1 - Neurodesk Architecture

The architecture of the Neurodesk ecosystem


Neurodesktop is a compact Docker container with a browser-accessible virtual desktop that allows you develop and implement data analysis, pre-equipped with basic fMRI and EEG analysis tools. To get started, see: Neurodesktop (Github)

  • docker container with interface modifications
  • contains tools necessary to manage workflows in sub-containers: vscode, git
  • CI: builds docker image and tests if it runs; tests if CVMFS servers are OK before deployment
  • CD: pushes images to github & docker registry


Neurocommand offers the option to install and manage multiple distinct containers for more advanced users who prefer a command-line interface. Neurocommand is the recommended interface for users seeking to use Neurodesk in high performance computing (HPC) environments.

To get started, see: Neurocommand (Github)

  • script to install and manage multiple containers using transparent singularity on any linux system
  • this repo also handles the creation of menu entries in a general form applicable to different desktop environments
  • this repo can be re-used in other projects like CVL and when installing it on bare-metal workstations
  • CI: tests if containers can be installed
  • CD: this repo checks if containers requested in apps.json file are available on object storage and if not converts the singularity containers based on the docker containers and uploads them to object storage


transparent-singularity offers seamless access to applications installed in neurodesktop and neurocommand, treating containerised software as native installations.

More info: transparent-singularity (Github)

  • script to install neuro-sub-containers, installers are called by neurocommand
  • this repo provides a way of using our containers on HPCs for large scale processing of the pipelines (including the support of SLURM and other job schedulers)
  • CI: test if exposing of binaries from container works


neurocontainers contains scripts for building sub-containers for neuroimaging data-analysis software. These containers can be used alongside neurocommand or transparent-singularity.

To get started, see: Neurocontainers (Github)

  • build scripts for neuro-sub-containers
  • CI: building and testing of containers
  • CD: pushing containers to github and dockerhub registry


Neurodocker is a command-line program that generates custom Dockerfiles and Singularity recipes for neuroimaging and minifies existing containers.

More info: Github

  • fork of neurodocker project
  • provides recipes for our containers built
  • we are providing pull requests back of recipes
  • CI: handled by neurodocker - testing of generating container recipes

2 - Neurodesktop Release Process

A description of what to do to create new release of our Neurodesktop


  1. Check if the last automated build ran OK: https://github.com/NeuroDesk/neurodesktop/actions
  2. Run this build date and test if everything is ok and no regression happened
  3. Check what changes where made since the last release: https://github.com/NeuroDesk/neurodesktop/commits/main
  4. Summarize the main changes and copy this to the Release History: https://www.neurodesk.org/docs/overview/release-history/
  5. Change the version of the latest desktop in https://github.com/NeuroDesk/neurodesk.github.io/blob/main/data/neurodesktop.toml
  6. Commit all changes
  7. Tweet a quick summary of the changes and announce new version: https://masto.ai/@Neurodesk

Neurodesk App:

Release process

Follow these steps to create a new release of the Neurodesk App.

  1. If there’s new version of Neurodesktop image, Github Action will PR with updated jupyter_neurodesk_version in neurodesktop.toml file. Double-check and merge this PR.

  2. Create a new release on GitHub as pre-release. Set the release tag to the value of target application version and prefix it with v (for example v1.0.0 for Neurodesk App version 1.0.0). Enter release title and release notes. Release needs to stay as pre-release for GitHub Actions to be able to attach installers to the release.

  3. Make sure that application is building, installing and running properly.

  4. In the main branch, create a branch preferably with the name release-v<new-version>. Add a commit with the version changes in package.json file. This is necessary for GitHub Actions to be able to attach installers to the release. (for example "version": "1.0.0").

  5. GitHub Actions will automatically create installers for each platform (Linux, macOS, Windows) and upload them as release assets. Assets will be uploaded only if a release of type pre-release with tag matching the Neurodesk App’s version with a v prefix is found. For example, if the Neurodesk App version in the PR is 1.0.0, the installers will be uploaded to a release that is flagged as pre-release and has a tag v1.0.0. New commits to this branch will overwrite the installer assets of the release.

  6. Once all the changes are complete, and installers are uploaded to the release then publish the release.

Update MacOS certificate

Follow these step-by-step instructions to generate and export the required Macos certificate for Neurodesk App release.

