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:: Purpose:         DHCP server Watchdog & Failover script. Read notes below
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:: Requirements:    1. Domain administrator credentials & "Logon as a batch job" rights
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::                  2. Proper firewall configuration to allow connection
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::                  3. Proper permissions on the DHCP backup directory
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:: Author:          vocatus on Reddit
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:: Author:          vocatus on reddit.com/r/usefulscripts
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:: Version:         1.1c + Added quotes around all variables that could contain paths
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:: Version:         1.2  + Added functionality to recover the DHCP database BACK to the primary server after a failure. Now when the backup server detects that
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::                         the primary server has come back online after an outage, it will export its current copy of the DHCP database, upload it back to the
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::                         primary server, import it, and spin it back up using the most recent copy. This addresses the issue of new leases being passed out during
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::                         an outage of the primary server and it not being aware of those leases when it comes back online.
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::                       + Added "REMOTE_OPERATIING_PATH" variable that lets us specify where the remote server keeps its DHCP working files during operation
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::                       + Added "UPDATED" variable to note when the script was last updated
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::                  1.1c + Added quotes around all variables that could contain paths
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::                       + Added full path to SC.exe to prevent failure in the event %PATH% gets corrupted or mangled (this happened in testing)
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::                       * Fixed a glitch that could occur when pinging an assumed-down primary server that would incorrectly think it was back up
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::                       - Removed almost every entry of "2>&1" since it's really not needed
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::                  1.1b - Changed DATE to CUR_DATE format to be consistent with all other scripts
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::                  1.1  - Comments improvement
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::                       / Tuned some parameters (ping count on checking)
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::                       / Some logging tweaks
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::                       / Renamed FAILOVER_DELAY to FAILOVER_RECHECK_DELAY for clarity
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::                  1.0d * Some logging tweaks
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::                  1.0c * Some logging tweaks
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::                  1.0 Initial write
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:: Notes:           I wrote this script after failing to find a satisfactory method of performing
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::                  watchdog/failover between two Windows Server 2008 R2 DHCP servers.
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::
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:: Use:             This script has two modes: "Watchdog" and "Failover."
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::                  - Watchdog checks the status of the remote DHCP service, logs it, and then grabs the remote DHCP db backup file and imports it.
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::                  - Failover mode is activated when the script cannot determine the status of the remote DHCP server. The script then activates
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::                    the local DHCP server with the latest backup copy it successfully retrieved from the primary server.
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::
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:: Instructions:
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::                  1. Tune the variables in this script to your desired backup location and frequency
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::                  2. On the primary server: set the DHCP backup interval to your desired backup frequency. The value is in minutes; I recommend 5 minutes.
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::                     You do this by modifying this registry key: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\DHCPServer\Parameters\BackupInterval
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::                  3. On the backup server:  set this script to run as a scheduled task. I recommend every 10 minutes.
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:: Notice:
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::                 !! Make sure to set it only to run if it isn't already running! If there is a failover you could have
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::                    Task Scheduler spawn a new instance of the script every n minutes and end up with hundreds of copies
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::                    of this script running.
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set VERSION=1.1c
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43
:: Prep

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SETLOCAL

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@echo off

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cls

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set VERSION=1.2

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set UPDATED=2013-09-09

49
title [DHCP Server Watchdog v%VERSION%]

50-
set REMOTE_SERVER=my-dhcp-server

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51
52-
:: Location of the DHCP backup on the remote primary server

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53-
:: Best practice is to leave as default, unless you have a custom backup location.

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:::::::::::::::

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56
:: Remote server is the PRIMARY DHCP server we're watching. Use a hostname or IP address.

57-
:: Location of the local backup. I normally copy directly to my backup server's DHCP directory. 

57+
set REMOTE_SERVER=MY-DHCP-SERVER

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59
:: Location of the automatic DHCP backup file on the primary server. Windows generates this automatically.

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:: Best practice is to leave this alone, unless you have a custom backup location.

