SystemD Services
My laptop has a strange issues where the DNS servers don't work after suspending, unless I ping them. This systemd service pings them every 5 seconds.
/etc/systemd/system/ping-all-the-time.service
[Unit]
Description=Ping DNS Servers to keep them working
[Service]
Type=simple
RemainAfterExit=yes
ExecStart=/usr/local/bin/ping-all-the-time.sh
StandardOutput=null
[Install]
WantedBy=multi-user.target
And the script:
/usr/local/bin/ping-all-the-time.sh
#!/bin/bash
while true; do
echo "ping 1.2.3.4 at `date`"
ping -W 2 -c 1 1.2.3.4 -q > /dev/null
echo "ping 5.6.7.8 at `date`"
ping -W 2 -c 1 5.6.7.8 -q > /dev/null
sleep 5;
done
Once it's all set up, reload the systemd daemon
sudo systemctl daemon-reload
And enable your service
sudo systemctl enable ping-all-the-time.service