On 6. 4. 2021, at 18:06, Sandro Bonazzola <sbonazzo@redhat.com> wrote:
Il giorno dom 4 apr 2021 alle ore 16:13 Nicolas Kovacs <info@microlinux.fr <mailto:info@microlinux.fr>> ha scritto: Hi,
I'm a 53-year old Austrian living in Montpezat, a small village in South France. I'm an IT professional with a focus on Linux and free software, and I've been a Linux user since Slackware 7.1.
Welcome to oVirt community!
Hi!
I'm doing web & mail hosting for myself and several small structures like our local school and a handful of local companies. Up until recently these hostings have happened on "bare metal" root servers using CentOS 7. One main server is hosting most of the stuff: WordPress sites, one OwnCloud instance, Dolibarr management software, GEPI learning platform, Postfix/Dovecot mail server, Roundcube webmail, etc.
This setup has become increasingly problematic to manage, since applications have more and more specific requirements, like different versions of PHP and corresponding modules.
So I decided to split everything up nicely into a series of virtual machines, each one with a nicely tailored setup.
I have a couple of sandbox servers, one public and one local, running Oracle Linux 7 (a RHEL clone like CentOS). I played around with it, and KVM-based virtualization already works quite nicely.
While looking for documentation, I stumbled over oVirt, which I didn't even know existed until last week. Before I dive head first into it, I'd be curious to know a few general things.
1. Would it be overkill for a small structure like mine?
If you have only a couple of bare metal and a few VMs you may consider more lightweight virtualization managers like cockpit project machine plugin (https://cockpit-project.org/guide/latest/feature-virtualmachines <https://cockpit-project.org/guide/latest/feature-virtualmachines> ) or kimchi project (https://github.com/kimchi-project/kimchi <https://github.com/kimchi-project/kimchi> ) or virt-manager (https://virt-manager.org/ <https://virt-manager.org/> )
We’ve seen people with 70+ machines being managed by shell scripts and libvirt, and also oVirt users with just a single host. Those would be extremes. I would personally start using oVirt once I have more than 4-5 hosts or so, and/or more than 20 VMs.
2. Will I be able to do HA on a series of modest KVM-capable root servers even if they are located in different datacenters across different countries?
I think it mostly depends on the network latency and speed. Having HA with servers in different countries may be problematic.
yeah, in a stretched cluster setup it would work, but the expectations are that the link is almost as local. It does work ok with several hundred ms latency. but it needs to be reliable.
3. One problem I couldn't resolve using a bone-headed keep-it-simple KVM setup is backup. For my bare-metal servers I've been using incremental backups using Rsnapshot for years. Here's a blog article I wrote on the subject:
https://blog.microlinux.fr/rsnapshot-centos-7/ <https://blog.microlinux.fr/rsnapshot-centos-7/>
Unfortunately I can't use this approach with huge QCOW images, at least not without jumping through burning loops.
Is there an easy way to perform remote incremental backups with oVirt?
There are a few backup vendors that provide solutions for backing up oVirt VMs, you can just query google for them.
I think none of the vendors are ready with their products to use incremental backup just yet. it’s close though. you can also just adapt and use examples[1] of the incremental backup feature[2]. if you’d want to just hack up some DIY backup solution. incremental backup us a fairly recent addition to oVirt (and to qemu/libvirt in general) Thanks, michal [1] https://github.com/oVirt/ovirt-engine-sdk/blob/master/sdk/examples/backup_vm... [2] https://www.ovirt.org/documentation/incremental-backup-guide/incremental-bac...
BTW, I took a peek at Proxmox and Ceph, but I admit I'm a die-hard RHEL-clone user.
Cheers from the sunny South of France,
Niki
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