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:: The script builds the backup line like this: \\%REMOTE_SERVER%\c$\%REMOTE_BACKUP_PATH%

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set REMOTE_BACKUP_PATH=Windows\system32\dhcp\backup

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:: Location of the operational DHCP database files on the remote (primary) server.

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:: Best practice is to leave this alone, unless you have a custom location. Changing this will break the 

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:: function that re-uploads the most current db back to the primary server after a failure. This doesn't 

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:: ruin the script, but if the backup server passed out any IP's while the primary server was down, the 

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:: primary server won't know about them when it comes back up.

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set REMOTE_OPERATING_PATH=Windows\system32\dhcp

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set LOG_MAX_SIZE=2097152

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:: Location of your backup/standby file. I normally copy directly to my backup server's DHCP directory. 

72
:: The script builds the local backup line like this: c:\windows\system32\dhcp\[backup folders]

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set LOCAL_BACKUP_PATH=%SystemRoot%\system32\dhcp

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75
:: When a failover is triggered, how many seconds should we wait in between each attempt to contact the primary server again?

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set FAILOVER_RECHECK_DELAY=15

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:: Log options. Don't put an extension on the log file name. (Important!) The script sets this later on.

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set LOGPATH=%SystemDrive%\Logs

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set LOGFILE=%COMPUTERNAME%_DHCP_watchdog

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:: Max log file size allowed (in bytes) before rotation and archive. I recommend setting this to 2 MB (2097152).

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:: Example: 524288 is half a megabyte (~500KB)

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set LOG_MAX_SIZE=10485760

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:: \/ Don't touch anything below this line. If you do, you will break something.

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set CUR_DATE=%DATE:~-4%-%DATE:~4,2%-%DATE:~7,2%

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:::::::::::::::::::::::

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:: LOG FILE HANDLING :: - This section handles the log file

92
:::::::::::::::::::::::

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:: Make the logfile if it doesn't exist

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if not exist %LOGPATH% mkdir %LOGPATH%

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if not exist %LOGPATH%\%LOGFILE%.log goto new_log

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:: Check log size. If it hasn't exceeded our size limit, jump straight to Watchdog mode

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for %%R in (%LOGPATH%\%LOGFILE%.log) do if %%~zR LSS %LOG_MAX_SIZE% goto newrun

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:: However, if the log was too big, go ahead and rotate it.

102
pushd %LOGPATH%

103
del %LOGFILE%.ancient 2>NUL

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rename %LOGFILE%.oldest %LOGFILE%.ancient 2>NUL

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rename %LOGFILE%.older %LOGFILE%.oldest 2>NUL

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rename %LOGFILE%.old %LOGFILE%.older 2>NUL

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rename %LOGFILE%.log %LOGFILE%.old 2>NUL

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popd

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110
:: And then create the header for the new log file

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:new_log

112
echo ------------------------------------------------------------------------------------->> %LOGPATH%\%LOGFILE%.log

113
echo  Initializing new DHCP Server Watchdog log on %CUR_DATE% at %TIME%, max log size %LOG_MAX_SIZE% bytes>> %LOGPATH%\%LOGFILE%.log

114
echo ------------------------------------------------------------------------------------->> %LOGPATH%\%LOGFILE%.log

115
echo.>> %LOGPATH%\%LOGFILE%.log

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echo %TIME%         Starting Watchdog mode.>> %LOGPATH%\%LOGFILE%.log

116+
117
:: New run section - if we just launched the script, write a header for this run

118
:newrun

119
echo ------------------------------------------------------------------------------------->> %LOGPATH%\%LOGFILE%.log

120
echo  DHCP Server Watchdog v%VERSION%, %CUR_DATE%>> %LOGPATH%\%LOGFILE%.log

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echo   Running as %USERDOMAIN%\%USERNAME% on %COMPUTERNAME%>> %LOGPATH%\%LOGFILE%.log

122
echo.>> %LOGPATH%\%LOGFILE%.log

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echo  Job Options>> %LOGPATH%\%LOGFILE%.log

