Updated: Aug 13th 2018 List all installed kernel packages with: yum list kernel The kernel in-use will be underlined and cannot be removed: Now to remove unused kernels, install the yum-utils package and use the package-cleanup util: yum install yum-utils package-cleanup –oldkernels –count=2 To make this permanent, edit /etc/yum.conf and add the following line: installonly_limit=2 – – – – – […]
Linux: ncdu and mc to manage large directories
August 13, 2018 by Hayden James, in Blog LinuxCreating, modifying and deleting files are common tasks performed in any operating system. Even more so by Sysadmins, Developers and Programmers. For the most part, these tasks are fast enough when managing a handful of files. However, on Linux and especially with servers, you may at sometime have to manage millions or even billions of […]
Best Linux Server Distro by main focus/strength
August 8, 2018 by Hayden James, in Blog LinuxAre you trying to decide on a Linux server distro (distribution)? This article will help guide you based on the strengths of the Linux server distributions available. If you are looking for desktop advice, have a look at Choosing the Best Linux Distro for Desktop. Best Linux Server distro Again, the first rule to remember […]
Choosing the Best Linux Distro for Desktop 2018
August 8, 2018 by Hayden James, in Blog LinuxSearching for the best Linux distro (distribution)? This article will probably be most useful to those who don’t know what /etc/fstab is used for. Also, this post does not cover Linux server distributions, but instead focuses on Linux desktop distributions. One great way to increase your familiarity with Linux servers is to run Linux on your laptop and/or […]
Linux – How to Securely Copy Files Using SCP examples
August 8, 2018 by Hayden James, in Blog LinuxThis post includes SCP examples. SCP or secure copy allows secure transferring of files between a local host and a remote host or between two remote hosts. It uses the same authentication and security as the Secure Shell (SSH) protocol from which it is based. SCP is loved for it’s simplicity, security and pre-installed availability. SCP […]
100+ Server Monitoring & Application Performance Monitoring Solutions
August 2, 2018 by Hayden James, in Blog LinuxLast Updated: Aug 2nd 2018, 100+ December 1st 2017 update: 70 100 Top Server Monitoring & Application Monitoring Tools. August 6th 2017 update: 50 70 Top Server Monitoring & Application Monitoring Tools. Back in 2014, I compiled a list of the top 20 server performance monitoring solutions. Largely because I already had a list saved locally for my own reference. Sharing that list […]
81% of all Smartphones are powered by Linux
July 19, 2018 by Hayden James, in Blog LinuxUpdate July 19th 2018: Now 85% as per latest report. No, I didn’t use a misleading blog title. Smartphones powered by Linux are in fact dominating the smartphone market. A few of you may be scratching your heads at this point (stop that, you’ll go bald) while others are filled with that Sound of Music […]
Linux top: Here’s how to customize it
July 17, 2018 by Hayden James, in Blog LinuxThe top command – referred to below as Linux top – provides a dynamic real-time view of a running system. It can display system summary information as well as a list of processes or threads currently being managed by the Linux kernel. The types of system summary information shown by Linux top command and the order […]
Nginx tuning tips: TLS/SSL HTTPS – Improved TTFB/latency
June 30, 2018 by Hayden James, in Blog LinuxAs of 30th June 2018, the PCI Security Standards Council requires that support for SSL 3.0 and TLS 1.0 be disabled. TLS 1.1 or higher must be used and TLS 1.2 is strongly recommended. In addition, starting this July, Google Chrome will begin to mark HTTP web sites as “not secure”. Over the past few years, […]
Free Linux Server Monitoring and APM solutions for SysAdmins
June 25, 2018 by Hayden James, in Blog LinuxToday’s software applications require developers, testers, and SysAdmins to work together (DevOps) more seamlessly than ever before. A single line of code or poorly configured service can negatively impact your application’s performance, causing crippling slowdowns for end-users. This is where application performance monitoring (APM), comes in. APM is also referred to as application performance measurement or application performance management. […]