Managing security across multiple Proxmox LXC containers can quickly become a nightmare. Initially, I was installing fail2ban or standalone CrowdSec instances on every single container (Nginx Proxy Manager, Nextcloud, Gitea, etc.).
This meant checking logs across 15 different machines, duplicating blocklists, and wasting CPU cycles.
The solution? A CrowdSec Hub-and-Spoke Architecture.
Instead of every container doing its own threat analysis, I designated one lightweight Debian LXC container as the LAPI Server (The Hub).
All other containers became Bouncers (The Spokes). They only run the CrowdSec agent, forward their logs to the Hub, and ask the Hub if an IP should be blocked.
How to set it up:
- Spin up a Debian LXC for the Hub. Install CrowdSec.
- Configure the LAPI to listen on your local network IP instead of localhost.
- Generate a machine credential for each Spoke.
- On your Spokes (like Nginx), install the CrowdSec agent, disable the local LAPI, and point the config to the Hub's IP using the credentials.
The Result:
By centralizing the threat intelligence, I drastically reduced the total CPU overhead of my security stack. Best of all, if an attacker hits my Nextcloud container and gets banned, they are instantly banned across every other service on the network.
P.S. If you are struggling with your Proxmox infrastructure, cloud costs, or deployment pipelines and don't have time to fix it yourself, I do this for a living. Book a free 15-minute infrastructure audit with me here.
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