What is a Dockerfile?
Before we get into what a Dockerfile is, it's vital to understand what a Docker image is.
If you're new to Docker, read this article to learn about Docker commands and virtualization.
Docker Image
A set of instructions for making a container. When these instructions are followed, a Docker container is created.
Dockerfile
It is a document or file containing various commands that are assembled to form a container.
The steps are listed below!
- First, we must create the image from a Dockerfile.
- Run the container containing the image.
Set the base image.
—>FROM [base image] —> FROM ubuntu
Set the container's working directory.
WORKDIR [dir] —> WORKDIR /usr/src/app
Execute a container image command.
—> RUN [cmd] TYPE rpm install -serve into the command prompt.
Files should be copied into the container.
COPY [local file/directories] [container files/directories]
COPY ./display ./display
Inform that the post should be made public.
—> EXPOSE [port] —> EXPOSE 8080
Set the container's default value.
CMD [exec format recommended] —> CMD [“default command”, “arguments”]
CMD [“node”, “serve”]
Test yourself with this quiz
- What exactly is Docker?
- What exactly is a Docker image?
- What is the difference between docker --version and docker version?
- What exactly is a Dockerfile?
- What exactly is a Docker Container?
- Docker Image Commands: What Are Some Examples?
- Use Cases for Docker Images?
- What are Docker Image Repositories?
- How Do You Make a Docker Image?
Also, take a look at the interview questions in this Java thread:
👉There are many ways to create a thread, and which is the best option to
create a thread create a thread and explain it with a scenario?
👉When we trigger the Java command, how many threads are going to be
created? Explain it?
👉 How do I change the main thread priority? What are min, norm, and max
priority?
👉 Explain wait(), notify(), and notifyAll()?
👉 How does multithreading work? What is the purpose of multithreading?
Conclusion
In this article, we learnt about Dockerfile, Docker image, and Dockerfile commands, as well as how to use them.
Continue reading for the most recent upgrades and approaches for learning Docker commands that every developer should know.