Posts published in “Linux”

Cloud service providers often define host tiers by the allocated resources, but the differences in the underlying hardware, architecture and performance tuning can result in varying capabilities even between similar configurations. The easiest way to measure the real differences between servers is to run a set of tests, i.e. a benchmark, to create simple to read values for comparisons. UnixBench…

Ssmtp (Simple SMTP) is a little nice tool you can use under Linux command line to send out email. SSMTP allows users to transfer emails through an SMTP server from the Linux command line. It provides the means to connect to a mailhub with a proper configuration file. If your config file was set up right, all your worries regarding command…

1. What is Monit? Monit is a utility for managing and monitoring processes, programs, files, directories and file systems on a Unix like system. Monit conducts automatic maintenance and repair and can execute meaningful causal actions in error situations. E.g. Monit can start a process if it does not run, restart a process if it does not respond and stop…

One of my GCP VM is running at f1-Micro type which only has limited memory, 614MB. From syslog, I found it has a PHP invoked OOM killer messages. This usually means this server essentially ran out of memory and extra memory should add into this system, Based on some posts online, especially this 2010’s  post : “The Linux kernel likes to always allocate…

1. Update / Upgrade Commands sudo apt-get update : In a nutshell, apt-get update doesn’t actually install new versions of software. Instead, it updates the package lists for upgrades for packages that need upgrading, as well as new packages that have just come to the repositories. sudo apt-get upgrade : will fetch new versions of packages existing on the machine if APT…

Portainer is a lightweight management UI which allows you to easily manage your different Docker environments (Docker hosts or Swarm clusters). It is meant to be as simple to deploy as it is to use. It consists of a single container that can run on any Docker engine (can be deployed as Linux container or a Windows native container). Portainer…

Kali Linux is a Debian-based Linux distribution aimed at advanced Penetration Testing and Security Auditing. Kali contains several hundred tools which are geared towards various information security tasks, such as Penetration Testing, Security research, Computer Forensics and Reverse Engineering. Download Kali: https://www.kali.org/downloads/ Basic Configuration Videos:

The CentOS (Community Enterprise Operating System) Project is a community-driven free software effort focused on delivering a robust open source ecosystem. For users, CentOS offers a consistent manageable platform that suits a wide variety of deployments. For open source communities, CentOS offers a solid, predictable base to build upon, along with extensive resources to build, test, release, and maintain their code. CentOS uses the Red Hat…

1. Ubuntu16.04 Installation 1.1 VMware Workstation Virtual Machine Creation for not easy installation If you are using VMware workstation , by default, system will do easy installation for you, which means all settings will be automatically entered by VMware Workstation. You wont need to provide too much or any information during installation process. We are not going to use this…