Docker Tutorial

• Docker Tutorial
• Docker Architecture

Docker Installation

• Ubuntu Docker Installation
• Debian Docker Installation
• CentOS Docker Installation
• Windows Docker Installation
• MacOS Docker Installation

How to use Docker

• Docker Hello World
• Docker Container
• Docker Image
• Docker Container Connection
• Docker Rpository
• Docker Dockerfile
• Docker Compose
• Docker Machine
• Docker Swarm

Docker Instance

• Docker install Ubuntu
• Docker install CentOS
• Docker install Nginx
• Docker install Node.js
• Docker install PHP
• Docker install MySQL
• Docker install Tomcat
• Docker install Python
• Docker install Redis
• Docker install MongoDB
• Docker install Apache

Docker Container Lifecycle Command

• Docker run command
• Docker start/stop/restart commands
• Docker kill command
• Docker rm command
• Docker pause/unpause command
• Docker create command
• Docker exec command

Docker Container Operation Command

• Docker ps command
• Docker inspect command
• Docker top command
• Docker attach command
• Docker events command
• Docker logs command
• Docker wait command
• Docker export command
• Docker port command

Docker Container rootfs Command

• Docker commit command
• Docker cp command
• Docker diff command

Docker Mirror Repository Command

• Docker login/logout command
• Docker pull command
• Docker push command
• Docker search command

Docker Local Image Management Command

• Docker images command
• Docker rmi command
• Docker tag command
• Docker build command
• Docker history command
• Docker save command
• Docker load command
• Docker import command

Docker info|version Command

• Docker info command
• Docker version command

Docker tag command

The docker tag command is used to create a new tag for a Docker image. Tags are aliases that can help you organize, identify, and manage your images. By default, when you build an image, it gets the latest tag. However, you can use custom tags to provide additional information about the image, such as its version or purpose. In this tutorial, we'll cover the basics of using the docker tag command.

Syntax:

docker tag SOURCE_IMAGE[:TAG] TARGET_IMAGE[:TAG]

• SOURCE_IMAGE: The name or ID of the existing image you want to create a new tag for.
• TAG: The existing or new tag for the source or target image.
• TARGET_IMAGE: The name of the new image you want to create with the specified tag.

Examples:

1. Create a new tag for an existing image:

   docker tag myrepository/myimage:latest myrepository/myimage:v1.0
   

   This command will create a new tag v1.0 for the image myrepository/myimage:latest. After running this command, you'll have two tags for the same image: latest and v1.0.

2. Tag an image with a new repository name:

   docker tag myrepository/myimage:latest newrepository/myimage:latest
   

   This command will create a new tag latest for the image myrepository/myimage:latest under a new repository named newrepository. This is useful when you need to reorganize your images or push them to a different registry.

After creating a new tag, you can use the docker push command to push the newly tagged image to a registry, such as Docker Hub:

docker push myrepository/myimage:v1.0

Replace myrepository/myimage:v1.0 with the name and tag of the image you want to push.

This tutorial should give you a basic understanding of how to use the docker tag command to create new tags for your Docker images. This can help you organize, identify, and manage your images more effectively.

1. How to Tag Docker Images:

   • Description: Tagging Docker images allows you to assign a label or version to an image.

   • Code Example:

     docker tag image_id my_repository/my_image:my_tag
     

2. Renaming Docker Images with the tag Command:

   • Description: Renaming Docker images is done by assigning a new tag to the existing image.

   • Code Example:

     docker tag old_image:old_tag new_image:new_tag
     

3. Docker tag vs Docker commit:

   • Description: docker tag is used to assign a new tag to an existing image, while docker commit creates a new image from changes made to a running container.

   • Code Example (docker commit):

     docker commit container_id my_new_image:tag
     

4. Managing Docker Image Versions with Tags:

   • Description: Use tags to manage different versions of Docker images, allowing for easy identification and rollback.

   • Code Example:

     docker tag my_image:latest my_image:v1.0
     

5. List and View Docker Image Tags:

   • Description: View all tags associated with a Docker image.

   • Code Example:

     docker images my_repository/my_image
     

6. Pushing Tagged Docker Images to a Registry:

   • Description: Pushing tagged images to a registry makes them accessible to others.

   • Code Example:

     docker push my_repository/my_image:my_tag
     

7. Docker tag Command Examples:

   • Example 1: Tagging an Image with Version:

     docker tag my_image my_repository/my_image:v1.0
     

   • Example 2: Tagging an Image with Latest Version:

     docker tag my_image my_repository/my_image:latest
     

   • Example 3: Tagging an Image with Multiple Tags:

     docker tag my_image my_repository/my_image:v1.0 my_repository/my_image:latest
     

   • Example 4: Tagging an Image from a Different Registry:

     docker tag my_registry/my_image:latest my_repository/my_image:latest
     

   • Example 5: Tagging an Image with Specific ID:

     docker tag image_id my_repository/my_image:my_tag