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backup_script [2025/06/10 17:08] – hogwildbackup_script [2025/09/10 15:45] (current) – Key issue fixec thilo
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  \\  \\
  
-  - You want to schedule a backup done via a cron job.  +  - You want to schedule a backup to be done via a cron job.  
-  - You want the script initiated from, and stored in a safe location  \\ on a server on the network, (not on the router).+  - You want the script initiated from, and stored in a safe location  \\ on a server on the network (not on the router).
   - You do not wish to install SFTP just for these backups.   - You do not wish to install SFTP just for these backups.
  
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 The script at the bottom of this page will create and download the backup without needing to have SFTP enabled on the router. The script at the bottom of this page will create and download the backup without needing to have SFTP enabled on the router.
  
-We could, of course, create the backup as a cron job on the router itself, and then use the mechanism applied in the script below to download the backup file. However, let's assume you want everything done in just one run of the script. To achieve this, the script covers creation of the backup in an individual file with timestamp and download.+You could, of course, create the backup as a cron job on the router itself, and then use the mechanism applied in the script below to download the backup file. However, let's assume you want everything done in just one run of the script. To achieve this, the script covers creation of the backup in an individual file with timestamp and download.
  
 In this way, just one run of the script on the backup server will create the backup and download it to to a safe location. In this way, just one run of the script on the backup server will create the backup and download it to to a safe location.
- 
-Action is based on using a here doc to execute commands on the router. 
  
  \\ \\ The backup is created using the "//nvram save//" command. This is how backups are done "under the hood" in the web interface.  \\ \\ The backup is created using the "//nvram save//" command. This is how backups are done "under the hood" in the web interface.
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   - Create a backup via a script   - Create a backup via a script
   - Copy both files to router   - Copy both files to router
-  - Convert both files via the command: \\  "//nvram convert// <filename1/2>  > result_file1/2.txt"+  - Convert both files via the command: \\  ''"nvram convert <filename1/2>  > result_file1/2.txt"''
   - Perform a diff between the two resulting text files.   - Perform a diff between the two resulting text files.
  
  \\  \\
  
-The script then archives the resulting data in a tar file and sends it through the netcat command, transferring it over the network. Restore a backup file is the same procedure as resorting an archive created in the WEB-GUI (last tested 29.04.2025).+The script then archives the resulting data in a tar file and sends it through the netcat command, transferring it over the network. Restore a backup file uses the same procedure as restoring an archive created in the web interface. This was last tested on 2025-04-29.
  
  \\  \\
 +
  
 ==== Prerequisites ==== ==== Prerequisites ====
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   - The netcat command must be available on the backup server.   - The netcat command must be available on the backup server.
-  - The router's root user must have access to the public SSH key \\ of the user executing the script on backup server.+  - The user executing the script on backup server must have access to the router's root user via SSH key.
  
  \\  \\
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  \\  \\
  
-  - Command line arguments: backup directory, id-file and router (as IP address). \\ If provided, these will be used. Otherwise, the defaults will apply \\ (Router IP from `ip r`).+  - Command line arguments: backup directory, id-file and router (as IP address). \\ If provided, these will be used. Otherwise, the defaults will apply \\ (search Router IP from "ip r").
   - Sometimes tar may fail. You can solve this by just cleaning. The next \\ cron run may do that.   - Sometimes tar may fail. You can solve this by just cleaning. The next \\ cron run may do that.
   - All earlier backups from the same day are abandoned.   - All earlier backups from the same day are abandoned.
-  - A total number of backups is kept. This number is configurable. \\ Older ones are deleted.+  - A total number of backups is kept. This number is configurable. \\ Older backups are deleted.
  
