FastDFS Tracker端配置文件詳解及啓動注意事項

今天進行了FastDFS的tracker端的配置，代碼發送如下：

# is this config file disabled
# false for enabled
# true for disabled
disabled=false
#當前配置是否不可用false可用，true不可用

# bind an address of this host
# empty for bind all addresses of this host
bind_addr=
#是否綁定IP如果一個服務器上有多個IP則設置哪個IP可用，如果不設置則不限制

# the tracker server port
port=22122
#端口

# connect timeout in seconds
# default value is 30s
connect_timeout=30
#針對socket套接字函數connect的連接超時時間設置

# network timeout in seconds
# default value is 30s
network_timeout=60
#設置網絡超時，單位秒，發送或接收數據時，如果在超時時間之後依然不能進行，則本次網絡通訊失敗

# the base path to store data and log files
base_path=/home/fdfs
#配置保存根目錄地址，這個目錄必須存在，子目錄將自動創建

# max concurrent connections this server supported
max_connections=256
#最大連接數

# work thread count, should <= max_connections
# default value is 4
# since V2.00

work_threads=1
#工作線程數，通常設置爲CPU數量

# the method of selecting group to upload files
# 0: round robin
# 1: specify group
# 2: load balance, select the max free space group to upload file
store_lookup=2
#上傳組（卷）的方式：0輪詢，1：指定，2：負載平衡（剩餘空間最大選擇）

# which group to upload file
# when store_lookup set to 1, must set store_group to the group name
store_group=group2
#如果上一參數選擇1方式，即制定祖名，當前參數用來設置指定的組，如果選擇其他方式，當前參數無效

# which storage server to upload file
# 0: round robin (default)
# 1: the first server order by ip address
# 2: the first server order by priority (the minimal)
store_server=0
#同組推送方式0.輪詢方式，1.根據ip地址進行排序選擇第一個服務器，2.根據優先級進行排序（優先級由storeServer的配置文件中upload_priority屬性設置）

# which path(means disk or mount point) of the storage server to upload file
# 0: round robin
# 2: load balance, select the max free space path to upload file

store_path=0
#選擇哪個文件目錄進行上傳（一個StroeServer上面可以有多個base_path）0.輪詢，2.剩餘空間最大

# which storage server to download file
# 0: round robin (default)
# 1: the source storage server which the current file uploaded to
download_server=0
#選擇哪個storeServer最爲下載服務器，0.輪詢，1.哪個爲源則哪個下載

# 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.
# 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)
### XX.XX% as ratio such as reserved_storage_space = 10%
reserved_storage_space = 10%
#系統保留空間大小，用來保證系統和其他應用的正常運行

#standard log level as syslog, case insensitive, value list:
### emerg for emergency
### alert
### crit for critical
### error
### warn for warning
### notice
### info
### debug
log_level=info
#日誌級別

#unix group name to run this program,
#not set (empty) means run by the group of current user

run_by_group=
#使用那個系統用戶組運行FastDFS，默認爲啓動線程的用戶組

#unix username to run this program,
#not set (empty) means run by current user
run_by_user=
#使用那個系統用戶運行FastDFS。默認爲啓動線程的用戶

# 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
allow_hosts=*
#設置可以連接當前tracker的IP範圍，包括client和store_server

# sync log buff to disk every interval seconds
# default value is 10 seconds
sync_log_buff_interval = 10
#同步或刷新日誌到本地硬盤的時間間隔，單位：秒

# check storage server alive interval seconds
check_active_interval = 120
#檢測storage_server的存活狀態時間間隔，單位：秒，本參數要大於storage server的心跳包發送間隔一般爲2-3倍

# thread stack size, should >= 64KB
# default value is 64KB
thread_stack_size = 64KB
#tracker server的線程棧大小，要求大於等於64K

# auto adjust when the ip address of the storage server changed
# default value is true
storage_ip_changed_auto_adjust = true
#當storage server的IP發生變化時集羣是否自動調整。只有在storage server進程重啓時才能完成自動調整

# storage sync file max delay seconds
# default value is 86400 seconds (one day)
# since V2.00
storage_sync_file_max_delay = 86400
#存儲服務器之間同步文件的最大延遲時間，缺省爲1天，可以根據實際情況進行調整

# the max time of storage sync a file
# default value is 300 seconds
# since V2.00
storage_sync_file_max_time = 300
#同步一個文件需要消耗的最大時間，缺省爲300秒，即5分鐘

# if use a trunk file to store several small files
# default value is false
# since V3.00
use_trunk_file = false
#是否使用小文件合併存儲特性，缺省關閉，打開時可以減少碎片文件的出現，但同時加大服務器的負載

# the min slot size, should <= 4KB
# default value is 256 bytes
# since V3.00
slot_min_size = 256
#爲trunk file分配的最小字節數，比如一個文件只有16字節，根據當前設置，也會爲其分配256字節

# the max slot size, should > slot_min_size
# store the upload file to trunk file when it's size <=  this value
# default value is 16MB
# since V3.00
slot_max_size = 16MB
#爲trunk file分配的最大字節數，如果文件小於大小則使用trunk方式存儲，當文件大小大於這個數值是直接保存到一個文件中（不採用合併存儲方式）

