NCAR Python Tutorial

NCAR Python Tutorial
- Setup
- Launch Jupyter Lab

Setup

This tutorial covers the installation and setup of a Python environment on:

Cheyenne
Casper
CGD's Hobart
Personal laptop/desktop with a UNIX-variant Operating System

NOTE: For windows users, setup scripts provided in this repository don't work on Windows machines for the time being.

Step 1: Clone NCAR Python Tutorial Repository

Run the following commmand to clone this repo to your system(e.g. cheyenne, casper, your laptop, etc...):

git clone https://github.com/NCAR/ncar-python-tutorial.git

Step 2: Install Miniconda and Create Environments

Change directory to the cloned repository
```
cd ncar-python-tutorial
```
Run the configure script:

NOTE: Be prepared for the script to take up to 15 minutes to complete.
```
./setup/configure
```

$ ./setup/configure --help
usage: configure [-h] [--clobber] [--download] [--prefix PREFIX]

Set up tutorial environment.

optional arguments:
  -h, --help            show this help message and exit
  --clobber, -c         Whether to clobber existing environment (default:
                        False)
  --download, -d        Download tutorial data without setting environment up
                        (default: False)
  --prefix PREFIX, -p PREFIX
                        Miniconda3 install location)

Default values for --prefix argument are:

Personal laptop / Hobart: $HOME/miniconda3
Cheyenne or Casper: /glade/work/$USER/miniconda3

NOTE: In case the default prefix is not appropriate for you (due to limited storage), feel free to specify a different miniconda install location. For instance, this install location may be a project workspace on a shared filesystem like GLADE or Hobart's filesystem.

The configure script does the following:

Install conda package manager if it is unable to find an existing installation. Otherwise, it will update the base environment
Create or Update python-tutorial conda environment.
Download data if not on Cheyenne or Casper or Hobart. If on Cheyenne or Casper or Hobart, create soft-links to an existing/local data repository.

Step 3: Close and re-open your current shell

For changes to take effect, close and re-open your current shell.

Step 4: Run the Setup Verification Script

Check that conda info runs successfully:
```
conda info
```
From the ncar-python-tutorial directory, activate python-tutorial conda environment:
```
conda activate python-tutorial
```
Run the setup verification script to confirm that everything is working as expected:
```
cd ncar-python-tutorial
./setup/check_setup
```
This step should print "Everything looks good!".

Launch Jupyter Lab

1. Cheyenne or DAV via JupyterHub (Recommended)

JupyterHub link: https://jupyterhub.ucar.edu/

To use the Cheyenne or DAV compute nodes,we recommend using JupyterLab via NCAR's JupyterHub deployment.

Open your preferred browser (Chrome, Firefox, Safari, etc...) on your local machine, and head over to https://jupyterhub.ucar.edu/.

You will need to authenticate with either your yubikey or your DUO mobile app

2. Cheyenne or DAV via SSH Tunneling

In case you are having issues with jupyterhub.ucar.edu, we've provided utility scripts for launching JupyterLab on both Cheyenne and Casper via SSH Tunneling:

conda activate base
./setup/jlab/jlab-ch # on Cheyenne
./setup/jlab/jlab-dav # on Casper

3. Hobart via SSH Tunneling

For those interested in running JupyterLab on CGD's Hobart, you will need to use SSH tunneling script provided in setup/jlab/jlab-hobart

conda activate base
./setup/jlab/jlab-hobart

$ ./setup/jlab/jlab-hobart --help
Usage: launch dask
Possible options are:
 -w,--walltime: walltime [default: 08:00:00]
 -q,--queue: queue [default: medium]
 -d,--directory: notebook directory
 -p,--port: [default: 8888]

4. Personal Laptop

For those interested in running JupyterLab on their local machine, you can simply run the following command, and follow the printed instructions on the console:

conda activate base
jupyter lab