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I’ve just visited the Australian Business and IT Expo (ABITE) [1]. I haven’t been to such an event for a while, but Peter Baker sent a link for a free ticket to the LUV mailing list and I was a bit bored to I attended. The event was a poor shadow on previous events that […] When configuring servers the trade-offs between RAM and disk are well known. If your storage is a little slow then you can often alleviate the performance problems by installing more RAM for caching and to avoid swapping. If you have more than adequate disk IO capacity then you can over-commit memory and swap out the […] For some time people have been telling me about the benefits of SpamAssassin (SA). I have installed it once for a client (at their demand and against my recommendation) but was not satisfied with the result (managing the spam folder was too complex for their users). The typical configuration of SA has it run after […] In a discussion which covered some of the differences between Linux and Windows, a Windows using friend asked me if I felt compassion for Windows users. I feel some compassion for people who have bad working environments. While using an operating system that has poor support for the business tasks does decrease the quality of […] One thing that I would like to get fixed for Lenny is the shared objects which can reduce the security of a system. Almost a year ago I blogged about the libsmpeg0 library which is listed as requiring an executable stack [1]. I submitted a two-line patch which fixes the problem while making no code […] The command “xm list” displays the number of seconds of CPU time used by each Xen domain. This makes it easy to compare the CPU use of the various domains if they were all started at the same time (usually system boot). But is not very helpful if they were started at different times. I […] I have just configured IPVS on a Xen server for load balancing between multiple virtual hosts. The benefit is not load balancing but management. With two virtual machines providing a service I can gracefully shut one down for maintenance and have the other take the load. When there are two machines providing a service a […] It’s widely regarded that the best practice is to set the time zone of a server to UTC if people are going to be doing sys-admin work from various countries. I’m currently running some RHEL4 servers that are set to Los Angeles time. So I have to convert the time from Melbourne time to UTC […] When installing Xen servers one issue that arises is how to assign MAC addresses. The Wikipedia page about MAC addresses [1] shows that all addresses that have the second least significant bit of the most significant byte set to 1 are “locally administered”. In practice people just use addresses starting with 02: for this purpose […] |
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