Tag Archives: SysAdmin

Installing & configuring Cacti for 1 Minute 64bit Graphing

Posted on August 13, 2014 by richard

The “Interface – Traffic (bit/sec…)” Cacti Graph Templates need to be edited to set this “Upper Limit” value (confirmed that ‘0’ works fine here) and save that change, for each of the bit/sec Traffic Graph Templates you use (“Interface – … Continue reading →

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Helping customers wrt DNS Amplification DDOS Attacks

Posted on January 18, 2014 by richard

There’s been a new wave of these Name Server exploits to cause global “DNS Amplification” DDOS Attacks and some customers are asking for information and help in stopping their Name Servers being utilised for this undesirable network activity. We’re available … Continue reading →

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We can supply and assist with MariaDB Galera MySQL Clusters

Posted on June 17, 2013 by richard

We’ve done a lot of work on and with Clustered MySQL Database Servers recently, focussing on the latest MariaDB Galera open-source ‘Master-Master’ multi-node MySQL DB server software, in various modes, with various number and location of nodes (across the continent … Continue reading →

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Spacewalk at Network Presence

Posted on May 25, 2013 by richard

We’ve installed and made available to Network Presence customers (by default) and the Internet (by contact) a Spacewalk Server for CentOS 5 & 6, Fedora 18 and Debian 6 & 7 local software Repositories, in both 32-bit and 64-bit architectures. … Continue reading →

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Some Shell Shortcuts

Posted on May 24, 2013 by richard

The following describes some common and useful “Shell” (/bin/sh) or “Bash” (/bin/bash) Unix and Linux command-line ‘shell’ key based shortcuts for commands or actions: a) CTRL-a brings the cursor to the start of the current line and CTRL-e puts it … Continue reading →

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Need to remove those pesky ^M chars at the end of lines in text files…

Posted on April 16, 2013 by richard

Need to remove those pesky ^M chars at the end of lines in text files in *nix? Try “col -bx” or “tr ‘r’ ‘n’” See man pages. #NetPres

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Available for Consulting & Contracting on Internet, Linux & Open-Source in Australia/NZ

Posted on April 8, 2013 by richard

I’m now available at short-notice for brief work contracts in Adelaide (primarily), but also anywhere in Australia or New Zealand (as well as Asia, Europe and the US as relevant). My preference and major availability for is brief or short … Continue reading →

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Installing Oracle XE Database on CentOS

Posted on April 6, 2013 by richard

Once you satisfy the login requirements for Oracle’s site, you can download their “Express” Database, which from their License Agreement for that DB sofware, can only be run/used in the following manner: Any use of the Oracle Database Express Edition … Continue reading →

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How to close open BIND-based DNS servers

Posted on March 28, 2013 by richard

With DNS Amplifiers being used more and more in DOS type network attacks, we’ve been in contact with customers who have ‘open’ DNS resolvers and servers within Network Presence, but a quick and simple way to “lock down” your BIND … Continue reading →

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Installing mod_spdy in Apache on CentOS/RHEL/Fedora/Debian/Ubuntu Linux

Posted on January 2, 2013 by richard

A note that we’ll be deploying SPDY on our listed OS templates for Apache. Here’s some notes from the Google Dev’s on SPDY installs and we’ll update this post with how to install SPDY on Apache 2.2.4 (or higher) on … Continue reading →

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