اتصال mongoose به دیتابیس سرور

سلام من میخوام وصل شم به یک دیتابیس و از کد زیر استفاده میکنم
mongoose.connect('mongodb://872db7a67f719c9152239525611ea376:drrhrt@host:mongodb://6a.mongo.evennode.com:27017/872db7a67f719c9152239525611ea376', { useNewUrlParser: true })

واین خطا رو دریافت میکنم

2018-07-27 15:58:04 0e335dc4b975 (node:31) UnhandledPromiseRejectionWarning: MongoNetworkError: failed to connect to server [host:27017] on first connect [MongoNetworkError: getaddrinfo ENOTFOUND host host:27017] 2018-07-27 15:58:04 0e335dc4b975 at Pool. (/data/app/node_modules/mongodb-core/lib/topologies/server.js:562:11) 2018-07-27 15:58:04 0e335dc4b975 at Pool.emit (events.js:182:13) 2018-07-27 15:58:04 0e335dc4b975 at Connection. (/data/app/node_modules/mongodb-core/lib/connection/pool.js:316:12) 2018-07-27 15:58:04 0e335dc4b975 at Object.onceWrapper (events.js:273:13) 2018-07-27 15:58:04 0e335dc4b975 at Connection.emit (events.js:182:13) 2018-07-27 15:58:04 0e335dc4b975 at Socket. (/data/app/node_modules/mongodb-core/lib/connection/connection.js:245:50) 2018-07-27 15:58:04 0e335dc4b975 at Object.onceWrapper (events.js:273:13) 2018-07-27 15:58:04 0e335dc4b975 at Socket.emit (events.js:182:13) 2018-07-27 15:58:04 0e335dc4b975 at emitErrorNT (internal/streams/destroy.js:82:8) 2018-07-27 15:58:04 0e335dc4b975 at emitErrorAndCloseNT (internal/streams/destroy.js:50:3) 2018-07-27 15:58:04 0e335dc4b975 at process._tickCallback (internal/process/next_tick.js:63:19) 2018-07-27 15:58:04 0e335dc4b975 (node:31) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). (rejection id: 1) 2018-07-27 15:58:04 0e335dc4b975 (node:31) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.