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HowTos

Monitoring nginx Server Statistics With rrdtool

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HowTos

Few days ago I have installed nginx on one of our adult projects as reverse proxy server and for static files management. Yesterday this server got 200Mbit/sec traffic and because all admins like to create miscellaneous graphs, I have decided to draw nginx stats on graphs to see server load not only in megabits and load averages. As the result, I have created perl script, which uses RRDs perl module to create and manage rrd-database and very beautiful graphs.

iptraf - A reliable network monitoring software for GNU/Linux

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HowTos

Linux has no dearth in utilities which aid a user in getting a snapshot of the network traffic which course through ones machine especially when one is connected to the internet. One such software which aids the user in keeping an eye on the exchange of IP packets to and from ones machine is IPTraf. This is a curses based menu driven utility which intercepts packets on the network and gives out information about it.

Mirror Your Web Site With rsync

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HowTos

This tutorial shows how you can mirror your web site from your main web server to a backup server that can take over if the main server fails. We use the tool rsync for this, and we make it run through a cron job that checks every x minutes if there is something to update on the mirror. Thus your backup server should usually be up to date if it has to take over.

Managing Disk Space with LVM

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HowTos

The Linux Logical Volume Manager (LVM) is a mechanism for virtualizing disks. It can create "virtual" disk partitions out of one or more physical hard drives, allowing you to grow, shrink, or move those partitions from drive to drive as your needs change. It also allows you to create larger partitions than you could achieve with a single drive.

Manipulating PDFs with the PDF Toolkit

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HowTos

Creating and reading PDF files in Linux is easy, but manipulating existing PDF files is a little trickier. Countless applications enable you to fiddle with PDFs, but it's hard to find a single application that does everything. The PDF Toolkit (pdftk) claims to be that all-in-one solution. It's the closest thing to Adobe Acrobat that I've found for Linux.

Jabber Transports (MSN, Yahoo, ICQ etc)

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HowTos

We've previously seen how to install the Jabber cross-platform, and open, chat server. Sadly - some people insist on using the closed source IM clients. What should we do?

How To Set Up A Loadbalanced High-Availability Apache Cluster

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HowTos

This tutorial shows how to set up a two-node Apache web server cluster that provides high-availability. In front of the Apache cluster we create a load balancer that splits up incoming requests between the two Apache nodes. Because we do not want the load balancer to become another "Single Point Of Failure", we must provide high-availability for the load balancer, too. Therefore our load balancer will in fact consist out of two load balancer nodes that monitor each other using heartbeat, and if one load balancer fails, the other takes over silently.

Mounting a fuse Filesystem from /etc/fstab

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Ubuntu
HowTos

Earlier on, I showed how-to mount a remote filesystem with fuse, using a remote partition accessible by SSH. Since version version 2.4.0, it is possible to use fstab to mount those kind of partition.

Install Linux Over the Internet

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HowTos

One of the best things about Linux is that its dozens of varied incarnations are generally available as free downloads on the Internet. But if your Internet connection is swift, and if you're only planning a one-time installation on a single computer, you can skip the disc image downloading and burning, and instead install Linux directly from an Internet server.

Understanding /proc: Part 2

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HowTos

As it was shown in the first installment of the Understanding /proc series, the /proc filesystem can be extremely useful when it comes to finding out about the processes running on your Linux system (which might have something to do with why the kernel developers decided to name it 'proc'). But /proc is also handy when it comes to learning about the devices on your system. While it is currently being deprecated in favor of the /sys filesystem for device information, /proc can still provide some valuable insight as to what you have attached to (or inside of) your computer.

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