What is Docker Image?

What is Docker?

Docker is an open-source platform where developers can containerize the application. Containers are accessible before Docker but have gained popularity as a result of Docker. The most crucial aspects of Docker are the Docker Engine and Docker Hub. The first one works on your local system to run your program, and the second one is similar to a cloud service where we can share our docker images with everyone....

What is Dockerfile?

The Dockerfile uses DSL (Domain Specific Language) and contains instructions for generating a Docker image. Dockerfile will define the processes to quickly produce an image. While creating your application, you should create a Dockerfile in order since the Docker daemon runs all of the instructions from top to bottom....

What is Docker Image?

An artifact with several layers and a lightweight, compact stand-alone executable package that contains all of the components required to run a piece of software, including the code, a runtime, libraries, environment variables, and configuration files is called a Docker image....

What is Docker Container?

A container is a runtime instance of an image. Containers make development and deployment more efficient since they contain all the dependencies and parameters needed for the application it runs completely isolated from the host environment....

Dockerfile commands/Instructions

1. FROM...

Create a Dockerfile

Create a file named Dockerfile. Add instructions in Dockerfile. Build Dockerfile to create an image. Run the image to create a container....

Example 1: Steps To Create Dockerfile With Example(Jenkins)

In this example, we will write the Dockerfile for Jenkins and build an image by using Dockerfile which has been written for Jenkins and we will run it as a container....

Dockerfile for Jenkins image

We used JDK as a base image because Jenkins’s pre-requisite is JDK after that we added a command called MAINTAINER which indicates the author or owner of the docker file and we added the ENV variable where we set the path for the Jenkins and by using RUN command we are creating the path and by using ADD we are downloading the Jenkins and starting the .war file with the help of CMD command....

Example 2: Steps To Create Dockerfile

Step 1: Create a file name called “Dockerfile”.By default when you run the docker build commands docker searches for a file named Dockerfile. However, it is not compulsory, you can also give some different names, and then you can tell the docker that this particular file is local but for now we will go with the Dockerfile....

Conclusion

In this post, we’ve covered a few of the crucial commands and instructions that are frequently used in Dockerfiles and detailed how Dockerfile works using examples. It provided easy-to-grasp syntax and examples for each and every Dockerfile command....

Dockerfile – FAQs

What is Dockerfile Extension?...