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Search results for Execute Commands on Multiple Linux or UNIX Servers part II

Debian

Installation of Tacacs+, Rancid, Cvsweb

Post date: August 16, 2006, 16:08 Category: Network Views: 12275 Comments
Tutorial quote: This article will describe you how to install a complete solution to manage users that have access to your network devices and also how to backup your network devices configurations with a cvs based storage in order to have diffs on it. You'll also be able to script commands you want to run on your routers/switches to have easier administration.
Linux

The Linux /proc Filesystem as a Programmers' Tool

Post date: June 22, 2005, 09:06 Category: Programming Views: 4063 Comments
Tutorial quote: My entry into systems programming was guided by my desire to understand further the operating systems I was working with daily as a contract UNIX and, later, Linux system administrator. The result of this was ifchk, a packet sniffer detector I wrote in C and released in June of 2003. ifchk initially was written under IRIX and then ported to Linux, mostly under the 2.4 kernel. The current ifchk revision, beta 4, recently was released and beta 5 is on the way.

My work on ifchk has allowed me to examine programmatically several areas of operating system functionality. Examples include the Linux netlink(7) and rtnetlink(7) facilities, device control--that is, network interfaces--via ioctl(2), signals and proc, the process filesystem. Proc and its ability to display a wide array of data concerning the runtime state of a system are the focus of our discussion here.
Fedora+Core

The Perfect Desktop - Part 1: Fedora Core 6

Post date: February 22, 2007, 19:02 Category: Desktop Views: 7558 Comments
Tutorial quote: With the release of Microsoft's new Windows operating system (Vista), more and more people are looking for alternatives to Windows for various reasons. This tutorial is the first of a series of articles where I will show people who are willing to switch to Linux how they can set up a Linux desktop (Fedora Core 6 in this article) that fully replaces their Windows desktop, i.e. that has all software that people need to do the things they do on their Windows desktops. The advantages are clear: you get a secure system without DRM restrictions, and the best thing is: all software comes free of charge.
Debian

Setting Up A Highly Available NFS Server

Post date: April 1, 2006, 05:04 Category: Network Views: 6892 Comments
Tutorial quote: In this tutorial I will describe how to set up a highly available NFS server that can be used as storage solution for other high-availability services like, for example, a cluster of web servers that are being loadbalanced. If you have a web server cluster with two or more nodes that serve the same web site(s), than these nodes must access the same pool of data so that every node serves the same data, no matter if the loadbalancer directs the user to node 1 or node n. This can be achieved with an NFS share on an NFS server that all web server nodes (the NFS clients) can access.

As we do not want the NFS server to become another "Single Point of Failure", we have to make it highly available. In fact, in this tutorial I will create two NFS servers that mirror their data to each other in realtime using DRBD and that monitor each other using heartbeat, and if one NFS server fails, the other takes over silently. To the outside (e.g. the web server nodes) these two NFS servers will appear as a single NFS server.

In this setup I will use Debian Sarge (3.1) for the two NFS servers as well as for the NFS client (which represents a node of the web server cluster).
Linux

Configure Multiple Network Profiles on Linux

Post date: April 13, 2005, 02:04 Category: Network Views: 3157 Comments
Tutorial quote: Mobile Linux users face some interesting (OK, vexing) challenges when they want to plug into different networks. Any Linux system will easily support all manner of networking profiles--dialup, ISDN, Ethernet, wireless--the tricky bit is configuration. Manually re-configuring a PC for every connection is low on most users' lists of "fun things to do." You can be an ace scripting guru and fiddle up something yourself, or you can find a nice ready-made utility to do the work for you. Unfortunately, I have not found a universal utility to do this. However, there are a lot of utilities specific to various distributions, and an assortment of other utilities.
Debian

Majordomo Configuration

Post date: April 10, 2006, 18:04 Category: Network Views: 2867 Comments
Tutorial quote: Majordomo is a program which automates the management of Internet mailing lists. Commands are sent to Majordomo via electronic mail to handle all aspects of list maintenance. Once a list is set up, virtually all operations can be performed remotely by email, requiring no intervention upon the postmaster of the list site.
Linux

Block Spammers/Hackers With mod_defensible On Apache2

Post date: December 5, 2008, 12:12 Category: Security Views: 3625 Comments
Tutorial quote: mod_defensible is an Apache 2.x module intended to block spammers using DNSBL servers.

It will look at the client IP and check it in one or several DNSBL servers and return
a 403 Forbidden page to the client.
Linux

Performance Tools for Optimizing Linux: Process-Specific CPU

Post date: June 1, 2005, 07:06 Category: Optimizing Views: 3816 Comments
Tutorial quote: The tools to analyze the performance of applications are varied and have existed in one form or another since the early days of UNIX. It is critical to understand how an application is interacting with the operating system, CPU, and memory system to understand its performance. This chapter will help you understand where the bottleneck in your system is occuring, and how to fix it.
OpenSUSE

ntop in openSUSE to probe & monitor Network Traffic

Post date: April 10, 2009, 07:04 Category: Network Views: 6867 Comments
Tutorial quote: ntop is a free opensource network traffic probe that shows the network usage. ntop is based on libpcap and can run on Linux/Unix and Windows operating system. ntop provides a very easy to use a web access to navigate through ntop traffic information and get a dump of the network status.
Fedora

High-Availability Storage With GlusterFS On Fedora 12

Post date: March 2, 2010, 12:03 Category: Installing Views: 3367 Comments
Tutorial quote: This tutorial shows how to set up a high-availability storage with two storage servers (Fedora 12) that use GlusterFS. Each storage server will be a mirror of the other storage server, and files will be replicated automatically across both storage servers. The client system (Fedora 12 as well) will be able to access the storage as if it was a local filesystem. GlusterFS is a clustered file-system capable of scaling to several peta-bytes. It aggregates various storage bricks over Infiniband RDMA or TCP/IP interconnect into one large parallel network file system. Storage bricks can be made of any commodity hardware such as x86_64 servers with SATA-II RAID and Infiniband HBA.
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