This tutorial explains how to set up a headless RAG-enabled large language model (LLM) on an Ubuntu server. By the end, you will be able to chat with your LLM running locally on your own infrastructure. Your conversations will not be sent to third-party servers, ensuring that your prompts, responses, and any uploaded files remain private and under your control. A quick word on security Effective network security begins with a strong perimeter defence. One of the most critical steps is configuring a firewall on your router and hosts to explicitly deny all unsolicited inbound traffic from the internet. This “default deny” posture ensures that no internal services are accidentally exposed, creating a controlled environment where all communication is initiated from within your trusted network. A common and potentially dangerous misconception is that Network Address Translation (NAT) alone provides sufficient security. While NAT obscures internal devices, it is a routing mechanism rather...
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