Hermes Agent Server Requirements: The Missing Numbers
The docs have no system requirements page (issue 73754). From measured reports and our production fleet: 1 GB is a demo, 2 GB is the always-on floor, 4 GB is comfortable, local models start at 8 GB, 2 cores suffice, and 20 GB of disk keeps it boring.
The Hermes Agent documentation answers almost everything except the question people ask first: what machine does this need? Issue 73754, open since July 29, 2026, states it plainly: the installation page's prerequisites cover software only, and a grep across the getting-started docs finds no RAM, disk or CPU guidance at all. This page assembles the missing numbers from the measurements that exist: figures reported in the project's own issue tracker, the official platform list, and a fleet of Hermes servers we operate in production.
The two measurements that set the floor
Two numbers from the issue tracker do most of the work. First, the gateway, the always-on process, was measured growing from roughly 300 MB at a fresh start to between 1.4 and 1.6 GB over about 20 hours of light use, in issue 58817, July 5, 2026. Second, the dashboard's web build alone peaked at 387.9 MB and got the process killed on a 960 MB server, logged as an out-of-memory kill in issue 14898, April 24, 2026.
What this means for you: a 1 GB machine sits under the waterline of the gateway's own measured growth. It can boot Hermes and it lives one busy afternoon away from the out-of-memory killer. Treat 1 GB as a demo, and 2 GB as the practical floor for an agent that stays up.
The sizing table the docs skip
| Setup | RAM | Why |
|---|---|---|
| Demo, short sessions | 1 GB | Boots, then flirts with the OOM killer issue 14898 documented |
| Always-on agent, cloud models | 2 GB | Covers the gateway's measured 1.4 to 1.6 GB growth with headroom |
| Agent plus dashboard plus room to grow | 4 GB | Build spikes, browser automation and updates stop competing |
| Local models on the same box | 8 GB and up | The docs' own local model guide starts at 8 GB for 3B-parameter models, cited in issue 73754 |
CPU is the quiet part of the story: on our own production fleet, Hermes agents run around the clock on 2-core dedicated servers without strain, measured through July and August 2026. Disk deserves more respect than it gets. The runtime installs Python 3.11 and Node.js v26 per the official installation page, browser automation adds a full Chrome build, and issue 58172 measured update leftovers alone reaching 884 MB after months of hermes update. Twenty gigabytes of disk keeps all of that boring.
Operating systems, from the official list
The official platform page lists tier-one support for macOS on Apple Silicon, Windows 10 and 11, Linux and WSL2 on x86_64 and aarch64, and Docker containers, with Android via Termux and Nix as best-effort tiers. For a server, that makes an ordinary Ubuntu LTS on x86_64 the well-trodden path, and our troubleshooting section covers the Ubuntu install traps separately.
Size it in one minute
- Decide where models run. Cloud models keep the box light; local models move you to the 8 GB league before anything else matters.
- Pick RAM off the table above. 2 GB always-on floor, 4 GB comfortable.
- Give it 20 GB of disk so the runtime, the browser and months of updates never fight.
- Stay on the tier-one list: Ubuntu LTS on x86_64 is the path the reports and fixes assume.
Or skip the arithmetic: our managed Hermes Agent hosting sizes the dedicated EU server to these numbers from the start, and the 7-day free trial needs no card. For what the machine costs month to month, the Hermes Agent cost guide breaks it down.
Sources: Hermes Agent issues 73754, 58817, 14898 and 58172, the official installation and platform support pages, all read on August 29, 2026, and measurements on our own production fleet from July and August 2026.
Frequently asked questions
- How much RAM does Hermes Agent need?
- The gateway alone was measured growing to 1.4 to 1.6 GB over 20 hours in issue 58817, so 2 GB is the practical floor for an always-on agent on cloud models. 4 GB adds comfortable headroom for the dashboard and browser automation.
- Does Hermes Agent run on a 1 GB VPS?
- It boots, and issue 14898 documents the risk: the dashboard build alone peaked at 387.9 MB and drew an out-of-memory kill on a 960 MB server. Treat 1 GB as a demo tier.
- Which operating systems does Hermes Agent support?
- Tier one per the official platform page: macOS on Apple Silicon, Windows 10 and 11, Linux and WSL2 on x86_64 and aarch64, and Docker. Android via Termux and Nix are best-effort tiers.
- How much disk space does Hermes Agent use?
- The runtime installs Python 3.11 and Node.js v26, browser automation adds a full Chrome build, and issue 58172 measured update leftovers alone at 884 MB after months. 20 GB keeps everything comfortable.