Docker MongoNetworkError: connection timed out when build Node JS App by docker

Question

Cann't connect to Mongodb. That installed by Docker

let dbRoute = "mongodb://mongo:27017/kgp_news"

const option = {
    socketTimeoutMS: 30000,
    keepAlive: true,
    reconnectTries: 30000,
    useNewUrlParser: true 
};

mongoose.connect(dbRoute, option)

I install mongo by docker. It run port 27017.

And when I run project by script "node index.js". it is working.

But when I build app by write Dockerfile. Cann't connect to Mongo. MongoNetworkError: connection timed out

    at Pool.<anonymous> (/api_kgp/docker_build/node_modules/mongodb-core/lib/topologies/server.js:431:11)
    at Pool.emit (events.js:198:13)
    at connect (/api_kgp/docker_build/node_modules/mongodb-core/lib/connection/pool.js:557:14)
    at makeConnection (/api_kgp/docker_build/node_modules/mongodb-core/lib/connection/connect.js:39:11)
    at callback (/api_kgp/docker_build/node_modules/mongodb-core/lib/connection/connect.js:261:5)
    at Socket.err (/api_kgp/docker_build/node_modules/mongodb-core/lib/connection/connect.js:286:7)
    at Object.onceWrapper (events.js:286:20)
    at Socket.emit (events.js:198:13)
    at Socket._onTimeout (net.js:442:8)
    at ontimeout (timers.js:436:11)
    at tryOnTimeout (timers.js:300:5)
    at listOnTimeout (timers.js:263:5)
    at Timer.processTimers (timers.js:223:10)
(node:20) 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)
(node:20) [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.

mongo in node.js server, can you ping mongo ? and telnet to port 27017 — Thanh Nguyen Van
– Thanh Nguyen Van, Commented Jul 10, 2019 at 2:17
@ThanhNguyenVan i try and this result: PING mongo.com (54.173.82.137) 56(84) bytes of data. It seem working. — Võ Cát Thư
– Võ Cát Thư, Commented Jul 10, 2019 at 5:28

Thanh Nguyen Van · Accepted Answer · 2019-07-10 02:45:09Z

7

mongo were installed on container so please make sure:

Expose 27017 port when you run to build container,

docker run -p 27017:27017 ....
In node code, connect to mongo container using : IP address gateway of container network is 172.17.0.1:27017

So:

let dbRoute = "mongodb://172.17.0.1:27017/kgp_news"

answered Jul 10, 2019 at 2:45

Thanh Nguyen Van

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4 Comments

Võ Cát Thư Over a year ago

Yes. It's woking now. Thank you very much. So now when connect with any container of docker using this "172.17.0.1", right?

Thanh Nguyen Van Over a year ago

yes, that's right ! its differ from port as belong to service

Hiro Over a year ago

But docker documentation says you can use dns alias if the containers are under the same user defined bridge network.

Usman Iqbal Over a year ago

While running test cases using mocha I was getting timeout error, i used the above and it worked like a charm.

prisar · Accepted Answer · 2019-07-10 05:56:07Z

0

use localhost of the docker container is running.

let dbRoute = "mongodb://localhost:27017/kgp_news"

const option = {
    socketTimeoutMS: 30000,
    keepAlive: true,
    reconnectTries: 30000,
    useNewUrlParser: true 
};

mongoose.connect(dbRoute, option)

Or, you can put the IP address of mongodb condtiner. To get IP off mongodb conatiner use $ docker inspect --format='{{range .NetworkSettings.Networks}}{{.IPAddress}}{{end}}' $INSTANCE_ID

let dbRoute = "mongodb://<MONGODB_IP_ADDRESS>:27017/kgp_news"

const option = {
    socketTimeoutMS: 30000,
    keepAlive: true,
    reconnectTries: 30000,
    useNewUrlParser: true 
};

mongoose.connect(dbRoute, option)

edited Jul 10, 2019 at 5:56

answered Jul 10, 2019 at 2:25

prisar

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1 Comment

prisar Over a year ago

then put the IP of docker container running. however this ip will change everytime you start you mongodb container.

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