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echo   Log location:            %LOGPATH%\%LOGFILE%.log>> %LOGPATH%\%LOGFILE%.log

125
echo   Log max size:            %LOG_MAX_SIZE% bytes>> %LOGPATH%\%LOGFILE%.log

126
echo   Watching primary server: %REMOTE_SERVER%>> %LOGPATH%\%LOGFILE%.log

127
echo   Mirroring this DHCP db:  %REMOTE_BACKUP_PATH%>> %LOGPATH%\%LOGFILE%.log

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echo   Local backup location:   %LOCAL_BACKUP_PATH%>> %LOGPATH%\%LOGFILE%.log

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echo ------------------------------------------------------------------------------------->> %LOGPATH%\%LOGFILE%.log

130
echo %CUR_DATE% %TIME%         Starting Watchdog mode.>> %LOGPATH%\%LOGFILE%.log

131
echo.

132
echo  DHCP Server Watchdog v%VERSION%

133-
echo %TIME%         Pinging %REMOTE_SERVER%...>> %LOGPATH%\%LOGFILE%.log

133+
134-
echo %TIME%         Pinging %REMOTE_SERVER%...

134+
135-
ping %REMOTE_SERVER% -n 2 >NUL

135+
136-
if %ERRORLEVEL%==1 echo %TIME% WARNING %REMOTE_SERVER% failed to respond to ping. && echo %TIME% WARNING %REMOTE_SERVER% failed to respond to ping.>> %LOGPATH%\%LOGFILE%.log

136+
137-
if not %ERRORLEVEL%==1 echo %TIME% SUCCESS %REMOTE_SERVER% responded to ping. && echo %TIME% SUCCESS %REMOTE_SERVER% responded to ping.>> %LOGPATH%\%LOGFILE%.log

137+
138
:: WATCHDOG MODE ::

139
:::::::::::::::::::

140-
echo %TIME%         Checking DHCP server status on %REMOTE_SERVER%...>> %LOGPATH%\%LOGFILE%.log

140+
141-
echo %TIME%         Checking DHCP server status on %REMOTE_SERVER%...

141+
142
:: Ping the server to see if it's up

143
echo.

144
echo   Verifying proper operation of DHCP server on %REMOTE_SERVER%, please wait...

145
echo.

146
echo %CUR_DATE% %TIME%         Pinging %REMOTE_SERVER%...>> %LOGPATH%\%LOGFILE%.log

147
echo %CUR_DATE% %TIME%         Pinging %REMOTE_SERVER%...

148-
if %ERRORLEVEL%==0 echo %TIME% SUCCESS The DHCP service is running on %REMOTE_SERVER%.>> %LOGPATH%\%LOGFILE%.log

148+
ping %REMOTE_SERVER% -n %FAILOVER_RECHECK_DELAY% >NUL

149-
if %ERRORLEVEL%==0 echo %TIME% SUCCESS The DHCP service is running on %REMOTE_SERVER%.

149+
if %ERRORLEVEL%==1 echo %CUR_DATE% %TIME% WARNING %REMOTE_SERVER% failed to respond to ping. && echo %CUR_DATE% %TIME% WARNING %REMOTE_SERVER% failed to respond to ping.>> %LOGPATH%\%LOGFILE%.log

150
if not %ERRORLEVEL%==1 echo %CUR_DATE% %TIME% SUCCESS %REMOTE_SERVER% responded to ping. && echo %CUR_DATE% %TIME% SUCCESS %REMOTE_SERVER% responded to ping.>> %LOGPATH%\%LOGFILE%.log

151
152
:: Check & Log

153-
	echo %TIME% FAILURE The DHCP service is not running on %REMOTE_SERVER%.>> %LOGPATH%\%LOGFILE%.log

153+
echo %CUR_DATE% %TIME%         Checking DHCP server status on %REMOTE_SERVER%...>> %LOGPATH%\%LOGFILE%.log

154-
	echo %TIME%         Activating failover procedure. Local DHCP server will be initialized using most recent successful backup.>> %LOGPATH%\%LOGFILE%.log

154+
echo %CUR_DATE% %TIME%         Checking DHCP server status on %REMOTE_SERVER%...

