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Detecting and Solving Segmentation Faults in Linux Containers

Understanding and solving errors are essential skills for any Linux administrator. The most common errors you will get are: “no such file or directory found” or “unable to access or permission denied”. If you are a Linux administrator, it is mandatory to know how to detect and solve segmentation faults. In this article, we will explain what segmentation fault is, what causes them, and how to detect or troubleshoot them. So let’s get started.

What Is a Segmentation Fault?

A segmentation fault is nothing but the error that occurs due to failed attempts to access Linux OS’s memory regions. These types of faults are detected by the kernel. Once detected, the process is immediately terminated, and a “segmentation violation signal” or “segmentation fault” is issued. 

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How to Install and Configure an LXC Container on Ubuntu 16.04

Introduction

Per Wikipedia, "LXC also known as a Linux Containers is a free, open source, lightweight and operating system-level virtualization software that allows us to run a multiple isolated Linux systems on a single Linux host. LXC provides the cgroups functionality that allows the limitation of resources like, CPU, memory, network without the need for starting any virtual machines. You can start Linux container without using the separate kernel using LXC. LXC allows your to run multiple instances of an operating system or application on a single host, without inducing overhead on CPU and memory. Containers can be used to quickly set up a virtual environment for testing/QA purposes."

In this tutorial, we will explain how to setup LXC container on Alibaba Cloud Elastic Compute Service (ECS) instance with Ubuntu 16.04.

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How to Set Up Django With Postgres, Nginx, and Gunicorn on Ubuntu 16.04

Introduction

Django is a free, open source, and high-level Python web framework that encourages rapid development and clean, pragmatic design. Django's MVC (Model-View-Controller) architecture is maintained by the Django Software Foundation. Django is a strong web framework that can assist you to get your application online as quickly as possible. The primary goal of Django is to ease the creation of complex, database-driven websites. Django supports four major database backends including, PostgreSQL, MySQL, SQLite, and Oracle.

You can run Django in conjunction with Apache, Nginx using WSGI, Gunicorn, or Cherokee using a Python module.

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How to Install Monit Monitoring Tool on Ubuntu 16.04

Introduction

Monit is a free and open source tool for managing and monitoring processes, programs, files, directories and filesystems on a Unix system. Monit also monitors different services like Apache, Nginx, MySQL, FTP, SSH, Sendmail and many more. It allows system administrators to get notified and fix problems as soon as possible with minimal interruption. Monit comes with a user-friendly web interface where you can easily view the system status. You can also monitor remote hosts TCP/IP port, server protocols and ping using Monit. If any services go down, it conducts automatic maintenance and repair and can execute meaningful causal actions in error situations. Monit also keeps its own log file and alerts about any critical error conditions and recovery status via customizable messages.

Features:

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How to Setup Docker Private Registry on Ubuntu 16.04

Introduction

Docker Private Registry is a highly scalable server-side application that can be used to store and distribute the Docker images internally within your organization. Docker also has its own public registry (Docker Hub) that allows you to store Docker images. But, the images you upload on Docker Hub becomes public. Anyone can access and use your images from Docker Hub. So it is not the best option for your organization. Docker Private Registry allows you to set up a Docker registry for your project privately so that only your organization can store and use Docker images on it. Using Docker Private Registry, you can easily control your images, fully own your images distribution pipeline, and integrate image storage and distribution tightly into your in-house development workflow. If you want to quickly deploy a new image over a large cluster of machines, then Docker Private Registry is the best solution for you.

In this tutorial, We will explain how to set up our own Docker Private Registry server on Alibaba Cloud Elastic Compute Service (ECS) instance with Ubuntu 16.04.