SEC.01

The playbook

The run starts read-only: the recon probes decide what happens next. The steps that follow are adapted to the distribution and state found — a real machine is rarely clean.

  1. 01recondistro, version and package manager (apt or dnf)
  2. 02reconDocker Engine + compose plugin present and running? (otherwise, docker step)
  3. 03reconJupyterLab already deployed (container, volume, /opt/jupyter)? healthy → verify and skip
  4. 04reconport 8888 free?
  5. 05reconRAM ≥ 2 GB and ≥ 5 GB of free disk
  6. 06actInstall Docker Engine + Compose (only if missing)verify
  7. 07actGenerate the access token (/opt/jupyter/jupyter.env)verify
  8. 08actStart JupyterLabverify
  9. 09actThe API responds (token required)verify

SEC.02

What it verifies

Each step ships its own check. The run only moves on when the check passes, so what the recipe reports as done is what is actually on the server.

  1. 01Install Docker Engine + Compose (only if missing)Verified bysystemctl is-active docker && docker compose version
  2. 02Generate the access token (/opt/jupyter/jupyter.env)Verified bystat -c '%a' /opt/jupyter/jupyter.env && grep -c '^JUPYTER_TOKEN=.' /opt/jupyter/jupyter.env
  3. 03Start JupyterLabVerified bydocker inspect -f '{{.State.Status}}' jupyter
  4. 04The API responds (token required)Verified bytimeout 120 bash -c 'until curl -s -o /dev/null http://127.0.0.1:8888/api; do sleep 3; done'; curl -s -o /dev/null -w '%{http_code}' http://127.0.0.1:8888/api/contents

SEC.03

Guardrails

Non-negotiable instructions the run must respect, whatever it finds on the server.

Never disable token auth and never publish 8888 on a public IP: JupyterLab runs arbitrary code. Token in /opt/jupyter/jupyter.env (600), never in logs. Public exposure only behind an HTTPS reverse proxy, on explicit request.

SEC.04

How a recipe runs in Servor

Servor is zero-knowledge: the platform cannot execute anything on its own. When you launch this recipe, a run reads the reconnaissance, plans the steps and asks for your approval. Each approved command is signed by your browser — with a key the server never sees — then relayed verbatim to the agent, which verifies the signature locally before executing.

recipe — fail2ban_setup150+ in catalogue
security4 steps · low risk · idempotentrun
reconsshd present? ufw active? existing jails?✓
actinstall fail2ban · write default jails✓
actenable service · restart sshd (safe)✓
verifytest ban 60s · jails active · sshd alive✓

search by intent — type “firewall”, get ufw

  • 01Read-only reconnaissance before any change
  • 02Every command signed by your browser, approved by you
  • 03Each step verified before the run moves on, every run kept in the history

SEC.05

Deploy on Servor button

Maintain JupyterLab or a project that needs it? Put this button in your README or on your site: one click and your users install it on their own server.

Deploy on ServorDark background
Deploy on ServorLight background
[![Deploy on Servor](https://servor.app/badges/deploy-on-servor.svg)](https://servor.app/deploy/install-jupyterlab)

SEC.06

Verified recipe

Run this recipe on your server

Connect a server, launch the recipe, and approve each step as Servor executes and verifies it. Free plan, no card required.