Inventor's Paradox

Background We have a three-server landscape that serves our internal applications. All of them were running nginx on RHEL linux. The nginx were installed from EPEL repository packages. Two days ago I updated the nginx in one server (lets say server A) in order to repackage it after enhancing it with HttpSubsModule, during the compilation process it complains about missing kernel functionality. For the compile to be success, I updated kernel-devel and kernel packages (in server A) to the latest one. After the compilation succeeded, I copied the resulting rpm to server B and installed it. The problem After reinstalling the rpm package in server B, I didn't remember to restart the nginx server. After installing new kernel in server A, I havent restarted it either. But the next day, because of one thing and another, server A got restarted, and the application on server A no longer works. Server B's nginx server also got restarted, and afterwards unable to serve any web pages...

The case I recently involved in a reverse proxy project using nginx as reverse proxy server. Turns out that nginx has a built in HttpSubModule that allow us to replace urls in http stream, which is a very important requirements for us.  But the problem is that the HttpSubModule only allow one replacement per location.  After a few searches, found that an additional HttpSubsModule (notice the additional s)  will do the task, allowing multiple replacement per location.The nginx wiki is kind enough to provide installation instructions for HttpSubsModule , but provides no rpm package. DISCLAIMER: This blog post shows step by step tutorial to produce a RPM package file. If you only interested in installing nginx with HttpSubsModule, please jump to the last heading 'Installation'. But if you're not on Centos 6 x86_64, maybe you really should follow all the steps anyway. Repository Hunt I prefer repository packages other than compiling manually. We found that EPEL re...