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nixCraft Linux / UNIX Newsletter |
| How to remove all old and outdated brew packages on MacOS Posted: 07 Nov 2016 12:01 PM PST I am using Homebrew to install packages on MacOS Sierra or Mac OS X. I noticed multiple version of bash or curl installed in /usr/local/Cellar/bash/. How can I delete an outdated version of brew packages and only keep the latest version on my system? |
| How to speed up OpenSSL/GnuPG Entropy For Random Number Generation On Linux Posted: 07 Nov 2016 10:21 AM PST Entropy is nothing but the measure of "randomness" in a sequence of bits. The PRNG ( pseudorandom number generator ) is a special device (e.g. /dev/random on Linux) to create randomness from server hardware activities. It uses interrupts generated from the keyboard, hard disk, mouse, network and other sources. The random number generator gathers environmental noise from device drivers and other sources into an entropy pool. The randomness usually used for security purposes like creating TLS/SSL keys and the quality source of random bits is critical. For example, OpenSSL APIs can use quality randomness to make your program cryptographically secure. However, a poor source of randomness could result in loss of security. In this post, I will cover haveged and rng-utils/rng-tools to generate random numbers and feed linux random device for your virtual or dedicated Linux server. |
| How to install LXD container hypervisor on Ubuntu 16.04 LTS server Posted: 07 Nov 2016 06:31 AM PST How do I install LXD container "hypervisor" to runs unmodified Debian/Ubuntu/CentOS Linux operating systems VM at incredible speed on a Ubuntu Linux 16.04 LTS server? |
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