\>Setup CI server:
After launching the EC2 instance of type t2.micro which will be primarily used for coder management and packaging we have to install Docker and clone the code from the git repository to the CI server.
(Docker Installation)
Before moving forward we'll be installing docker by the command:
sudo apt-get update -y; sudo apt install docker.io -y
(Giving permission to Docker)
After the docker installation, to access docker commands we have to give user permission to the Docker using the below command.
sudo usermod -aG docker $USER
(Cloning the code from Git)
After Docker installation, we need the project code in our local machine to proceed further with image creation. To do so we have to clone the code from the GitHub repository, command given below:
git clone https://github.com/dushyantkumark/reddit-clone-k8s-ingress.git
Now above you can see we have got our project directory named reddit-clone-k8s-ingress.
do ls that shows the list and subdirectories of reddit-clone-k8s-ingress.
\>Containerizing the application with Docker
After getting the code in our Local machine we have to create the docker image of the code which will further be deployed.
Writing the Docker file for containerization
FROM node:19-alpine3.15
WORKDIR /reddit-clone
COPY . /reddit-clone
RUN npm install
EXPOSE 3000
CMD ["npm","run","dev"]
This Dockerfile creates a Docker image for a Reddit clone application using Node.js version 19 on Alpine Linux version 3.15.
The FROM instruction specifies the base image for the Docker image, which in this case is the node:19-alpine3.15 image.
The WORKDIR instruction sets the working directory for any subsequent instructions in the Dockerfile to /reddit-clone.
The COPY instruction copies the contents of the current directory (.) to the /reddit-clone directory in the Docker image.
The RUN instruction runs the npm install command to install the required dependencies for the Reddit clone application.
The EXPOSE instruction exposes port 3000 in the Docker image, which is the port used by the Reddit clone application.
The CMD instruction specifies the command to run when the Docker container is started, which in this case is the npm run dev command to start the application in development mode.
Overall, this Dockerfile sets up an environment to run a Node.js-based Reddit clone application, installs its dependencies, and starts the application in development mode on port 3000.
Building the Docker image from the above Dockerfile
After writing the Dockerfile we can build a Docker image out of it by using the command docker build . -t reddit-clone-k8s-ingress . This command builds a Docker image for the reddit clone application based on the Dockerfile.
Now above you can see an image redit-clone-k8s-ingress has been created and tagged. Using docker images you can see the image that has been created above:
Logging in to Docker Hub
Docker Hub is nothing but a hub of repositories containing docker Images. Once the image is built from the docker file, we have to push the image to the Docker hub so that during the deployment the image can be fetched from DockerHub itself. It works like GitHub.
So, to push the image we have to log in to our docker hub account from the CLI using the command:
docker login
Tag and Push the image to Docker Hub
Once the login is successful we can tag the image and then push the image to the docker hub by using the commands given below
docker push username/tagname:latest is the syntax:
docker tag reddit-clone-k8s-ingress dushyantkumark/reddit-clone-k8s-ingress
docker images
docker push dushyantkumark/reddit-clone-k8s-ingress:latest
Now from the above images from Docker Hub, you can see the image has been pushed.
Project Remaining part
For Kubernetes deployment, you can follow the link below
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The above information is up to my understanding. Suggestions are always welcome.
#github #dockerhub #reddit #DevOps #90daysofdevops #aws #project #happylearning #trainwithshubham
Shubham Londhe Sir
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