  \\  \\
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    TRANSFER_FILENAME=config.tar    TRANSFER_FILENAME=config.tar
        
-   # It may be, that Tomato router has no - or other, wrong - timeother or no timee +   # It may happen, that Tomato router has no - or other, wrong - time 
-   # take date from localhost (i.e. backupserver) into backup filename+   # take date from localhost (i.e. backup server) into backup filename
    DATE=`date +%Y%m%d_%H%M`    DATE=`date +%Y%m%d_%H%M`
 +   
    pushd ${DIR2BACKUP} > /dev/null    pushd ${DIR2BACKUP} > /dev/null
        
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    # Thinks like    # Thinks like
    # VAR=`nvram get os_version`     # VAR=`nvram get os_version` 
-   # seem not to work in bash via here doc, so write results into script file and source it +   # seem not to work in bash via here doc, so write results into script file and source it. 
-   # Further the individual filename is general not known, so tar it into temp file+   # Further the individual filename is generally not known, so tar it into temp file.
    #    #
    # Kill netcat zombies    # Kill netcat zombies
    kill -9 `ps -ef | grep -v grep | grep netcat | sed -e "s/ [ ]*/ /g" | cut -d " " -f 2` 2> /dev/null    kill -9 `ps -ef | grep -v grep | grep netcat | sed -e "s/ [ ]*/ /g" | cut -d " " -f 2` 2> /dev/null
    (netcat -l -p ${PORT} > ${TRANSFER_FILENAME}) &    (netcat -l -p ${PORT} > ${TRANSFER_FILENAME}) &
 +   # Create the backup file on the router by executing the following commands (indented lines) there
    ssh ${USER}@${ROUTER} -i ${LOCAL_ID_FILE} <<ENDSSH    ssh ${USER}@${ROUTER} -i ${LOCAL_ID_FILE} <<ENDSSH
         rm -f ${SCRIPT_FILE} ${TRANSFER_FILENAME} ${PREFIX}_*_${DATE_REGEX}_${TIME_REGEX}.${EXT}         rm -f ${SCRIPT_FILE} ${TRANSFER_FILENAME} ${PREFIX}_*_${DATE_REGEX}_${TIME_REGEX}.${EXT}
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         tar -cvf ${TRANSFER_FILENAME} ${PREFIX}_*_${DATE_REGEX}_${TIME_REGEX}.${EXT} > /dev/null         tar -cvf ${TRANSFER_FILENAME} ${PREFIX}_*_${DATE_REGEX}_${TIME_REGEX}.${EXT} > /dev/null
         cat ${TRANSFER_FILENAME} | nc ${BACKUPHOST} ${PORT}         cat ${TRANSFER_FILENAME} | nc ${BACKUPHOST} ${PORT}
-        sleep 5 # just wait a little bit before deleting the files not needed here any more+        sleep 5 # just wait a little while before deleting the files not needed here any more
         rm -f ${SCRIPT_FILE} ${TRANSFER_FILENAME} ${PREFIX}_*_${DATE_REGEX}_${TIME_REGEX}.${EXT}         rm -f ${SCRIPT_FILE} ${TRANSFER_FILENAME} ${PREFIX}_*_${DATE_REGEX}_${TIME_REGEX}.${EXT}
    ENDSSH    ENDSSH
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         fi         fi
         # In total, keep only ${NO_OF_DIFF_FILES_TO_BE_KEPT} files - delete older files (of any day)         # In total, keep only ${NO_OF_DIFF_FILES_TO_BE_KEPT} files - delete older files (of any day)
-        OLDER_FILES=`ls -t ${ALL_BACKUP_FILES_PREFIX}_${DATE_REGEX}_${TIME_REGEX}.${EXT} | sed -e 1,${NO_OF_DIFF_FILES_TO_BE_KEPT}d`+        OLDER_FILES=`ls ${ALL_BACKUP_FILES_PREFIX}_${DATE_REGEX}_${TIME_REGEX}.${EXT} | sort -r | sed -e 1,${NO_OF_DIFF_FILES_TO_BE_KEPT}d`
         if [ "${OLDER_FILES}" ]; then         if [ "${OLDER_FILES}" ]; then
                 echo "keep only ${NO_OF_DIFF_FILES_TO_BE_KEPT} in total, delete:"                 echo "keep only ${NO_OF_DIFF_FILES_TO_BE_KEPT} in total, delete:"
backup_script.1749571682.txt.gz · Last modified: by hogwild

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