FastDFS入门一篇就够

完整安装流程

下载的包都存放在~/caibh/fdfs-package目录下。

下载libfastcommon、fastdfs、fastdfs-nginx-module：

cd ~/caibh/fdfs-package
# -S print server response
# -O write documents to file
wget https://github.com/happyfish100/libfastcommon/archive/V1.0.39.tar.gz -SO libfastcommon.tar.gz
wget https://github.com/happyfish100/fastdfs/archive/V5.11.tar.gz -SO fastdfs.tar.gz
wget https://github.com/happyfish100/fastdfs-nginx-module/archive/V1.20.tar.gz -SO fastdfs-nginx-module.tar.gz
# 解压
tar -xf xxx.tar.gz

　安装 libfastcommon

cd ~/caibh/fdfs-package
cd libfastcommon-1.0.39
./make.sh
./make.sh install

安装 fastdfs

cd ~/caibh/fdfs-package
cd fastdfs-5.11
./make.sh
./make.sh install

安装好后，程序是在/usr/bin目录下：

$ which fdfs_trackerd
/usr/bin/fdfs_trackerd

而配置文件是在/etc/fdfs目录下：

$ cd ~/caibh/fdfs-package/fastdfs-5.11
$ ls /etc/fdfs
client.conf.sample storage_ids.conf.sample  tracker.conf.sample storage.conf.sample

可是这些配置文件是不全的，并且都是模板，因此须要从fastdfs包中拷贝过来，并修改配置：

$ cd ~/caibh/fdfs-package/fastdfs-5.11/conf
$ ls
anti-steal.jpg  client.conf  http.conf  mime.types  storage.conf  storage_ids.conf  tracker.conf
$ sudo cp ~/caibh/fdfs-package/fastdfs-5.11/conf/* /etc/fdfs

修改配置

sudo vi /etc/fdfs/tracker.conf：

# the tracker server port
port=22122

# the base path to store data and log files
base_path=/home/caibh/fdfs

# HTTP port on this tracker server
http.server_port=9270

sudo vi /etc/fdfs/storage.conf：

# storage所属的组
group_name=group1

# the storage server port
port=23000

# the base path to store data and log files
base_path=/home/caibh/fdfs

# store_path#, based 0, if store_path0 not exists, it's value is base_path
# the paths must be exist
store_path0=/home/caibh/fdfs
#store_path1=/home/caibh/fdfs2

# tracker服务器，虽然是同一台机器上，可是不能写127.0.0.1。这项配置能够出现一次或屡次
tracker_server=191.8.1.77:22122

# the port of the web server on this storage server
http.server_port=8888

sudo vi /etc/fdfs/client.conf：

# the base path to store log files
base_path=/home/caibh/fdfs/client
# tracker_server can ocur more than once, and tracker_server format is
#  "host:port", host can be hostname or ip address
tracker_server=191.8.1.77:22122
#HTTP settings
http.tracker_server_port=9270

sudo vi /etc/fdfs/mod_fastdfs.conf：

# the base path to store log files
base_path=/tmp

# FastDFS tracker_server can ocur more than once, and tracker_server format is
#  "host:port", host can be hostname or ip address
# valid only when load_fdfs_parameters_from_tracker is true
tracker_server=191.8.1.77:22122

# the port of the local storage server
# the default value is 23000
storage_server_port=23000

# the group name of the local storage server
group_name=group1

# store_path#, based 0, if store_path0 not exists, it's value is base_path
# the paths must be exist
# must same as storage.conf
store_path0=/home/caibh/fdfs
#store_path1=/home/yuqing/fastdfs1

配置过程当中有几点要注意：

• 确保配置中用到的目录已经建立了。好比~/fdfs/client、~/fdfs/data、~/fdfs/logs

• 确保各类配置文件之间引用的端口一直。好比：

  • mod_fastdfs.conf文件中tracker_server的端口应该跟tracker.conf中port一致；
  • mod_fastdfs.conf文件中storage_server_port的端口应该跟跟storage.conf中port一致；

