CentOS 6.3 - Best backup / restore solution?

Pacmanlives, 24 days ago

Any reason you can’t just do your normal backups? Should be easy enough to do an rsync if you don’t have a backup solution

StaySquared, 23 days ago

I just barely joined the organization, so I’m not entirely sure what’s in our environment/infrastructure. First task given to me is to find a full image back up solution. My assumption is that we wants to move off of CentOS for obvious reasons and move onto a new Linux distro. I haven’t spoken with my manager just yet to get a better idea as to what the end game is. Hopefully today I’ll get the full scope. I can’t imagine we’d want to continue using CentOS.

lemmyreader, 24 days ago (edited 19 days ago)

For backup and restore :

• Clonezilla
• Rescuezilla

To move from CentOS to sometimes very similar look at Rocky Linux or Alma Linux. There may even be seamless migration methods for it.

Bell, 24 days ago

I have a CentOS 6.8 server that I backup with:

dd if=/dev/sda of=/dev/sdb conv=sync,noerror bs=4M

Of course change the sda/sdb to whatever your source(backup drives are

StaySquared, 24 days ago

Wow… that’s nice and clean - straight forward.

Thank you!

Max_P, 23 days ago

Note: do that from a live CD/USB or with the source drive mounted readonly. If you dd a mounted and used filesystem, you’ll most likely end up with a corrupted and useless filesystem on the target.

StaySquared, 23 days ago

Nice! Thanks for the tip!

lemmyvore, 24 days ago

I want to point out that tools like dd or clonezilla will take a copy of the system as-is, in full.

If you want to make it more efficient you may want to look into Borg backups taken in raw mode. It’s similar to what the above tools do, but splits the image into chunks and if you repeat the backup it only stores the chunks that changed.

This means you can take snapshots regularly with minimal storage waste. If you did this with the other tools you’d occupy the full image size each time you do it.

Borg also has remote support over SSH, and can do compression and encryption.

StaySquared, 23 days ago

Thank you for the suggestion! I think the goal is to have a system as in image backup. But possibly to also back up the data and configuration to then restore that onto a new Linux distro. This is an assumption of course and I hope that is the case. I think my manager had been falling behind on updates/upgrades/back ups with some of the servers and now coming on board this will be my task(s) to handle.

lemmyvore, 23 days ago

Backing up just configuration is much simpler and efficient, but it depends greatly on how the system was set up. If you’re just taking over it’s probably safest to just take a disk image, with any of the methods.

exu, 24 days ago

Without knowing what was being hosted, the only surefire way would be pulling a complete disk image with cat or dd.

If you wanted to stay on a similar system, RHEL 9 would be a good option or one of its “as similar as possible” like AlmaLinux.

Other common distros for servers are Debian, Ubuntu server and Suse SLES/OpenSuse Leap.

SpaceCadet, 23 days ago

Without knowing what was being hosted, the only surefire way would be pulling a complete disk image with cat or dd.

That’s not surefire, unless you’re doing it offline. If the data is in motion (like a database that’s being updated), you will end up with an inconsistent or corrupt backup.

Surefire in that case would be something like an lvm snapshot.

If you wanted to stay on a similar system, RHEL 9 would be a good option or one of its “as similar as possible” like AlmaLinux.

No love for Rocky?

Also Oracle Linux is still free, and fully compatible with RHEL.

StaySquared, 24 days ago

Yep, that’s the goal. A complete disk image. I’ll do some research on the other distros you’ve recommended. I appreciate it!

Morphit, 24 days ago

Is there any reason to keep the existing set-up? If it’s just one drive, you could replace it with another and install Alma or something fresh. Then you could copy over whatever config the old system had to get up and running again. You could swap to the old drive if you needed to revert. If you have a spare machine, you could stand up the fresh setup side-by-side with the old one before swapping over.

StaySquared, 23 days ago

I have to sit down with my manager to get the full scope of work. I assume we would do a backup of the existing machine as a fallback. Then create another back up that would strictly be data and config to then restore onto a new Linux distro. But that’s purely conjecture at this time.