Deploying Docker Images in an Offline Environment: A Step-by-Step Guide

1. Introduction

In environments without internet connectivity—such as isolated corporate networks or highly secure internal systems—deploying Docker images requires an offline workflow. This article demonstrates how to handle Docker image deployment without network access.

2. Preparation

Two servers are used: Server A holds the original Docker image, and Server B is the target machine where the application will run. The example uses the nginx:1.21.6 image.

3. Server A

3.1 Pull the original image

On Server A execute: docker pull nginx:1.21.6 List images to verify:

docker images

3.2 Export the image

Export the image to a tar file using docker save: docker save -o nginx-1.21.6.tar nginx:1.21.6 This creates nginx-1.21.6.tar.

4. Server B

4.1 Transfer the tar file

Copy nginx-1.21.6.tar from Server A to Server B (e.g., to /var/local/).

4.2 Import the image

On Server B load the image with: docker load -i nginx-1.21.6.tar Verify the import: docker images You should see nginx:1.21.6 listed.

4.3 Run the container

Start a container to confirm the image works:

docker run --name nginx-test -p 10000:80 -d nginx:1.21.6

Access the service at http://192.168.88.131:10000/.