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Introduction

Many problems in Earth Observation and modelling communities require a common processing algorithm independently applied to thousands (or millions!) of bits of input data.  A system to do this with many processing nodes is "High Throughput Computing" (vs "High Performance Computing", which concentrates on running large jobs that will not fit on a single machine on a pool of processing nodes, typically using MPI).

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Of course, any tenant can install their own batch processing systems for their own purposes with their own resources, but will not be able to take advantage of other shared resources in a centrally organised way.

General

EWC HTcondor is a managed service. The central manager node is deployed in a tenancy on the EWC. Users can join the existing pool adding compute and submit nodes.

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Some features of the HTCondor in EWC:

Execute nodes

• No access to execute host for containers​
• No access to other containers running on execute node​
• Isolated environment for containers​
• No autoscaling​
• No NFS

Submit nodes

• Only docker universe allowed​
• Only condor_submit command allowed​
• Private network in the tenancy enabled​ to allow access to tenancy-internal resources/files
• Condor transfer mechanism allowed

Deploy HTCondor nodes

Pre-requisite

Before deploying an HTcondor node, you need to create an htcondor specific security group. You can follow this page: Creating Security Groups in Morpheus to know how to create security groups.

• htcondor security group with the following rules:

Deploy execute or submit node

1. Go to Provisioning → Instances and click on Add+ to add a new instance
2. Select Htcondor Submit/Execute node

3. Fill data required:

   • plan: choose your plan
   • network: private
   • security group: htcondor, ssh (only for submit node)
     

   4. Finalize provisioning steps.

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# dockertest.sub -- example docker job

universe                = docker
docker_image            = debian
executable              = /bin/cat
arguments               = /etc/hosts
should_transfer_files   = YES
when_to_transfer_output = ON_EXIT
log                     = log/job_$(Process)_sleep.log
output                  = output/job_$(Process)_output.txt
error                   = error/job_$(Process)_errors.txt

request_cpus   = 1
request_memory = 1024M
request_disk   = 10240K

queue 10010

• use condor_submit <job_name>
• verify jobs are running, using condor_q command

Once execute node is up: you can check from a

• ssh into your submit node
• check if the node appears in the list of execute nodes, running condor_status

Test HTCondor

Docker universe job in HTCondor

Try this tutorialon how to create a container and push it to a registry using docker. Moreover it provides an example job that can be submitted to HTCondor.TBD