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VOOZH | about |
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VOOZH | about |
Docker is an open-source platform that enables developers to easily develop, ship, and run applications. It packages an application along with its dependencies in an isolated virtual container which usually runs on a Linux system and is quite light compared to a virtual machine. The reason is that a container shares the OS kernel with only its binaries/libraries loaded with it. To know more about docker, read Introduction to docker.
Table of Content
Nginx is mostly used as reverse proxy software. Nginx is an open-source web server you can perform multiple tasks with the nginx like scalability, efficiency, and flexibility it is specially designed for high performance which can be handled in scenarios where there is a high amount of incoming requests.
The following are the benefits of a Nginx server:
Containerization is OS-based virtualization that creates multiple virtual units in the userspace, known as Containers. Containers share the same host kernel but are isolated from each other through private namespaces and resource control mechanisms at the OS level. Container-based Virtualization provides a different level of abstraction in terms of virtualization and isolation when compared with hypervisors. Hypervisors use a lot of hardware which results in overhead in terms of virtualizing hardware and virtual device drivers. A full operating system (e.g -Linux, Windows) runs on top of this virtualized hardware in each virtual machine instance. Dockers provide a consistent and isolated environment for running the application, making them a popular choice for deploying the Nginx.
The following are the benefits of using Docker containers for nginx server:
When a user requests a page from a web server, the web server takes the request and sends an appropriate response back to the user. Nginx can be that web server. NGINX is an open-source web server that is also used for reverse proxy, HTTP load balancing, and email proxy. It is very efficient in using the system's resources and can handle a huge number of simultaneous requests using event-driven and asynchronous architecture. That is the reason why Nginx is an excellent choice for websites that deal with high loads like e-commerce, cloud storage, and search engines. To know more about Nginx refer to What is Nginx (Web Server) and how to install it?
Follow the steps mentioned below to pull the Nginx image by using Docker.
Step 1: Open the Docker server where it was installed.
Step 2: You can pull the docker nginx image type depending on the requirement of your organization like you use the community version or enterprise version depending on the requirement of the organization.
Step 3: By using the command mentioned below you can pull the nginx image by using Docker which is located in the DockerHub.
docker pull nginx:<Version>
Docker pull is a command that is used to pull any image you want to use and Nginx is the image that you can run as a container <version> you have to mention the version of the image based on your requirement. If you didn't mention any version then docker will automatically pull the latest version of the image.You can write your own Dockerfile to create a customized Docker Nginx image
One common problem that most developers face is when an application runs on one machine but doesn't on another. This can be due to different OS and different versions of libraries like a developer developed an application using nodejs 14.1 but the cloud instance has nodejs 9.2 installed.This is the exact problem that a docker container solves, it packages the app's libraries and all the dependencies, prebuilt and ready to be executed. It is isolated from other containers and makes the application feel that it is the only application running on the system.Many organizations are now moving to containers from virtual machines as containers are lightweight and easy to maintain using the provided CLI.It also helps in an easy adaptation of microservices architecture moving away from traditional monolithic systems. Other benefits include scalability, modification, and maintenance.
A docker image is just like a snapshot in VM environments. It records information about the docker container at a specific time like all the libraries along with their particular versions needed for an application. It is immutable but can be easily duplicated and shared with others.An image is usually shared with others in order to enable someone else to run the application in the same environment it is supposed to run and the image holds all the information about that environment.A Docker hub is one such platform where you can find and share container images with others. Some of the most common images are for Nginx, Nodejs,Mongo DB, and many more.
You can run Docker nginx image in by using following commad. But when you press CTRL +C then containers stops running because you are running the Docker container in the form of Attached mode when exit the container will stop running automatically.
docker run nginx
docker run -d nginx
-d indiactes that you are running the image in the form of detachd mode. To Know more about Docker Commands you can refer to Docker – Instruction Commands.
docker pull nginx:latest
docker images
docker run -p 8000:80 nginx
aboutme.html
docker run -d -p 8000:80 -v address_to_folder_with_files_locally:/usr/share/nginx/html --name my-nginx-server nginx
Output
docker stop my-nginx-server
# custom.conf
server {
listen 80;
server_name your_domain.com;
location / {
proxy_pass http://your_backend_service;
proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
# Add other proxy settings as needed
}
# Add other server block configurations as needed
}
# Use the official NGINX base image
FROM nginx:latest
# Copy the custom NGINX configuration file to the container
COPY <Path>
docker build -t <Nmae of the file> .
docker run -p 8080:80 <Name of the Image>
In docker advanced concepts you can use docker more efficiently can deploy the application with more feature and security. Following was the concepts of nginx deployment in docker containers.
In this article, we learned in brief about docker, container, images, and docker hub. Then we created a docker container using the official Nginx image from the docker hub and ran it. We also learned how we can list all the images on our system and how to stop a docker container. After that, we hosted a small webpage on the Nginx server running on a docker container.