155-
	echo %TIME% FAILURE The DHCP service is not running on %REMOTE_SERVER%.

155+
156-
	echo %TIME%         Activating failover procedure. Local DHCP server will be initialized using most recent successful backup.

156+
157
ver > NUL

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159
:: Use "SC" to check the status of "Dhcpserver" service, find the "RUNNING" state, and act accordingly based on the return code

160
%WINDIR%\System32\sc.exe \\%REMOTE_SERVER% query Dhcpserver | find "RUNNING" >NUL

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if %ERRORLEVEL%==0 echo %CUR_DATE% %TIME% SUCCESS The DHCP service is running on %REMOTE_SERVER%.>> %LOGPATH%\%LOGFILE%.log

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if %ERRORLEVEL%==0 echo %CUR_DATE% %TIME% SUCCESS The DHCP service is running on %REMOTE_SERVER%.

163
164-
echo %TIME%         Fetching DHCP database backup from %REMOTE_SERVER%...>> %LOGPATH%\%LOGFILE%.log

164+
165-
echo %TIME%         Fetching DHCP database backup from %REMOTE_SERVER%...

165+
166
	echo %CUR_DATE% %TIME% FAILURE The DHCP service is not running on %REMOTE_SERVER%.>> %LOGPATH%\%LOGFILE%.log

167
	echo %CUR_DATE% %TIME%         Activating failover procedure. Local DHCP server will be initialized using most recent successful backup.>> %LOGPATH%\%LOGFILE%.log

168
	echo %CUR_DATE% %TIME% FAILURE The DHCP service is not running on %REMOTE_SERVER%.

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	echo %CUR_DATE% %TIME%         Activating failover procedure. Local DHCP server will be initialized using most recent successful backup.

170-
	echo %TIME% SUCCESS Backup fetched from %REMOTE_SERVER%.>> %LOGPATH%\%LOGFILE%.log

170+
171-
	echo %TIME% SUCCESS Backup fetched from %REMOTE_SERVER%.

171+
172-
	echo %TIME%         Rotating database backups...>> %LOGPATH%\%LOGFILE%.log

172+
173-
	echo %TIME%         Rotating database backups...

173+
174
ver > NUL

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:: Fetch

177
echo %CUR_DATE% %TIME%         Fetching DHCP database backup from %REMOTE_SERVER%...>> %LOGPATH%\%LOGFILE%.log

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echo %CUR_DATE% %TIME%         Fetching DHCP database backup from %REMOTE_SERVER%...

179
xcopy "\\%REMOTE_SERVER%\c$\%REMOTE_BACKUP_PATH%\*" "%LOCAL_BACKUP_PATH%\backup_new_pending\" /E /Y /Q >NUL

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181-
	echo %TIME%         Database backups rotated.>> %LOGPATH%\%LOGFILE%.log

181+
182-
	echo %TIME%         Database backups rotated.

182+
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	echo %CUR_DATE% %TIME% SUCCESS Backup fetched from %REMOTE_SERVER%.>> %LOGPATH%\%LOGFILE%.log

184
	echo %CUR_DATE% %TIME% SUCCESS Backup fetched from %REMOTE_SERVER%.

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	echo %CUR_DATE% %TIME%         Rotating database backups...>> %LOGPATH%\%LOGFILE%.log

186
	echo %CUR_DATE% %TIME%         Rotating database backups...

187-
	echo %TIME% WARNING There was an error copying the backup from %REMOTE_SERVER%.>> %LOGPATH%\%LOGFILE%.log

187+
188-
	echo %TIME%         You may want to look into this since we were able to check the DHCPserver service status but the file copy failed.>> %LOGPATH%\%LOGFILE%.log

188+
189-
	echo %TIME%         Skipping new database import due to copy failure.>> %LOGPATH%\%LOGFILE%.log

189+
190-
	echo %TIME%         Job complete with errors.>> %LOGPATH%\%LOGFILE%.log

190+
191-
	echo %TIME% WARNING There was an error copying the backup from %REMOTE_SERVER%.

