Docker DevOps - DevOps Blog

Docker DevOps

A collection of 18 posts

How to Pass Environment Variables to Docker Containers?

How to Pass Environment Variables to Docker Containers?

Containerized applications can run seamlessly across a variety of environments, including development, testing, and production. As these applications move from one environment to another, they often require some configurations to be adjusted to meet each environment's unique needs. For example, in a development environment, enabling verbose debugging can provide developers

Docker-Compose Logs: How to View Log Output?

Docker-Compose Logs: How to View Log Output?

As you deploy containerized applications using Docker, you may occasionally encounter issues that prevent your applications from running as expected. This is where effective troubleshooting becomes essential, and logs serve as your best tool for this purpose. Logs are detailed records of the events that occur within an application. They

How to Use Docker CP Command With Examples?

How to Use Docker CP Command With Examples?

In Docker, the docker cp command is a powerful tool that provides a way to copy data in and out of a container. This makes it useful for performing tasks such as debugging and data backup. In this blog post, we'll explore how to use the docker cp command to

Why and How to Tag a Docker Image?

Docker Image Tag

Why and How to Tag a Docker Image?

Learning to properly tag Docker images in a production environment is crucial. Meaningful and consistent image tags not only help users easily identify and select the appropriate image versions for their needs but also enhances clarity and streamlines workflows within the team. In this blog post, we’ll learn why

Docker Entrypoint vs CMD: What Is the Difference and How to Choose?

Docker Entrypoint vs CMD: What Is the Difference and How to Choose?

Docker is a platform that lets us run and manage applications inside containers. Before we can run an application inside a container, we must create a Docker image of the application using Dockerfiles. A Dockerfile is a text file that contains instructions that are executed by Docker to create the

How to Remove Unused and Dangling Docker Images?

How to Remove Unused and Dangling Docker Images?

A Docker image is a static file that contains everything needed to run an application, including the application code, libraries, dependencies, and the runtime environment. In this blog post, we’ll learn how to remove unused and dangling Docker images. But first, let’s understand what they are. What Is

How to Create Docker Image From a Container?

How to Create Docker Image From a Container?

Docker is a platform that helps run applications inside containers. One of its powerful features is that you can create custom Docker images from containers. Now, you might be wondering, why bother creating an image from a container when you can just use Dockerfiles? Well, one important reason is when

How to Get Docker Container IP Address From the Host?

How to Get Docker Container IP Address From the Host?

In this blog post, we’ll explore various methods for finding the IP address of a Docker container that was started with the default container networking. When we say that a container was started with the default container networking, it means that the container is using the built-in Docker networking

What is 12-Factor App? Twelve Factor App Methodology Explained.

Twelve-Factor App

What is 12-Factor App? Twelve Factor App Methodology Explained.

In the past, standalone applications were the most common way to deliver software. These applications were installed and run on the user's local computer, without requiring external resources. However, over the years, there has been a significant increase in the use of web technologies, leading to the delivery of software

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

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,

Role of Docker in DevOps

What Is Docker in DevOps & How Does It Work?

One of the core technologies that has transformed application development is Containerization. It involves packaging software applications and all their dependencies into a single, self-contained unit known as a container. This makes managing, testing, deploying, and scaling an application easier. The most commonly used containerization tool is Docker. This article

Docker Networking

A Quick Guide to Docker Network Types

Docker is a platform that allows developers to package and deploy applications in containers, which can run on any system without requiring additional dependencies or configuration. Docker's portability, efficiency, and ease of use have made it a popular choice for organizations. Another feature that makes it a favorite for DevOps

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 three 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