  1. Launch the “Keychain Access” application on your Mac, go to “Certificate Assistant.”
  2. Request Certificate from Certificate Authority: Within “Certificate Assistant,” select “Request a Certificate from a Certificate Authority.”
  3. Follow the URL to access the Apple Developer website: https://developer.apple.com/account/resources/certificates/add, upload the generated certificate.
  4. After uploading the certificate, download the resulting file provided by the Apple Developer website.
  5. Import the Certificate in Keychain.
  6. Right-click the imported certificate in “Keychain Access.”, choose “Export” and save it in .p12 format.
  7. Convert the .p12 file to Base64 using the following command: openssl base64 -in neurodesk_certificate.p12

3 - Neurodesktop Dev

Testing the latest dev version of Neurodesktop

Building neurodesktop-dev

Dev builds can be triggered by Neurodesk admins from https://github.com/NeuroDesk/neurodesktop/actions/workflows/build-neurodesktop-dev.yml

Running latest neurodesktop-dev


docker pull vnmd/neurodesktop-dev:latest
sudo docker run \
  --shm-size=1gb -it --cap-add SYS_ADMIN \
  --security-opt apparmor:unconfined --device=/dev/fuse \
  --name neurodesktop-dev \
  -v ~/neurodesktop-storage:/neurodesktop-storage \
  -e NB_UID="$(id -u)" -e NB_GID="$(id -g)" \
  -p 8888:8888 -e NEURODESKTOP_VERSION=dev \


docker pull vnmd/neurodesktop-dev:latest
docker run --shm-size=1gb -it --cap-add SYS_ADMIN --security-opt apparmor:unconfined --device=/dev/fuse --name neurodesktop -v C:/neurodesktop-storage:/neurodesktop-storage -p 8888:8888 -e NEURODESKTOP_VERSION=dev vnmd/neurodesktop-dev:latest

4 - Transparent Singularity

For more advanced users who wish to use Transparent Singularity directly

Transparent singularity is here https://github.com/NeuroDesk/transparent-singularity/

This project allows to use singularity containers transparently on HPCs, so that an application inside the container can be used without adjusting any scripts or pipelines (e.g. nipype).

Important: add bind points to .bashrc before executing this script

This script expects that you have adjusted the Singularity Bindpoints in your .bashrc, e.g.:

export SINGULARITY_BINDPATH="/gpfs1/,/QRISdata,/data"

This gives you a list of all tested images available in neurodesk:


curl -s https://raw.githubusercontent.com/NeuroDesk/neurocommand/main/cvmfs/log.txt

Clone repo into a folder with the intended image name

git clone https://github.com/NeuroDesk/transparent-singularity convert3d_1.0.0_20210104


This will create scripts for every binary in the container located in the $DEPLOY_PATH inside the container. It will also create activate and deactivate scripts and module files for lmod (https://lmod.readthedocs.io/en/latest)

cd convert3d_1.0.0_20210104
./run_transparent_singularity.sh convert3d_1.0.0_20210104

Options for Transparent singularity:

  • --storage - this option can be used to force a download from docker, e.g.: --storage docker
  • --container - this option can be used to explicitly define the container name to be downloaded
  • --unpack - this will unpack the singularity container so it can be used on systems that do not allow to open simg / sif files for security reasons, e.g.: --unpack true
  • --singularity-opts - this will be passed on to the singularity call, e.g.: --singularity-opts '--bind /cvmfs'

Use in module system LMOD

Add the module folder path to $MODULEPATH

Manual activation and deactivation (in case module system is not available). This will add the paths to the .bashrc


source activate_convert3d_1.0.0_20210104.sh


source deactivate_convert3d_1.0.0_20210104.sif.sh

Uninstall container and cleanup


5 - Neurodesk CVMFS

How to interact with our CVMFS service.

5.1 - Setup CVMFS Proxy

Setup CVMFS Proxy server

If you want more speed in a region one way could be to setup another Stratum 1 server or a proxy. We currently don’t run any proxy servers but it would be important for using it on a cluster.

docker run --shm-size=1gb -it --privileged --user=root --name neurodesktop `
-v C:/neurodesktop-storage:/neurodesktop-storage -p 8888:8888 `

Setup a CVMFS proxy server

sudo yum install -y squid

Open the squid.confand use the following configuration

sudo vi /etc/squid/squid.conf
# List of local IP addresses (separate IPs and/or CIDR notation) allowed to access your local proxy
#acl local_nodes src YOUR_CLIENT_IPS

# Destination domains that are allowed
#acl stratum_ones dstdomain .YOURDOMAIN.ORG
#acl stratum_ones dstdom_regex YOUR_REGEX
acl stratum_ones dst

