Docker DevOps - DevOps Blog

Docker DevOps

A collection of 24 posts

How Dockerfile Works

How Dockerfile Works

A Dockerfile is a text file that contains instructions on how to build a Docker image

Where Docker Images are Stored

Where Docker Images are Stored

One question that often arises for both newcomers and seasoned Docker users alike is: "Where are Docker images stored?" Understanding the storage location of Docker images is crucial for managing disk space and optimizing Docker performance. Whether you're running Docker on macOS, Windows, or Linux, this

Docker Compose Command Not Found: 3 Possible Causes & Fixes

Docker Compose Command Not Found: 3 Possible Causes & Fixes

While using Docker Compose, one error that you might encounter is: "Docker Compose Not Found". This error might seem daunting at first glance; however, it usually points to a few common issues that are relatively straightforward to resolve. In this blog post, we'll explore three common

How to Fix Docker Build Requires Exactly 1 Argument

How to Fix Docker Build Requires Exactly 1 Argument

In this blog post, we'll discuss what causes the docker build requires exactly 1 argument” error and how to resolve it.

How to Keep Docker Container Running

How to Keep Docker Container Running

Docker containers are generally designed to run a specific task or process and will remain active for the duration of that process. When the process finishes, the container exits. However, there are scenarios where you might want to keep the Docker container running indefinitely. This could be for debugging, development,

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

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

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 enhance clarity and streamline 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 containing instructions that Docker executes to create the image. Each instruction

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? One important reason is when you

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

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

The Docker network is isolated from the host system's network, allowing containers to communicate securely with each other without interfering with other applications on the host. Docker also provides a set of commands and APIs for managing network connections and configuring network settings for individual containers. This blog

Best DevOps Tools

5 DevOps Tools Every Beginner Should Know in 2023

DevOps is a rapidly growing field combining software development and IT operations to improve software delivery speed and quality. If you want a career in DevOps, you’ll need to learn to use tools like Jenkins, Docker, Kubernetes, Ansible, and Git. In this article, we’ll look at five popular

Docker Certified Associate : Docker Engine Storage & Volumes

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

In the previous blog of this 7-part series, we discussed Docker Engine Security. This last blog dives into how storage is implemented in Docker and the components involved. When you install Docker on a host, it automatically creates a directory: /var/lib/docker. This becomes the default file path for

Docker Certified Associate : Docker Engine Security

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

In the previous blog of this 7-part series, we discussed Networking. This blog dives into Docker engine security. Security within the IT landscape is as critical as maintaining a strong armed force for a country. To secure the underlying operations and business functions while working with Docker, you must secure

Docker Certified Associate : Networking

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

In the previous blog of this 7-part series, we discussed Installation and Configuration. This blog dives into Networking. Here are the six other blogs in the series: * Docker Certified Associate Exam Series (Part-1): Container Orchestration * Docker Certified Associate Exam Series (Part-2): Kubernetes * Docker Certified Associate Exam Series (Part-3): Image Creation,

Docker Certified Associate : Installation and Configuration

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

In the previous piece of the 7-article series, we covered Image Creation, Management, and Registry. This piece introduces the Docker Engine, including its architecture, installation, and configuration. We will also go through basic container operations and explore various ways of configuring and troubleshooting the Docker Daemon. Here are the five

Docker Certified Associate : Image Creation, Management and Registry

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

In the part 2 of the 7-article series, we covered Kubernetes. This piece tackles the operations involved in creating, running, and managing images in Docker. Here are the five other parts: * Docker Certified Associate Exam Series (Part-1): Container Orchestration * Docker Certified Associate Exam Series (Part-4): Installation and Configuration * Docker Certified