Installing a software watch dog
Useful on a linux (debian or ubuntu in this case) system, relies on a kernel software watchdog.
This one attempts to ensure tailscale is always running.
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sudo apt -y install watchdog
Create a watchdog.conf file:
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cat <<'EOF' | sudo tee -a /etc/watchdog.conf
realtime = yes
priority = 1
interval = 14
interface = enp0s9
repair-binary = /etc/watchdog.d/tailscale.sh
repair-maximum = 3
EOF
Create a check script /etc/watchdog.d/tailscale.sh:
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sudo mkdir -p /etc/watchdog.d
cat <<'EOF' | sudo tee /etc/watchdog.d/tailscale.sh
#!/usr/bin/bash
if [[ "test" == "$1" ]]; then
/usr/bin/tailscale status >/dev/null && exit 0
logger Attempting to restart tailscaled
/usr/bin/systemctl restart tailscaled && exit 0
/usr/bin/tailscale status |& logger
exit 1
elif [[ "repair" == "$1" ]]; then
logger Attempting to repair tailscaled
/usr/bin/systemctl restart tailscaled && exit 0
/usr/bin/tailscale status |& logger
exit 2
else
logger Unexpected tailscale.sh command: $0 $*
exit 3
fi
EOF
sudo chmod +x /etc/watchdog.d/tailscale.sh
Enable it:
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sudo systemctl enable watchdog
sudo systemctl start watchdog
sudo systemctl status watchdog