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3649.

Archive Rotation

3650.

The shell script in section <xref linkend="backup-shellscripts"/> only allows for seven different archives. For a server whose data doesn't change often this may be enough. If the server has a large amount of data a more robust rotation scheme should be used.

3651.

Rotating NFS Archives

3652.

In this section the shell script will be slightly modified to implement a grandfather-father-son rotation scheme (monthly-weekly-daily):

3653.

The rotation will do a <emphasis>daily</emphasis> backup Sunday through Friday.

3654.

On Saturday a <emphasis>weekly</emphasis> backup is done giving you four weekly backups a month.

3655.

The <emphasis>monthly</emphasis> backup is done on the first of the month rotating two monthly backups based on if the month is odd or even.

3656.

Here is the new script:

3657.

#!/bin/bash
####################################
#
# Backup to NFS mount script with
# grandfather-father-son rotation.
#
####################################

# What to backup.
backup_files="/home /var/spool/mail /etc /root /boot /opt"

# Where to backup to.
dest="/mnt/backup"

# Setup variables for the archive filename.
day=$(date +%A)
hostname=$(hostname -s)

# Find which week of the month 1-4 it is.
day_num=$(date +%d)
if (( $day_num &lt;= 7 )); then
week_file="$hostname-week1.tgz"
elif (( $day_num &gt; 7 &amp;&amp; $day_num &lt;= 14 )); then
week_file="$hostname-week2.tgz"
elif (( $day_num &gt; 14 &amp;&amp; $day_num &lt;= 21 )); then
week_file="$hostname-week3.tgz"
elif (( $day_num &gt; 21 &amp;&amp; $day_num &lt; 32 )); then
week_file="$hostname-week4.tgz"
fi

# Find if the Month is odd or even.
month_num=$(date +%m)
month=$(expr $month_num % 2)
if [ $month -eq 0 ]; then
month_file="$hostname-month2.tgz"
else
month_file="$hostname-month1.tgz"
fi

# Create archive filename.
if [ $day_num == 1 ]; then
[tab]archive_file=$month_file
elif [ $day != "Saturday" ]; then
archive_file="$hostname-$day.tgz"
else
[tab]archive_file=$week_file
fi

# Print start status message.
echo "Backing up $backup_files to $dest/$archive_file"
date
echo

# Backup the files using tar.
tar czf $dest/$archive_file $backup_files

# Print end status message.
echo
echo "Backup finished"
date

# Long listing of files in $dest to check file sizes.
ls -lh $dest/

3658.

The script can be executed using the same methods as in <xref linkend="backup-executing-shellscript"/>.