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Articles by Raunak Jain
Page 4 of 8
Top skills that would be handy before taking up a technical role
Getting through all the tedious interview rounds of big tech giants for internships and jobs is in itself a big task. But once you clear the interview rounds and secure a job or an internship, the journey does not end there. In fact, this will be the time you need to upskill yourself in order to keep up with the pace of shift in technological stacks that the tech industry goes through. In this article, we will be discussing top skills that would be very handy if you would learn it before taking up the job or internship position. ...
Read MoreHow to list containers in Docker?
Managing multiple Docker containers in a single host machine through a single command line can become tough. Hence, it’s better to know the Docker commands to manage containers the best possible way. Docker provides us with many command line tools and utilities to manage containers. In this article, we will discuss how to list Docker containers through multiple ways. We will also look at how to filter the list output to get the desired results. Listing Docker Containers Predominantly, there are two major commands that you can use to display a list of all containers − ...
Read MoreHow to list images in Docker?
Docker provides comprehensive commands to manage Docker objects including images, containers, volumes, and networks. When working with Docker extensively, you may accumulate numerous images on your system. Listing and managing these images efficiently becomes crucial for system organization and resource management. This article explores various methods to list Docker images using different commands and options to filter, format, and display image information according to your specific requirements. Basic Docker Image Listing Commands Docker provides two primary commands for listing images, both yielding identical results: docker image ls [OPTIONS] [REPOSITORY[:TAG]] docker images [OPTIONS] ...
Read MoreHow to remove old Docker containers?
Docker allows you to remove old and stale containers that are no longer needed. You can use the docker rm or docker container rm commands to accomplish this. However, before removing containers, ensure that none are actively running, as Docker will throw an error for running containers. There is a workaround for this − you can remove Docker containers forcefully using the --force option. The Docker remove commands allow you to remove one or more containers together by specifying their container IDs or names. If you want to delete all Docker containers simultaneously, you can achieve this using sub-commands. ...
Read MoreVagrant vs Docker for creating an isolated environment
Vagrant is a software tool that allows you to create and manage virtual machines that replicate specific environments exactly as needed. Vagrant enables you to test applications in controlled environments by mirroring the operating system and all appropriate configurations through complete virtualization. Docker is a containerization platform that lets you package applications into lightweight containers, creating isolated microenvironments for deployment without running a full virtual machine. Each container provides a separate, isolated environment containing only the necessary application components. Both tools help developers, testers, and DevOps engineers reduce debugging time by ensuring consistent environments across development, testing, and ...
Read MoreWhat is the difference between CMD and ENTRYPOINT in a Dockerfile?
Docker containers are built using Dockerfiles which contain step-by-step instructions to define the container environment. Among the various Dockerfile instructions, CMD and ENTRYPOINT are two critical commands that define what processes run inside containers. While they appear similar, they have distinct behaviors and use cases. Before exploring their differences, it's important to understand the two forms of writing instructions in Dockerfiles: Shell Form vs Executable Form Shell Form In shell form, the command is processed by a shell (/bin/sh -c). This allows shell features like variable expansion and command substitution. INSTRUCTION command param1 param2 ...
Read MoreWhat is the difference between the 'COPY' and 'ADD' commands in a Dockerfile?
When you create a Dockerfile, you can use two different commands to build your context. Building a context means including the files and directories that you want from your local machine, to be in your container when it's created. These files may be directories in your local machine, a URL from which you want to download files, or a compressed tarball file that you want to include as it is or after extracting the tarball file. We can use two different instructions to add the files from the build context in the local machine to the Docker container. These ...
Read MoreTop tips to manage docker containers from command line
Docker has become the standard for containerization, with organizations rapidly adopting container-based architectures. Managing multiple containers and images through the command line interface (CLI) can seem overwhelming, but with the right set of commands and techniques, it becomes straightforward and efficient. This article covers essential tips and commands for managing Docker containers and images from the command line, helping you streamline your container operations and save valuable time. Listing Images and Containers Keeping track of your Docker resources is crucial for effective management. Use these commands to view your current images and containers. List All Images ...
Read MoreBest practices for writing a Dockerfile
A Dockerfile is a text document containing instructions to build a container image. It allows developers to create reproducible execution environments and automate the deployment process. Writing an efficient Dockerfile is crucial for project performance, especially when deploying at scale. Docker images follow a layered architecture where each instruction creates a new layer. This design enables image reuse, efficient disk storage utilization, and caching during the build process. Understanding this layered structure is key to optimizing your Dockerfile. Docker Image Layer Structure Application Layer ...
Read MoreUsing .Dockerignore file
We know that we can run our docker images on cloud services which provide high computations at low cost. However, one might wonder why we need to optimize a docker image. Think of a situation where you have copied a large file in your docker container that you actually don't need. It will obviously increase the size of the docker image, increase the overall build time, and cause caching issues. So, why not use a simple technique to avoid all these issues and improve the overall performance of the docker build process. What is a .dockerignore file? Similar ...
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