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Logging In To Fermilab Nodes

Fermilab maintains several machines for interactive login by Mu2e members. The full suite of Mu2e software and development tools is deployed on these machines. Mu2e members may compile, link and run Mu2e code on these machines and they may also submit grid jobs. This web page describes how to log in to these machines.

Table of Contents


The interactive login nodes come in two groups:

  1. This is a pool of virtual machines within the General Purpose Computing Farm (GPCF), the main interactive computing facility for use by the Intensity Frontier experiments. If you login to mu2evm you will be assigned to one of the machines in the pool, currently mu2egpvm01 through 05.
  2. This is a 32 core machine with no OS virtualization. The home disk and the scratch disk on this machine are different from those seen by the GPCF machines. Otherwise this machine is identical to the GPCF machines, in particular they also see the mu2e bluearc disks.

For additional details of Fermilab supported computing resources that are available to Mu2e, see the web page about CPU, Disk and Tape available at Fermilab.

You can only log in to the above nodes if you have a Fermilab computer account. The only permitted access method is kerberized ssh.

Logging in from Linux or Macs

From a Unix or Mac system you need to issue the following commands to log into one of the Fermilab interactive machines:

> kinit -l 6d -f
> ssh -AKX -l your_kerberos_principal

The -f argument to kinit requests a forwardable kerberos ticket; this means that when you are logged in to your target machine you can request services that ask for kerberos authentication. Otherwise you just have permission to get into the machine, not to get further authorization once there. The -AK argument to ssh requests ssh to forward your forwardable ticket. The X argument might or might not be necessary: see the next section.

If your username on your desktop/laptop is he same as your kerberos principal, you may omit the "-l your_kerberos_principal".

You may need to download and install the current krb5.conf and consult the authentication page, this Mac kerberos article, the Mac at Fermilab page, and the web page with suggestions on how to resolve ssh problems.

9/2015 - Users switching from OSX 10.9.5 to OSX 10.10.5 have noticed that their ticket lifetime defaults to 10h instead of the 26h that is standard at the lab. The solution is to update krb5.conf. At this time, this official source was not up-to-date, so the working conf file had to be downloaded directly from the authentication expert, Frank Nagy.

1/2017: Problems logging into lab Linux machines from Sierra: the lab's offical answer

Allowing remote nodes to Open a Window on your Linux or Mac Laptop or Desktop

Mac OS X users can acquire the X.Org X Window System disk image at .

If you use Scientific Linux Fermi (SLF) it is normally configured so that when you use ssh on your laptop to log in to a remote node ( like detsim or one of the GPCF nodes), software running on that remote node is permitted to open a new window on your laptop display. If this does not work, add the -X or -Y options to your ssh command:

> ssh -X -AK -l your_kerberos_principal
On some very old versions of MAC OS you must run ssh from within an XTerm. If you run it from within a Terminal it will not be possible to have windows from the remote machine appear on your display.

kerberos ticket lifetimes on a Mac

As a linux system, a Mac may have keberos installed. You will probably need to download a custom. Some users have found that this default configuration

ssh on Very Old MACs

wThere were some issues related to older MACs running MAC OS X with a version earlier than Leopard. Since Snow Leopard all of these issues are resolved. Follow this link to find an explanation of how to access Fermilab machines using Macs running OS X Panther or earlier.

Logging in From PC's

Fermilab does not officially support logging in to one of the Mu2e interative nodes from a PC. We are trying to change this. Your options are:

Fermilab at Work ]  [ Mu2e Home ]  [ Mu2e @ Work ]  [ Mu2e DocDB ]  [ Mu2e Search ]

For web related questions:
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This file last modified Friday, 03-Feb-2017 16:54:59 CST
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