When installing third-party applications, they often default to running as root. The server applications for TeamSite/LiveSite are among those. I have applied a simple modification to the init.d scripts that starts them as a non-root user. It also allows the scripts to be run by members of an administration group via sudo. This approach is […]
i recently had an issue with frequent login attempts against on of my services. These were almost all from countries that should not be accessing my service. To resolve the issue I implemented geo blocking with TCP Wrappers. This is how I went about geo blocking connections.
This post will be continually developed. I recently designed some solutions to solve some issues with init.d and setup scripts. These may be of use to others, and I will likely reuse them.
This article provides a quick overview of the DNS records required for an email server and presents a minimal sample configuration. The example assumes that you are running servers for both email and the web. Comments indicating the changes if you are using a third party provider are provided.
I recently completed a garbage collection exercise on a variety of applications. In all, twenty WebLogic application clusters were tuned. A dozen of these are large busy application clusters. These provide a mix of Web Applications and Web Services. Tuning garbage collection is a matter of trade-offs. Large heaps take longer to garbage collect. Small […]
A StackExchange question on using HAProxy’s capture feature to pass data from TCP mode to HTTP mode prompted me to update my SSL configuration. This was intended to get an A+ rating from SSL Labs by sending non-SNI capable clients to a server with weaker ciphers. This was to enable clients on WinXP/IE8, Java 6, […]
I’ve done a little tuning to my WordPress setup. In order to keep up to date, I’ve switched from the Ubuntu installation to a downloaded installation under /opt/wordpress. This is owned by my user and served by apache running as www-data. Updates are done using the sftp add-on. Securing /opt/wordpress I added myself to the […]
When I need a new tool, I often code it in Python. Often, command line options are useful. Sometimes it is possible to have a fixed set of parameters, but this is not very flexible. Fortunately, Python has standard libraries to handle parsing command lines. There are three libraries providing varying capabilities. Some of the […]
There are many tools available that will allow a programmer to create log entries. I originally worked with log4j, but have recently been working with logback. I am also working with Jython and am looking at Python’s logging framework. Used well they can make log analysis simple and provide a rich tool for resolving issues. […]
A recent kernel change broke my CPU performance tuning. I have an AMD processor which presents 4 cores to the kernel. The process in this article should work for Intel processors although the governors and CPU settings tree may be different. Different kernels may also have different settings. The current kernel allows setting the governor per […]