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 export command

The docker export command allows you to export a container's filesystem as a tar archive. This is useful when you want to create a backup of the container, share its filesystem, or migrate the container to another system. In this tutorial, we will walk through the basics of using the docker export command.

1. Prerequisites:

   • Install Docker on your system
   • Have a container that you want to export. If you don't have one, you can use the following example command to create a container:

   docker run -it --name example-container ubuntu:20.04 /bin/bash
   

   This command will start a new container based on the ubuntu:20.04 image and open an interactive shell session. The --name flag is used to assign a name to the container for easier reference.

2. Export the container filesystem:

   To export the container's filesystem as a tar archive, use the following syntax:

   docker export CONTAINER > output.tar
   

   Replace CONTAINER with the container ID or name, and output.tar with the desired output file name.

   For example, to export the example-container filesystem as a tar archive named example-container.tar, use:

   docker export example-container > example-container.tar
   

   This command will create a tar archive in the current directory containing the container's filesystem.

3. Inspect the exported filesystem:

   You can extract the contents of the tar archive to inspect the exported filesystem using the tar command:

   mkdir extracted-container
   tar -xf example-container.tar -C extracted-container
   

   This will extract the contents of example-container.tar into a new directory named extracted-container. You can now inspect the files and directories that were part of the container's filesystem.

4. Import the exported filesystem:

   If you want to import the exported filesystem as a new container or image, you can use the docker import command. For example, to import the example-container.tar as a new image, use:

   cat example-container.tar | docker import - example-image
   

   This will create a new image named example-image based on the exported filesystem. You can then run a new container using this image:

   docker run -it --name new-container example-image /bin/bash
   

In this tutorial, we covered the basics of using the docker export command to export a container's filesystem as a tar archive. The exported filesystem can be used to create backups, share data, or migrate containers between systems. Remember that the docker export command only exports the container's filesystem, not the metadata or the configuration settings of the container.

1. How to Use Docker Export Command:

   • Description: The docker export command allows you to export a container's filesystem as a tarball, which can be useful for creating backups or sharing container filesystems.
   • Code Example:

     docker export <container_id_or_name> > container_export.tar
     

2. Creating Tarballs with Docker Export:

   • Description: Docker export generates a tarball containing the entire filesystem of a container, which can be compressed for efficiency.
   • Code Example:

     docker export <container_id_or_name> | gzip > container_export.tar.gz
     

3. Docker Export Command Examples:

   • Description: Various examples showcasing different use cases of the docker export command.
   • Code Examples:

     docker export -o container_export.tar <container_id_or_name>
     docker export --output container_export.tar <container_id_or_name>
     

4. Exporting Docker Container Filesystem:

   • Description: Docker export captures the filesystem of a running or stopped container, allowing you to save it for later use.
   • Code Example:

     docker export <container_id_or_name> > container_export.tar
     

5. Importing Exported Containers with Docker:

   • Description: Use docker import to create a new image from an exported tarball, allowing you to reuse or share container filesystems.
   • Code Example:

     docker import container_export.tar my_imported_image