# the trunk file size, should >= 4MB
# default value is 64MB
# since V3.00
trunk_file_size = 64MB
#trunk file的大小，不建議設置過大

# if create trunk file advancely
# default value is false
# since V3.06
trunk_create_file_advance = false
#是否提前創建好trunk文件，只用當這個參數設置爲true時下面的3個以trunk_create_file開頭的參數將不用設置

# the time base to create trunk file
# the time format: HH:MM
# default value is 02:00
# since V3.06
trunk_create_file_time_base = 02:00
#創建trunk file的起始時間點，當前爲凌晨2點開始

# the interval of create trunk file, unit: second
# default value is 38400 (one day)
# since V3.06
trunk_create_file_interval = 86400
#提前創建trunk file的時間間隔，默認爲1天

# the threshold to create trunk file
# when the free trunk file size less than the threshold, will create
# the trunk files
# default value is 0
# since V3.06
trunk_create_file_space_threshold = 20G
#提前創建trunk file時，需要達到的空閒trunk大小
#例如：當前配置爲20G，現在空閒的trunk file大小爲4G，那麼只創建16G的trunk file

# if check trunk space occupying when loading trunk free spaces
# the occupied spaces will be ignored
# default value is false
# since V3.09
# NOTICE: set this parameter to true will slow the loading of trunk spaces
# when startup. you should set this parameter to true when neccessary.
trunk_init_check_occupying = false
#trunk file 初始化時，是否檢查可用空間是否被佔用

# if ignore storage_trunk.dat, reload from trunk binlog
# default value is false
# since V3.10
# set to true once for version upgrade when your version less than V3.10
trunk_init_reload_from_binlog = false
#是否無條件從trunk binlog中加載trunk可用空間信息

# if use storage ID instead of IP address
# default value is false
# since V4.00
use_storage_id = false
#是否使用 serverID作爲storage server標識

# specify storage ids filename, can use relative or absolute path
# since V4.00
storage_ids_filename = storage_ids.conf
#use_storage_id設置爲true，才需要設置本參數，詳見源碼目錄下的conf/storage_ids.conf
#這個文件中設置組名、serverID和對應的IP地址

# id type of the storage server in the filename, values are:
## ip: the ip address of the storage server
## id: the server id of the storage server
# this paramter is valid only when use_storage_id set to true
# default value is ip
# since V4.03
id_type_in_filename = ip
#use_storage_id設置爲true時才需要設置本參數


# if store slave file use symbol link
# default value is false
# since V4.01
store_slave_file_use_link = false
#存儲從文件是否採用symbol link（符號鏈接）方式
#如果設置爲true，一個從文件將佔用兩個文件：原始文件及指向它的符號鏈接

# if rotate the error log every day
# default value is false
# since V4.02
rotate_error_log = false
#是否定期輪轉error log，目前僅支持一天輪轉一次

# rotate error log time base, time format: Hour:Minute
# Hour from 0 to 23, Minute from 0 to 59
# default value is 00:00
# since V4.02
error_log_rotate_time=00:00
#error log定期輪轉的時間節點，rotate_error_log參數設置爲true時，本參數有效

# rotate error log when the log file exceeds this size
# 0 means never rotates log file by log file size
# default value is 0
# since V4.02
rotate_error_log_size = 0
#error log按大小進行輪轉 0代表不按大小進行輪轉，否則當error log文件達到大小則輪轉

# if use connection pool
# default value is false
# since V4.05
use_connection_pool = false
#是否使用連接池

# connections whose the idle time exceeds this time will be closed
# unit: second
# default value is 3600
# since V4.05
connection_pool_max_idle_time = 3600
#連接池鏈接的最大生存時間，單位秒，use_connection_pool設置爲true時有效

# HTTP port on this tracker server
http.server_port=8080
#http服務端口，默認情況下V4.06是不安裝http服務的，詳見INSTALL文件


# check storage HTTP server alive interval seconds
# <= 0 for never check
# default value is 30
http.check_alive_interval=30
#檢查長鏈接的存活時間30秒

# check storage HTTP server alive type, values are:
#   tcp : connect to the storge server with HTTP port only,
#        do not request and get response
#   http: storage check alive url must return http status 200
# default value is tcp
http.check_alive_type=tcp
#長鏈接的存在方式，當前配置爲tcp方式

# check storage HTTP server alive uri/url
# NOTE: storage embed HTTP server support uri: /status.html
http.check_alive_uri=/status.html
#利用什麼標識進行檢查

附件中有保存好的traker.conf文件，需要的可以進行下載
配置完成之後，運行

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

tracker端就可以運行成功了。
可能出現的問題有兩個
1.base_path設置的目錄不存在，如果報這個錯誤，需要按base_path的設置創建一個目錄
2.找不到libevent-2.0.so.5
如果找不到這個，請確認安裝時的安裝位置
一般這個庫會安裝到/usr/local/lib中
而我們的fdfs_trackerd會到/usr/lib中去查找，所以使用

ln -s /usr/local/lib/libevent-2.0.so.5 /usr/lib/libevent-2.0.so.5

將庫加載到/usr/lib中就可以了