Category: Linux

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Dell OpenManage on CentOS 5.x

Dell OpenManage Server Administrator (OMSA) is a suite of tools provided by Dell for managing an individual server. Dell provides a Windows installation tool set on their support website but information pertaining to the installation on non-supported Dell operating systems (e.g. CentOS, Fedora) is a little hard to find.

If your running Dell branded servers with CentOS 5.x and need to install the current version of Dell OpenManage and OpenIPMI, the following script will automate the process.

1. Login to your server.
2. cd /usr/src Continue reading “Dell OpenManage on CentOS 5.x”

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Horde Webmail Security

For those using Plesk 9.x, Horde naively allows webmail logins via HTTP (in-secure) or HTTPS (secure). HTTP log-ins are not recommended as username and password information is sent in clear text across the Internet.

In the following example we’ll configure access to http://webmail.yourdomain.com to automatically re-direct to http://webmail.yourdomain.com.

NOTE: These instructions are specific to Plesk’s implementation of Horde but should work on any Horde 3.1.7 installation. Simply locate Horde’s “conf.php” file and adjust the parameters shown below.

[root@youserver /]# nano -w /etc/psa/webmail/horde/horde/conf.php Continue reading “Horde Webmail Security”

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APC PowerChute Agents on CentOS

This is a quick how to on installing APC PowerChute monitoring agents on CentOS. This has been tested on CentOS 5.x versions and will likely work on RedHat Enterprise as well.

APC provides a free “5 node” version of the PowerChute Business Edition Basic which includes the PowerChute server (used for real time monitoring), PowerChute Console (used for monitoring and managing agents/clients) and the PowerChute Agent (available for Windows, Linux etc. and used to monitor a specific machine). Whilst this version is limited to managing a maximum of 5 server agents at a time, for a small office or branch data centers, its more than adequate. The PowerChute console allows for monitoring and management of UPS units connected to production Windows and Linux servers via serial (RS-232). Status information including battery health, UPS and battery age, total run time available, city power conditions and remote shutdown are all available within the console.

The CentOS agents may be installed and configured as follows:

1. Install the PowerChute Server and Console on an existing Windows machine. Continue reading “APC PowerChute Agents on CentOS”

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MySQL CLI for Beginners

Introduction

I find that the majority of webmasters (and even some sysadmins!) who work with MySQL use phpMyAdmin as a web-based front-end management tool for MySQL. Whilst phpMyAdmin makes database management a breeze, for those interested in some ‘command line interface’ experience with MySQL, I’ve pieced together some beginner notes from various websites…

Creating a Database

In order to create a database you need to have the PRIVILEGES- this may be because you are the root user or you (or you systems administrator) has created an admin user that has ALL PRIVILEGES over all databases. In these examples a user called ‘admin’ has been created precisely for this purpose. Creating a database is fairly straightforward.

Logging In

A reminder of how to start the MySQL Client Software, and as we are not concerned with manipulating just one database we don’t have to specify a database as part of our startup command.

$ mysql -u <username> -p
Enter password: Continue reading “MySQL CLI for Beginners”

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WarVOX 1.0.1 – A Telephony Analysis & War Dialing Suite

WarVOX is a suite of tools for exploring, classifying, and auditing telephone systems. Unlike normal wardialing tools, WarVOX works with the audio from each call and does not use a modem directly. This allows WarVOX to find and classify a wide range of interesting lines, including modems, faxes, voice mail boxes, PBXs, loops, dial tones, IVRs, and forwarders. WarVOX provides the unique ability to classify all telephone lines in a given range, not just those connected to modems, allowing for a comprehensive audit of a telephone system.

WarVOX requires no telephony hardware and is massively scalable (and completely anonymous) by leveraging Internet-based VoIP providers. A single instance of WarVOX on a 1 mbit broadband connection, with a typical VoIP account, can scan over 1,000 numbers per hour. The speed of WarVOX is limited only by downstream bandwidth (64k per 711u channel) and the limitations of the VoIP service. Using four providers with over 80 concurrent lines we have been able to scan entire 10,000 number prefixes within 90 minutes! Continue reading “WarVOX 1.0.1 – A Telephony Analysis & War Dialing Suite”