nix/hosts/dns/dhcp-failover.sh

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#!/usr/bin/env bash
set -euo pipefail
src_dns_server=192.168.1.2
# DHCP scopes to manage - put the name of each scope you have
dhcp_scopes=("local-home") # Use this array for one or many scopes
echo "Checking primary Technitium server status"
status_code=$(curl --write-out '%{http_code}' --silent --output /dev/null http://$src_dns_server:5380)
if [[ "$status_code" -ne 200 ]]; then
echo "Primary DNS/DHCP server is not available. Enabling DHCP on the secondary server."
action="enable"
else
echo "Primary DNS/DHCP server is available. Disabling DHCP on the secondary server."
action="disable"
fi
for scope in "${dhcp_scopes[@]}"; do
echo "Executing API call to $action DHCP scope: $scope"
response=$(curl -X POST "http://localhost:5380/api/dhcp/scopes/$action?token=$DNS1_API&name=$scope" \
--silent --write-out "%{http_code}")
echo "HTTP response code: $response"
if [[ "$response" == "200" ]]; then
echo "Successfully $action DHCP for scope: $scope"
else
echo "Failed to $action DHCP for scope: $scope. Check the response body for details."
fi
done