How about Docker? Detailed explanation of deployment process

Docker is an open source application container engine that can package applications in containers and run them quickly and reliably in any environment. Docker is lightweight, fast, easy to deploy, and cross-platform, so it has become one of the popular application deployment tools. This article will introduce the deployment process of Docker.

1. Install Docker

First, you need to install Docker on the target server. Docker supports multiple operating systems, such as Linux, Windows, etc. For Linux systems, it is recommended to use the distribution's package manager to install Docker. For example, on Ubuntu, you can execute the following command to install Docker:

sudo apt-get update
sudo apt-get install docker-ce docker-ce-cli containerd.io

2. Preparing Docker images

In Docker, images are the building blocks of applications and can be deployed into containers. Docker images can be built using Dockerfiles. A Dockerfile is a text file that contains instructions and parameters for building an image. For example, here is a simple Dockerfile for launching a Node.js-based web application:

# Using the base image of Node.js version 10
FROM node:10

# Create working directory
WORKDIR /app

# Copy application code
COPY package*.json ./
COPY src/ ./src/

# Installation Dependencies
RUN npm install --production

# Expose port
EXPOSE 3000

# Start application
CMD ["npm", "start"]

To build an image, please use the following command:

docker build -t my-app .

Among them, the -t flag is used to specify the name and label of the image. The image name here is my-app and the label is latest. The dot indicates that the Dockerfile is located in the current directory.

3. Run the Docker container

After building the Docker image, you can run the container. Before running a container, you need to select a Docker image. You can use the following command to list the available images:

docker image ls

Next, you can use the following command to start a new Docker container:

docker run - p 3000:3000 my-app:latest

Among them, the -p flag is used to specify the port that needs to be mapped between the container and the host. Here, the container's port 3000 is mapped to the host's port 3000. my-app:latest represents the name and label of the image to be run.

4. Enter the Docker container

In the Docker container, you can use the following command to execute the command:

docker exec -it container-id bash

Among them, the -it flag is used to specify the use of an interactive terminal and allocate a pseudo terminal. container-id is the ID of the Docker container.

5. View Docker logs

When running an application in a Docker container, you may need to view the application's logs. You can use the following command to view the container's logs:

docker logs container-id

6. Stop the Docker container

If you no longer need to run the Docker container, You can use the following command to stop the container:

docker stop container-id

or use the following command to kill the container:

docker kill container-id

Docker's deployment process is like this and can be adjusted according to actual application scenarios. Using Docker for application deployment can improve the portability and scalability of applications.

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