191+
192-
	echo %TIME%         You may want to look into this since we were able to check the DHCPserver service status but the file copy failed.

192+
193-
	echo %TIME%         Skipping new database import due to copy failure.

193+
194-
	echo %TIME%         Job complete with errors.

194+
	echo %CUR_DATE% %TIME%         Database backups rotated.>> %LOGPATH%\%LOGFILE%.log

195
	echo %CUR_DATE% %TIME%         Database backups rotated.

196
	)

197
198-
echo %TIME%         Starting local DHCP server to import new database...>> %LOGPATH%\%LOGFILE%.log

198+
199-
echo %TIME%         Starting local DHCP server to import new database...

199+
200
	echo %CUR_DATE% %TIME% WARNING There was an error copying the backup from %REMOTE_SERVER%.>> %LOGPATH%\%LOGFILE%.log

201-
echo %TIME%         Local DHCP server running. Performing import...>> %LOGPATH%\%LOGFILE%.log

201+
	echo %CUR_DATE% %TIME%         You may want to look into this since we were able to check the DHCPserver service status but the file copy failed.>> %LOGPATH%\%LOGFILE%.log

202-
echo %TIME%         Local DHCP server running. Performing import...

202+
	echo %CUR_DATE% %TIME%         Skipping new database import due to copy failure.>> %LOGPATH%\%LOGFILE%.log

203
	echo %CUR_DATE% %TIME%         Job complete with errors.>> %LOGPATH%\%LOGFILE%.log

204-
echo %TIME%         Import complete.>> %LOGPATH%\%LOGFILE%.log

204+
	echo %CUR_DATE% %TIME% WARNING There was an error copying the backup from %REMOTE_SERVER%.

205-
echo %TIME%         Import complete.

205+
	echo %CUR_DATE% %TIME%         You may want to look into this since we were able to check the DHCPserver service status but the file copy failed.

206-
echo %TIME%         Stopping local DHCP server...>> %LOGPATH%\%LOGFILE%.log

206+
	echo %CUR_DATE% %TIME%         Skipping new database import due to copy failure.

207-
echo %TIME%         Stopping local DHCP server...

207+
	echo %CUR_DATE% %TIME%         Job complete with errors.

208-
	net stop Dhcpserver

208+
209-
echo %TIME%         Local DHCP server stopped.>> %LOGPATH%\%LOGFILE%.log

209+
210-
echo %TIME%         Local DHCP server stopped.

210+
211-
echo %TIME% SUCCESS Job complete, DHCP database backed up and ready for use. Exiting.>> %LOGPATH%\%LOGFILE%.log

211+
echo %CUR_DATE% %TIME%         Starting local DHCP server to import new database...>> %LOGPATH%\%LOGFILE%.log

212-
echo %TIME% SUCCESS Job complete, DHCP database backed up and ready for use. Exiting.

212+
echo %CUR_DATE% %TIME%         Starting local DHCP server to import new database...

213
	net start Dhcpserver

214
echo %CUR_DATE% %TIME%         Local DHCP server running. Performing import...>> %LOGPATH%\%LOGFILE%.log

215
echo %CUR_DATE% %TIME%         Local DHCP server running. Performing import...

216
	netsh dhcp server restore "%LOCAL_BACKUP_PATH%\backup"

217
echo %CUR_DATE% %TIME%         Import complete.>> %LOGPATH%\%LOGFILE%.log

218
echo %CUR_DATE% %TIME%         Import complete.

219
echo %CUR_DATE% %TIME%         Stopping local DHCP server...>> %LOGPATH%\%LOGFILE%.log

220
echo %CUR_DATE% %TIME%         Stopping local DHCP server...

