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 will be email@example.com. However, that is not the only possibility. It's usually best to contact via a rôle address rather than guessing who is best-placed to answer your question: a list of rôle addresses may suggest where to look.
- The systems managers use a job-ticketing system to keep track of reported problems; it's useful to know how it behaves.
- 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.
- Web server information including how to export personal web pages files to the WWW and restrict access to them using .htaccess files and Raven passwords.
- Information for, and about, new arrivals at the Computer Lab. A selection of information, both technical and general, for new arrivals at the Computer Laboratory. This information is intended for everyone, visitors and longer-term residents. There is also information for the host of a visitor.
- Information for people leaving the Computer Lab, or moving into the Writing up/Hot Desk area.
- Equipment allocation, replacement and support
- Choice of Operating System on Lab managed machines
- For users of Unix systems. Redhat (Fedora and CentOS) and Ubuntu Linux. General information, software installation, configuration, applications.
- For users of Microsoft Windows systems. General information, access, applications.
- For users of private Macintosh OS/X systems Local configuration and integration information.
- Applications software, including MATLAB and Unix tools.
- Printing from Unix or Windows systems.
- Mail in the Computer Laboratory gives broad coverage of the facilities available.
Communications and the network
- Request a network connection.
- The Computer Lab network. An overview of the lab networks, both physical and wireless.
- The means of access to Computer Lab Systems, and other security related issues.
- Using the secure shell ssh to connect to the Laboratory.
- The one-time password system, that allows safe connection to lab unix systems in an insecure environment.
- Information about the Time Sharing Systems.
- Information about the File server and other file spaces.
- Disc usage and quota report (requires Raven).
- Users can boot a machine if it's off.
- For users of the Publicly-accessible scanners.
- For users of the Public CD/DVD writing machines.
- Specialist services such as SPSS, Adobe CS5 running under Windows.
- Public Windows Terminal Server machines.
- Video Conferencing Facilities
- Condor is a specialized batch system for managing compute-intensive jobs. We have a local Condor Pool running on the processor bank machines. In addition large memory multi-CPU virtual machines can be made available for those with specific computational needs that are not met by Condor. To request access to those contact firstname.lastname@example.org to discuss your requirements.
If you spot things missing from this page and its sub-pages, please notify email@example.com.
- Sys-admin news
24 Feb 2014
With the new routers, Lab machines lost the ability to NTP probe machines on the internet, as we lost stateful UDP reflexive rules.
With the recent NTP amplification attacks, we have added rules which mean that machines on the internet cannot NTP probe most Lab machines (our NTP servers should still be accessible).
Peerings (where source and destination ports are both 123) should still work.
18 Jan 2014
As part of a campaign to clear the use of the original lab subnet, IP address on VLAN 100 in the subnet 22.214.171.124/20 which are believed not to have not been used for a year have been removed from the DNS. Further pruning is likely in future. If you believe an address has been retired but is still needed, please email sys-admin
23 Dec 2013
The instance of wordpress used for http://www.cl.cam.ac.uk/news/ has been upgraded to 3.8.
Please report any problems to sys-admin.
15 Nov 2013
On Monday 18th November 2013 we plan to add a DS RR for cl.cam.ac.uk to the cam.ac.uk zone. This will mean that resolvers using DNSSEC will check our information, and ignore it if the information does not have a valid signature. Apart from making our information more secure, it also has the ability to take cl.cam.ac.uk out of the DNS if something goes wrong. Please report any DNS problems with cl.cam.ac.uk
18 Sep 2013
The filer is running slowly at the moment. This is because we’re copying
the entire filesystem to the replacement machine. The ultimate goal is
to make everything faster, but in the short term we have to suffer some