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 firstname.lastname@example.org. 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 email@example.com to discuss your requirements.
If you spot things missing from this page and its sub-pages, please notify firstname.lastname@example.org.
- Sys-admin news
18 Jul 2014
The report I have received from the UIS about today’s wireless outage is slightly inconclusive. It seems that there was a malfunction of the central controller that looks after our access points, causing them to reboot and go into a default unconfigured state. They were initially rescued by moving them to another controller, but have now been put back as they should be without further problems. (more...)
2 Jul 2014
The main Lab Linux TSS is currently running CentOS 5. We plan to move to Ubuntu Server 14.04 LTS, so have set up a testing server “sandy” (AKA slogin-new and ssh-remote-2.cl.cam.ac.uk). Please try it out and report any problems to sys-admin.
28 Apr 2014
The server providing the www-dyn1 and www-dyn services is to be upgraded. Users are recommended to check that any pages they publish work on the www-dyn2 and www-dyn3 servers. See http://www.cl.cam.ac.uk/local/web/personal.html#www-dyn for full details.
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 184.108.40.206/20 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