CPU vs RAMCPU vs RAM
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[...]
SpamAssassin During SMTPSpamAssassin During SMTP
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[...]
Compassion for Windows UsersCompassion for Windows Users
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[...]
Executable Stacks in LennyExecutable Stacks in Lenny
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[...]
Xen CPU use per DomainXen CPU use per Domain
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[...]
A Basic IPVS ConfigurationA Basic IPVS Configuration
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[...]
Time Zones and Remote ServersTime Zones and Remote Servers
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.[...]
A New Strategy for Xen MAC AllocationA New Strategy for Xen MAC Allocation
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[...]
New HP ServerNew HP Server
I’ve just started work on a new HP server running RHEL5 AS (needs to be AS to support more than 4 DomU’s). While I still have the Xen issues that[...]
Lenny SE Linux on the DesktopLenny SE Linux on the Desktop
I have been asked about the current status of Lenny SE Linux on the Desktop. The first thing to consider is the combinations of policies and configurations. I will number[...]