• 其余配置或文件虽然不用修改，可是fastdfs-nginx-module模块会用到：

  • anti-steal.jpg
  • http.conf
  • mime.types

启动tracker和storage：

# 启动
fdfs_trackerd /etc/fdfs/tracker.conf start
fdfs_storaged /etc/fdfs/storage.conf start
# 查看日志
tail -n10 ~/fdfs/logs/trackerd.log
tail -n10 ~/fdfs/logs/storaged.log
# 若是日志显示有错误信息，须要根据信息来查找错误缘由

用fdfs_test测试上传

$ fdfs_test /etc/fdfs/client.conf upload ~/caibh/test_images/XinXiJuZhiWang.jpg

安装fastdfs-nginx-module

思路：

安装过程比较复杂，因为当前系统已经有一个nginx在运行了，因此要先确认当前系统nginx的版本，而后到官网下载对应版本的nginx源码，而后查看系统nginx的编译选项，用如出一辙的编译选项外加fastdfs-nginx-module的源码，从新编译一个nginx程序。用新的nginx替换系统的nginx。

注意：

这里的安装场景是tracker和storage都装在同一个机器上。

查看已安装并在运行中的nginx的版本：

$ nginx -v
nginx version: nginx/1.10.3 (Ubuntu)

到官网下载对应版本的nginx源码，并解压，更名为nginx-src，而后进入nginx-src目录

查看当前运行的ngxin原来的编译选项：

$ cd ~/caibh/nginx-src
$ nginx -V
nginx version: nginx/1.10.3 (Ubuntu)
built with OpenSSL 1.0.2g  1 Mar 2016
TLS SNI support enabled
configure arguments: --with-cc-opt='-g -O2 -fPIE -fstack-protector-strong -Wformat -Werror=format-security -Wdate-time -D_FORTIFY_SOURCE=2' --with-ld-opt='-Wl,-Bsymbolic-functions -fPIE -pie -Wl,-z,relro -Wl,-z,now' --prefix=/usr/share/nginx --conf-path=/etc/nginx/nginx.conf --http-log-path=/var/log/nginx/access.log --error-log-path=/var/log/nginx/error.log --lock-path=/var/lock/nginx.lock --pid-path=/run/nginx.pid --http-client-body-temp-path=/var/lib/nginx/body --http-fastcgi-temp-path=/var/lib/nginx/fastcgi --http-proxy-temp-path=/var/lib/nginx/proxy --http-scgi-temp-path=/var/lib/nginx/scgi --http-uwsgi-temp-path=/var/lib/nginx/uwsgi --with-debug --with-pcre-jit --with-ipv6 --with-http_ssl_module --with-http_stub_status_module --with-http_realip_module --with-http_auth_request_module --with-http_addition_module --with-http_dav_module --with-http_geoip_module --with-http_gunzip_module --with-http_gzip_static_module --with-http_image_filter_module --with-http_v2_module --with-http_sub_module --with-http_xslt_module --with-stream --with-stream_ssl_module --with-mail --with-mail_ssl_module --with-threads

为了方便编辑，复制上面信息，在nginx-src目录下建立一个custom_configure.sh文件，把复制的内容拷贝进去，并在最后加上fastdfs-nginx-module的源码：

