Connect To Docker Compose MongoDb Via Spring boot application

Question

My web app can't connect to the MongoDB container

here are my application.yml

spring:
  data:
    mongodb:
      uri: mongodb://mongo:27017
      host: mongo
      port: 27017
      database: my-db-name

and this is my Docker-Compose

version: "3"
services:

  java:
    build:
      context: ./
    ports:
      - "8080:8080"
    links:
      - mongo
    depends_on:
      - mongo
    networks:
      - shared-net

  mongo:
    image: 'mongo'
    ports:
      - 27017:27017
    hostname: mongo
    volumes:
      - ./data/db:/data/db
    networks:
      - shared-net

networks:
  shared-net:
    driver: bridge

and this is the Dockerfile wrote for running java

FROM openjdk:11
COPY ./code/lemon-backend/target/lemon-0.0.1-SNAPSHOT.jar /usr/src/
WORKDIR /usr/src/
EXPOSE 8080
CMD ["java", "-jar", "lemon-0.0.1-SNAPSHOT.jar"]

I can't even build the application using these options I get this exception:

org.mongodb.driver.cluster: Exception in monitor thread while connecting to server mongo:27017

if possible try giving solutions with docker-compose, thanks

A common cause of this is the application starting up before the database is fully ready; while Compose will start the services in order it has know way of knowing when one is "ready". If you re-run docker-compose up again, does it work after a minute or so? — David Maze
– David Maze, Commented Dec 14, 2019 at 12:05
no, it wont.i even tried docker-compose up -d db to run the db only and tring to run the application later. — Farhad
– Farhad, Commented Dec 14, 2019 at 16:32
in adition to that i have the depends_on property which makes the db service come first — Farhad
– Farhad, Commented Dec 14, 2019 at 16:35

Farhad · Accepted Answer · 2021-01-23 14:35:11Z

12

OLD VERSION ANSWER

IMPORTANT NOTE: older versions of MongoDB ignore this configuration in application.properties, proceed ahead & use the new solutions I added

This workaround is used for old versions of spring and mongo that ignore the normal configuration (other than uri)

. I had a warning that this property cant be resolved but hopefully, it worked :)

dockerspring.data.mongodb.uri= mongodb://<your_mongodb_container_name>:27017/<name_of_your_db>

the mongodb part is not changeable but mongo before the port number is actually the name of the container witch you have specified in your docker-compose

SPRING BOOT SOLUTION

spring:
  data:
    mongodb:
      host: <mongo-db-container-name>
      port: <mongo-db-port>
      database: <database-name>

DOCKER SOLUTION

In Your Dockerfile Add This Option For Executing Java

ENTRYPOINT [“java”,”-Dspring.data.mongodb.uri=mongodb://mongo:27017/name_of_your_db”, “-Djava.security.egd=file:/dev/./urandom”,”-jar”,”/<name_of_your_app>.jar”]

Linking Java And Mongo Containers + Giving Them Names

here this is my final docker-compose.yml, I hope that it helps you

version: "3"
services:

  java:
    build:
      context: ./
    ports:
      - "8080:8080"
    container_name: java
    links:
      - mongo
    depends_on:
      - mongo
    networks:
      - shared-net
 
 mongo:
    image: 'mongo'
    ports:
      - 27017:27017
    container_name: mongo
    volumes:
      - /home/sinoed/data/db:/data/db
    networks:
      - shared-net

networks:
  shared-net:
    driver: bridge

Compare this version and the one specified in the question carefully

edited Jan 23, 2021 at 14:35

answered Dec 14, 2019 at 21:47

Farhad

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2 Comments

Thisisalexis Over a year ago

Great! Thanks for sharing your solution! I had the same problem and fixed it by applying your suggestions. The only thing I would add to your solution is that the DB host (specified both in Dockerfile and in Java application url properties file) is not necessarily named "mongo"; if in your Docker compose, you named the container (container_name property) as mongo_whatever, then that is the host name you are going to have to use. Thanks for posting this.

Farhad Over a year ago

Im glad that this was usefull. Yeah you are right i have used container_name in docker-compose.yml but i've forgot to mention it in the answer. Thanks for mentioning it ill edit the answer.

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