Delay the automount of drives (such as external NAS) at boot


#1

For those running wifi, sometimes that connection takes a little bit more time to actively connect on boot.

If you have a external NAS setup in /etc/fstab to automount, it may sporadically do so because of the slightly delayed wifi connections.

Since rc.local.service is now handled through systemd, you can manually create a delay script by creating a rc.local file in the /etc directory. By additionally making this file executable, it will be pulled automatically into the multi-user.target service. Systemd will handle execution of the rc.local delay script.

In a terminal window…

printf '%s\n' '#!/bin/bash' 'exit 0' | sudo tee -a /etc/rc.local
sudo chmod +x /etc/rc.local
sudo reboot

After a reboot, return to terminal and…

sudo gedit /etc/rc.local

Go ahead and paste the paste the following script in that file, then save…

#!/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
# value on error.
#
# In order to enable or disable this script just change the execution
# bits.
#
# By default this script does nothing.

# Print the IP address
#GS notes: a *minimum* of sleep 10 is required for the mount below to work on the Pi 3; it failed with sleep 5, but worked with sleep 10, sleep 15, and sleep 30
sleep 10
_IP=$(hostname -I) || true
if [ "$_IP" ]; then
  printf "My IP address is %s\n" "$_IP"
  mount -a #GS: mount all drives in /etc/fstab
fi

exit 0

You shouldn’t need to change any info, other than tailor the sleep time to your preference. This should create an automount delay of a time period of your choice, so that there are consistently automounted drives (fstab) while using wifi.

Links to the original articles…
https://askubuntu.com/questions/886620/how-can-i-execute-command-on-startup-rc-local-alternative-on-ubuntu-16-10

https://askubuntu.com/questions/399643/cifs-mount-through-fstab-not-mounting-at-boot

GM


#2

Also see /etc/network/if-up.d-based method on AskUbuntu. I used it for local SMB/CIFS share, but possible it should work with remotes too.