$ cd ~/caibh/nginx-src
$ cat custom_configure.sh 
./configure \
--with-cc-opt='-g -O2 -fPIE -fstack-protector-strong -Wformat -Werror=format-security -Wdate-time -D_FORTIFY_SOURCE=2' \
--with-ld-opt='-Wl,-Bsymbolic-functions -fPIE -pie -Wl,-z,relro -Wl,-z,now' \
--prefix=/usr/share/nginx \
--conf-path=/etc/nginx/nginx.conf \
--http-log-path=/var/log/nginx/access.log \
--error-log-path=/var/log/nginx/error.log \
--lock-path=/var/lock/nginx.lock \
--pid-path=/run/nginx.pid \
--http-client-body-temp-path=/var/lib/nginx/body \
--http-fastcgi-temp-path=/var/lib/nginx/fastcgi \
--http-proxy-temp-path=/var/lib/nginx/proxy \
--http-scgi-temp-path=/var/lib/nginx/scgi \
--http-uwsgi-temp-path=/var/lib/nginx/uwsgi \
--with-debug \
--with-pcre-jit \
--with-ipv6 \
--with-http_ssl_module \
--with-http_stub_status_module \
--with-http_realip_module \
--with-http_auth_request_module \
--with-http_addition_module \
--with-http_dav_module \
--with-http_geoip_module \
--with-http_gunzip_module \
--with-http_gzip_static_module \
--with-http_image_filter_module \
--with-http_v2_module \
--with-http_sub_module \
--with-http_xslt_module \
--with-stream \
--with-stream_ssl_module \
--with-mail \
--with-mail_ssl_module \
--with-threads \
--add-module=~/caibh/fdfs-package/fastdfs-nginx-module-1.20/src

执行custom_configure.sh：

# ~/caibh/nginx-src
# 执行编译
$ sudo ./custom_configure.sh 
# 报错
./configure: error: the HTTP XSLT module requires the libxml2/libxslt
libraries. You can either do not enable the module or install the libraries.
# 解决
sudo apt-get install libxml2 libxml2-dev libxslt-dev

# 再次执行
$ sudo ./custom_configure.sh 
# 报错
./configure: error: the HTTP image filter module requires the GD library.
You can either do not enable the module or install the libraries.
#解决
sudo apt-get install libgd-dev

# 再次执行
$ sudo ./custom_configure.sh 
# 报错
./configure: error: the GeoIP module requires the GeoIP library.
You can either do not enable the module or install the library.
# 搜索
$ sudo apt-cache search geoip
geoclue-ubuntu-geoip - Provide positioning for GeoClue via Ubuntu GeoIP services
geoip-bin - IP lookup command line tools that use the GeoIP library
geoip-database - IP lookup command line tools that use the GeoIP library (country database)
geoip-dbg - debugging symbols for the GeoIP packages
libgeoip-dev - Development files for the GeoIP library
.....
# 解决
$ sudo apt-install libgeoip-dev

执行后有用的信息，经过这些信息能够知道编译出来的nginx会装到哪里，配置文件会放在哪里，错误日志会放在哪里：

Configuration summary
  + using threads
  + using system PCRE library
  + using system OpenSSL library
  + md5: using OpenSSL library
  + sha1: using OpenSSL library
  + using system zlib library

  nginx path prefix: "/usr/share/nginx"
  nginx binary file: "/usr/share/nginx/sbin/nginx"
  nginx modules path: "/usr/share/nginx/modules"
  nginx configuration prefix: "/etc/nginx"
  nginx configuration file: "/etc/nginx/nginx.conf"
  nginx pid file: "/run/nginx.pid"
  nginx error log file: "/var/log/nginx/error.log"
  nginx http access log file: "/var/log/nginx/access.log"
  nginx http client request body temporary files: "/var/lib/nginx/body"
  nginx http proxy temporary files: "/var/lib/nginx/proxy"
  nginx http fastcgi temporary files: "/var/lib/nginx/fastcgi"
  nginx http uwsgi temporary files: "/var/lib/nginx/uwsgi"
  nginx http scgi temporary files: "/var/lib/nginx/scgi"

中止nginx，并备份原来的nginx执行文件，和配置文件：

$ which nginx
/usr/sbin/nginx
$ sudo cp /usr/sbin/nginx /usr/sbin/nginx_org_bak
$ sudo cp /etc/nginx/nginx.conf /etc/nginx/nginx.conf.bak

继续在nginx-src目录执行make和make install：

$ cd ~/caibh/nginx-src
$ sudo make

# 报错
Fatal error: can't create objs/addon/src/ngx_http_fastdfs_module.o: Permission denied
In file included from /home/xxxx/caibh/fdfs-package/fastdfs-nginx-module-1.20/src/common.c:26:0,
                 from /home/xxxx/caibh/fdfs-package/fastdfs-nginx-module-1.20/src/ngx_http_fastdfs_module.c:6:
/usr/include/fastdfs/fdfs_define.h:15:27: fatal error: common_define.h: No such file or directory

