Docker - DevOps Blog

Docker

A collection of 27 posts

Docker Exec: How to Enter Into a Docker Container's Shell?

Docker Exec: How to Enter Into a Docker Container's Shell?

Docker is a platform that helps run applications inside containers. Once you have your application running in a container, you might want to carry out some tasks that require you to get inside the container. For example, you might want to modify files or directories, install new packages, or perhaps

DevOps vs Agile - What’s the Difference?

DevOps vs Agile - What’s the Difference?

If you are in the tech industry, you have probably heard the terms "DevOps" and "Agile" thrown around a lot. But what do they actually mean, and how are they different? Don't worry, that's what we are here to explore today. In this post, we will start by discussing what

Docker Architecture Explained: Docker Daemon, Docker Client & Docker Registry

Docker Architecture Explained: Docker Client, Docker Daemon & Docker Registry

Docker is a platform that helps you run your application in a container. A container is sort of like a virtual machine, but much more lightweight and easier to set up. The idea is that you package up your application and all of its dependencies into a container, and then,

Complete Docker + Wasm Tutorial: From C++ Code to Wasm Container

Complete Docker + Wasm Tutorial: From C++ Code to Wasm Container

In our previous lesson, we talked about the Docker + Wasm integration. Theory is always helpful, but nothing beats experience! So let's demystify some concepts, by actually seeing all of this in action. What will we see? Well, pretty much everything. To learn more about Wasm, check out our video What

WebAssembly and Docker + Wasm

What Is WebAssembly and Docker + Wasm? An in-depth look.

On October 24th, 2022, we received some pretty big news: Docker got official support for running WebAssembly applications. But if you're unfamiliar with WebAssembly (also called Wasm), this might leave you confused. Why is this big news? What is Wasm? Why is it so important for Docker? Want the short

Best Kubernetes Courses

10 Best Kubernetes Courses to Start Learning Online in 2023

Introduction Kubernetes is one of the most popular tools in today's world. Many companies use it for running their apps. Do you want to learn about it? Then you are at the right place. The blog provides you with a list of the best Kubernetes courses you can find online.

The Ultimate Docker Certification (DCA) Guide for 2023

Docker certification

The Ultimate Docker Certification (DCA) Guide for 2023

Why Get a Docker Certification? With a rising pattern of organizations adopting Cloud services, Docker continues to gain popularity. At its core, Docker aids in containerization, that is, for the packaging of applications into modules that can easily be replicated and scaled independently. Unarguably, as more applications are moving to

Difference between Docker, LXC, and LXD Containers

What Is the Difference between Docker, LXC, and LXD Containers?

Imagine you're a developer, writing a cool app for Linux servers. But some people run Ubuntu 20.04 on their servers. Others run 22.04. Others run an entirely different operating system such as Red Hat Enterprise Linux. So how do you make sure your app runs well on each

Kubernetes Dropping Docker

Docker and Kubernetes

Kubernetes Dropping Docker: What Happens Now?

A while ago, Kubernetes announced that it was deprecating Docker. Actually, it was deprecating something called dockershim, and Docker alongside it. Roughly one year after the announcement, Docker was completely removed from Kubernetes. Now, Kubernetes is a container orchestrator. Its job is to pull in container images, start them, stop

Docker vs. Containerd

Docker vs. Containerd: A Quick Comparison (2023)

A while ago Kubernetes announced that it was deprecating Docker. "Deprecated" is basically a tech word for "This will soon expire."; "Don't use this anymore, it will soon be removed." So how will Kubernetes run containers without Docker? With containerd, of course! Yes, Docker was replaced with something else, called

Top Skills Required in DevOps

DevOps Essential Skills

Top Skills Required in DevOps

In rich countries, the average salary of a skilled DevOps engineer is well over $100.000/year. Why are companies willing to pay so much? Well, first of all, these employees bring a lot of value to these companies. They help them deliver higher quality software, faster, and sometimes even

