SSH: Rotate backup shell script to remove directories (old backup files)

by on October 9, 2007 · 6 comments· LAST UPDATED September 23, 2008

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Most time you have a limited space on the remote SFTP/ SSH backup server. Here is the script that periodically cleanup old backup files from the server i.e it will remove old directories.

Requirements

Script will automatically calculate date from today's date. By default it will keep only last 7 days backup on server. You can easily increase / decrease this limit. In order to run script you must meet the following criteria:

  • Remote SSH server with rm command execution permission
  • SSH Keys for password less login (see how to setup RSA / DSA keys for password less login)
  • Accurate date and time on local system (see how to synchronize clock using ntpdate ntp client)
  • Remote backup directory must be in dd-mm-yyyy or mm-dd-yyyy format. For example daily mysql backup should be stored in /mysql/mm-dd-yyyy format.

Sample Script Usage

Run the script as follows:
./rot.backup.sh 7 /mysql "rm -rf"
Where,

  • 7 : Remove last 7 days files
  • /mysql : Base directory to clean up. If todays date is 9/Oct/2007, it will remove last 7 days directory /mysql/02-10-2007, /mysql/01-10-2007, .... /mysql/26-09-2007, /mysql/25-09-2007. It means script will only keep last 7 days backup on remote sftp / ssh server.
  • rm -rf : Command to run on directory structure

Sample Shell Script

Install following script:

#!/bin/bash
if [ "$#" == "0" ];then
  echo "$0 upper-limit path {command}"
  exit 1
fi
### SSH Server setup ###
SSH_USER="vivek"
SSH_SERVER="nas.nixcraft.in"
START=7
DIR_FORMAT="%d-%m-%Y" # DD-MM-YYYY format
#DIR_FORMAT="%m-%d-%Y" #MM-DD-YYYY format
## do not edit below ##
LIMIT=$( expr $START + $1 )
## default CMD ##
CMD="ls"
SSH_PATH="."
[ "$3" != "" ] && CMD="$3" || :
[ "$2" != "" ] && SSH_PATH="$2" || :
DAYS=$(for d in $(seq $START $LIMIT);do date --date="$d days ago" +"${DIR_FORMAT}"; done)
for d in $DAYS
do
  ssh ${SSH_USER}@${SSH_SERVER} ${CMD} ${SSH_PATH}/$d
done

Run above script via cron tab (cronjob):
@daily /path/to/rot.ssh.script 7 "/html" "rm -rf"
@daily /path/to/rot.ssh.script 7 "/mysql" "rm -rf"

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1 Yannick October 10, 2007 at 11:54 pm

I usualy use someting like this:

find /var/backup/ -name ‘backup*’ -mtime +7 | xargs rm -f

2 nixCraft October 11, 2007 at 4:50 am

Yannick,

Thanks for quick one liner :)

Just a quick note many backup services only allows limited set of commands in chrooted ssh jail. Many time find and other advanced commands are not available so you need to craft something like this

3 Yannick October 11, 2007 at 10:14 am

Ohhhh..yes..’find’ will probably don’t work in most of ssh jails..

BTW… Thank you very much Vivek for all your very useful tips.. :)

4 Reetika October 22, 2007 at 4:57 am

Hi
Pls suggest any one liner or script for my probelm.
I need to tremove the files which are 14 days old but need to skip those folder which are having any single file with latest date.
Need to skip whole folder which contain any single latest file with all the old files also which that particular folder contain.

my script is like this
find . -mtime +14 -exec rm -f {} \;
find . -type d -mtime +14 -exec rmdir {} \;
perl -MFile::Find -e”finddepth(sub{rmdir},’.’)”
#find . -depth -type d -empty -exec rmdir {} \;

Thanks
Reetika Gupta

5 Al June 22, 2008 at 1:21 pm

Watch out of that pipe comes back empty – rm -f will then act on whatever the contents of the current directory are!

6 Srinivasan August 13, 2011 at 11:20 pm

I need to remove 1 month older files from a sftp server username@servername, where
i don’t have access for ssh in the sftp server.

Please advise

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