英文:
Getting "Exception opening socket" on Mongodb connection from Spring App (docker-compose)
问题
尽管在应用程序属性中我将主机名设置为容器名和 MongoDB 在 docker-compose 文件中的主机名，
spring.data.mongodb.host=api-database4
作为主机名，这是 MongoDB 的容器名称和主机名，但 Spring 应用程序仍然无法连接到 MongoDB 实例。然而，我可以从 MongoDB Compass 连接到 localhost:27030，但无法连接到 mongodb://api-database4:27030/messagingServiceDb。
我的 docker-compose 文件如下：
version: '3'
services:
messaging-api6:
container_name: 'messaging-api6'
build: ./messaging-api
restart: always
ports:
- 8085:8080
depends_on:
- api-database4
networks:
- shared-net
api-database4:
image: mongo
container_name: api-database4
hostname: api-database4
restart: always
ports:
- 27030:27017
networks:
- shared-net
command: mongod --bind_ip_all
networks:
shared-net:
driver: bridge
我的 Spring 应用程序的 Docker 文件如下：
FROM openjdk:12-jdk-alpine
ARG JAR_FILE=target/*.jar
COPY ${JAR_FILE} app.jar
ENTRYPOINT ["java","-jar","/app.jar"]
我的 application.properties 文件如下：
#Local MongoDB config
spring.data.mongodb.database=messagingServiceDb
spring.data.mongodb.port=27030
spring.data.mongodb.host=api-database4
完整的代码可以在 这里 查看。
如何使我的运行在 Docker 容器中的 Spring 应用程序能够连接到另一个 Docker 容器中的 MongoDB 实例？
我已经尝试了类似问题的解决方案并复制了它们，但仍然出现相同的错误。
编辑和解决方案：
我通过将下面的配置注释掉来解决了这个问题，
#Local MongoDB config
#spring.data.mongodb.database=messagingServiceDb
spring.data.mongodb.host=api-database4
spring.data.mongodb.port=27030
剩下的问题是，为什么呢？那个端口就是我尝试连接的正确端口。这可能与配置顺序有关吗？
英文:
Even though I'm giving in the application properties,
spring.data.mongodb.host=api-database4
as the hostname which is the container name and hostname of the MongoDB on the docker-compose file, Spring app still can't connect to the MongoDB instance. I can however connect from MongoDB Compass to localhost:27030 but not to mongodb://api-database4:27030/messagingServiceDb.
My docker-compose file;
version: '3'
services:
messaging-api6:
container_name: 'messaging-api6'
build: ./messaging-api
restart: always
ports:
- 8085:8080
depends_on:
- api-database4
networks:
- shared-net
api-database4:
image: mongo
container_name: api-database4
hostname: api-database4
restart: always
ports:
- 27030:27017
networks:
- shared-net
command: mongod --bind_ip_all
networks:
shared-net:
driver: bridge
and my Docker file for the Spring app is;
FROM openjdk:12-jdk-alpine
ARG JAR_FILE=target/*.jar
COPY ${JAR_FILE} app.jar
ENTRYPOINT ["java","-jar","/app.jar"]
and my application.properties are;
#Local MongoDB config
spring.data.mongodb.database=messagingServiceDb
spring.data.mongodb.port=27030
spring.data.mongodb.host=api-database4
Entire code can be seen here.
How can I make my spring app on a docker container create a connection to the MongoDB instance which is on another docker container?
I have tried the solutions on similar questions and replicated them, it still gives the same error.
Edit and Solution:
I solved the issue by commenting out configuration below,
#Local MongoDB config
#spring.data.mongodb.database=messagingServiceDb
spring.data.mongodb.host=api-database4
spring.data.mongodb.port=27030
The remaining question is, why? That was the correct port that I'm trying to connect. Could it be related to the configuration order?
答案1
得分: 1
docker-compose 中的 ports 指令将容器端口发布到主机机器上。这些容器使用暴露的端口进行彼此通信。您可以使用 netcat 测试一个容器是否能够访问另一个容器。
docker exec -it messaging-api6 bash
> apt-get install netcat
> nc -z -v api-database4 27030
> nc -z -v api-database4 27017
英文:
ports directive in docker-compose publishes container ports to the host machine. The containers communicate with each other on exposed ports. You can test whether a container can reach another with netcat.
docker exec -it messaging-api6 bash
> apt-get install netcat
> nc -z -v api-database4 27030
> nc -z -v api-database4 27017
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