How to configure spring-data-mongodb to use a replica set via properties

Question

I am currently writing an application which should use a replica set of MongoDB. It is a Spring Boot based application and the following properties work perfectly fine to connect to one server:

spring.data.mongodb.host=localhost
spring.data.mongodb.port=27017
spring.data.mongodb.database=demo

This is absolutely fine for my local dev environment. But later on it should run against a MongoDB replica set, so I have to provide at least 2, better 3 replica set seeds, but how can I do this with properties?

I had a look on this page: http://docs.spring.io/spring-boot/docs/current/reference/html/common-application-properties.html, but there is no explicit property for replica sets mentioned. Providing a comma separated list of addresses like this:

spring.data.mongodb.host=127.0.0.1,127.0.1.1,127.0.2.1
spring.data.mongodb.uri=mongo://127.0.0.1,mongo://127.0.0.1:27018

(I tried one after another.)

This is also not working (in fact, it produces an exception which lets Spring uses the default configuration).

I also tried to use the following config.xml, with no luck:

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
          xmlns:context="http://www.springframework.org/schema/context"
          xmlns:mongo="http://www.springframework.org/schema/data/mongo"
          xsi:schemaLocation=
          "http://www.springframework.org/schema/context
          http://www.springframework.org/schema/context/spring-context-3.0.xsd
          http://www.springframework.org/schema/data/mongo
          http://www.springframework.org/schema/data/mongo/spring-mongo-1.0.xsd
          http://www.springframework.org/schema/beans
          http://www.springframework.org/schema/beans/spring-beans-3.0.xsd">

    <mongo:mongo id="replicaSetMongo" replica-set="127.0.0.1:27017,localhost:27018"/>

</beans>

I know that the above configs are slightly different, but what I am currently trying is to get an exception which is showing me that no replica set node was reachable.

Any ideas, hints?

If you are using mongo atlas, this post will be helpful - https://www.opencodez.com/java/use-mongodb-atlas-with-spring-boot.htm — jmathewt, May 10 '20 at 04:26

Stephane Nicoll · Accepted Answer · 2019-01-27T15:52:56.283

23

There is no explicit support for that, no. But you should be able to configure that just fine via the uri parameter.

We've actually updated the documentation recently.

edited Jan 27 '19 at 15:52

answered Aug 06 '15 at 15:25

Stephane Nicoll

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Thanks for your answer Stephane. Which version is of Spring Data Mongo is supporting this sort of configuration property? – incredibleholg Aug 07 '15 at 16:38
Ok, I finally got some time to check this. It seems to work. But the log messages are not very clear about clusters (hopefully I will find some time to investigate and log an issue) Anyway, thanks for your quick help! – incredibleholg Aug 27 '15 at 08:40

score 22 · Answer 2 · edited Nov 29 '18 at 11:50

22

I had a similar problem and I dug into the MongoProperties::createMongoClient() code and found that the code was ignoring the uri value if there were any values configured for spring.data.mongodb.host, spring.data.mongodb.port, spring.data.mongodb.username or spring.data.mongodb.password.

If I put all that information in the URI (and removed all the other spring.data.mongodb.* values from the property file), the connection code worked.

The URI property setting ended up looking like this:

mongodb://username:mypasswd@hostname1:27017,hostname2:27017,hostname3:27017/dbname

The docs for formatting your URI value are here.

edited Nov 29 '18 at 11:50

Mihai Chelaru

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answered Jan 07 '16 at 01:28

nwolfe

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Thanks for commenting, I completely forgot to add this. Indeed, if any of the mentioned values is set, the URI is ignored. – incredibleholg Jan 07 '16 at 09:14
can you please tell where to add authentication database name in here? – Sameesh Jun 16 '20 at 08:30
when connecting to a replica set reads by default will be done from primary node unless explicitly specified to read from secondary right? – Fernando May 13 '21 at 18:24
does the replset option flag has to be specified?. What happens if not specified? – Fernando May 13 '21 at 18:26

score 9 · Answer 3 · answered Jan 14 '19 at 00:31

Change application.properties from this:

spring.data.mongodb.host=server1
spring.data.mongodb.port=27017
spring.data.mongodb.authentication-database=system
spring.data.mongodb.database=database

...to this:

spring.data.mongodb.uri=mongodb://username:password@server1:port,server2:port/database

How to configure spring-data-mongodb to use a replica set via properties

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