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How to Use Docker ComposeDocker Compose is a tool for defining and running multi-container Docker applications. It allows you to define all your application's services (containers), networks, and volumes in a single docker-compose.yml file, making it easy to manage your entire application stack with a single command.As a backend developer, Docker Compose is extremely useful when dealing with mul..

It's a common scenario in Docker for a container to exit immediately after starting. This usually happens because the command set in the container's CMD or ENTRYPOINT finishes quickly, or the core process that's supposed to run inside the container fails to start due to an error. To keep the container running and access it for debugging, you need to execute a "do-nothing" command that prevents i..

Why Use the Docker logs Command?The docker logs command is used to view the standard output (stdout) and standard error (stderr) streams of a running or already exited container. This is crucial for understanding the behavior of applications running inside containers and for troubleshooting issues.Key Reasons for Use:Application State Monitoring: Applications running within containers typically ..

A Docker Volume is the most recommended method for managing and maintaining data persistence in Docker containers. Containers are inherently ephemeral, meaning that when a container is deleted, all data stored within it also disappears. Volumes are used to solve this problem, allowing data to be shared between containers or exchanged between the host and containers.Key Features:Persistence: Data..

Container Creation and Execution Options (docker run)The docker run command is used to create and immediately run a container based on an image, and it offers various options to control how the container behaves.-d (detached mode):Explanation: Runs the container in the background. When this option is used, the container starts and doesn't occupy your terminal session. The terminal returns contro..

Using .dockerignore and Path NotationWhen building a Docker image, the COPY instruction copies files or folders from the host machine's build context into the image. At times, it becomes necessary to exclude specific files or folders from this process. Additionally, understanding how to specify paths is crucial.1. How to Use .dockerignoreA .dockerignore file functions similarly to a .gitignore f..

1. FROMDescription: The first instruction in almost every Dockerfile, it specifies the base image. The base image provides the fundamental operating system environment or runtime needed to build the new image.Role: Determines the initial environment from which the image will start.Examples:FROM ubuntu:22.04: Uses Ubuntu 22.04 as the base image.FROM openjdk:21-jdk: Uses an OpenJDK image with Java..

1. Finding Docker Images: docker images (or docker image ls)The docker images command displays a list of Docker images stored on your local system. It performs the same function as docker image ls.Basic Usage:orBashdocker image lsBashdocker imagesOutput Information Explained:REPOSITORY: The name of the image. (e.g., ubuntu, nginx, my-spring-app)TAG: A specific version or identifier for the image..

1. The docker pull CommandThe docker pull command is used to download a Docker image from a remote registry to your local machine.Basic Syntax:Bashdocker pull [OPTIONS] NAME[:TAG|@DIGEST]NAME (Image Name): This is the name of the image you want to download. Examples include ubuntu, nginx, mysql, openjdk, etc.TAG: This is an identifier that specifies a particular version of the image. For instan..

✅ What is Docker?Docker is a powerful tool that enables applications to run and be managed in isolated environments using container technology. Docker's true value becomes apparent only through direct use and experience. Its greatest advantage is the ability to deploy and run applications without complex environment configurations.✅ What is a Container?In Docker, the Container is a core concept...