Found 45 Articles for Virtual Machines

Understanding Internet of Robotic Things

Updated on 28-Mar-2023 17:35:48
The Internet of Things (IoT) enables connecting smart devices to the network and these devices can communicate with each other without human intervention. This technology allows users to transmit huge amounts of data through wireless media. “Things” are smart devices and sensors that are added to everyday activities using a network connection. IoT devices are classified based on their usage in customer services, industrial needs, and commercial purposes. Networks of IoT can be categorized by the mobile network, Bluetooth connections, WAN, and Mesh protocols. IoT device chooses their network based on distance coverage, bandwidth, signal transmission, etc. In this article, ... Read More

Understanding Docker Architecture with examples

Aadyaa Srivastava
Updated on 27-Feb-2023 09:43:35
Describe Docker Docker is an open-source container management platform that is free to use and offers a wide range of tools and utilities for developing, testing, and deploying applications. You can build packed, isolated, and platform-independent containers that include all libraries and dependencies. This will make it simple for you to create and distribute applications. The Docker Platform The Docker platform provides tools and utilities for packaging, building, and running software applications in isolated and containerized environments known as containers. The Docker architecture's security and isolation enable you to do so. Docker includes numerous tools for managing container lifecycles. ... Read More

How to save all Docker images and copy to another machine?

Hemant Sharma
Updated on 17-Feb-2023 14:55:11
Introduction Docker images are the building blocks of containerized applications. They are lightweight, portable and can be easily shared between different machines. In this article, we'll take a look at how to save all Docker images on one machine and transfer them to another machine. Method 1: Using docker save and docker load One way to save and transfer Docker images is by using the docker save and docker load commands. The docker save command allows you to save one or more images to a tar archive, which can then be transferred to another machine. The docker load command allows ... Read More

How to flatten a Docker image?

Hemant Sharma
Updated on 17-Feb-2023 14:53:46
Introduction Flattening a Docker image is the process of creating a new, single-layer image from an existing multi-layer image. Flattening an image can be useful in a variety of scenarios, such as reducing the size of the image, improving the performance of the image, or simplifying the image for easier distribution. A flattened Docker image is an image that consists of a single layer, containing all the files and metadata required for the image to function. This is in contrast to a multi-layer image, which consists of multiple layers stacked on top of each other, each containing a subset of ... Read More

How to execute a script when I terminate a Docker container?

Hemant Sharma
Updated on 17-Feb-2023 14:52:30
Introduction Executing a script upon container termination is the process of running a script or command when a Docker container is stopped or removed. This can be useful in a variety of scenarios, such as cleaning up resources, logging information, or triggering other actions. Container termination refers to the process of stopping or removing a Docker container. This can be done manually using the docker stop or docker rm commands, or automatically through the use of container orchestration tools or container lifecycle management features. Example 1: ONBUILD To execute a script upon container termination using the ONBUILD Dockerfile command, follow ... Read More

How to cache the RUN npm install instruction when docker builds a Dockerfile?

Hemant Sharma
Updated on 17-Feb-2023 14:50:57
Introduction When building a Docker image, one of the most time-consuming and resource-intensive steps is running the "RUN npm install" instruction. This instruction installs all the dependencies listed in your package.json file. Caching the results of this instruction can greatly improve the build time of your image. In this article, we will explore different strategies for caching the "RUN npm install" instruction in a Dockerfile. Caching Strategies There are several strategies for caching the "RUN npm install" instruction in a Dockerfile. These include − Using a .dockerignore file − This strategy involves excluding the node_modules directory from being copied ... Read More

How many CPUs does a docker container use?

Hemant Sharma
Updated on 17-Feb-2023 14:49:08
Introduction Docker containers are a popular way to package and deploy applications. One of the key features of containerization is the ability to isolate resources and limit their usage. In terms of CPU, it is important to know how many CPUs a container can use, as this can greatly impact the performance of the application running inside the container. This article will cover the concepts of CPU resource allocation in Docker, determining the number of CPU available to a container, configuring CPU resources for a container, and advanced techniques for managing CPU resources. Understanding these concepts will help ensure that ... Read More

How can I use a variable inside a Dockerfile CMD?

Hemant Sharma
Updated on 17-Feb-2023 14:46:01
Introduction Using variables in a Dockerfile CMD can greatly improve the flexibility and maintainability of container configuration. Hardcoding values in a CMD instruction can make it difficult to update or modify the container's configuration in the future. Using variables allows for more dynamic and reusable configurations. Prerequisites The prerequisites for using variables inside a Dockerfile CMD depend on the method you choose to use − Using shell expansion − No specific prerequisites are required. Using the ENV instruction − No specific prerequisites are required. Using the ARG instruction − No specific prerequisites are required. Passing variable at runtime − ... Read More

Docker add network drive as volume on windows

Hemant Sharma
Updated on 17-Feb-2023 14:40:46
Introduction When working with Docker on Windows, it is possible to use network drives as volumes. This allows you to store data on a network drive and access it from within a Docker container. This can be useful in situations where you need to share data between containers, or between the host and the container. With network drive as volume, you can easily store, manage and backup your data in a centralized location and use it with multiple Docker containers. In this article, we will explore the process of adding network drives as volumes in Docker on Windows, and the ... Read More

What is the purpose of VOLUME in Dockerfile?

Hemant Sharma
Updated on 30-Jan-2023 10:08:22
Introduction Docker is a popular containerization platform that allows users to package and deploy applications in a standardized and isolated environment. Docker uses a file called a Dockerfile to specify the instructions for building and running a Docker container. One important element of a Dockerfile is the VOLUME instruction, which specifies a mount point for a volume in the container. In this article, we will explore the purpose and usage of volumes in a Dockerfile. Definition of volume in Dockerfile In the context of Docker, a volume is a persistent storage location that exists outside of the container. Volumes ... Read More