xcube Viewer Flavour

This Ansible Playbook configures an existing virtual machine running within the European Weather Cloud (EWC) with the xcube Viewer to visualize Earth Observation data in a user-friendly graphical user interface.

Functionality

The template is designed to:

• Configure a pre-existing virtual machine running Ubuntu 24.04, with public IP address, and a minimum recommended 8GB of RAM, with the xcube Viewer - a web-based visualization tool that enables users to:
  • Interactively explore and visualize multi-dimensional Earth Observation data
  • Display data from various sources including remote S3-compatible object storage
  • View time-series data with animation capabilities
  • Customize visualization with different color maps and overlays
  • Access data through a user-friendly web interface at http://<your-vm>.<tenancy-name>.<s|f>.ewcloud.host:80/viewer. More info about the standard for url creation here

For more information about xcube capabilities, please refer to the xcube Documentation.

Prerequisites

💡 This Item is supported by the EWCCLI, and can be deployed, together with a compatible VM, via it. Checkout the EWC User Stories: I want to use the ewccli documentation pages to learn how.

• Install git (version 2.0 or higher )

• Install python (version 3.9 or higher)

• Install ansible (version 2.15 or higher)

• Verify the ssh-https OpenStack Security Group exists in your EWC tenancy

  💡 You may create Security Groups via this EWC Community Hub Item if pre-required ones are missing.

• If you plan to configure an existing VM, ensure it meets the minium requirements before moving on to the Usage section below:

  • VM Image: Ubuntu 24
  • VM Plan: 4 CPU cores, 8GB RAM, 40GB Disk
  • Network: Private
  • Security Groups: ssh-https
  • Floating IP: Optional (not recommended from a security standpoint)

  Otherwise, provision a new VM with above specifications before continuing (see EWC Getting Started: Provision a VM for details).

Usage

1. Clone the repository

git clone https://github.com/ewcloud/ewc-ansible-playbook-flavours-and-provisioning.git

1.1. Change to the specific Item's subdirectory

cd playbooks/xcube-viewer-flavour

1.2. Checkout a specific Item's version

⚠️ Make sure to replace x.y.z in the command below, with your version of preference.

git checkout x.y.z

2. Download Ansible dependencies

💡 By default, Ansible Roles are installed under the ~/.ansible/roles directory within your working environment.

Download the correct version of the Ansible dependencies, if you haven't done so already:

ansible-galaxy role install --force -r requirements.yml

3. Specify the target host and SSH credentials

Create an inventory file, to specify address/credentials that your local working environment should use to connect to the target VM.

Copy into the file one of the two snippets below, and replace the placeholders (i.e. values enclosed in < > characters):

• Connecting form within the EWC tenancy's network

  # inventory.yml
  ---
  ewcloud:
    hosts:
      target:
        ansible_python_interpreter: /usr/bin/python3
        ansible_host: <add the IPV4 address of the target host>
        ansible_ssh_private_key_file: <add the path to local SSH private key file>
        ansible_user: ubuntu
        ansible_ssh_common_args: -o StrictHostKeyChecking=no
  

OR

• Connecting from outside the EWC tenancy's network

  ⚠️ This requires an SSH Bastion to be already provisioned within your EWC tenancy.

  # inventory.yml
  ---
  ewcloud:
    hosts:
      target:
        ansible_host: <add the IP address of the target host>
        ansible_ssh_user: ubuntu
        ansible_ssh_private_key_file: <add the path to local SSH private key file>
        ansible_python_interpreter: auto
  
  all:
    vars:
      ansible_ssh_common_args: >-
        -o StrictHostKeyChecking=no
        -o UserKnownHostsFile=/dev/null
        -o ProxyCommand="ssh
                        -o StrictHostKeyChecking=no
                        -o UserKnownHostsFile=/dev/null
                        -o BatchMode=yes
                        -W %h:%p
                        -i <add the path to local SSH private key file>
                        cloud-user@<add the IP address of the ssh bastion>"
  
  

4. Configure and apply the template

• Interactive Mode

  By running the following command, you can trigger an interactive session that prompts you for the necessary user inputs, and then applies changes to your target EWC environment:

  ansible-playbook -i inventory.yml xcube-viewer-flavour.yml
  

OR

• Non-Interactive Mode

  💡 To learn more about defining variables at runtime, checkout the official Ansible documentation.

  You can also run in non-interactive mode by passing the --extra-vars or -e flag, followed by a map of key-value pairs for each available input (see inputs section below). For example:

  ansible-playbook \
    -i inventory.yml \
    -e '{
        "tenancy_name": "your-tenancy",
        "federee": "EUMETSAT",
        "xcube_env_wipe": "no",
        "xcube_env_name": "xcube-demo",
        "conda_installer": "https://github.com/conda-forge/miniforge/releases/latest/download/Miniforge3-Linux-x86_64.sh",
        "conda_update_base": "false",
        "conda_prefix": "/opt/conda",
        "conda_user": "root",
        "xcube_config_location": "./templates/xcube-demo-config.yml"
      }' \
    xcube-viewer-flavour.yml
  

Inputs

Dependencies

💡 Upon execution, a SBOM (SPDX format) is auto-generated and stored in the VM's file system root directory (see /sbom.json).

Applying this template will trigger the installation of the following open-source packages onto your desired target host:

Ansible Roles

Python Packages