How do I run a script as sudo at boot time on Ubuntu 18.04 Server?

Question

How do I run a script as sudo at boot time?

I need to run ethtool --offload <net> rx off to disable the annoying jme udp checksum error message.

Answer 1

You can create a systemd service.

Create a file /etc/systemd/system/ethtool.service:

[Unit]
Description=ethtool script

[Service]
ExecStart=/path/to/yourscript.sh

[Install]
WantedBy=multi-user.target

And script /path/to/yourscript.sh (don't forget to chmod +x it)

#!/bin/bash
ethtool --offload <net> rx off

Enable your service

systemctl enable ethtool

It will run on boot as root.

Answer 2

Put your commands in /etc/rc.local or create that file if it does not exist:

 touch /etc/rc.local
 chmod +x /etc/rc.local

All these actions have to be done as root.