ASCI, a Service Catalog for Docker

Mr John Marcou1, Robbie Clarken1, Ron Bosworth1, Andreas Moll1

1Australian Synchrotron, Melbourne, Victoria, robbie.clarken@synchrotron.org.au, john.marcou@synchrotron.org.au, ron.bosworth@synchrotron.org.au, andreas.moll@synchrotron.org.au

 

MOTIVATION

The Australian Synchrotron Computing Infrastructure (ASCI) is a platform to deliver users easy access to a remote desktop to process their experiment  data. Every experiment  station, or beamline, can start and connect to their own desktop environment with a web-browser, find their specific processing applications, and access their experiment data.

ASCI acts as a Service Catalog for Docker. It is used to start remote interactive desktops or processing services which run inside Docker containers.

KEY FEATURES

  • Remote Desktop instances
  • Web-browser based
  • User home folders
  • Desktop sharing feature between users
  • CUDA and OpenGL on NVIDIA support
  • Run multiple sessions on multiple nodes in parallel
  • Label-based scheduler to distribute the load on cluster

ARCHITECTURE

ASCI is a stateless  micro-services  solution.  Every  component  runs within  a Docker container.  The  infrastructure   is  based  on  the  CoreOS  Container  Linux  operating system, providing the main tooling to run containerized  applications.  This operating system is deployed using Terraform which is an infrastructure management tool supporting  multiple  providers,  and  allows  automated  machine  deployment.  With ASCI,  we  use  Terraform  manifests  to  deploy  CoreOS  Container  Linux  to  virtual machines on VMware vSphere cluster, or as stateless operating system on bare-metal, using CoreOS Matchbox.

THE CONTROL PLANE

The ASCI Control Plane provides two main components:

  • the ASCI Web UI contacts the ASCI API to interact with ASCI and start Desktops
  • the ASCI API contacts the Docker API on the compute nodes to schedule and manage new ASCI instance

All the proxy elements are used to route the request within the infrastructure in order to reach the Web-UI or a specific Desktop. The ASCI Admin UI is a convenient way to customize the scheduler and list the running ASCI instances.

THE DESKTO

The user connects to a web-interface which lists the environments available for creation. When a desktop is requested, the ASCI API schedules the Docker container on the cluster. When the user connects to a desktop, the ASCI API generates a one-time-password  and which is delivered to the user’s  web-browser  to establish  a VNC connection over WebSockets (noVNC).

The desktop  instance  is running  in a Docker  container.  A base image is built with standard tools and libraries, shared by  every  environment,   such  as  the  NVIDIA,  CUDA  and VirtualGL libraries, and the graphical environment (MATE).

This  image  is  use  as  parent  for  every  child  environment, which provides specialised scientific applications.

Users can store their documents in their home folder. The sharing feature allow users to share their Desktop with others.

 

 

                                                                                                                                                                             ASCI architecture

 

OPENGL SUPPORT

Supporting OpenGL is complex since the Xorg implementation doesn’t allow multiple desktops attached to the same GPU to process GLX instructions. A solution is the VirtualGL approach. Under this system there is a single GPU- attached Xorg server, called 3DX, and multiple non-GPU desktops, called 2DX. When an application started on a 2DX desktop needs to process a GLX instruction, the VirtualGL library catches and forwards the instruction to the 3DX server for processing on the GPU.

VirtualGL architecture


I
NFRASTRUCTURE SERVICES

ASCI relies on the following infrastructure services:

  • DNSmasq provides DNS resolution for the ASCI DNS sub-domain
  • BitBucket is the Git repository manager used is this environment
  • ASCI delivered applications are built as RPM packages which are stored on a local YUM Repository
  • Autobuild is an application which builds Docker image on new commit event, and push them to the Docker Registry
  • Docker Registry stores the Docker images. These images are downloaded as needed by the Docker hosts
  • Matchbox  is  the  PXE  server  to  provide  Boot-On-Lan.  It  is  configurable  via  API.  This  system  is  used  to  boot  ASCI workers on the network

 The monitoring solution is built with these components:

  • JournalBeat  and  MetricBeat  run  on  every  monitored  system  and  collect  log  and  metrics  to  send  to  the  logging database
  • HeartBeat monitors a list of services to report theirs state in the logging database
  • ElasticSearch is a search engine used to store and index logs and metrics
  • Kibana is a Web interface for ElasticSearch
  • ElastAlert, the alert manager, watches logs and metrics to trigger alerts and notifications based on rules

 


Biography:

I work at the Australian Synchrotron as DevOps/HPC engineer.

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