Computer Laboratory

Local System Information

This page offers pointers to detail of how to use lab systems, how to get help, and so on.

Getting help and introductory documents

  • Getting help: The main contact address is sys-admin@cl.cam.ac.uk. You should always send email to that address rather than to a specific member of the support team as your request can then be dealt with by the most appropriate person. Emails to that address are fed into out job-ticketing system - it is important not to reply to old tickets with new issues nor to alter the subject line in the replies you recieve back via the ticketing system. Requests sent to to that address are processed by the person currently on the help-desk. So expect to have interactions with more than one person to resolve a fault - especially if it is a specialist issue or a complex one. During term time the help-desk runs in both the mornings and afternoons (see schedule). Outside of term we aim to cover at least one of the morning or afternoon sessions each day.
  • An introduction to computing facilities is an on-line copy of the booklet new users are given.
  • The Frequently Asked Questions list.
  • The local system administration pages A to Z list.

Administrative matters

Workstation provision

Systems software

Communications and the network

Facilities

If you spot things missing from this page and its sub-pages, please notify sys-admin@cl.cam.ac.uk.

[rss feed]Sys-admin news

23 Oct 2014

Matlab updated to R2014b

The version of Matlab used on lab Linux systems has been updated from R2013b to R2014b. (more...)

22 Oct 2014

Removal of avahi-daemon from Ubuntu 14.04 systems

It appears that the avahi-daemon causes the gtk+ library on Ubuntu 14.04 systems used by many GUIs  (e.g. firefox and chrome) to hammer the print spooler by opening hundreds of simultaneous connections, causing the GUI to crash. To avoid this, we are removing the avahi-daemon on all Ubuntu 14.04 systems. If you manage a machine which needs it, simply add ‘avahi-daemon’ to /etc/user-config/bundles as usual. and it will be auto-installed. (more...)

24 Sep 2014

Internal Lab facilities may not be available

Certain commands used to do “privileged” things within the Lab may not be working for a while. If some feature you particularly need does not work, please email details to sys-admin

16 Sep 2014

condor pool moved to NFS sec=krb5

As emailed to all recent users of condor, the execute machines have now moved to NFS sec-krb5. The documentation has been updated. If anyone has problems, please email sys-admin.

5 Sep 2014

network and Xen problems

A misconfiguration in the networking kit caused an outage yesterday afternoon. This caused many Linux Xen VMs to loose access to their root filesystems, so they mounted them read-only. After rebooting some of them, one of the Xen Servers lost the ability to reboot VMs, so itself had to be rebooted, causing all its VMs to crash. Many of the filesystems were deemed “unfixable” by fsck, so fsck had to be manually run before the systems rebooted.
Please let sys-admin know of any remaining problems.