Score:0

Ubuntu

Ubuntu Server Backup Script

MckPT

12/19/22, 7:35 PM

Need some help to tune a script to perform backups of my system.

So I have a server 20.04 up and running, every now and then, when I make some updates/changes it breaks something, and I loose some time to correct the problems. At first I thought in using RAID 1, but then I realized if i break the original the spare it'll have the same problem.

So after some thinking I made a dd copy of the original disk (#1) to another one (#2), and leave the #2 connected but not mounted. At first I thought in leaving the disk disconnected and with help of a bootable media, I perform a new dd backup... But that doesn't seem very professional. So I decided to make a script that, mount the #2 hd, call rsync and in the end unmount

Will this work? The disk it's a complete sector by sector copy, and after this point, will have the changes of #1 reflected in the #2 with rsync.

I don't have any experience in building shell scripts, so I need help to tune mine.

I need to mount the #2, check if it's really mounted (check if mount folder is not empty?), run rsync and write the complete log to a file, and in the end unmount. This is what I have now:

#! /bin/bash
# -- VARS
MOUNT_DEV='/dev/sdb2'
MOUNT_FOLDER='/mnt/hdd_backup'
SOURCE='/*'
DESTINATION='/mnt/hdd_backup/'
LOG_FILE='/home/jnap/external/rsync.log'

echo 'Mount the backup hdd'
mount $MOUNT_DEV $MOUNT_FOLDER
echo 'Mount finished'

#Check if it's really mounted? dir is not empty? 
echo 'Run Rsync - DryRun only to test' 
rsync -aAHXv --dry-run --delete $SOURCE $DESTINATION --exclude={/dev/*,/proc/*,/sys/*,/tmp/*,/run/*,/mnt/*,/media/*,/lost+found,/snap,/home/jnap/external/*,var/lib/lxcfs/*} > $LOG_FILE
echo 'Finished Rsync'

echo 'Unmount the backup hdd'
mount -l $MOUNT_FOLDER
echo 'Unmount finished'

At first this is a manual job. But later I'm thinking in create a cron job for it, maybe run once a week during the weekend.

Thanks

0 + 11

backup

scripts

mount

rsync

sudodus

12/19/22, 7:53 PM

With the `rsync` option `--delete` I would say that it is a synchronizing script, not a backup script. Maybe you should consider `--backup` (and maybe `--backup-dir=`) too, in order to save *versions* of files, that are modified or deleted.

MckPT

12/19/22, 8:02 PM

It's like an RAID alternative, I don't need the previous versions, neither deleted files. I just need a copy of the last functional version of the system.

sudodus

12/19/22, 8:08 PM

I see, then it looks good to me (but I have not tested it or looked into it in a very detailed way). I use `rsync` so I am used to running it with 'a lot of' options, and I think your options look OK. It is a good idea to start by running a dry run and look carefully at the output before running the real copying process :-)

James S.

12/19/22, 8:10 PM

This really seems as though you are trying to take periodic snapshots of the filesystem, such that you can revert to a snapshot in the event of a disaster. Is there any reason why you can't use LVM snapshotting capabilities?

MckPT

12/19/22, 8:38 PM

@JamesS. don't know anything about LVM... I'll take a look. Thanks

James S.

12/19/22, 8:47 PM

There's a tool called "snapper" which may be what you are looking for: http://snapper.io/overview.html

bac0n

12/20/22, 8:02 AM

I think the exclude should be `--exclude={'/dev/*','/proc/*'}` you don't want any glob expantion

MckPT

12/21/22, 9:17 AM

@JamesS. already saw that tool, but for now I just stick to the rsync, when I have some extra time I'll check the snapper and if it fits my needs, I don't need snapshots at least I think I don't... Anyway thanks for the inputs.

MckPT

12/21/22, 9:17 AM

@bac0n thanks fot the info.

James S.

12/21/22, 4:01 PM

I mean, what you are describing here isn't "backups" - it's snapshots.

MckPT

12/23/22, 8:47 AM

@JamesS. okay, that's the correct term :) But the main purpose it's to only have a backup/snapshot/copy of the system when I decided to, loosing the previous one... Thanks

Elon Musk

I sit in a Tesla and translated this thread with Ai:

EN: Ubuntu Server Backup Script

TH: สคริปต์สำรองเซิร์ฟเวอร์ Ubuntu

RO: Ubuntu Server Backup Script

RU: Сценарий резервного копирования сервера Ubuntu

VI: Tập lệnh sao lưu máy chủ Ubuntu

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