Author Archives: pb22

Network outages and consequences

As of about the 11th of March, we have been having a number of problems with servers crashing, machines misbehaving, network dropouts, things going slowly, etc.¬†We believe this to be due to some sort of local networking problem with the … Continue reading

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slogin-serv move to NFS sec=krb5

Any users of the “slogin-serv” service should be aware that changes are to be made which may require them to run “kinit” to access their home directory.

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Mail server replacement

The last exim3 MTA (whittlesey) is about to be replaced by an exim4 one (sutton). This should not cause any disruption, but please email sys-admin if you suspect any problems.

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slogin-serv* hosts IP addresses changing

The IP addresses associated with the slogin-serv* servers is changing as they are moving to a subnet for machines using NFS sec=sys. This may cause ssh to warn that that the IP address differs, but that the host key matches. … Continue reading

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WGB power outages

The WGB lost power on Wed 11th Aug 2010 and three times on Sat 14th due to the main 240v breaker in GN17 tripping, probably caused by a problem with the temperature sensor, from reports of other sites. It is … Continue reading

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New package signing key

A new key has been generated to sign all Lab packages (RPMs and .debs). This has been installed on most Lab managed machines. Private machines which use the Lab repositories will need to register the new key.

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CentOS 5.5 upgrades

CentOS machines are being rebooted to use the 5.5 kernel. Continue reading

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cron job migration from legacy servers

In preparation for decommissioning our older omnipotent servers, various cron jobs are being rehomed. This should not disrupt thing, but please let sys-admin know if there appear to be problems.

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Linux kernel vulnerability tweaks

Due to a Linux kernel vulnerability a number of machines have had mmap_min_addr set to 4096 or had modules.alias tweaked to disable some protocols.

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Main Lab web services use a pool

There are now four web servers running the same configuration which provide a pool from which the services (www.cl.cam.ac.uk, www.tex.ac.uk, etc) can be served.

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