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Background

Files stored in Stash can be accessed by jobs running on OSG via the HTTP (web) commands wget and curl.

Preliminaries

Before getting started, users should login to login01.osgconnect.net and get a copy of the tutorial files:

Set up tutorial files

Making data accessible over HTTP

All user accounts on OSG-Connect have a directory that is automatically web accessible.  This directory is located at ~/data/public.  To make a file or directory accessible, copy it to this directory or a subdirectory of this directory and give files permissions of 644 and directories permissions of 755.  E.g. :

Making file accessible on HTTP

Accessing data from stash over HTTP within jobs

The final part of this section covers getting data within stash to jobs running on OSG using HTTP access.  This example will show the user how to access stash over HTTP within jobs.  The primary component of this example is the shell script that is run on the compute node.  It downloads the random_words data file and then generates a histogram with the most common words found in the file.  Before running this example, app_script.sh needs to be edited to replace username with the user's username:

app_script.sh

Next edit the application/application.submit file and replace PROJECT_NAME with the appropriate project name:

application.submit

Once that change has been made, submit the file:

Running random words application

Once the jobs are completed, users can look at the output in the logs directory and verify that the job ran correctly:

Verifying job completion

 

 

 

 

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