What is Docker?
Docker is a tool designed to make it easier to create, deploy, and run applications by using containers. Containers allow a developer to package an application with all the parts it needs, such as libraries and other dependencies, and ship it all out as one package.
Benefits Of Docker.
- Standardization & productivity
- Compatibility & maintainability.
- Simplicity & faster configurations
- Rapid Deployment
- Continuous Deployment & Testing
I want to use docker
1. Install Docker on your OS
2. Create a DockerFile/ Download an exiting docker file. It is also called a Docker image
docker pull nginx
It will download the latest docker file from
Lets check if the docker image is downloaded
You should be able to see the nginx “image”
3. Create a running container out of an image
docker run --name my-nginx-container -d nginx
You will see a container Id on your screen. It means the container is running.
4. How do I know docker container is running?
docker ps -a
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES 5da9156d8480 nginx "nginx -g 'daemon ..." 51 seconds ago Up 51 seconds 80/tcp my-nginx-container.
This means the container is running and you can cross check first few characters of the containerId
5. How do I know what is running inside the container?
Let’s map a port from the outside (your laptop) to a docker port (inside the container)
Outside port: 8080
Docker Port: 80
(In this case, a new container will be created)
docker tun --name my-nginx-container2 -d -p 8080:80 nginx
Reach port 8080 on localhost
Voila !! nginx is running on your machine inside a Docker container.
READ: https://hub.docker.com/r/_/nginx/ for more info and complex cases.