221
	sc stop Dhcpserver

222-
echo %TIME% WARNING Failover activated.>> %LOGPATH%\%LOGFILE%.log

222+
echo %CUR_DATE% %TIME%         Local DHCP server stopped.>> %LOGPATH%\%LOGFILE%.log

223-
echo %TIME%         Starting local DHCP server using most recent successful backup...>> %LOGPATH%\%LOGFILE%.log

223+
echo %CUR_DATE% %TIME%         Local DHCP server stopped.

224
echo %CUR_DATE% %TIME% SUCCESS Job complete, DHCP database backed up and ready for use. Exiting.>> %LOGPATH%\%LOGFILE%.log

225-
echo %TIME% WARNING Could not contact primary DHCP server "%REMOTE_SERVER%." Failover activated.

225+
echo %CUR_DATE% %TIME% SUCCESS Job complete, DHCP database backed up and ready for use. Exiting.

226-
echo %TIME%         Starting local DHCP server using most recent successful backup...

226+
227
228
229-
echo %TIME%         Local DHCP server started.>> %LOGPATH%\%LOGFILE%.log

229+
230-
echo %TIME%         Entering monitoring loop. Checking if %REMOTE_SERVER% is back up every %FAILOVER_RECHECK_DELAY% seconds...>> %LOGPATH%\%LOGFILE%.log

230+
231-
echo %TIME%         Local DHCP server started.

231+
232-
echo %TIME%         Entering monitoring loop. Checking if %REMOTE_SERVER% is back up every %FAILOVER_RECHECK_DELAY% seconds...

232+
233
:failover

234
:: Log this AND display to console

235
echo %CUR_DATE% %TIME% WARNING Failover activated.>> %LOGPATH%\%LOGFILE%.log

236
echo %CUR_DATE% %TIME%         Starting local DHCP server using most recent successful backup...>> %LOGPATH%\%LOGFILE%.log

237-
ping %REMOTE_SERVER% -n 3 >NUL

237+
238
echo %CUR_DATE% %TIME% WARNING Could not contact primary DHCP server %REMOTE_SERVER%. Failover activated.

239
echo %CUR_DATE% %TIME%         Starting local DHCP server using most recent successful backup...

240-
	echo %TIME% FAILURE No ping response from %REMOTE_SERVER%. Waiting %FAILOVER_RECHECK_DELAY% seconds to check again.>> %LOGPATH%\%LOGFILE%.log

240+
241-
	echo %TIME% FAILURE No ping response from %REMOTE_SERVER%. Waiting %FAILOVER_RECHECK_DELAY% seconds to check again.

241+
242
echo %CUR_DATE% %TIME%         Local DHCP server started.>> %LOGPATH%\%LOGFILE%.log

243
echo %CUR_DATE% %TIME%         Entering monitoring loop. Checking if %REMOTE_SERVER% is back up every %FAILOVER_RECHECK_DELAY% seconds...>> %LOGPATH%\%LOGFILE%.log

244
echo %CUR_DATE% %TIME%         Local DHCP server started.

245
echo %CUR_DATE% %TIME%         Entering monitoring loop. Checking if %REMOTE_SERVER% is back up every %FAILOVER_RECHECK_DELAY% seconds...

246
247
248
:failover_loop

249
:: First we ping the server

250-
	echo %TIME% NOTICE %REMOTE_SERVER% is responding to pings.>> %LOGPATH%\%LOGFILE%.log

250+
ping %REMOTE_SERVER% -n 5 >NUL

251-
	echo %TIME% NOTICE %REMOTE_SERVER% is responding to pings.

251+
252-
	echo %TIME%        Checking DHCP server status on %REMOTE_SERVER%...>> %LOGPATH%\%LOGFILE%.log

252+
253-
	echo %TIME%        Checking DHCP server status on %REMOTE_SERVER%...

