lxc templates

How can one import a LXC container template from linuxcontainers.org? According to https://images.linuxcontainers.org/ there are many more LXC container templates then those available as predefined templates by PROXMOX. Understandably, since those in the template list are officially supported...

Hi, I use the free Proxmox VE, so of course I don't have any "demands" on this topic, but I have a couple of CentOS 7 systems (a few LXC containers in Proxmox and a VPS), and I was holding off migrating a Proxmox 6.4 to a new 7.x system until I could migrate those CentOS 7 systems to EL9 (I...

I know this is a bit early and the version is not final, but i would like to start integrate our system and migration from older Ubuntu to this one, i have a working Ubuntu 20.04 based on standard 20.04 template, but the upgrade did not work. any idea what would be the best practice ?

In my testing I have only used LXC templates provided with pveam. I have found oddities in the filesystem layout for some LXC templates from proxmox. I have not tried all other templates but the ones where I have found the oddities are theese. debian-10-standard_10.7-1_amd64.tar.gz...

AFAIK, exim is the debian default MTA. However, proxmox LXC templates for debian come with postfix installed instead of exim. And, most of all, the /etc/mailname is not created and populated at configuration. This breaks the installation or configuration of some packages (like sympa) which rely...