How to deploy applications on CentOS

Complete Guide to Deploying Docker Applications on CentOS Systems

This article walks you through the steps to deploy Docker applications on a CentOS server, covering the entire process from Docker installation to application management.

Step 1: Install Docker

First, make sure your CentOS system has been updated to the latest version:

 sudo yum update -y

Then, install the Docker engine:

 sudo yum install -y docker-ce docker-ce-cli containerd.io

Start Docker service and set up booting:

 sudo systemctl start docker
sudo systemctl enable docker

Step 2: Configure the Docker daemon (optional)

To enhance security and optimize performance, it is recommended to configure the Docker daemon. Create or edit the /etc/docker/daemon.json file and add the following:

 {
  "exec-opts": ["native.cgroupdriver=systemd"],
  "log-driver": "json-file",
  "log-opts": {
    "max-size": "100m"
  },
  "storage-driver": "overlay2"
}

Restart the Docker service to make the configuration take effect:

 sudo systemctl restart docker

Step 3: Pull the Docker image

Use the docker pull command to download the required Docker image. For example, to deploy an Nginx web server:

 sudo docker pull nginx

Step 4: Run Docker container

Use the docker run command to run the Docker container. The following command starts an Nginx container named my-nginx and maps the host's port 80 to the container's port 80:

 sudo docker run --name my-nginx -d -p 80:80 nginx

Step 5: Deploy custom applications (optional)

If you need to deploy your own app, you need to package it into a Docker image. Here is an example of using Python applications:

• Create Dockerfile: Create a file named Dockerfile in your application directory, the content is as follows:

 # Use the official Python basic mirror FROM python:3.9-slim

# Set the working directory WORKDIR /app

# Copy the application code COPY . /app

# Installation dependency RUN pip install --no-cache-dir -r requirements.txt

# Exposed port EXPOSE 5000

# Run the application CMD ["python", "app.py"]

• Build the image: Run the following command to build the Docker image:

 sudo docker build -t my-app .

• Run the container: Run your application container with the following command:

 sudo docker run -d -p 5000:5000 --name my-app-container my-app

Step 6: Verify the deployment

Visit http://:5000 in your browser (if your application listens to port 5000) to verify that your application is running normally.

Step 7: Manage Docker Containers

You can manage Docker containers using the following command:

• View all containers: sudo docker ps -a
• Stop container: sudo docker stop
• Start the container: sudo docker start
• Delete container: sudo docker rm

Through the above steps, you can successfully deploy and manage Docker applications on a CentOS server. Please adjust the port mapping and Dockerfile configuration according to your actual application requirements.

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