# Squid port
http_port 3128

# Deny access to anything which is not part of our stratum_ones ACL.
http_access deny !stratum_ones

# Only allow access from our local machines
#http_access allow local_nodes
http_access allow localhost

# Finally, deny all other access to this proxy
http_access deny all

minimum_expiry_time 0
maximum_object_size 1024 MB

cache_mem 128 MB
maximum_object_size_in_memory 128 KB
# 5 GB disk cache
cache_dir ufs /var/spool/squid 5000 16 256
sudo squid -k parse
sudo systemctl start squid
sudo systemctl enable squid
sudo systemctl status squid
sudo systemctl restart squid

5.2 - CVMFS architecture

CVMFS architecture

We store our singularity containers unpacked on CVMFS. We tried the DUCC tool in the beginning, but it was causing too many issues with dockerhub and we were rate limited. The script to unpack our singularity containers is here: https://github.com/NeuroDesk/neurocommand/blob/main/cvmfs/sync_containers_to_cvmfs.sh

It gets called by a cronjob on the CVMFS Stratum 0 server and relies on the log.txt file being updated via an action in the neurocommand repository (https://github.com/NeuroDesk/neurocommand/blob/main/.github/workflows/upload_containers_simg.sh)

The Stratum 1 servers then pull this repo from Stratum 0 and our desktops mount these repos (configured here: https://github.com/NeuroDesk/neurodesktop/blob/main/Dockerfile)

The startup script (https://github.com/NeuroDesk/neurodesktop/blob/main/config/jupyter/before_notebook.sh) sets up CVMFS and tests which server is fastest during the container startup.

This can also be done manually:

sudo cvmfs_talk -i neurodesk.ardc.edu.au host info
sudo cvmfs_talk -i neurodesk.ardc.edu.au host probe
cvmfs_config stat -v neurodesk.ardc.edu.au

5.3 - Setup Stratum 0 server

Host a Stratum 0 server

Setup a Stratum 0 server:

Setup Storage

(would object storage be better? -> see comment below under next iteration ideas)

lsblk -l
sudo mkfs.ext4 /dev/vdb
sudo mkdir /storage
sudo mount /dev/vdb /storage/ -t auto
sudo chown ec2-user /storage/
sudo chmod a+rwx /storage/
sudo vi /etc/fstab
/dev/vdb  /storage    auto    defaults,nofail   0  2

Setup server

sudo yum install vim htop gcc git screen
sudo timedatectl set-timezone Australia/Brisbane

sudo yum install -y https://ecsft.cern.ch/dist/cvmfs/cvmfs-release/cvmfs-release-latest.noarch.rpm
sudo yum install -y cvmfs cvmfs-server

sudo systemctl enable httpd
sudo systemctl restart httpd

# sudo systemctl stop firewalld

# restore keys:
sudo mkdir /etc/cvmfs/keys/incoming
sudo chmod a+rwx /etc/cvmfs/keys/incoming
cd connections/cvmfs_keys/
scp neuro* ec2-user@
sudo mv /etc/cvmfs/keys/incoming/* /etc/cvmfs/keys/

#backup keys: 
#mkdir cvmfs_keys
#scp opc@* .

sudo cvmfs_server mkfs -o $USER neurodesk.ardc.edu.au

cd /storage
sudo mkdir -p cvmfs-storage/srv/
cd /srv/
sudo mv cvmfs/ /storage/cvmfs-storage/srv/
sudo ln -s /storage/cvmfs-storage/srv/cvmfs/

cd /var/spool
sudo mkdir /storage/spool
sudo mv cvmfs/ /storage/spool/
sudo ln -s  /storage/spool/cvmfs .

cvmfs_server transaction neurodesk.ardc.edu.au

cvmfs_server publish neurodesk.ardc.edu.au
sudo vi /etc/cron.d/cvmfs_resign
0 11 * * 1 root /usr/bin/cvmfs_server resign neurodesk.ardc.edu.au
cat /etc/cvmfs/keys/neurodesk.ardc.edu.au.pub
-----END PUBLIC KEY-----

Next iteration of this:

use object storage?

  • current implementation uses block storage, but this makes increasing the volume size a bit more work
  • we couldn’t get object storage to work on Oracle as it assumes AWS S3

Optimize settings for repositories for Container Images

from the CVMFS documentation: Repositories containing Linux container image contents (that is: container root file systems) should use overlayfs as a union file system and have the following configuration:


Extended attributes of files, such as file capabilities and SElinux attributes, are recorded. And previous file system revisions can be accessed from the clients.