# 解决
# 修改fastdfs-nginx-module的src/config文件
$ cd /home/xxxx/caibh/fdfs-package/fastdfs-nginx-module-1.20/src
$ sudo vi config
# 修改一下两项：
ngx_module_incs="/usr/include/fastdfs /usr/include/fastcommon/"
CORE_INCS="$CORE_INCS /usr/include/fastdfs /usr/include/fastcommon/"

# 从新运行 nginx-src/custom_configure.sh
$ pwd
/home/xxxx/caibh/nginx-src
$ sudo ./custom_configure.sh
$ sudo make
$ sudo make install
# make install 会在/usr/share/nginx/sbin目录下生成一个名为nginx的可执行文件
$ sudo ls /usr/share/nginx
html  sbin

关闭系统原有的nginx，并备份好系统原来的nginx文件：

sudo nginx -s stop
cd /usr/sbin
sudo cp mv /usr/sbin/nginx /usr/sbin/nginx_bak

备份好后建立一个软连接，放在/usr/sbin目录下：

# 检查本身编译出来的nginx可否运行
$ ./nginx -v
nginx version: nginx/1.10.3
# 建立软连接
$ sudo ln -s /usr/share/nginx/sbin/nginx /usr/sbin/nginx

配置nginx，加入路由规则，映射到fastdfs的数据目录：

# config for fastdfs-nginx-module
server {
    listen 8777;
    location /M00 {
        root ~/fdfs/data;
        ngx_fastdfs_module;
    }
}

开放端口：

sudo iptables -A IN_public_allow -p tcp --dport 8777 -j ACCEPT
sudo iptables -L -n

测试上传图片：

$ fdfs_test /etc/fdfs/client.conf upload ~/caibh/test_images/XinXiJuZhiWang.jpg
This is FastDFS client test program v5.11

Copyright (C) 2008, Happy Fish / YuQing

FastDFS may be copied only under the terms of the GNU General
Public License V3, which may be found in the FastDFS source kit.
Please visit the FastDFS Home Page http://www.csource.org/ 
for more detail.

[2019-02-22 14:54:33] DEBUG - base_path=/home/xxxx/fdfs/client, connect_timeout=30, network_timeout=60, tracker_server_count=1, anti_steal_token=0, anti_steal_secret_key length=0, use_connection_pool=0, g_connection_pool_max_idle_time=3600s, use_storage_id=0, storage server id count: 0

tracker_query_storage_store_list_without_group: 
    server 1. group_name=, ip_addr=191.8.2.203, port=23000

group_name=group1, ip_addr=191.8.2.203, port=23000
storage_upload_by_filename
group_name=group1, remote_filename=M00/00/00/vwgCy1xvnKmAIDXDAAEM3XOobI4945.jpg
source ip address: 191.8.2.203
file timestamp=2019-02-22 14:54:33
file size=68829
file crc32=1940417678
example file url: http://191.8.2.203:9270/group1/M00/00/00/vwgCy1xvnKmAIDXDAAEM3XOobI4945.jpg
storage_upload_slave_by_filename
group_name=group1, remote_filename=M00/00/00/vwgCy1xvnKmAIDXDAAEM3XOobI4945_big.jpg
source ip address: 191.8.2.203
file timestamp=2019-02-22 14:54:33
file size=68829
file crc32=1940417678
example file url: http://191.8.2.203:9270/group1/M00/00/00/vwgCy1xvnKmAIDXDAAEM3XOobI4945_big.jpg

访问：

http://191.8.2.203:8777/M00/00/00/vwgCy1xvnKmAIDXDAAEM3XOobI4945_big.jpg
# 若是能看到图片则表示安装fastdfs-nginx-module成功

