This is intended as a step-by-step guide to what to do when things go wrong using NFS. Usually trouble first rears its head on the client end, so this diagnostic will begin there...
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Already happy with nginx in front of Apache for a number of sites, I decided it was time to start testing nginx/fastcgi on my personal server (the serial crash test dummy of my web operations). The only problem: I have yet to find a sensible method of grabbing useful runtime information from the PHP fastcgi process itself, and if you can’t sensibly watch it, you can’t sensibly deploy it.
In this lesson of the MySQL tutorial, you will learn...
1. To start up and shut down the MySQL Server
2. To view Information about the Server and Databases
3. To view and kill Threads
4. To clear System Caches
5. Various mysqladmin Options
The new release of PHP 5.3 brought many important additions and changes to PHP. Although longly awaited, some of the changes are not backwards compatible. Thus, code that worked fine with 5.2 may produce warnings or fail in 5.3.
Quick research shows that most prominent applications had to be patched or changed, even though minimally, to work cleanly with 5.3. To help people to convert their web applications to 5.3, I present here a migration script that would allow you to inspect your applications for potential migration problems.
A basic Varnish installation consist of Varnishing sitting in from of your web server (referred to as back-end), clients will interact solely with Varnish and never know there is a back-end web server (nor should they have access to the back end directly). When a request comes in to Varnish for a page that is being cached over a standard HTTP connection Varnish will either service this directly to the client (without sending a request to the back-end) from Varnish’s cache if exist or if not in cache will send a request to your web back-end over its TCP socket via an HTTP request...
“Ka-chunk... ka-chunk... ka-chunk... tick... tick... tick... Ka-chunk... ka-chunk...” That's just not a sound you ever want to hear coming from a hard drive. It's the sound of a hard drive trying to move it's read/write heads into a position that they don't seem to want to go to or its trying to read a sector that just isn't there anymore. Of course, modern hard drives have come a long way and are amazingly reliable, but if you work with computers long enough, you're bound to have one fail on you.
This article describes what actions might be taken when smartmontools detects a bad block on a disk. It demonstrates how to identify the file associated with an unreadable disk sector, and how to force that sector to reallocate.
A collection of 30 free tutorial books by Herong Yang on latest programming technologies. Tutorials in all books are based on Herong's personal experience and ideal for developers to learn new programming technologies.
If you are using VPS with very limited memory resources, the link provides excellent reference material on troubleshooting memory issues with some of the know applications that can possibly consume high memory.
The bash shell is just amazing. There are so many tasks that can be simplified using its handy features. This tutorial tells about some of those features, explains what exactly they do and learns you how to use them.