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-# Filesystem
-
-[TOC]
-
-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"
-            ]
-       }
-    }
-}
-```