块(包括nginx/apache)，其用意在于利用web服务器直接对本机storage数据文件提供http服务，以提高文件下载的性能。
描述：
nginx 配置在storage节点上（本例以storage节点的node2为例）；
因为 Nginx 要想连接 fastdfs 就必须要有相应的模块，所以要编译安装 nginx 把fastdfs-nginx-module 模块编译进去
步骤如下：
1.首先下载 fastdfs-nginx-module 和 编译安装nginx 的源码包
# 从官方站点上克隆 fastdfs-nginx-module 模块
[root@CentOS7 ~]# git clone https://github.com/happyfish100/fastdfs-nginx-module.git
Cloning into 'fastdfs-nginx-module'...
remote: Counting objects: 57, done.
remote: Total 57 (delta 0), reused 0 (delta 0), pack-reused 57
Unpacking objects: 100% (57/57), done.
# 准备好的nginx源码包如下
[root@centos7 fastdfs]# ls
fastdfs-nginx-module nginx-1.10.0.tar.gz
[root@centos7 fastdfs]# tar xf nginx-1.10.0.tar.gz
[root@centos7 fastdfs]# ls
fastdfs-nginx-module nginx-1.10.0 nginx-1.10.0.tar.gz
2.准备编译安装的环境
yum groupinstall "Development Tools" "Server Platfrom Development" -y
yum install pcre-devel openssl-devel zlib-devel -y
3.创建 nginx 用户编译安装nginx，指明 fastdfs-nginx-module 模块的位置
[root@centos7 nginx-1.10.0]# useradd -r nginx
[root@centos7 nginx-1.10.0]# ls
auto CHANGES CHANGES.ru conf configure contrib html LICENSE Makefile man objs README src
[root@centos7 nginx-1.10.0]# ./configure --prefix=/usr/local/nginx --conf-path=/etc/nginx/nginx.conf
--error-log-path=/var/log/nginx/error.log --http-log-path=/var/log/nginx/access.log
--pid-path=/var/run/nginx/nginx.pid --lock-path=/var/lock/nginx.lock --user=nginx --group=nginx
--with-http_ssl_module --with-http_stub_status_module --with-pcre --add-module=/root/fastdfs/fastdfs-nginx-module/src
[root@centos7 nginx-1.10.0]# make && make install
3、复制配置文件
# cp fastdfs-nginx/module/src/mod_fastdfs.conf /etc/fdfs/
# cp fastdfs-5.0.8/conf/{httpd.conf,mime.types} /etc/fdfs/
注意：fastdfs-5.0.8为fastdfs源码目录；
4、配置/etc/fdfs/mod_fastdfs.conf配置文件，部分指令类似如下所示；
base_path=/data/fdfs/storage
tracker_server=192.168.1.112:22122
storage_server_port=23000
group_name=group1
url_have_group_name = true
store_path_count=1
store_path0=/data/fdfs/storage/0
[group1]
group_name=group1
storage_server_port=23000
store_path_count=1
store_path0=/data/fdfs/storage/0
5、配置nginx，编辑nginx.conf，在server中添加类似如下内容：
location ~ /group[0-9]+/M00/ {
root /data/fdfs/storage/0/data/;
ngx_fastdfs_module;
}
6、为存储文件路径创建链接至M00，此示例中使用的storage_path0为/data/fdfs/storage/0；
# ln -sv /data/fdfs/storage/0 /data/fdfs/storage/0/M00
[root@centos7 ~]# ll /data/fdfs/storage/0/
total 12
drwxr-xr-x 258 root root 8192 Mar 24 11:50 data
lrwxrwxrwx 1 root root 20 Mar 24 11:23 M00 -> /data/fdfs/storage/0
7、启动nginx服务即可；
[root@centos7 sbin]# pwd
/usr/local/nginx/sbin
[root@centos7 sbin]# ./nginx -t
ngx_http_fastdfs_set pid=27041
nginx: the configuration file /etc/nginx/nginx.conf syntax is ok
nginx: configuration file /etc/nginx/nginx.conf test is successful
[root@centos7 sbin]# ./nginx
[root@centos7 sbin]# ps aux| grep 'nginx'
root 27011 0.0 0.1 52880 1160 ? Ss 11:25 0:00 nginx: master process ./nginx
nginx 27012 0.0 0.2 55524 2516 ? S 11:25 0:00 nginx: worker process
8、上传文件，测试：
# node3 节点上传文件
[root@centos7 fdfs]# fdfs_upload_file /etc/fdfs/client.conf /usr/share/wallpapers/Autumn/contents/images/1600x1200.jpg
group1/M00/00/00/wKgBcVjUlzqAEyeUAAxFCUUQ0Sc981.jpg
[root@centos7 fdfs]# fdfs_file_info /etc/fdfs/client.conf group1/M00/00/00/wKgBcVjUlzqAEyeUAAxFCUUQ0Sc981.jpg
source storage id: 0
source ip address: 192.168.1.113
file create timestamp: 2017-03-24 11:49:14
file size: 804105
file crc32: 1158730023 (0x4510D127)
[root@centos7 fdfs]# fdfs_upload_file /etc/fdfs/client.conf /usr/share/wallpapers/Hanami/contents/images/1920x1200.jpg
group1/M00/00/00/wKgBcljUGkCAEkdsAAqAdF8ZgSw271.jpg
[root@centos7 fdfs]# fdfs_file_info /etc/fdfs/client.conf group1/M00/00/00/wKgBcljUGkCAEkdsAAqAdF8ZgSw271.jpg
source storage id: 0
source ip address: 192.168.1.114
file create timestamp: 2017-03-24 02:56:00
file size: 688244
file crc32: 1595506988 (0x5F19812C)
9.在浏览器中访问路径的URL为fid：
