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Proxmox Virtual Environment 9.1 available
(www.proxmox.com)
Proxmox VE is a complete, open-source server management platform for enterprise virtualization. It tightly integrates the KVM hypervisor and Linux Containers (LXC), software-defined storage and networking functionality, on a single platform. With the integrated web-based user interface you can manage VMs and containers, high availability for clusters, or the integrated disaster recovery tools with ease.
My reading of it makes it sound like a local container repo. So if you have 5 containers using nginx:latest it pulls from the template not an online repo each time.
But I could be wrong, I haven't played with PVE LXCs yet.
Yes, but then you're on that specific version of nginx. A lot of containers are built using a multi stage build process where the first stage uses a container with build tooling to build the application, then a second stage installs the result. So your end image doesn't have the build tooling and no way to update. That's intentional for security reasons. Images are meant to be immutable.