How to create a mirror in docker

How to build a Docker image? Create a Dockerfile that contains build instructions. Build an image from a Dockerfile using the docker build command. Use the optional docker push command to push the image to the registry. Use the docker run command to run the container created from the image.

How to build images using Docker

Creating a Docker image is the process of packaging an application and all its dependencies into a single portable unit, enabling consistent deployment across environments. Here are the steps to build an image using Docker:

1. Create a Dockerfile

A Dockerfile is a text file containing a series of instructions detailing how to build an image. It must contain the following directive:

• FROM : Specify the basic image
• RUN : Run commands to install dependencies or perform other operations
• COPY : Copy files or directories from host to mirror
• CMD : Specifies the command to run when the image starts

2. Build a mirror

Use the following command to build an image from a Dockerfile:

 <code>docker build -t [镜像名称] [Dockerfile 路径]</code>

in:

• -t : Specify the image name
• [镜像名称] : The name of the image to be created
• [Dockerfile 路径] : The path of Dockerfile

3. Push mirror (optional)

If you want the image to be used on another machine, you can push it to the Docker registry:

 <code>docker push [镜像名称]</code>

4. Use mirrors

You can use the docker run command to run the container created from the image:

 <code>docker run [镜像名称] [命令]</code>

in:

• [镜像名称] : The name of the image to be run
• [命令] : The command to run when the container starts (optional)

Sample Dockerfile

Here is a sample Dockerfile for building a Node.js application image:

 <code>FROM node:16 WORKDIR /usr/src/app COPY package.json yarn.lock ./ RUN yarn install COPY . ./ CMD ["node", "index.js"]</code>

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