How to Locate Open Ports in Linux

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openports

What is a Port? 

First, let’s define what a port is. According to the IEFT, a port is: 

A logical entity for Internet communication. Ports serve two main purposes:
1. They provide a demultiplexing identifier to separate transport sessions between the same pair of endpoints
2. They may also identify the application protocol and associated service to which processes connect.

Wikipedia.com

In plain English, this simply means that a port is an endpoint through which data flows back and forth between two computers over a network. A computer has 65535 ports available to share information. These port numbers are based on a 16-bit number, which is where we derive the total number of available ports (0 to 65535).

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Using Telepresence to Improve Microservice Development

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What is Telepresence?

Initially developed by Datawire, Telepresence is a new open-source tool supported by the CNCF (Cloud Native Computing Foundation). It allows developers to run local software while connected to a remote Kubernetes cluster. The application uses a two-way network proxy to simulate TCP connections, environmental variables, and other volumes of services as local processes. This link allows for remote work to be accomplished while seemingly local to the cluster via the proxied connection. 

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BlueScale Digital: A Customer FAQ

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Today, Liquid Web proudly announced an acquisition of multiple client assets from BlueScale Digital, and we could not be happier to welcome them to the Liquid Web family! For more than 20 years, Liquid Web has been a leader in serving web professionals with highly performant services and exceptional support. This purchase includes multiple VPS, Dedicated, and Colocation clients from the following brands:

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How to Monitor Your Server in WHM

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In this article we will briefly cover the basics of monitoring your server via WHM. By following this process you will learn how to find: service status, resource usage, and Apache stats.

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What is Systemctl? An In-Depth Overview

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systemctl.073020

What is Systemctl? 

The systemctl command is a utility which is responsible for examining and controlling the systemd system and service manager. It is a collection of system management libraries, utilities and daemons which function as a successor to the System V init daemon. The new systemctl commands have proven quite useful in managing a servers services. It provides detailed information about specific systemd services, and others that have server-wide utilization.

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Managed Server vs. Unmanaged Server Defined

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In this article, we will be discussing what it means to employ a “Managed Server” versus an “Unmanaged Server” and what the primary differences are. This article is written in response to ongoing questions we have received from clients regarding the types of resources, services, and capabilities that are included when a managed server is selected for use.

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How to Check Server Load on a Windows Server

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What Does Server Load Mean?

Checking a server’s load allows us to evaluate server resources and confirm they are sufficient for any running application. It enables us to troubleshoot slow performance and reliably pinpoint any server resource that may need attention. While there are many tools and options available, today let’s focus on our Windows VPS Task Manager to help us quickly see what is going on, and interact with applications, processes, and services to identify the load. This article will also include an introduction to Resource Monitor as it can be opened from Task Manager to provide more detail. Continue reading “How to Check Server Load on a Windows Server”

Troubleshooting Cron Jobs

Reading Time: 4 minutesCron is a service for Linux servers that automatically executes scheduled commands. A cron job can be a series of shell commands, scripts, or other programs. Cron tasks or jobs can perform a variety of functions and once ran can send out an e-mail message to inform you of its completion or errors. If you receive an error, there are many ways to troubleshoot the cron task.  Use this article for troubleshooting assistance or a tutorial on the basics of cron jobs. If you would like to learn more about creating a cron job check out our Knowledge Base tutorials on the subject. Continue reading “Troubleshooting Cron Jobs”

An Introduction to Managing a Linux Server with systemd

Reading Time: 2 minutesSystemd is an init system used by several common Linux Distributions which has gained popularity since 2015. A Linux init system is the first process or daemon started on a system after the initial boot process, and manages services, daemons, and other system processes. Systemd is composed of unit files that contain the initialization instructions for the daemons which it controls. While many portions of a system can be managed with systemd, this article will focus on managing services. Continue reading “An Introduction to Managing a Linux Server with systemd”

Linux Runlevels Explained

Reading Time: 3 minutesA runlevel is one of the modes that a Unix-based, dedicated server or a VPS server OS will run on. Each runlevel has a certain number of services stopped or started, giving the user control over the behavior of the machine. Conventionally, seven runlevels exist, numbered from zero to six. Continue reading “Linux Runlevels Explained”