gistfile1.txt

Instructions for trying ext4+overlay with docker! In an up-to-date SDK:

Write the following to /build/amd64-usr/etc/portage/package.keywords/overlay

sys-kernel/coreos-sources
sys-kernel/coreos-kernel
sys-fs/btrfs-progs
app-emulation/docker

In src/scripts make the following change to switch to ext4:

--- a/build_library/disk_layout.json
+++ b/build_library/disk_layout.json
@@ -66,8 +66,7 @@
         "label":"ROOT",
         "type":"coreos-resize",
         "blocks":"4427776",
-        "fs_type":"btrfs",
-        "fs_subvolume":"root",
+        "fs_type":"ext4",
         "mount":"/"
       }
     },


Build packages/images/etc. Boot a vm and write the following to
/etc/systemd/system/docker.service.d/overlay.conf

[Service]
Environment=DOCKER_DRIVER=overlay

Now systemctl daemon-reload, restart docker and do that docker thang