How to Mount a Local Folder into a Docker Container

Purpose 
 Bind-mount a local folder into a Docker container, enabling persistent storage and easy sharing of files between host and container. 
 
 1. Create the Local Folder 
 Create a folder on the host that you want to share: 
 mkdir -p ~/docker-data/myapp
 
 
 2. Set Correct Permissions 
 Ensure the folder is accessible by Docker containers: 
 chmod 755 ~/docker-data/myapp
 
 (Adjust permissions based on your security requirements.) 
 
 3. Run a Container with the Folder Mounted 
 Use the -v flag in Docker: 
 docker run -d \
 --name my-container \
 -v ~/docker-data/myapp:/app/data \
 my-docker-image
 
 
 Left side ( ~/docker-data/myapp ): Host path. 
 Right side ( /app/data ): Path inside the container. 
 
 
 4. Verify the Mount 
 Inside the container, the folder should appear: 
 docker exec -it my-container ls /app/data
 
 If you create files inside /app/data , they will appear inside your host folder too. 
 
 ✅ Summary 
 
 Bind-mounts connect host folders to containers. 
 Use absolute paths when mounting folders in production. 
 Ensure correct permissions to avoid container access issues. 
 
 
 🛠️ Useful Commands 
 
 Check container mounts: docker inspect my-container 
 Restart containers easily: docker restart my-container