{ "additionalProperties": false, "id": "NtpServiceProperties", "properties": { "servers": { "items": { "$ref": "HostnameOrIPv4Address }, "required": true, "title": "NTP servers", "type": "array" }, "start_on_boot": { "default": true, "required": false, "title": "Start NTP service when system boots", "type": "boolean" } }, "title": "NTP Service properties", "type": "object" }