使用BitTorrent-Sync实现双机文件双向同步

BitTorrent-Sync是一款基于P2P的分布式文件同步工具，简称btsync，非开源软件但免费使用。本文使用btsync实现两台服务器上的软件双向同步。

安装

直接从官网下载相应的安装包，为了在Linux服务器上安装，使用的是Linux x64版本BitTorrent-Sync_x64.tar.gz。

然后解压到指定的文件夹，即可执行程序。

sudo mkdir -p /usr/local/btsync
sudo chown shenfeng /usr/local/btsync
tar -zxvf BitTorrent-Sync_x64.tar.gz -C /usr/local/btsync/

进入解压后的目录，可以看到3个文件，其中btsync为可执行文件。

$ ls
btsync  LICENSE.TXT  README

执行--help可以查看帮助信息

 ./btsync --help

BitTorrent Sync 2.3 (239)
Usage:
	  btsync [ options ... ]
Options:
	--help                    Print this message
	--config            Use a configuration file
	--storage           Storage path for identity and license
	--identity     Creates user identity
	--license           Apply owner license
	--nodaemon                Do not daemonize
	--dump-sample-config      Print a sample configuration file
	--log               Set log file
	--webui.listen : Set the webui listening interface
	--generate-secret         Generate a read/write key
	--get-ro-secret  Get the read-only key associated to a read/write key

配置

编写启动脚本。

$ sudo vi /etc/init.d/btsync
#!/bin/sh
#
# description: starts and stops the btsync client

CONF=/usr/local/btsync/btsync.cfg
PROC=/usr/local/btsync/btsync
PIDFILE=/usr/local/btsync/btsync.pid

start() {
  PID1=$(pidof btsync)
  if [ -z ${PID1} ]; then
    echo -n "Starting BitTorrent Sync: "
    ${PROC} --config ${CONF}
  else
    echo "BitTorrent Sync is already running at pid:${PID1}"
  fi
  return $?
}  

stop() {
  echo -n "Stopping BitTorrent Sync: "
  PID1=$(pidof btsync)
  if [ ! -z ${PID1} ]; then
    kill -9 ${PID1}
    echo "OK"
  else
    echo "Failed"
  fi
  return $?
}  

status() {
  PID1=$(pidof btsync)
  PID2=$(cat ${PIDFILE})
  echo -n "Checking BitTorrent Sync: "
  if [ ! -z ${PID1} ] && [ "${PID1}" -eq "${PID2}" ]; then
    echo "OK"
  else
    echo "Failed"
  fi
  return $?
}  

case "$1" in
  start)
   start
  ;;
  stop)
    stop
  ;;
  restart)
    stop
    sleep 1
    start
  ;;
  status)
    status
  ;;
  *)
    echo $"Usage: $0 {start|stop|restart|status}"
    exit 2
esac

编写启动配置文件

{
  "device_name": "vm_2",
  "listening_port" : 8889, // 0 - randomize port

  "check_for_updates" : false,
  "use_upnp" : false,

  "storage_path" : "/usr/local/btsync",
  "pid_file" : "/usr/local/btsync/btsync.pid",

  "download_limit" : 0, // 0 - no limit
  "upload_limit" : 0, 

  "webui" :
  {
    "listen" : "0.0.0.0:8888",
    "login" : "admin",
    "password" : "btsync"
  }

  ,
  "folder_rescan_interval" : 1,
  "lan_encrypt_data" : false,
}

启动程序，通过web页面进行登录和后续配置。

$ /etc/init.d/btsync start
Starting BitTorrent Sync: By using this application, you agree to our Privacy Policy, Terms of Use and End User License Agreement.
https://www.getsync.com/legal/privacy
https://www.getsync.com/legal/terms-of-use
https://www.getsync.com/legal/eula

Webui is listening on 0.0.0.0:8888
BitTorrent Sync forked to background. pid = 15002

在浏览器页面登录控制页面，即服务器IP+8888端口。

使用配置文件中的账号密码进行登录。

在启动一台主机上，点击左上角的Add Folder按钮，增加需要同步的目录。

确认打开目录后，会生成该目录的Key，因为需要双向同步，那么选择READ+WRITE的Key。

登录第二台服务器，登录后，点击Add Folder的第三个选项。填入上面复制的Key之后，选择本地用于同步的目录就可以进行同步了。

参考文档