Docker deploys nodejs microservices

With the popularity of microservice architecture, more and more developers are choosing to use Docker containers to deploy their own applications. Docker has many advantages, such as strengthening the separation of development and operation and maintenance, shortening application deployment time, etc. This article will explore how to use Docker containers to deploy a Node.js microservices application.

1. Installing Docker

Before we begin, we need to install Docker. On Docker's official website, you can easily find installation packages for different operating systems (https://www.docker.com/community-edition).

After the installation is complete, you can enter docker version in the terminal to check whether the installation is successful.

2. Writing Dockerfile

In Docker, building an image requires a Dockerfile file. This file defines all the instructions required to build the image.

In this example, we will deploy a very simple Node.js microservice. We can build our image from the official Node.js image (https://hub.docker.com/_/node/). We will COPY our application code into the image and install the dependencies.

The following is a sample Dockerfile:

FROM node:latest

WORKDIR /app
COPY package.json /app
RUN npm install
COPY . /app

CMD ["npm", "start"]

The following is a brief description:

• FROM node:latest, from the official Build the image in the Node.js image.
• WORKDIR /app, set the working directory of the image to /app.
• COPY package.json /app, copy the package.json file to the /app directory.
• RUN npm install, install dependencies.
• COPY . /app, copy the application code to the /app directory.
• CMD ["npm", "start"], defines the default command when starting a container.

3. Build the image

Now, we already have the Dockerfile. We can use the command docker build to build our image.

Enter in the command line:

$ docker build -t my-node-app .

The . after this command indicates the Dockerfile in the current directory. The -t parameter is used to name our image. Here we name our image my-node-app.

4. Run the container

Now that we have an image, we can use the command docker run to run our container.

Enter in the command line:

$ docker run -p 3000:3000 my-node-app

The -p parameter in this command is used to map the port inside the container to our host. In this example, we map the container's port 3000 to our host's port 3000. This way we can access our application through http://localhost:3000.

5. Maintaining Containers

After we run a container, we need to know how to maintain it. Here are some commonly used commands:

• docker ps: View running containers.
• docker stop CONTAINER_ID: Stop a container, where CONTAINER_ID is the ID of the container we need to stop.
• docker rm CONTAINER_ID: Delete a container, where CONTAINER_ID is the ID of the container we need to delete.
• docker images: Check out our list of images.
• docker rmi IMAGE_ID: Delete a certain image, where IMAGE_ID is the ID of the image we need to delete.

6. Summary

In this article, we explored how to use Docker containers to deploy a Node.js microservices application. We used a Dockerfile to build our image and the docker run command to run our container. We also learned some common maintenance commands to help us manage our containers and images.

By using Docker containers, we can deploy our applications more conveniently and avoid potential environment and dependency conflicts, which improves our work efficiency and makes our applications more portable. sex.

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