附录1：FastDFS 官网介绍

FastDFS是一款高性能的分布式文件系统。主要功能包括：文件存储，文件同步，文件访问（上传下载）。它能够解决高容量和负载均衡的问题。FastDFS适合用来作文件相关的网站，如图片分享、视频分享等。

FastDFS有两种角色：tracker和storage。tracker负责文件访问的跟踪和负载均衡。storage负责存储文件，它的功能包括：文件存储、文件同步、提供文件访问接口，storage还负责管理文件的元数据，这些数据是以键值对的形式表示的，如：width=1024，键是“width”，值是“1024”。

tracker和storage能够是一个或多个服务器。在tracker或storage的集群中，任什么时候候均可以从中删除服务器，对线上服务没有任何影响。tracker集群中的服务器是点对点的。

存储服务器以 卷/组 形式组织，以获取高容量。存储系统包括一个或多个卷，卷与卷之间的文件是相互独立的。整个存储系统的总容量等于全部卷的容量之和。一个文件卷包括一个或多个存储服务器，一个卷中的存储服务器之间的文件是同样的。一个文件卷中的服务器会互相备份，且这些服务器之间是负载均衡的。当添加一个存储服务器到一个卷的时候，卷中的文件会自动复制到新的服务器，复制完之后，系统会把新服务器切换到线上，已提供存储服务。

当存储容量不足时，你能够添加一个或多个卷来扩展存储容量。

一个文件的标识包括两部分：卷名和文件名

附录2：FastDFS官方INSTALL文件

step 1. 下载安装 libfastcommon地址：https://github.com/happyfish1...

step 2. 下载安装 FastDFS
解压：

tar xzf FastDFS_v5.08.tar.gz

step 3. 进入FastDFS的目录

cd FastDFS

step 4. 执行make:

./make.sh

step 5. 执行make install

./make.sh install

step 6. 修改tracker和storage的配置文件：

/etc/fdfs/tracker.conf几个重要的配置：

# the tracker server port
port=22122

# the base path to store data and log files
base_path=/home/caibh/fdfs

# which group to upload file
# when store_lookup set to 1, must set store_group to the group name
store_group=group2

# HTTP port on this tracker server
http.server_port=9270

/etc/fdfs/storage.conf几个重要的配置：

# the storage server port
port=23000

# the base path to store data and log files
base_path=/home/caibh/fdfs

# store_path#, based 0, if store_path0 not exists, it's value is base_path
# the paths must be exist
store_path0=/home/caibh/fdfs
#store_path1=/home/caibh/fdfs2

# tracker_server can ocur more than once, and tracker_server format is
#  "host:port", host can be hostname or ip address
# 在同一台机器上配置tracker和storage时，这里若是是127.0.0.1会报错，因此要配置真正的ip地址。
tracker_server=191.8.1.77:22122

# the port of the web server on this storage server
http.server_port=8888

step 7. run server programs

启动tracker：

/usr/bin/fdfs_trackerd /etc/fdfs/tracker.conf restart

in Linux, you can start fdfs_trackerd as a service:

/sbin/service fdfs_trackerd start

启动storage：

/usr/bin/fdfs_storaged /etc/fdfs/storage.conf restart

in Linux, you can start fdfs_storaged as a service:

/sbin/service fdfs_storaged start

step 8. 测试

修改客户端配置文件：

/etc/fdfs/client.conf几个重要的配置：

# the base path to store log files
base_path=/home/caibh/fdfs/client

# tracker_server can ocur more than once, and tracker_server format is
#  "host:port", host can be hostname or ip address
tracker_server=191.8.1.77:22122

#HTTP settings
http.tracker_server_port=9270

run the client test program:

/usr/bin/fdfs_test <client_conf_filename> <operation>
/usr/bin/fdfs_test1 <client_conf_filename> <operation>

例如上传一个图片文件：

caibh@pc:~$ fdfs_test /etc/fdfs/client.conf upload /develop/fastdfs/test_file/LiuLangDiQiu.jpg
This is FastDFS client test program v5.11

Copyright (C) 2008, Happy Fish / YuQing

FastDFS may be copied only under the terms of the GNU General
Public License V3, which may be found in the FastDFS source kit.
Please visit the FastDFS Home Page http://www.csource.org/ 
for more detail.

