UNIX for Dummies Questions & Answers

Hello, I have a problem - I attended a UNIX course a couple of years back but, unfortunately, I don't remember how to write scripts for shell commands. Now I want to make a script that makes a backup of a folder on a remote computer and I have no idea how to begin.

So the idea is that I want the script to create a series of archives of a target directory, each archive must be no larger than 2GB in size and files should be each put in only one archive (as opposed to half of the file in archive1 and the other half in archive2), do not worry there are no files bigger than 2GB . For the transfer along the net I remember something about "ssh" and generated keys - to avoid password requst every time.

I also want the script to create a text file which indicates which file is in which archive or which archive contains which files, whichever.


Thank you!

will it be same with `create a backup script on remote computer > run ssh from local computer to remote computer > run backup script on remote computer`?

Yes, it is the same.

you are doing from the local server.
create one file like(ex: dir-login-ip.txt) -->enter remote servers which u need to take backup
192.168.1.11:/opt/
192.168.1.12:/etc/samba /etc/squid
...................

This is the main backup script.
cd /mnt/backup
export backupdir=backup-$(date +%y-%m-%d_%H-%M-%S)
mkdir /mnt/backup/$backupdir -->where backup is stored with backup date
export datadir=/mnt/backup/$backupdir

cd /home/users/backup/ -->here the main script and dir-login-ip.txt file exists
export IFS=":"
while read server directory
do
export FILE="${datadir}/${server}.gz"
ssh -n $server "sudo tar -c ${directory} |gzip -9" > "$FILE"
echo "Done backup from $server to $FILE on `date`"
done < dir-login-ip.txt

if u dont want to enter passwords for the remote machine u should create password less login by using ssh-keygen.