Author Archives: Randy

hostapd init script for Redhat/CentOS

Hostapd is a software daemon that turns a Linux box into a full blown wireless access point, but it doesn’t come with an init script to automatically start it when the machine boots up. It seems each Linux distribution that supports hostapd does their own thing, so I went ahead and created this little init […]

Migrating from Rackspace Cloud to Cpanel

Fed up with cloud hosting? You’re not alone. Just recently, I assisted a mass exodus of over 50 mysql/joomla based sites. After the migration to just a modest dedicated server with Cpanel, MySQL queries improved by 200% on average. Some longer queries and page loading times saw improvement of over 1000%. Additionally, the dedicated server […]

Easy Javascript-based Bookmark Link

Here’s a simple Javascript-based bookmarking script for your site. It automatically populates the page name and URL so you don’t have to. Put this in the <HEAD>: <script language=”javascript” type=”text/javascript”> function addToFav() { if(window.sidebar){ window.sidebar.addPanel(document.title, this.location,””); }else{ window.external.AddFavorite(this.location,document.title); } } </script> Then, you can add a link in your <BODY>: Bookmark Us!

Sysctl and ip_conntrack_max optimization

On a busy webserver, you have to be very careful that you don’t run out of connection tracking buckets. Check how many you have set as your max: /sbin/sysctl net.ipv4.ip_conntrack_max Check how many you’re using: wc -l /proc/net/ip_conntrack A good maximum setting for most web servers with at least 2Gb RAM is 65536. Change the […]

Bash: How to add a line on top of text files with sed

Sometimes you might need to add one or more lines of text to the top of an existing text file. Let ‘sed’ rescue you: sed -i ‘1iSTUFF TO ADD’ file.txt You can add multiple lines (separated by \n) to multiple files at once: sed -i ‘1iSTUFF TO ADD\nMORE STUFF’ *.txt

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Find files modified/created within N days ago

This proved to be useful in cleaning up a compromised site. List all the files created or modified within a certain time frame — in this case we are looking 30 days in the past: find . -mtime -30 -type f -print If you want to delete all files created/modified n days ago, you can […]