[2019-02-19 11:32:30] DEBUG - base_path=/home/caibh/fdfs/client, connect_timeout=30, network_timeout=60, tracker_server_count=1, anti_steal_token=0, anti_steal_secret_key length=0, use_connection_pool=0, g_connection_pool_max_idle_time=3600s, use_storage_id=0, storage server id count: 0

tracker_query_storage_store_list_without_group: 
    server 1. group_name=, ip_addr=191.8.1.77, port=23000

group_name=group1, ip_addr=191.8.1.77, port=23000
storage_upload_by_filename
group_name=group1, remote_filename=M00/00/00/vwgBTVxreM6AD-mcAAEE_qeEI2s285.jpg
source ip address: 191.8.1.77
file timestamp=2019-02-19 11:32:30
file size=66814
file crc32=2810454891
example file url: http://191.8.1.77:9270/group1/M00/00/00/vwgBTVxreM6AD-mcAAEE_qeEI2s285.jpg
storage_upload_slave_by_filename
group_name=group1, remote_filename=M00/00/00/vwgBTVxreM6AD-mcAAEE_qeEI2s285_big.jpg
source ip address: 191.8.1.77
file timestamp=2019-02-19 11:32:30
file size=66814
file crc32=2810454891
example file url: http://191.8.1.77:9270/group1/M00/00/00/vwgBTVxreM6AD-mcAAEE_qeEI2s285_big.jpg

step 9. 查看状态

run the monitor program:

/usr/bin/fdfs_monitor <client_conf_filename>
# 如：
caibh@pc:~$ fdfs_monitor /etc/fdfs/storage.conf
[2019-02-19 10:25:09] DEBUG - base_path=/home/caibh/fdfs, connect_timeout=30, network_timeout=60, tracker_server_count=1, anti_steal_token=0, anti_steal_secret_key length=0, use_connection_pool=0, g_connection_pool_max_idle_time=3600s, use_storage_id=0, storage server id count: 0

server_count=1, server_index=0

tracker server is 191.8.1.77:22122

group count: 1

Group 1:
group name = group1
disk total space = 111868 MB
disk free space = 62228 MB
trunk free space = 0 MB
storage server count = 1
active server count = 1
storage server port = 23000
storage HTTP port = 8888
store path count = 1
subdir count per path = 256
current write server index = 0
current trunk file id = 0

    Storage 1:
        id = 191.8.1.77
        ip_addr = 191.8.1.77 (191-8-1-77.user.vivozap.com.br)  ACTIVE
        http domain = 
        version = 5.11
        join time = 2019-02-19 10:22:53
        up time = 2019-02-19 10:22:53
        total storage = 111868 MB
        free storage = 62228 MB
        upload priority = 10
        store_path_count = 1
        subdir_count_per_path = 256
        storage_port = 23000
        storage_http_port = 8888

tracker server config file sample please see conf/tracker.conf

storage server config file sample please see conf/storage.conf

client config file sample please see conf/client.conf

Item detail

1. server common items

item name	type	default	Must
base_path	string		Y
disabled	boolean	false	N
bind_addr	string		N
network_timeout	int	30(s)	N
max_connections	int	256	N
log_level	string	info	N
run_by_group	string		N
run_by_user	string		N
allow_hosts	string	*	N
sync_log_buff_interval	int	10(s)	N
thread_stack_size	string	1M	N

memo:

• base_path is the base path of sub dirs:
  data and logs. base_path must exist and it's sub dirs will
  be automatically created if not exist.
  $base_path/data: store data files
  $base_path/logs: store log files
• log_level is the standard log level as syslog, case insensitive
  emerg: for emergency
  alert
  crit: for critical
  error
  warn: for warning
  notice
  info
  debug
• allow_hosts can ocur more than once, host can be hostname or ip address,
  "*" means match all ip addresses, can use range like this: 10.0.1.[1-15,20]
  or host[01-08,20-25].domain.com, for example:
  allow_hosts=10.0.1.[1-15,20]
  allow_hosts=host[01-08,20-25].domain.com

