Volumes are ideal for storing database files or user-generated content that needs to survive container lifecycles. 2. Mount volumes in read-only mode for immutable data, such as configuration files or static content, to enhance security. This can be done with the command: docker run -d –name my-container –mount source=my-volume,target=/app,readonly nginx
3. Use named volumes instead of anonymous volumes whenever possible for better portability and management. 4. Regularly back up volume data using the docker run command to prevent data loss. An example command is: docker run –rm –volumes-from my-container -v $(pwd):/backup busybox tar cvf /backup/backup.tar /app
5. Use Docker Scout or Snyk for vulnerability scanning to identify and mitigate security risks in your containerized applications. Enable automatic vulnerability scanning on your repository through the settings menu of your preferred registry, such as Docker Hub. 6. Reduce image size by using Alpine Linux instead of Ubuntu or Debian, removing unnecessary packages with apt-get clean and rm -rf /var/lib/apt/lists/*, combining multiple commands into a single RUN statement to reduce the number of layers and improve caching, and placing instructions that are less likely to change before instructions that change frequently. 7. Use Docker Compose for managing multi-container applications instead of running each container separately with docker run. This can help optimize resource usage and simplify deployment. To further optimize disk I/O and preload Docker images, you can use the docker-squash tool to reduce image size by removing unnecessary metadata and layers from your images. Here’s how:
1. Install docker-squash on your machine using pip or another package manager. 2. Run a container with the source image that needs to be squashed, mounting any necessary volumes or directories as needed. 3. Use the docker commit command inside the running container to create a new intermediate image based on the current state of the container’s filesystem. This will capture all changes made since starting the container from the original source image. 4. Run the docker-squash tool in another terminal window, passing it the name or ID of the newly created intermediate image and any other necessary options (such as –output to specify a new output image name). The tool will analyze the intermediate image’s layers for redundancy and remove unnecessary metadata and data. 5. Once docker-squash has finished running, you can use the resulting squashed image in your Dockerfile or other workflows instead of the original source image. This can significantly reduce image size and improve disk I/O performance by reducing the number of layers that need to be loaded during container startup.