If you are reading this, it means you already have a docker container that you wish to alter so, we're going to do that!

To update a Docker container with the latest file changes, you typically have a few options. The approach you choose depends on the specific requirements of your application and the way your Docker image is built. Here are some common methods:

1. Build a New Image

If your changes involve modifications to the application code or dependencies, it's a good practice to rebuild the Docker image. This ensures that the changes are incorporated into the new image. Follow these general steps:

a. Update your source code or files:

Make the necessary changes to your application code or any other files that need to be updated.

b. Build a new Docker image:

Use the docker build command to create a new image. For example:

docker build -t your-image-name:latest .

Make sure to tag the new image appropriately. The . at the end of the command indicates the build context (current directory).

c. Run a new container:

Stop the existing container, if running, and start a new one with the updated image:

docker stop your-container-name
docker rm your-container-name
docker run -d --name your-container-name your-image-name:latest

2. Volume Mounts

If the changes involve only static files or configuration files that are separate from the application code, you can use volume mounts. This allows you to mount a host directory or file into the container, making it easier to update without rebuilding the entire image.

a. Update host files:

Update the files on your host machine that you want to sync with the container.

b. Stop and remove the existing container:

docker stop your-container-name
docker rm your-container-name

c. Run a new container with volume mounts:

docker run -d --name your-container-name -v /path/on/host:/path/in/container your-image-name:latest

Replace /path/on/host with the path on your host machine containing the updated files, and /path/in/container with the corresponding path inside the container.

3. Docker Compose

If you are using Docker Compose, you can update the service definition in your docker-compose.yml file and then use the docker-compose up command.

a. Update your docker-compose.yml:

Make necessary changes to your service definition, such as updating the image version or volumes.

b. Run Docker Compose:

docker-compose up -d

This will recreate the containers based on the updated configuration.

Choose the method that best fits your use case and the specific requirements of your application.

Conclusion

In conclusion, dockerizing an application is not just about encapsulating it within a container but maintaining it properly with proper configurations.

Thanks for reading it. I hope it was insightful and helped you get familiar with some new git commands. If you liked the article, please post likes/comments and share it in your circles.

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