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

Administrative matters

Workstation provision

Systems software

Communications and the network


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[rss feed]Sys-admin news

18 Jul 2016

ssh-dss .dsa user ssh host keys to slogin-serv

The new Ubuntu 16.04 slogin-serv services do not accept the legacy ssh-dss (DSA) public key algorithm.
Any users having problems with their user ssh keys should try connecting to slogin-old using the -v switch to check which key is used.
If it is .dsa, please generate a new key and add it to .ssh/authorized_keys, check that it works on slogin-serv, then remove the old .dsa key and its .ssh/authorized_keys entry.
Remember never to copy the private key – it should only ever remain where it is generated.

7 Jul 2016

slogin server partial upgrade to Ubuntu 16.04

Subsequent to the move of slogin-serv to Ubuntu 14.04, another server has been added, which runs Ubuntu 16.04, accessible as, which has been in service for a while now without any reported problems. It is now being added to the pool, so users may get Ubuntu 14.04 or 16.04. The hope is that it should not matter, and when we are confident that 16.04 is suitable, the pool will move to being just 16.04.
If you find something which requires 14.04, please connect to and email the details to sys-admin

22 May 2016

new slogin-new – consider using slogin-serv

The service name ‘‘ is used for the newest slogin pilot or service for the department (see Time Sharing Syetsms).
A new system is in development, so anyone wanting to use the previous ‘new’ server sandy should use (using ssh user keys) or sandy (using Kereberos). TGT server users should check their configuration files.

25 Jun 2015

TexLive 2015 now available on the filer

The latest version of TeXLive is now available on the filer in /usr/groups/texlive.
Using the standard TeXLive naming convention, it is in the directory 2015. (more...)

28 May 2015

Disruption to Xen clients

Our Xen system was disrupted last night. It is believed to be mostly fixed, but users should check their systems.
A rogue process caused problems with the Lab routing, which caused the filer to be inaccessible, causing some domUs to deem their file systems broken. It is thought that most effected systems have been restarted, but there may still be problems which need fixing. Please email sys-admin if any help is needed.