Container Runtime Interfaces In K8s

Container Runtime Interfaces In K8s

Introduction In this article, we will be discussing what a container runtime interface (CRI) is, why is it important and what functionality it adds to Kubernetes. What are Container Runtimes? You may have read about and heard the terms describing Kubernetes as a “container orchestration tool” that is actually right

Monitor using Grafana-Prometheus Stack

Monitor the infrastructure using the Grafana-Prometheus stack

Once the applications have been deployed in the production environment, it is very crucial to manage and maintain these applications. Proper management of these applications assure that they are running as expected and helps in the prevention of any application downtime. Along with the applications, it is also crucial to

Role of Docker in DevOps

Role of Docker in DevOps

A developer builds an application and sends it to the tester. But, the environments of development and testing systems are different; thus, the code does not work. There are two solutions to this: Docker and Virtual Machines, but Docker is far better in terms of performance, scaling, and efficiency. In

Overview of Docker

30,000 Feet Overview of Docker

If there’s one word that you hear no matter which developer circle you’re running with, it’s Docker. In a short time, Docker has managed to win over developers all over, thanks to its ability to smooth over most compatibility issues. So what exactly is Docker, and why

Best DevOps Tools

5 Best DevOps Tools Every Beginner Should Know in 2023

DevOps has evolved as one of the most popular software development approaches in recent years. Every software professional has a strong desire to become a DevOps expert. When it comes to DevOps, companies are necessarily asking the candidates if they know certain tools like Jenkins, Docker, Kubernetes, etc. Having the

Docker Certified Associate : Docker Engine Storage & Volumes

Docker Certified Associate Exam Series (Part-7): Docker Engine Storage & Volumes

Docker Storage Basics File System When you install Docker on a host, it automatically creates a directory: /var/lib/docker. This becomes the default file path for the storage of Docker files and objects. The directory has subfolders such as aufs, containers, images, volumes, and more. Files related to images

Docker Certified Associate : Docker Engine Security

Docker Certified Associate Exam Series (Part-6): Docker Engine Security

Docker Daemon Security Security within the IT landscape is as critical as maintaining a strong armed-force for a country. To ensure that the IT landscape of an organization is secured from external threats, organizations lay heightened emphasis to avoid security attacks that can potentially bring down business operations within days.

Docker Certified Associate : Networking

Docker Certified Associate Exam Series (Part-5): Networking

Introduction to Docker Networking Default Networks When you install Docker on a host machine, it automatically creates 3 types of networks: none, bridge, and host networks. * The Bridge network is the default network that Docker attaches to containers once they are created. This is a private internal network, whose IP

Docker Certified Associate : Installation and Configuration

Docker Certified Associate Exam Series (Part-4): Installation and Configuration

Introduction to the Docker Engine In this section, we introduce the Docker Engine, including its architecture, installation, and configuration. We will then go through basic container operations, then finally explore various ways of configuring and troubleshooting the Docker Daemon. Docker Engine Architecture Docker was first released for public use in

Docker Certified Associate : Image Creation, Management and Registry

Docker Certified Associate Exam Series (Part-3): Image Creation, Management and Registry

We use images in Docker to package, share and transport applications and preconfigured server environments. An image is, in essence, a template that contains the set of instructions we use to create and run containers on the Docker platform. This section tackles the operations involved in creating, running, and managing

Docker Certified Associate : Kubernetes

Docker Certified Associate Exam Series (Part-2): Kubernetes

Introduction to Kubernetes Kubernetes is the most popular container orchestration tool that integrates seamlessly with Docker. The DCA certification test emphasizes specifically on services, architecture, and commands used in Kubernetes, so it is crucial to develop a firm grasp of the framework. The Kubernetes section of the DCA exam preparation

Docker Certified Associate Exam Series: Container Orchestration

Docker Certified Associate Exam Series (Part-1): Container Orchestration

Introduction to Container Orchestration An essential part of preparing for the Docker Certified Associate (DCA) exam is to familiarize yourself with Container Orchestration. Container Orchestration requires a set of tools and scripts that you can use to host, configure, and manage containers in a production environment. Deploying in Docker typically