HostNameLookups is where Apache does a reverse DNS lookup for every connecting client’s IP address. In addition to on and off there is also a double option that does a reverse lookup followed by a forward one to see if the host name matches the IP address.
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linux
Encrypt a File on Linux Using OpenSSL
It is possible to encrypt a file for secure transmission or backup using a strong cryptographic algorithm on Linux. We do that using OpenSSL:
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Preventing Multiple Instances of a Script From Running Using flock
Sometimes you want to limit a script to just one instance. Say the script accesses a resource that you don’t want to be shared. So how do you prevent multiple instances of a single script from running?
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Adding MD5Sum to KDE GUI Right-Click Menu
KDE is a great desktop environment and its killer feature has always been the great level of customization that you can perform. In this post I look at adding support for MD5, SHA256 and other file checksum operations to the right-click context menu. This will allow you to do an MD5sum or SHA256sum of ISO images or other files right from within the GUI.
How to Find Linux Distribution and Linux Kernel Information
Find out information about your Linux distribution, such as version, vendor and kernel version and architecture, using the Linux command line.