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Choosing an hypervisor (lemmy.world)

submitted 1 year ago* (last edited 1 year ago) by [email protected] to c/[email protected]

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Hello everyone! During one of those illuminated evenings, I got the idea to move my small server in Scaleway to some more powerful server in Hetzner. If I will make the move, I am thinking of splitting the server in various VMs, to host different services that belongs to different trust boundaries, for example:

A Lemmy/writefreely instance
Vaultwarden/Gitea
Wireguard tunnel to my home infrastructure
Blogs, and other convenience services

In order to achieve the best level of separation, I was thinking of using VMs. My default choice would be Proxmox, because I used it in the past, and because I generally trust it, however I am trying to evaluate multiple options, and maybe someone has good or better experiences to share.

Other options I thought about are:

Run everything in Docker. I am going to do this nevertheless, but Docker escapes are always possible, especially with public facing images that I did not write myself and/or that require a host volume.
KVM directly? I am OK even without a GUI to be honest. I am not aware if there is some ansible module or even better Terraform provider for this, it would be great. (EDIT: I found https://registry.terraform.io/providers/dmacvicar/libvirt/0.7.1 which seems awesome!)
ESxi? I have no experience with this solution.

Any idea or recommendation?

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[–] [email protected] 1 points 1 year ago* (last edited 1 year ago)

Ansible can be declarative if you do it right, and take the time to write a few roles to manage your use case. For example my ansible libvirt config looks like this:

libvirt_vms:
  - name: front.example.org
    xml_file: '{{ playbook_dir }}/data/libvirt/front.example.org.xml'
    autostart: no
  - name: home.example.org
    xml_file: "{{ playbook_dir }}/data/libvirt/home.example.org.xml"
    state: running

libvirt_port_forwards:
  - vm_name: front.example.org
    vm_ip: 10.10.10.225
    vm_bridge: virbr1
    dnat:
      - host_interface: eth0
        host_port: 22225 # SSH
        vm_port: 22
      - host_interface: eth0
        host_port: 19225 # netdata
        vm_port: 19999

libvirt_networks:
  - name: home
    mac_address: "52:52:10:ae:0c:cd"
    forward_dev: "eth0"
    bridge_name: "virbr1"
    ip_address: "10.10.10.1"
    netmask: "255.255.255.0"
    autostart: yes
    state: active

This is the only config I ever touch since the role handles changing configuration, running/stopping VMs, networks, etc. transparently. For initial provisioning I have a shell script that wraps around virsh/virt-install/virt-sysprep to setup a new VM in ~1 minute (It uses a preseed file, which is similar to what cloud-init offers). This part could be better integrated with ansible. Terraform has other advanced features such as managing hosts on cloud providers, but I don't need those at the moment. If I ever do, I think I would still use ansible to run terraform deployments [1]

Edit: the libvirt role if you're curious