update to remove machine-id

vm-dehydrate

@@ -7,26 +7,30 @@
 echo "Removing openssh-server's host keys..."
 rm -vf /etc/ssh/ssh_host_*
 cat /dev/null > /etc/rc.local
-cat << EOF >> /etc/rc.local
+cat << 'EOL' | sudo tee /etc/rc.local
 #!/bin/sh -e
 #
 # rc.local
 #
 # This script is executed at the end of each multiuser runlevel.
-# Make sure that the script will "exit 0" on success or any other
+# Make sure that the script will "" on success or any other
 # value on error.
 #
 # In order to enable or disable this script just change the execution
 # bits.
 #
 # By default this script does nothing.
- 
-rm -vf /root/vm-dehydrate > /dev/null
- 
-dpkg-reconfigure openssh-server > /dev/null
- 
+# dynamically create hostname (optional)
+if hostname | grep localhost; then
+    hostnamectl set-hostname "$(head /dev/urandom | tr -dc A-Za-z0-9 | head -c 13 ; echo '')"
+fi
+test -f /etc/ssh/ssh_host_dsa_key || dpkg-reconfigure openssh-server
+if [ ! -f /etc/machine-id ]
+then
+  /usr/bin/systemd-machine-id-setup
+fi
 exit 0
-EOF
+EOL
  
 echo "Cleaning up /var/mail..."
 rm -vf /var/mail/*
@@ -61,6 +65,7 @@ find /var/log -type f -exec truncate -s0 \{\} \;
 echo "Compacting drive..."
 dd if=/dev/zero of=EMPTY bs=1M > /dev/null
 rm -vf /root/EMPTY
+fstrim -av
  
 echo "Clearing bash history..."
 cat /dev/null > /root/.bash_history