While debugging the syslog-ng issue I mentioned previously, I needed to be able to observe the syslog-ng pattern matches as they occurred. The syslog-ng daemon has a couple of useful options to assist with this. The first is the “-e” option, which causes the daemon to log to stdout. The second is the “-F” option, [...]
I came across an awesome Q&Q where Tim Mueting from AMD described the hardware virtualization features in AMD Opteron CPUs. The following excerpt from the interview was especially interesting:
“Prior to the introduction of RVI, software solutions used something called shadow paging to translate a virtual machine “guest” physical address to the system’s physical address. Because [...]
Linux comes with a slew of mount options, several of which are useful for locking down what can and can’t happen inside a file system. Three options I find super useful are noexec, nosuid and nodev. The noexec option disables execution for files that reside within a file system, nosuid disables execution of setuid executables [...]
I have posted a lot of material to my website over the past few years, and needed a way to easily locate content. To make finding material super easy, I recently added a global search page. I’m not sure if folks will find this useful, but I thought I would throw it out there in [...]
I have been experimenting with lxc-containers, which use a number of features in the latest 2.6 kernels (specifically, namespaces). To ensure that I have the latest bug fixes and performance enhancements, I have been rolling my own kernels. This has been remarkably easy, since the Makefile that ships with the kernel has an option to [...]
While perusing the Linux change list, I noticed that boot tracing was introduced in the 2.6.28 kernel:
“The purpose of this tracer is to helps developers to optimize boot times: it records the timings of the initcalls. Its aim is to be parsed by the scripts/bootgraph.pl tool to produce graphics about boot inefficiencies, giving a visual [...]