253+
	echo %CUR_DATE% %TIME% FAILURE No ping response from %REMOTE_SERVER%. Waiting %FAILOVER_RECHECK_DELAY% seconds to check again.>> %LOGPATH%\%LOGFILE%.log

254
	echo %CUR_DATE% %TIME% FAILURE No ping response from %REMOTE_SERVER%. Waiting %FAILOVER_RECHECK_DELAY% seconds to check again.

255
	ping localhost -n %FAILOVER_RECHECK_DELAY% >NUL

256
	goto failover_loop

257
	)

258
259-
				echo %TIME% SUCCESS The DHCP service is running on %REMOTE_SERVER%.>> %LOGPATH%\%LOGFILE%.log

259+
260-
				echo %TIME% SUCCESS The DHCP service is running on %REMOTE_SERVER%.

260+
261-
				echo %TIME%         The primary DHCP server %REMOTE_SERVER% is back up. Stopping local DHCP service...>> %LOGPATH%\%LOGFILE%.log

261+
262-
				echo %TIME%         The primary DHCP server %REMOTE_SERVER% is back up. Stopping local DHCP service...

262+
263-
				net stop Dhcpserver

263+
	echo %CUR_DATE% %TIME% NOTICE  %REMOTE_SERVER% is responding to pings.>> %LOGPATH%\%LOGFILE%.log

264-
				echo %TIME%         Recovery complete. Exiting.>> %LOGPATH%\%LOGFILE%.log

264+
	echo %CUR_DATE% %TIME% NOTICE  %REMOTE_SERVER% is responding to pings.

265-
				echo %TIME%         Recovery complete. Exiting.

265+
	echo %CUR_DATE% %TIME%         Checking DHCP server status on %REMOTE_SERVER%...>> %LOGPATH%\%LOGFILE%.log

266
	echo %CUR_DATE% %TIME%         Checking DHCP server status on %REMOTE_SERVER%...

267
	

268
	:: This section checks to see if the Dhcpserver service is back up and acts accordingly

269
	%WINDIR%\System32\sc.exe \\%REMOTE_SERVER% query Dhcpserver | find "RUNNING" >NUL

270
		:: The exclamation points around ERRORLEVEL here prevent it from incorrectly being expanded using the external ERRORLEVEL results from the first IF statement

271
		if !ERRORLEVEL!==0 (

272-
echo %TIME% FAILURE %REMOTE_SERVER% is responding to pings, but DHCP isn't responding (yet?). Will try again in %FAILOVER_RECHECK_DELAY% seconds.>> %LOGPATH%\%LOGFILE%.log

272+
				echo %CUR_DATE% %TIME% SUCCESS The DHCP service is running on %REMOTE_SERVER%.>> %LOGPATH%\%LOGFILE%.log

273-
echo %TIME% FAILURE %REMOTE_SERVER% is responding to pings, but DHCP isn't responding (yet?). Will try again in %FAILOVER_RECHECK_DELAY% seconds.

273+
				echo %CUR_DATE% %TIME% SUCCESS The DHCP service is running on %REMOTE_SERVER%.

274
				echo %CUR_DATE% %TIME%         Primary DHCP server %REMOTE_SERVER% is back up. Beginning recovery procedures...>> %LOGPATH%\%LOGFILE%.log

275
				echo %CUR_DATE% %TIME%         Primary DHCP server %REMOTE_SERVER% is back up. Beginning recovery procedures...

276
				

277
				:: Back up the database that we've been running temporarily while the primary server was down

278
				echo %CUR_DATE% %TIME%         Exporting the current DHCP database...>> %LOGPATH%\%LOGFILE%.log

279
				echo %CUR_DATE% %TIME%         Exporting the current DHCP database...

280
				netsh dhcp server backup %TEMP%\DHCP-RECOVERY

281
				

282
				:: Stop our local server since we're done performing DHCP server duties

283
				echo %CUR_DATE% %TIME%         Stopping local DHCP server...>> %LOGPATH%\%LOGFILE%.log

284
				echo %CUR_DATE% %TIME%         Stopping local DHCP server...

