[Halld-offline] New: HOWTO Install and Use the CVMFS Client

[Mark Ito]

Folks,

I've written a new wiki page on HOWTO Install and Use the CVMFS Client 
<https://halldweb.jlab.org/wiki/index.php/HOWTO_Install_and_Use_the_CVMFS_Client>. 
There are two components to the instructions:

 1. Installing CVMFS: gives you a mount of /group/halld on your local
    machine.
 2. Running a Singularity container: gives you a CentOS 7 system,
    independent of whatever native system you are running.

With these two features, you basically get the ifarm on your local machine.

 From the wiki page:

    We use CVMFS to distribute our software at remote productions sites,
    like the OSG and NERSC. Binaries, resource files, CCDB SQLite, and
    helper scripts are all available via CVMFS. This HOWTO will describe
    how to install the CVMFS client on a local Linux machine. After
    that, all of the pieces needed to build and run GlueX software
    locally on the machine are available if the native OS is CentOS 7
    Linux. If some other OS is run on the local machine, and singularity
    is available, CVMFS itself will provide a CentOS 7 singularity
    container that can be used to run the GlueX software.

Let me know if you have questions or run into difficulties with the HOWTO.

   -- Mark



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