如何为 Spring 云配置服务器的客户端服务构建 Docker 映像

Question

I have built a Docker image for cloud config service. I have another service employee for which I want to build a Docker image. This client service will read data source configuration properties from the config server

I am able to connect the employee service successfully with config service on localhost without Docker. The problem is only that I am not able to build a Docker image for the employee service.

On running mvn package dockerfile:build command for the employee service I get the following error

***************************
APPLICATION FAILED TO START
***************************

Description:

Failed to configure a DataSource: 'url' attribute is not specified and no embedded datasource could be configured.

Reason: Failed to determine a suitable driver class

Below is the bootstrap.yml file located at src/main/resources directory

spring:
  application:
    name: employee
  profiles:
    active: dev
  cloud:
    config:
      uri: http://configserver:8071

Config service's bootstrap.yml file

spring:
  application:
    name: config-server
  profiles:
    active: native,dev
    
  cloud:
    config:
      server:
        #Local configuration: This locations can either of classpath or locations in the filesystem.
        native:
          #Reads from a specific filesystem folder 
          search-locations: classpath:/config
    
server:
  port: 8071

employee.properties file in config directory

spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
spring.jpa.database-platform=org.hibernate.dialect.MySQL5InnoDBDialect

employee-dev.properties file

spring.datasource.url=jdbc:mysql://db:3306/employee?allowPublicKeyRetrieval=true&useSSL=false
spring.datasource.username=root
spring.datasource.password=root

This is probably because the container of config server with hostname configserver is not up. I am not sure what hostname I should provide. Even if I want to build the image of employee service by starting the container of config server, it won't be on configserver host but on localhost . This is probably why the build is failing?

I want to build the Docker image of employee service so that its container can be fired up using the docker-compose up command

Edit: This question is similar but I already have the spring-cloud-starter-config dependency added in my client service and it still gives me the same error on build

Edit 2

You don't have to separately build a Docker image for the client service at all!

When I ran docker-compose up command I noticed the following line in output

c.c.c.ConfigServicePropertySourceLocator : Fetching config from server at : http://configserver:8071

But I was still not sure if it was actually reading the data from the config server. So I purposely added incorrect database credentials in config server properties file for my service and the service startup failed! Now I am sure that my employee service is reading the data from the config server

I am still not sure how can I achieve creating a new Docker image for my employee service.

Answer 1

Did you try changing the URL param db to actual host of vhostname?

db =change it to IP addess or accessable load balancer URL

spring.datasource.url=jdbc:mysql://db:3306/employee?allowPublicKeyRetrieval=true&useSSL=false