jucke · March 29, 2018 13:30 · Mar 5, 2018 · Mar 5, 2018 · Mar 5, 2018 · Jan 29, 2018
diff --git a/README.md b/README.md
@@ -1,6 +1,10 @@
 # Install VirtualBox guest additions onto Ubuntu server guests
 Have tested these instructions successfully under an Ubuntu 16.04LTS guest with a VirtualBox 5.1 and 5.2 host.
 
+- [Install steps](#install-steps)
+- [Mount with guest/host permissions matched](#mount-with-guesthost-permissions-matched)
+- [Reference](#reference)
+
 ## Install steps
 - Create Ubuntu server instance under VirtualBox (obviously).
 - Start VM, goto **Devices - Insert Guest Additions CD image** to mount the ISO image.
@@ -24,7 +28,7 @@ Have tested these instructions successfully under an Ubuntu 16.04LTS guest with
 - Host shares should now be mounted in Ubuntu guest under `/media` via the installed `VBoxService` service, set to start on system boot-up.
 - All done.
 
-## Mount with guest/host permissions inline
+## Mount with guest/host permissions matched
 By default with auto mounted shares, VirtualBox will set an interesting set of ownership and file/directory permissions for the guest which (for me) is sub-optimal. To correct this behavior and mirror permissions between host and guest we can do the following:
 
 - Shut down the guest (if not already) and ensure "Auto-mount" is _disabled_.
@@ -58,3 +62,7 @@ By default with auto mounted shares, VirtualBox will set an interesting set of o
 	```
 
 - All done.
+
+## Reference
+- https://askubuntu.com/questions/123025/what-is-the-correct-way-to-share-directories-in-mac-and-ubuntu-with-correct-perm/123156#123156
+- https://askubuntu.com/questions/252853/how-to-mount-a-virtualbox-shared-folder-at-startup/252865#252865
diff --git a/README.md b/README.md
@@ -23,3 +23,38 @@ Have tested these instructions successfully under an Ubuntu 16.04LTS guest with
 
 - Host shares should now be mounted in Ubuntu guest under `/media` via the installed `VBoxService` service, set to start on system boot-up.
 - All done.
+
+## Mount with guest/host permissions inline
+By default with auto mounted shares, VirtualBox will set an interesting set of ownership and file/directory permissions for the guest which (for me) is sub-optimal. To correct this behavior and mirror permissions between host and guest we can do the following:
+
+- Shut down the guest (if not already) and ensure "Auto-mount" is _disabled_.
+- Restart the guest.
+- From the shell, determine the `umask` and `uid/gid` of your host user.
+
+	```sh
+	$ umask
+	0022
+	$ id
+	uid=1000(USERNAME) gid=1000(USERNAME) groups=1000(USERNAME),4(adm),24(cdrom),27(sudo),30(dip),46(plugdev),110(lxd),115(lpadmin),116(sambashare)
+	```
+
+- Now mount the share as follows:
+
+	```sh
+	$ mkdir --parents /path/to/share
+	$ sudo mount.vboxsf -o umask=UMASK,uid=UID,gid=GID SHARE_NAME /path/to/share
+	```
+
+- If all is good, we can now add an entry to our `/etc/fstab`:
+
+	```
+	SHARE_NAME /path/to/share vboxsf umask=UMASK,uid=UID,gid=GID 0 0
+	```
+
+- And remount all file systems
+
+	```sh
+	$ sudo mount -a
+	```
+
+- All done.
diff --git a/README.md b/README.md
@@ -1,6 +1,7 @@
-# Install VirtualBox 5.1/5.2 guest additions on Ubuntu server guest
-Have tested these instructions successfully under an Ubuntu 16.04LTS guest:
+# Install VirtualBox guest additions onto Ubuntu server guests
+Have tested these instructions successfully under an Ubuntu 16.04LTS guest with a VirtualBox 5.1 and 5.2 host.
 
+## Install steps
 - Create Ubuntu server instance under VirtualBox (obviously).
 - Start VM, goto **Devices - Insert Guest Additions CD image** to mount the ISO image.
 - From the terminal, run the following commands:

diff --git a/README.md b/README.md
@@ -1,4 +1,4 @@
-# Install VirtualBox 5.1 guest additions on Ubuntu server guest
+# Install VirtualBox 5.1/5.2 guest additions on Ubuntu server guest
 Have tested these instructions successfully under an Ubuntu 16.04LTS guest:
 
 - Create Ubuntu server instance under VirtualBox (obviously).

diff --git a/README.md b/README.md
@@ -8,7 +8,7 @@ Have tested these instructions successfully under an Ubuntu 16.04LTS guest:
 	```sh
 	$ sudo su
 	$ apt install gcc make
-	$ mkdir -p /media/cdrom
+	$ mkdir --parents /media/cdrom
 	$ mount /dev/cdrom /media/cdrom
 	$ /media/cdrom/VBoxLinuxAdditions.run
 	$ reboot
@@ -21,4 +21,4 @@ Have tested these instructions successfully under an Ubuntu 16.04LTS guest:
 	```
 
 - Host shares should now be mounted in Ubuntu guest under `/media` via the installed `VBoxService` service, set to start on system boot-up.
-- All done
+- All done.
diff --git a/README.md b/README.md
@@ -1,5 +1,5 @@
 # Install VirtualBox 5.1 guest additions on Ubuntu server guest
-Have tested these instructions successfully under Ubuntu 16.04LTS.
+Have tested these instructions successfully under an Ubuntu 16.04LTS guest:
 
 - Create Ubuntu server instance under VirtualBox (obviously).
 - Start VM, goto **Devices - Insert Guest Additions CD image** to mount the ISO image.

diff --git a/README.md b/README.md
@@ -17,7 +17,7 @@ Have tested these instructions successfully under Ubuntu 16.04LTS.
 - After reboot:
 
 	```sh
-	$ usermod --append --groups vboxsf USERNAME
+	$ sudo usermod --append --groups vboxsf USERNAME
 	```
 
 - Host shares should now be mounted in Ubuntu guest under `/media` via the installed `VBoxService` service, set to start on system boot-up.

diff --git a/README.md b/README.md
@@ -0,0 +1,24 @@
+# Install VirtualBox 5.1 guest additions on Ubuntu server guest
+Have tested these instructions successfully under Ubuntu 16.04LTS.
+
+- Create Ubuntu server instance under VirtualBox (obviously).
+- Start VM, goto **Devices - Insert Guest Additions CD image** to mount the ISO image.
+- From the terminal, run the following commands:
+
+	```sh
+	$ sudo su
+	$ apt install gcc make
+	$ mkdir -p /media/cdrom
+	$ mount /dev/cdrom /media/cdrom
+	$ /media/cdrom/VBoxLinuxAdditions.run
+	$ reboot
+	```
+
+- After reboot:
+
+	```sh
+	$ usermod --append --groups vboxsf USERNAME
+	```
+
+- Host shares should now be mounted in Ubuntu guest under `/media` via the installed `VBoxService` service, set to start on system boot-up.
+- All done