docker-nginx-application

Building a custom docker image using Ubuntu as a base docker image and running the nginx application. This docker image is built using a Dockerfile.

Step 1: Install Docker

#!/bin/bash
# Add Docker's official GPG key:
sudo apt-get update
sudo apt-get install ca-certificates curl
sudo install -m 0755 -d /etc/apt/keyrings
sudo curl -fsSL https://download.docker.com/linux/ubuntu/gpg -o /etc/apt/keyrings/docker.asc
sudo chmod a+r /etc/apt/keyrings/docker.asc

# Add the repository to Apt sources:
echo \
  "deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/docker.asc] https://download.docker.com/linux/ubuntu \
  $(. /etc/os-release && echo "$VERSION_CODENAME") stable" | \
  sudo tee /etc/apt/sources.list.d/docker.list > /dev/null
sudo apt-get update

# To install the latest version, run:
sudo apt-get install docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin

# Verify that the Docker Engine installation is successful by running the hello-world image.
sudo docker run hello-world

Start and Enable Docker:

Start the Docker service and enable it to run on system startup.

sudo systemctl start docker
sudo systemctl enable docker

Verify Docker Installation:

Run the following command to check if Docker was installed correctly.

docker --version

Step 2: Set Up Project Directory and Dockerfile Create a Project Directory:

mkdir nginx-docker
cd nginx-docker

Create a Dockerfile:

touch Dockerfile

Step 3: Write the Dockerfile Open the Dockerfile and add the following content:

# Use Ubuntu as the base image
FROM ubuntu:latest

# Update package list and install NGINX
RUN apt-get update && \
    apt-get install -y nginx && \
    rm -rf /var/lib/apt/lists/*

# Expose port 80 for HTTP traffic
EXPOSE 80

# Start NGINX when the container starts
CMD ["nginx", "-g", "daemon off;"]

Step 4: Build the Docker Image Run the following command to build the Docker image from the Dockerfile: The -t flag tags the image as custom-nginx for easy reference.

docker build -t custom-nginx .

Step 5: Run the Docker Container with Host Network Mode Run the container with the host network to make it accessible on the host’s public IP:

1. -d refers to run in detached mode.
2. The --network host option tells Docker to use the host network mode for the container.

docker run -d --name my-nginx-container --network host custom-nginx

Step 6: Test Access on Public IP Get the Host's Public IP Access NGINX: Open a browser(incognito mode preferred) and go to your public IP (http://) to view the default NGINX welcome page.

Notes:

1. Run the following command to check if your NGINX container is up and running.

   docker ps
   

2. If the container is not running, try to start it:

   docker start <my-nginx-container>
   

3. Check the logs of the NGINX container for any errors that might have occurred.

   docker logs <my-nginx-container>
   

4. To see if the image is created

   docker images