(install-jetstream)=

# Installing on Jetstream2

## Goal

By the end of this tutorial, you should have a JupyterHub with some admin
users and a user environment with packages you want installed running on
[Jetstream2](https://jetstream-cloud.org/).

## Prerequisites

1. An ACCESS ID, and membership in an allocation with access to Jetstream2 resources; for more information,
   see the [Jetstream2 Allocations Overview page](https://docs.jetstream-cloud.org/alloc/overview/) and the [Get started with Jetstream2 guide](https://jetstream-cloud.org/get-started/).

## Step 1: Launch a Jetstream2 instance

We'll create a new Jetstream2 instance:

1.  Log in to the [Jetstream2 portal](https://use.jetstream-cloud.org/). You must have (and select) an allocation in order to launch instances. Click the allocation you want to charge.
2.  Click **Create** ➜ **Instance**.
3.  From the list of images, select **Ubuntu 24.04** (Jammy or newer is required for current TLJH releases).
4.  In the **Create Instance** dialog:
    1. Set a descriptive **Instance Name** (this is used in the default hostname and helps users recognize it).
    2. Choose an **Instance Size**. We suggest `m3.small` (2 vCPUs / 6 GiB RAM) or larger for more than a couple of users. The absolute minimum TLJH can start with is about **1 GiB** RAM, but you'll quickly run out with real workloads.
       - See the resource estimation guide: [Choosing resources](/howto/admin/resource-estimation) for help picking CPU, RAM, and disk.
    3. (Optional) Increase the **Volume Size** if you expect many users or large datasets. You can not easily shrink later.
5.  Launch the instance (click **Create** button at the bottom of the form).

## Step 2: Install The Littlest JupyterHub

1. Wait a few minutes for the instance to show the status "Ready"
2. Copy the **Hostname** under **Credentials**, it will be of the form: `yourinstancename.xxx0000000.projects.jetstream-cloud.org`, where `xxx000000` is the allocation ID. Keep it handy, we will use it multiple times in the next steps.

3. SSH into the instance with the `exouser` user:

   ```bash
   ssh exouser@yourinstancename.xxx0000000.projects.jetstream-cloud.org
   ```

   Need the passphrase? In Exosphere, open **Instances**, select your
   JupyterHub instance, and expand **Credentials**. Click **Show Passphrase**
   next to the `exouser` entry to reveal or copy it before running the
   `ssh` command.

4. Run the TLJH bootstrap script, replace <admin-user-name> with the name of the first admin user for this JupyterHub. Choose any name you like (don’t forget to remove the brackets!). This admin user can log in after the JupyterHub is set up, and can configure it to their needs.

   ```bash
   curl -L https://tljh.jupyter.org/bootstrap.py | sudo -E python3 - --admin <admin-user-name>
   ```

5. Open the Hostname in a web browser (http on port 80). You should see the JupyterHub login page. Your browser will warn about the site not being secure (no HTTPS)—we'll enable HTTPS in the next step. Do not login yet, first setup HTTPS, so we avoid transmitting the password in clear text.

## Step 2: Enable HTTPS

Encrypted (HTTPS) access is strongly recommended before inviting users.

See the full guide: [Enable HTTPS](/howto/admin/https). Below is a quick recipe for using the default Jetstream-provided hostname.

1. In the terminal inside the instance, configure Let's Encrypt (replace with a real email you control, and the correct hostname):
   ```bash
   sudo tljh-config set https.enabled true
   sudo tljh-config set https.letsencrypt.email you@example.com
   sudo tljh-config add-item https.letsencrypt.domains yourinstancename.xxx0000000.projects.jetstream-cloud.org
   sudo tljh-config reload proxy
   ```
2. Wait ~30–60 seconds, then reload the site using https://. If certificate issuance fails, check the logs:
   ```bash
   sudo journalctl -u traefik --since "10 minutes ago" | grep -i acme
   ```

Tips:

- Make sure ports 80 and 443 are open in your Jetstream security group (they are open by default for new projects; adjust only if you customized network policies).
- If you later attach a custom domain, add it with another `add-item` command and reload the proxy again.

## Step 3: Log in as the administrative user and set a password

1. Now log in with the `<admin-user-name>` at https://yourinstancename.xxx000000.projects.jetstream-cloud.org. Since this is the first login, you'll be prompted to set a password. Choose a strong password and store it safely. This password is now the credential for that admin user.
2. Congratulations, you have a running working JupyterHub!

## Step 4: Adding more users

```{include} add-users.md


Next common tasks:

- [](howto-admin-admin-users)
- [](howto-user-env-user-environment-apt)
- [](howto-admin-enable-extensions)
- []topic-installer-upgrade-actions)

Browse the full [How-To index](/howto/index) for more.

## Ask for help

Need a hand?

- For Jetstream2 specific questions (allocations, quotas, instance lifecycle, networking, etc.), use the [Jetstream support resources](https://docs.jetstream-cloud.org/overview/support/).
- For The Littlest JupyterHub usage, configuration, or upgrade questions, search or post in the [Jupyter forum TLJH category](https://discourse.jupyter.org/c/jupyterhub/tljh).
- If you believe you have found a TLJH bug or have a clear documentation improvement, open an issue (or pull request if you have a proposed fix) in the [TLJH GitHub repository](https://github.com/jupyterhub/the-littlest-jupyterhub).

When asking for help about TLJH, it is often useful to provide:

- A short description of what you were trying to do and what happened instead
- Relevant log excerpts (see [](/troubleshooting/logs))
- Your TLJH version (`sudo tljh-config show | grep version` if present in config) and the output of `lsb_release -a` for the OS
- Any custom installer flags or `tljh-config` changes you have applied

This information helps others debug and answer more quickly.
```
