Bind Mount

When you bind mount a file into a Docker container, you expect that updating the file on the host will immediately update the file inside the container. Yet many developers observe the opposite: the file content inside the container stays frozen at the old version. Interestingly, bind mounting a directory does not have this problem. The directory version updates correctly. This post explains why file bind mounts behave differently, why the issue occurs, and how Linux inode behavior is the root cause. ...

If you’ve ever worked with Docker Compose and encountered a situation where your container suddenly can’t see any files in a previously working mounted folder, you’re not alone. This issue can be especially frustrating when everything seems to work fine on the initial deployment, only to break inexplicably after redeploy. The Problem When a folder is bind-mounted into a Docker container using Docker Compose, it works correctly during the initial deployment. However, after a redeploy — particularly when triggered by automation tools like Portainer — the mounted folder inside the container becomes empty. ...