285
				sc stop Dhcpserver

286
				

287
				:: Send the database back to the primary server

288
				echo %CUR_DATE% %TIME%         Uploading current DHCP database to %REMOTE_SERVER%...>> %LOGPATH%\%LOGFILE%.log

289
				echo %CUR_DATE% %TIME%         Uploading current DHCP database to %REMOTE_SERVER%...

290
				xcopy "%TEMP%\DHCP-RECOVERY\*" "\\%REMOTE_SERVER%\c$\%REMOTE_OPERATING_PATH%\DHCP-RECOVERY\" /S /Y /Q 2>NUL

291
292
				:: Import the current database on the primary server

293
				echo %CUR_DATE% %TIME%         Importing current DHCP database on %REMOTE_SERVER%...>> %LOGPATH%\%LOGFILE%.log

294
				echo %CUR_DATE% %TIME%         Importing current DHCP database on %REMOTE_SERVER%...

295
				netsh dhcp server \\%REMOTE_SERVER% restore "\\%REMOTE_SERVER%\c$\%REMOTE_OPERATING_PATH%\DHCP-RECOVERY"

296
				:: force a delay to let it stop

297
				ping -n 4 localhost >NUL

298
				

299
				:: Spin the primary server back up. For some reason we have to run the command twice for it to actually start. Don't ask.

300
				echo %CUR_DATE% %TIME%         Restarting DHCP server on %REMOTE_SERVER%...>> %LOGPATH%\%LOGFILE%.log

301
				echo %CUR_DATE% %TIME%         Restarting DHCP server on %REMOTE_SERVER%...

302
				sc \\%REMOTE_SERVER% stop Dhcpserver

303
				ping localhost -n 8 >NUL

304
				sc \\%REMOTE_SERVER% start Dhcpserver

305
				ping localhost -n 5 >NUL

306
				sc \\%REMOTE_SERVER% query Dhcpserver

307
				ping localhost -n 8 >NUL

308
				sc \\%REMOTE_SERVER% start Dhcpserver

309
				

310
				REM :: Check to make sure it's working

311
				REM echo %CUR_DATE% %TIME%         Verifying functionality on primary server...>> %LOGPATH%\%LOGFILE%.log

312
				REM echo %CUR_DATE% %TIME%         Verifying functionality on primary server...

313
				REM sc \\%REMOTE_SERVER% query Dhcpserver | find "RUNNING"

314
				REM if not %ERRORLEVEL%==0 echo %CUR_DATE% %TIME% FAILURE DHCP server on %REMOTE_SERVER% is not running. You should investigate this manually.>> %LOGPATH%\%LOGFILE%.log

315
				REM if %ERRORLEVEL%==0 echo %CUR_DATE% %TIME% SUCCESS DHCP server on %REMOTE_SERVER% is up and running. Recovery complete.>> %LOGPATH%\%LOGFILE%.log

316
317
				:: Clean up

318
				rmdir /S /Q %TEMP%\DHCP-RECOVERY

319
				

320
				:: Done.

321
				echo %CUR_DATE% %TIME%         Exiting.>> %LOGPATH%\%LOGFILE%.log

322
				echo %CUR_DATE% %TIME%         Exiting.

323
				goto EOF

324
				)

325
	)

326
ENDLOCAL

327
328
:: If the host responds to pings but the DHCP service isn't running, this executes

329
echo %CUR_DATE% %TIME% FAILURE %REMOTE_SERVER% is responding to pings, but DHCP isn't responding (yet?). Will try again in %FAILOVER_RECHECK_DELAY% seconds.>> %LOGPATH%\%LOGFILE%.log

330
echo %CUR_DATE% %TIME% FAILURE %REMOTE_SERVER% is responding to pings, but DHCP isn't responding (yet?). Will try again in %FAILOVER_RECHECK_DELAY% seconds.

331
ver >NUL

332
goto failover_loop

333
334
ENDLOCAL

335
echo.>> %LOGPATH%\%LOGFILE%.log

336
:EOF
        

    


            


                                


        

            



                
    

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