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Category Archives: Local IT systems
Purge of legacy automount information
It is believed that the last systems using the old “indirect” autofs LDAP tables have been shut down or moved to use “direct” filer mounts, so the information is no longer included in the LDAP data. If anyone observes failure … Continue reading
Xen Server problems – please report anomalies
We have had a number of problems with one of our Xen pools. If any VMs appear to be behaving oddly, please contact sys-admin.
CentOS5 (Linux server) network service problems.
A Redhat package problem caused CentOS 5 machines (Linux Servers) to loose access to certain network services. One of our two mail servers may have rejected email between 04:15 and 04:30, when the problem was spotted and the failing MTA … Continue reading
DNS resolvers now validating
The CL DNS resolvers have DNSSEC validation enabled. Please report any DNS problems to sys-admin.
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Remote backups resumed
The regular remote backups that were suspended on 30th January have now resumed. In particular home directories are now up to date on the remote server and should continue to be backed up hourly. Some snapshots with non-standard names will … Continue reading
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IPv6 address changes
There has recently been a change to the IPv6 address allocations used in the University, though at present this affects relatively few people. The reason for the change is that the original allocation to Cambridge was not thought to be … Continue reading
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Problem with remote backups
Since the morning of Monday 30th January, we have had a problem with the offsite backup system; a number of filesystems, including the one containing user home directories, are not being copied to the offsite server. The problem began when … Continue reading
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Network problem 2011-11-25
There was a major problem with the CL internal network during the afternoon of Friday 25th November, believed to have been caused by a faulty switch. There were a number of consequential side effects on other systems, which we now … Continue reading
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Unix group cleanup
On departmental Linux systems, many Unix groups have been added locally, to facilitate groups of users jointly editing files. Use the shell command “id” to see which groups you are a member of. To avoid malfunctions, we now need to … Continue reading
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CentOS 5.7 released – kernel lock bug fixed
Although not yet announced on the CentOS web site, CentOS 5.7 has been released, which includes a new kernel which fixes the bug which caused the machine to OOPS if an NFS file lock was attempted. As such, there will … Continue reading