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NOX/Client installation

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ARC Client Download and Installation

The ARC client provide all middleware command line tools for proxy, job and data management.

While most on the client installation works out-of-the-box and one does not need administrator privileges, some small platform dependent setup steps may still be needed.


Client software

  • For the Nox 1.0.0 release, download the installer file and run it. It will install the ARC software as well as all needed dependencies and CA certificates.

Security: Personal certificates

Install Grid certificate (usercert.pem) and private key (userkey.pem) by copying them into a .globus directory in your home directory:

On Windows XP:

Copy your usercert.pem file to: C:\Documents and Settings\<username>\.globus\usercert.pem
Copy your userkey.pem  file to: C:\Documents and Settings\<username>\.globus\userkey.pem

On Vista and later:

Copy your usercert.pem file to: C:\Users\<username>\.globus\usercert.pem
Copy your userkey.pem  file to: C:\Users\<username>\.globus\userkey.pem

NB! One may have problems with making a .globus file (starting with a dot) using the explorer. Open a DOS prompt and make the directory

  cd C:\Documents and Settings\<username> 

  Vista, 7:

  cd C:\Users\<username>

  mkdir .globus


Standalone client package

The Linux standalone client is conceptually similar to Windows installation in the sence that it contains all the necessary pre-compiled software. It is distributed as a tar ball and can be installed at any location and does not require root privileges.

  • Download the .tgz package corresponding to your OS through NorduGrid downloads server (look for nordugrid-arc-nox software)
  • Place the tar-ball containing the standalone client in any suitable place and unpack.
tar -xzf nordugrid-arc-nox-standalone-<version>.tgz
cd nordugrid-arc-nox-standalone

In C-shell, you will need to run "source setup.csh"

Client from repository

  • Configure the repository as indicated in the Configuration guide. The following methods are supported:
RPM and DEB repositories for ARC
Repository Command
yum yum install nordugrid-arc-nox-client
up2date up2date @"ARC Client"
apt apt-get install nordugrid-arc-nox-client

If you want to be able to use production ARC sites and existing storage (e.g. in NDGF), you will need Globus plugins as well:


If one wants to use the Python arclib wrappers, an additional package is needed:


And guess what, with this package you also get Chelonia, the self healing ARC storage system. Totally free of charge!

A complete example with yum:

yum install nordugrid-arc-nox-client nordugrid-arc-nox-python nordugrid-arc-nox-plugins-globus

Security: Private keys and CA certificates

  • Install your private and public keys (userkey.pem and usercert.pem) in $HOME/.globus
    • You can install them anywhere else and with any other name, but make sure to define the following environment variables:
      • X509_USER_KEY points to your private key location (usually $HOME/.globus/userkey.pem)
      • X509_USER_CERT points to your public certificate location (usually $HOME/.globus/usercert.pem)
  • It is absolutelly necessary to install keys of potentially relevant Certification Authorities. These are packaged only for RPM-based distributions and inside standalone packages, so in case you install from source or for Debian/Ubuntu, you'll need to do:
  tar xvzf igtf-policy-installation-bundle-1.32.tar.gz
  cd igtf-policy-installation-bundle-1.32
  ./configure --with-profile=classic
  sudo make install

You may need to browse to that repository first and find out what is the most recent version number, instead of 1.32

Bear in mind that this will install more CA keys than you'll ever need.


  • There are no separate client packages for Mac OS X, so you'll have to install the entire NOX. Follow instructions for Mac OS X, both Leopard and Snow Leopard

Client Configuration

The client will at the first run create a configuration directory in your home directory called .arc .

Location on Microsoft Windows XP:

C:\Documents and Settings\<username>\Application Data\.arc

Location on Microsoft Windows Vista and 7:


Location of Linux systems:


First time one runs a arc command the client will provide you with a default client configuration file client.conf

You can uncomment various options. Below is an example of some working default settings:

defaultservices=index:ARC0:ldap://,o=grid computing:ARC1: 


For detailed description of configuration options, refer to the ARC Client manual.


In order to use VOMS proxy one has to create a .voms directory in the home directory and place there a file with the name vomses.

Location on Microsoft Windows XP:

C:\Documents and Settings\<username>\Application Data\.voms\vomses 

Location on Microsoft Windows Vista and 7:


Location of Linux systems:


This file contains a list of the virtual organizations where you are a member, for example:

"atlas" "" "15001" "/DC=ch/DC=cern/OU=computers/" "atlas"
"atlas" "" "15001" "/DC=ch/DC=cern/OU=computers/" "atlas"
"knowarc" "" "15001" "/O=Grid/O=NorduGrid/CN=host/" ""

For more details about VOMS, refer to VOMS Usage Notes.

Job list

As one starts submitting jobs the client will keep track of them in a file called jobs.xml in the .arc directory placed in your home area. If one wants a clean start without error messages related to jobs that may be old and removed from the servers, it is possible to simply remove the file.