1. tracker server items

item name	type	default	Must
item name	type	default	Must
port	int	22000	N
store_lookup	int	0	N
store_group	string		N
store_server	int	0	N
store_path	int	0	N
download_server	int	0	N
reserved_storage_space	string	1GB	N

memo:

• the value of store_lookup is:
  0: round robin (default)
  1: specify group
  2: load balance (supported since V1.1)
• store_group is the name of group to store files.
  when store_lookup set to 1(specify group),
  store_group must be set to a specified group name.
• reserved_storage_space is the reserved storage space for system
  or other applications. if the free(available) space of any stoarge
  server in a group <= reserved_storage_space, no file can be uploaded
  to this group (since V1.1)
  bytes unit can be one of follows:
  G or g for gigabyte(GB)
  M or m for megabyte(MB)
  K or k for kilobyte(KB)
  no unit for byte(B)

1. storage server items

item name	type	default	Must
group_name	string		Y
tracker_server	string		Y
port	int	23000	N
heart_beat_interval	int	30(s)	N
stat_report_interval	int	300(s)	N
sync_wait_msec	int	100(ms)	N
sync_interval	int	0(ms)	N
sync_start_time	string	00:00	N
sync_end_time	string	23:59	N
store_path_count	int	1	N
store_path0	string	base_path	N
store_path#	string		N
subdir_count_per_path	int	256	N
check_file_duplicate	boolean	0	N
key_namespace	string		N
keep_alive	boolean	0	N
sync_binlog_buff_interval	int	60s	N

memo:

• tracker_server can ocur more than once, and tracker_server format is "host:port", host can be hostname or ip address.
• store_path#, # for digital, based 0
• check_file_duplicate: when set to true, must work with FastDHT server, more detail please see INSTALL of FastDHT. FastDHT download page: http://code.google.com/p/fast...
• key_namespace: FastDHT key namespace, can't be empty when check_file_duplicate is true. the key namespace should short as possible

附录3：FastDFS Nginx模块官方INSTALL文件

step 1. first install the FastDFS storage server and client library, the FastDFS version should >= 5.11. download address: https://github.com/happyfish1...

step 2. install nginx server
​ FastDFS nginx module test passed with nginx 1.15.1,
​ my nginx installed in /usr/local/nginx

step 3. download FastDFS nginx module source package and unpack it, such as:

cd /home/yuqing
git clone https://github.com/happyfish100/fastdfs

step 4. enter the nginx source dir, compile and install the module, such as:

cd nginx-1.15.1
./configure --add-module=/home/yuqing/fastdfs-nginx-module/src
make; make install

注意: before compile, you can change FDFS_OUTPUT_CHUNK_SIZE and FDFS_MOD_CONF_FILENAME macro in the config file as:
CFLAGS="$CFLAGS -D_FILE_OFFSET_BITS=64 -DFDFS_OUTPUT_CHUNK_SIZE='256*1024' -DFDFS_MOD_CONF_FILENAME='\"/etc/fdfs/mod_fastdfs.conf\"'"

step 5. config the nginx config file such as nginx.conf, add the following lines:

location /M00 {
        root /home/yuqing/fastdfs/data;
        ngx_fastdfs_module;
    }

step 6. 建立软连接 ${fastdfs_base_path}/data/M00 连接到 ${fastdfs_base_path}/data，命令以下：

ln -s /home/yuqing/fastdfs/data  /home/yuqing/fastdfs/data/M00

step 7. change the config file /etc/fdfs/mod_fastdfs.conf, more detail please see it

step 8. 重启nginx：

/usr/local/nginx/sbin/nginx -s stop; /usr/local/nginx/sbin/nginx