Pushing Your Docker Images to Docker Hub

Introduction: Docker

Docker is a platform that enables developers to build, package, and deploy applications in containers. Containers are lightweight, portable, and self-sufficient units that contain everything needed to run an application, including the code, runtime, libraries, and dependencies. Docker simplifies the process of creating and managing containers, making it easier to develop, ship, and run applications across different environments.

Here are some key components and concepts of Docker:

1. Docker Engine: The core component of Docker, responsible for running and managing containers on a host system. It consists of a daemon process (dockerd) and a command-line interface (CLI) tool (docker) that allows users to interact with Docker.
2. Containers: Containers are isolated environments that encapsulate an application and its dependencies, ensuring consistency and reproducibility across different environments. Each container runs as a separate process, with its own filesystem, network, and resources, but shares the host system's kernel.
3. Images: Docker images are read-only templates used to create containers. They contain the application code, runtime, libraries, and dependencies needed to run the application. Images are built from Dockerfiles, which specify the instructions for creating the image.
4. Dockerfile: A Dockerfile is a text file that contains a series of instructions for building a Docker image. It defines the environment and configuration for the application, including the base image, dependencies, environment variables, and commands to run.
5. Docker Hub: Docker Hub is a cloud-based registry service provided by Docker, where users can store, share, and discover Docker images. It serves as a central repository for Docker images, allowing users to pull and push images to and from their local Docker environment.
6. Docker Compose: Docker Compose is a tool for defining and running multi-container Docker applications. It uses a YAML file (docker-compose.yml) to define the services, networks, and volumes needed for the application, making it easy to manage complex application stacks.
7. Swarm Mode: Docker Swarm is Docker's native clustering and orchestration tool, which allows users to create and manage a cluster of Docker hosts as a single virtual system. Swarm Mode enables automatic load balancing, scaling, and failover of containerized applications across multiple nodes.

Docker Hub:

Docker Hub serves as a centralized repository for Docker images, allowing developers to share and distribute their containerized applications easily. Pushing your Docker images to Docker Hub enables seamless deployment across different environments and facilitates collaboration with other developers. In this blog post, I'll walk you through the process of pushing Docker images to Docker Hub, step by step.

Step 1:Install Docker

Before you can push Docker images to Docker Hub, ensure that Docker is installed on your system. You can download and install Docker Desktop for your operating system from the official Docker website.

We can also install docker on AWS EC2 instance.

• First of all you have to login on your AWS account
• Launch an EC2 instance Choose Amazon Linux Machine
• Connect your Instance
• Then run these commands to install docker

sudo su
yum update -y
yum install docker -y
service docker start        

Now run these commands to Create Container

docker run -it --name <container name> ubuntu /bin/bash        

replace <container name > with your container name you can choose any image which you want to make container i have choose ubuntu.

Now create some files under container

touch file1 file2 file3 file4        

Step 2: Create an image

Now create an image of this container

docker commit <container name> image1        

you can give any name to your image i have given image1 to my image.

If you have docker hub account it is good if you don't have account so create account first.

you can go to chrome and search docker hub , now you can see docker hub home page you have to fill your email and type password for your docker hub account , you can receive an confirmation email and your docker hub account is created.

Step 3: Login to Docker

Now go to your EC2 instance. Write code to login into Docker hub.

docker login        

you have to give username and password.

Step 4: Give tag to your image

Now give tag to your image , run these commands.

docker tag image1 dockerid/newimage        

give your dockerid username and new image name.

Step 5: Push image

now run these commands to push your image into docker hub.

docker push dockerid/newimage        

You can see this image in your docker hub account.

If you want to check that if this image will accessible or not you can , simply launch an instance in another region and pull image from hub , you have to run these commands :

docker pull dockerid/newimage
docker run -it --name mycontainer dockerid/newimage /bin/bash        

That's all , you can see all files that are created in container1 that are shown in new container that is made in another region.

Conclusion:

Pushing Docker images to Docker Hub is a straightforward process that allows you to share your containerized applications with the broader community. By following the steps outlined in this guide, you can easily push your Docker images to Docker Hub and leverage the benefits of containerization and collaboration in your development workflow. Start pushing your Docker images today and empower your projects with Docker Hub's robust ecosystem.

Thank you Mr. Ashutosh Singhal sir for your incredible guidance. #aws #docker #linkedin #learn