Tag Archives: Apache

LinuxCon 2010 Just for Fun Poll Results explained

The results of the “Just for Fun” Poll  linux.com community have just been released.  You may be wondering what some of those weird names actually mean, so here goes a short guide for those, like myself, who are not up to date with it all.


Best new Kernel Feature

  1. Btrfs: is a new copy on write filesystem for Linux aimed at implementing advanced features while focusing on fault tolerance, repair and easy administration. Initially developed by Oracle, Btrfs is licensed under the GPL and open for contribution from anyone.

    Linux has a wealth of filesystems to choose from, but we are facing a number of challenges with scaling to the large storage subsystems that are becoming common in today’s data centers. Filesystems need to scale in their ability to address and manage large storage, and also in their ability to detect, repair and tolerate errors in the data stored on disk. [extracted from https://btrfs.wiki.kernel.org/index.php/Main_Page ]

  2. Dynamic Tracing: Dynamic event tracing is one of the newest feature on perf/ftrace. This allows users to dynamically add/remove additional trace-events with various arguments in the kernel. This feature consists of kprobe-based event tracer and ‘perf-probe’ user-space command which helps users to find probe points easily from source code by analyzing kernel debuginfo.  Extracted from http://events.linuxfoundation.org/lfcs2010/tracing
  3. LogFS: is a Linux log-structured and scalable flash filesystem, intended for use on large devices of flash memory. It is written by Jörn Engel and in part sponsored by the CE Linux Forum. [extracted from http://en.wikipedia.org/wiki/LogFS ]
  4. Ceph Filesystem: Ceph is a distributed network file system designed to provide excellent performance, reliability, and scalability. [ extracted from http://ceph.newdream.net/about/ ]


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Linux ClearOS to rival Microsoft’s SBS

Microsoft has dominated the small enterprise market with its out of the box feature rich SBS (Small Business Server). Linux has always trailed behind it and although most of the technology to rival Microsoft has been in place, it has always been a mammoth task to setup a server from scratch  to do that.  ClearOS came to fill in this gap.

“ClearOS is a powerful network and gateway server designed for small organizations and distributed environments.  Though ClearOS comes with an extensive list of features  and integrated services, the solution is easy to configure thanks to the intuitive web-based interface.” (extracted from Clear Foundation website)
 
Take a look at how ClearOS’ features match the MS SBS:

Microsoft SBS

Centralized Authentication (Active Directory)
Mail, calendaring and instant messaging (Exchange)
Webserver (IIS)
Firewall (ISA)
Content management system (Sharepoint)
Antivirus (Forefront)
Database (MS-SQL Premium version only)
Remote Desktop Services
Virtual Private Network (VPN)

ClearOS Linux

Centralized Authentication (LDAP)
Primary Domain Controller (Samba)
File and Print Services (Samba and CUPS)
Mail (SMTP, POP, IMAP, Webmail)
Calendaring (Kolab groupware)
Webserver (Apache)
Firewall plus intrusion protection (iptables, Snort)
Antimalware (Clam Antivirus, Antiphishing, Antispyware)
Antispam (Spamassassin)
Database (MySQL)
Virtual Private Network (IPSec, OpenVPN, PPTP)
Web Proxy (Squid)

The Linux Magazine published an in depth article comparing and explaining this “new” Linux distro. 

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.htaccess 301 Redirect

.htaccess files (or “distributed configuration files”) provide a way to make configuration changes on a per-directory basis in an Apache HTTP Server. This file, containing one or more configuration directives, is placed in a particular document directory, and the directives apply to that directory, and all subdirectories thereof.

This 301  Redirect can be used anytime you want to redirect a URL. Here are some examples of its use:

  • Single page – Redirect 301 /old_page.html http://www.mysite.com/new_page.html
  • entire site –   Redirect 301 /  http://www.new_site.com/
  • change file extension (html to php in this case) –  RedirectMatch 301 (.*)\.html$ http://www.mysite.com$1.php

There are many other uses for Redirect 301 and mod_rewrite on Apache, if you are moving a site or redesigning a site with a new CMS make sure you redirect your old URLs to your new site. By failing to do so any user that clicks on a link to your old site (page) will hit a 404 ERROR page, this will affect your search rankings. 

The book “Professional SEO” has a good chapter in mod_rewrite and URL redirection, and is also great SEO manual

For a full tutorial on .htaccess visit the official Apache website.

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