Currently not used

We tested the DUCC tool in the beginning, but it was leading to too many docker pulls and we therefore replaced it with our own script: https://github.com/NeuroDesk/neurocommand/blob/main/cvmfs/sync_containers_to_cvmfs.sh

This is the old DUCC setup

sudo yum install cvmfs-ducc.x86_64
sudo -i
dnf install -y yum-utils 
yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo
dnf install docker-ce docker-ce-cli containerd.io
systemctl enable docker
systemctl start docker
docker version
docker info

# leave root mode

sudo groupadd docker
sudo usermod -aG docker $USER
sudo chown root:docker /var/run/docker.sock
newgrp docker

vi convert_appsjson_to_wishlist.sh
export DUCC_DOCKER_REGISTRY_PASS=configure_secret_password_here_and_dont_push_to_github
cd neurodesk
git pull
cvmfs_ducc convert recipe_neurodesk_auto.yaml
cd ..

chmod +x convert_appsjson_to_wishlist.sh

git clone https://github.com/NeuroDesk/neurodesk/

# setup cron job
sudo vi /etc/cron.d/cvmfs_dockerpull
*/5 * * * * opc cd ~ && bash /home/opc/convert_appsjson_to_wishlist.sh

#vi recipe.yaml

##version: 1
#user: vnmd
#cvmfs_repo: neurodesk.ardc.edu.au
#output_format: '$(scheme)://$(registry)/vnmd/thin_$(image)'
#- 'https://registry.hub.docker.com/vnmd/tgvqsm_1.0.0:20210119'
#- 'https://registry.hub.docker.com/vnmd/itksnap_3.8.0:20201208'

#cvmfs_ducc convert recipe_neurodesk.yaml
#cvmfs_ducc convert recipe_unpacked.yaml

5.4 - Setup Stratum 1 server

Host a Stratum 1 server

The stratum 1 servers for the desktop are configured here: https://github.com/NeuroDesk/neurodesktop/blob/main/Dockerfile

If you want more speed in a region one way could be to setup another Stratum 1 server or a proxy.

Setup a Stratum 1 server:

sudo yum install -y https://ecsft.cern.ch/dist/cvmfs/cvmfs-release/cvmfs-release-latest.noarch.rpm
sudo yum install -y cvmfs-server squid
sudo yum install -y python3-mod_wsgi 

sudo sed -i 's/Listen 80/Listen' /etc/httpd/conf/httpd.conf

set +H
echo "http_port 80 accel" | sudo tee /etc/squid/squid.conf
echo "http_port 8000 accel" | sudo tee -a /etc/squid/squid.conf
echo "http_access allow all" | sudo tee -a /etc/squid/squid.conf
echo "cache_peer parent 8080 0 no-query originserver" | sudo tee -a /etc/squid/squid.conf
echo "acl CVMFSAPI urlpath_regex ^/cvmfs/[^/]*/api/" | sudo tee -a /etc/squid/squid.conf
echo "cache deny !CVMFSAPI" | sudo tee -a /etc/squid/squid.conf
echo "cache_mem 128 MB" | sudo tee -a /etc/squid/squid.conf

sudo systemctl start httpd
sudo systemctl start squid
sudo systemctl enable httpd
sudo systemctl enable squid

echo 'CVMFS_GEO_LICENSE_KEY=kGepdzqbAP4fjf5X' | sudo tee -a /etc/cvmfs/server.local
sudo chmod 600 /etc/cvmfs/server.local

sudo mkdir -p /etc/cvmfs/keys/ardc.edu.au/

echo "-----BEGIN PUBLIC KEY-----
-----END PUBLIC KEY-----" | sudo tee /etc/cvmfs/keys/ardc.edu.au/neurodesk.ardc.edu.au.pub

sudo cvmfs_server add-replica -o $USER /etc/cvmfs/keys/ardc.edu.au

# CVMFS will store everything in /srv/cvmfs so make sure there is enough space or create a symlink to a bigger storage volume
# e.g.:
<!-- cd /storage
sudo mkdir -p cvmfs-storage/srv/
cd /srv/
sudo mv cvmfs/ /storage/cvmfs-storage/srv/
sudo ln -s /storage/cvmfs-storage/srv/cvmfs/ -->

sudo cvmfs_server snapshot neurodesk.ardc.edu.au

echo "/var/log/cvmfs/*.log {
}" | sudo tee /etc/logrotate.d/cvmfs

echo '*/5 * * * * root output=$(/usr/bin/cvmfs_server snapshot -a -i 2>&1) || echo "$output" ' | sudo tee /etc/cron.d/cvmfs_stratum1_snapshot

sudo yum install iptables
sudo iptables -t nat -A PREROUTING -p tcp -m tcp --dport 80 -j REDIRECT --to-ports 8000

sudo systemctl disable firewalld 
sudo systemctl stop firewalld 
# make sure that port 80 is open in the real firewall

sudo cvmfs_server update-geodb