一、FastDFS简介
一、FastDFS简介
FastDFS是由国人余庆所开发，其项目地址：https://github.com/happyfish100
FastDFS是一个轻量级的开源分布式文件系统，主要解决了大容量的文件存储和高并发访问的问题，文件存取时实现了负载均衡。
支持存储服务器在线扩容,支持相同的文件只保存一份,节约磁盘。
FastDFS只能通过Client API访问，不支持POSIX访问方式。
FastDFS适合中大型网站使用，用来存储资源文件(如：图片、文档、视频等)
二、FastDFS组成部分及其它名词
1、tracker server
跟踪服务器：用来调度来自客户端的请求。且在内存中记录所有存储组和存储服务器的信息状态。
2、storage server
存储服务器：用来存储文件(data)和文件属性(metadata)
3、client
客户端：业务请求发起方，通过专用接口基于TCP协议与tracker以及storage server进行交互
group
组，也可称为卷：同组内上的文件是完全相同的
文件标识
包括两部分：组名和文件名(包含路径)
meta data
文件相关属性：键值对(Key Value Pair)方式
fid
文件标识符：
例如： group1/M00/00/00/CgEOxVegXB2AdYafAAAB0b8tBbQ9155303 group_name：存储组的组名；上传完成后，需要客户端自行保存 M##：服务器配置的虚拟路径，与磁盘选项store_path#对应
两级以两位16进制数字命名的目录 文件名：与原文件名并不相同；由storage server根据特定信息生成。文件名包含：源存储服务器的IP地址、文件创建时间戳、文件大小、随机数和文件扩展名等
三、FastDFS同步机制
1、同一组内的storage server之间是对等的，文件上传、删除等操作可以在任意一台storage server上进行；
2、文件同步只在同组内的storage server之间进行，采用push方式，即源服务器同步给目标服务器；
3、源头数据才需要同步，备份数据不需要再次同步，否则就构成环路了；
上述第二条规则有个例外，就是新增加一台storage server时，由已有的一台storage server将已有的所有数据（包括源头数据和备份数据）同步给该新增服务器。
四、FastDFS与集中存储方式对比
五、FastDFS和mogileFS对比
六、FastDFS安装配置
1、安装开发环境
# yum groupinstall "Development Tools" "Server platform Development"
2、安装libfastcommon
# git clone https://github.com/happyfish100/libfastcommon.git
# cd libfastcommon/
# ./make.sh
# ./make.sh install
3、安装fastdfs
# cd /root/
# git clone https://github.com/happyfish100/fastdfs.git
# cd fastdfs/
# ./make.sh
# ./make.sh install
tracker 配置
配置文件修改：根据需求修改
# cd /etc/fdfs
# cp tracker.conf.sample tracker.conf
# vim /etc/fdfs/tracker.conf
base_path=/data/fdfs/tracker # 存储日志及tracker的状态信息
启动服务（Centos6）：
# mkdir -pv /data/fdfs/tracker
# service fdfs_trackerd start
启动服务（Centos7）方式一：
# mkdir -pv /data/fdfs/tracker
# /etc/init.d/fdfs_trackerd start
启动服务（Centos7）方式二：
添加systemd的units文件
# cat > /usr/lib/systemd/system/fdfs_trackerd << EOF
# Systemd unit file for default tomcat
#
[Unit]
Description=FastDFS tracker script
After=syslog.target network.target
[Service]
Type=notify
ExecStart=/usr/bin/fdfs_trackerd /etc/fdfs/tracker.conf
[Install]
WantedBy=multi-user.target
EOF
通过systemd启动
systemctl start fdfs_trackerd.service
# ss -tnl|grep 22122
LISTEN 0 128 *:22122 *:*
/usr/bin/fdfs_trackerd /etc/fdfs/tracker.conf start
storage 配置
根据需求修改
# cd /etc/fdfs
# cp storage.conf.sample storage.conf
# vim /etc/fdfs/storage.conf
group_name=group1 #指定组名
base_path=/data/fdfs/storage # 用于存储数据
store_path_count=2 # 设置设备数量
store_path0=/data/fdfs/storage/m0 #指定存储路径0
store_path1=/data/fdfs/storage/m1 #指定存储路径1
# 注意：同一组内存储路径不能冲突，例如：下一个节点的存储路径就是m2,m3....等
tracker_server=10.1.14.197:22122 #指定tracker
启动服务（Centos6）：
# mkdir -pv /data/fdfs/storage/{m0,m1} # 创建数据目录
# service fdfs_storaged start
启动服务（Centos7）方式一：
# mkdir -pv /data/fdfs/storage/{m0,m1} # 创建数据目录
# /etc/init.d/fdfs_storaged start
启动服务（Centos7）方式二：
添加systemd的units文件
# mkdir -pv /data/fdfs/storage/{m0,m1} # 创建数据目录
# cat > /usr/lib/systemd/system/fdfs_trackerd << EOF
# Systemd unit file for default fastdfs storage
#
[Unit]
Description=FastDFS storage script
