If you have a dedicated server with OVHcloud, you can purchase additional IPs, also known as "Fallback IPs", for your server. Because I have enough resources on my dedicated servers, I wanted to give/rent VPSes for my friends for them to use for their own projects, but I wanted to give them the real VPS experience, with a real external public IP that they can connect and use.
So I figured out how to bind an external IP to your LXD container/LXD VM! Although there are several online tutorials discussing this process, none of them worked for me until I stumbled upon this semi-unrelated OVHcloud guide that helped me go in the right direction.
Even though I stopped using Proxmox on my dedicated servers, there were still some stateful containers that I needed to host that couldn't be hosted via Docker, such as "VPSes" that I give out to my friends for them to host their own stuff.
Enter LXD: A virtual machine and system containers manager developed by Canonical. LXD is included in all Ubuntu Server 20.04 (and newer versions), and can be easily set up by using the
lxd init command. Just like how Proxmox can manage LXC containers, LXD can also manage LXC containers. Despite their similar names, LXD is not a "successor" to LXC; rather, it is a management tool for LXC containers. They do know that this is very confusing.
Keep in mind that LXD does not provide a GUI like Proxmox. If you prefer managing your containers through a GUI, you may find LXD less appealing. But for me? I rarely used Proxmox's GUI anyway and always managed my containers via the terminal.
Peter Shaw has already written an excellent tutorial on this topic, and his tutorial rocks! But I wanted to write my own tutorial with my own findings and discoveries, such as how to fix network issues after migrating the container, since that was left out from his tutorial because "it is a little beyond the scope of this article, that’s a topic for another post."
The source server is running Proxmox 7.1-12, the target server is running Ubuntu Server 22.04. The LXC container we plan to migrate is running Ubuntu 22.04.