How to create a mirror in docker
Create a Docker image step: Write a Dockerfile that contains the build instructions. Build the image in the terminal, using the docker build command. Tag the image and assign names and tags using the docker tag command.
How to create a Docker image
Steps to create a Docker image:
-
Write Dockerfile:
- Write a Dockerfile that contains a series of instructions for building images.
- A Dockerfile is a text file that specifies which files, applications, and commands to include in the image.
-
Build the image:
- In the terminal, navigate to the directory where the Dockerfile is located.
- Run the
docker buildcommand to specify the path to the Dockerfile. - This will build a new image based on the directive specified in the Dockerfile.
-
Tag mirror:
- After building, use the
docker tagcommand to tag the new image. - This will assign a name and tag to the mirror so that it can be referenced later.
- After building, use the
Detailed description:
1. Write Dockerfile
A Dockerfile is a text file containing the following directives:
-
FROM: Specifies the existing image to be used as the base image. -
RUN: Execute commands in the container. -
COPY: Copy the file from the host to the container. -
ENV: Set environment variables. -
CMD: Specifies the command to run when the container starts.
A simple Dockerfile example might look like this:
<code>FROM ubuntu:latest RUN apt-get update && apt-get install -y nginx COPY index.html /usr/share/nginx/html CMD ["nginx", "-g", "daemon off;"]</code>
2. Build a mirror
Build the image by running the following command:
<code>docker build -t <dockerfile></dockerfile></code>
For example:
<code>docker build -t my-nginx /path/to/Dockerfile</code>
3. Mark the mirror
Tag mirroring is performed using the following command:
<code>docker tag </code>
For example:
<code>docker tag my-nginx my-nginx:latest</code>
This creates a new image named my-nginx:latest , which is based on my-nginx image.
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