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----
-title: "Filesystem"
-permalink: /docs/user_guide/filesystem/
-layout: docs
-category: User Guide
-weight: 40
----
-
-gVisor accesses the filesystem through a file proxy, called the Gofer. The gofer
-runs as a separate process, that is isolated from the sandbox. Gofer instances
-communicate with their respective sentry using the 9P protocol. For a more detailed
-explanation see [Overview > Gofer](../../architecture_guide/#gofer).
-
-## Sandbox overlay
-
-To isolate the host filesystem from the sandbox, you can set a writable tmpfs overlay
-on top of the entire filesystem. All modifications are made to the overlay, keeping
-the host filesystem unmodified.
-
-> Note: All created and modified files are stored in memory inside the sandbox.
-
-To use the tmpfs overlay, add the following `runtimeArgs` to your Docker configuration
-(`/etc/docker/daemon.json`) and restart the Docker daemon:
-
-```json
-{
-    "runtimes": {
-        "runsc": {
-            "path": "/usr/local/bin/runsc",
-            "runtimeArgs": [
-                "--overlay"
-            ]
-       }
-    }
-}
-```
-
-## Shared root filesystem
-
-The root filesystem is where the image is extracted and is not generally modified
-from outside the sandbox. This allows for some optimizations, like skipping checks
-to determine if a directory has changed since the last time it was cached, thus
-missing updates that may have happened. If you need to `docker cp` files inside the
-root filesystem, you may want to enable shared mode. Just be aware that file system
-access will be slower due to the extra checks that are required.
-
-> Note: External mounts are always shared.
-
-To use set the root filesystem shared, add the following `runtimeArgs` to your Docker
-configuration (`/etc/docker/daemon.json`) and restart the Docker daemon:
-
-```json
-{
-    "runtimes": {
-        "runsc": {
-            "path": "/usr/local/bin/runsc",
-            "runtimeArgs": [
-                "--file-access=shared"
-            ]
-       }
-    }
-}
-```