After=syslog.target network.target
[Service]
Type=notify
ExecStart=/usr/bin/fdfs_storaged /etc/fdfs/storage.conf
[Install]
WantedBy=multi-user.target
EOF
通过systemd启动
systemctl start fdfs_storaged.service
# ss -tnl|grep 23000
LISTEN 0 128 *:23000 *:*
client配置
修改客户端配置文件
base_path=/data/fdfs/client
tracker_server=10.1.14.197:22122
七、测试FastDFS
1、上传文件
fdfs_upload_file [storage_ip:port] [store_path_index]
# fdfs_upload_file /etc/fdfs/client.conf /etc/issue
group1/M00/00/00/CgEOxVeMxeuABKiEAAAAF30Ccq85795930
2、查看文件
fdfs_file_info
# fdfs_file_info /etc/fdfs/client.conf group1/M00/00/00/CgEOxVeMxeuABKiEAAAAF30Ccq85795930
source storage id: 0
source ip address: 10.1.14.198
file create timestamp: 2016-07-18 20:04:59
file size: 23
file crc32: 2097312431 (0x7D0272AF)
3、下载文件
fdfs_download_file [local_filename] [ ]
# fdfs_download_file /etc/fdfs/client.conf group1/M00/00/00/CgEOxVeMxeuABKiEAAAAF30Ccq85795930 /tmp/issue
4、查看存储节点状态
# fdfs_monitor /etc/fdfs/client.conf
[2016-08-03 11:58:20] DEBUG - base_path=/data/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
server_count=1, server_index=0
tracker server is 10.1.14.197:22122
group count: 1
Group 1:
group name = mage1
disk total space = 18898 MB
disk free space = 17222 MB
trunk free space = 0 MB
storage server count = 2
active server count = 2
storage server port = 23000
storage HTTP port = 8888
store path count = 1
subdir count per path = 256
current write server index = 1
current trunk file id = 0
Storage 1:
id = 10.1.14.198
ip_addr = 10.1.14.198 ACTIVE
http domain =
version = 5.08
join time = 2016-08-03 20:40:46
up time = 2016-08-03 11:58:16
total storage = 18898 MB
free storage = 17222 MB
upload priority = 10
store_path_count = 1
subdir_count_per_path = 256
storage_port = 23000
storage_http_port = 8888
current_write_path = 0
source storage id =
if_trunk_server = 0
connection.alloc_count = 256
connection.current_count = 0
connection.max_count = 0
total_upload_count = 1
success_upload_count = 1
total_append_count = 0
success_append_count = 0
total_modify_count = 0
success_modify_count = 0
total_truncate_count = 0
success_truncate_count = 0
total_set_meta_count = 0
success_set_meta_count = 0
total_delete_count = 0
success_delete_count = 0
total_download_count = 0
success_download_count = 0
total_get_meta_count = 0
success_get_meta_count = 0
total_create_link_count = 0
success_create_link_count = 0
total_delete_link_count = 0
success_delete_link_count = 0
total_upload_bytes = 23
success_upload_bytes = 23
total_append_bytes = 0
success_append_bytes = 0
total_modify_bytes = 0
success_modify_bytes = 0
stotal_download_bytes = 0
success_download_bytes = 0
total_sync_in_bytes = 0
success_sync_in_bytes = 0
total_sync_out_bytes = 0
success_sync_out_bytes = 0
total_file_open_count = 1
success_file_open_count = 1
total_file_read_count = 0
success_file_read_count = 0
total_file_write_count = 1
success_file_write_count = 1
last_heart_beat_time = 2016-08-03 11:58:15
last_source_update = 2016-08-03