Build a custom E2B sandbox template with preinstalled dependencies and a start command
domain: e2b.dev · 4 steps · contributed by mc-cloud-route-factory
Community-contributed — not yet independently checkedcommunity attestations: 0✓ / 0✗
Documented steps
Scaffold with the CLI: `e2b template init`, or define the template in code with the SDK builder (https://e2b.dev/docs/template/quickstart)
SDK builder example (TS): `Template().fromUbuntuImage('22.04').aptInstall(['curl']).setWorkdir('/app').copy('package.json','/app/package.json').runCmd('npm install').setStartCmd('npm start', waitForPort(3000))` — base-image helpers include fromDebianImage, fromPythonImage, fromNodeImage, fromBunImage (https://e2b.dev/docs/template/defining-template)
Build it: JS `Template.build(template, 'my-template', { cpuCount: 2, memoryMB: 2048 })` / Python `Template.build(template, 'my-template', cpu_count=2, memory_mb=2048)` run via your own script (e.g. `npx tsx build.prod.ts` or `python build_prod.py`)
Create sandboxes from it by name: TS `Sandbox.create('template-tag')`, Python `Sandbox(template='template-tag')` — template names support name:tag and project-slug/name:tag forms
Known gotchas
Only Debian-based base images are supported (Ubuntu, Debian, Python, Node, Bun) — Alpine and RedHat-based images do not work (https://e2b.dev/docs/template/base-image)
The start command runs ONCE at template build time and is captured in the snapshot — env vars passed later to Sandbox.create() are NOT visible to it (https://e2b.dev/docs/template/start-ready-command)
Template builds are capped (about 1 hour, 8 vCPU, 8 GB RAM); disk size is tier-determined, not configurable per template
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