Micronaut + PostgreSQL + Docker-compose issue - postgresql

Question

I'm trying to run a Micronaut service that uses PostgreSQL on a docker-compose file. But I'm having the following issue:
21:12:32.741 [main] INFO com.zaxxer.hikari.HikariDataSource - HikariPool-1 - Starting...
21:12:33.744 [main] ERROR com.zaxxer.hikari.pool.HikariPool - HikariPool-1 - Exception during pool initialization.
org.postgresql.util.PSQLException: The connection attempt failed.
at org.postgresql.core.v3.ConnectionFactoryImpl.openConnectionImpl(ConnectionFactoryImpl.java:315)
at org.postgresql.core.ConnectionFactory.openConnection(ConnectionFactory.java:51)
at org.postgresql.jdbc.PgConnection.<init>(PgConnection.java:225)
at org.postgresql.Driver.makeConnection(Driver.java:465)
at org.postgresql.Driver.connect(Driver.java:264)
at com.zaxxer.hikari.util.DriverDataSource.getConnection(DriverDataSource.java:138)
at com.zaxxer.hikari.pool.PoolBase.newConnection(PoolBase.java:358)
at com.zaxxer.hikari.pool.PoolBase.newPoolEntry(PoolBase.java:206)
at com.zaxxer.hikari.pool.HikariPool.createPoolEntry(HikariPool.java:477)
at com.zaxxer.hikari.pool.HikariPool.checkFailFast(HikariPool.java:560)
at com.zaxxer.hikari.pool.HikariPool.<init>(HikariPool.java:115)
at com.zaxxer.hikari.HikariDataSource.<init>(HikariDataSource.java:81)
at io.micronaut.configuration.jdbc.hikari.HikariUrlDataSource.<init>(HikariUrlDataSource.java:35)
at io.micronaut.configuration.jdbc.hikari.DatasourceFactory.dataSource(DatasourceFactory.java:66)
at io.micronaut.configuration.jdbc.hikari.$DatasourceFactory$DataSource0Definition.build(Unknown Source)
at io.micronaut.context.BeanDefinitionDelegate.build(BeanDefinitionDelegate.java:153)
at io.micronaut.context.DefaultBeanContext.doCreateBean(DefaultBeanContext.java:1979)
at io.micronaut.context.DefaultBeanContext.createAndRegisterSingletonInternal(DefaultBeanContext.java:2768)
at io.micronaut.context.DefaultBeanContext.createAndRegisterSingleton(DefaultBeanContext.java:2754)
at io.micronaut.context.DefaultBeanContext.getBeanForDefinition(DefaultBeanContext.java:2425)
at io.micronaut.context.DefaultBeanContext.getBeanInternal(DefaultBeanContext.java:2399)
at io.micronaut.context.DefaultBeanContext.getBean(DefaultBeanContext.java:1264)
at io.micronaut.context.AbstractBeanDefinition.getBeanForConstructorArgument(AbstractBeanDefinition.java:1014)
at io.micronaut.configuration.hibernate.jpa.$EntityManagerFactoryBean$HibernateStandardServiceRegistry0Definition.doBuild(Unknown Source)
at io.micronaut.context.AbstractParametrizedBeanDefinition.build(AbstractParametrizedBeanDefinition.java:118)
at io.micronaut.context.BeanDefinitionDelegate.build(BeanDefinitionDelegate.java:149)
at io.micronaut.context.DefaultBeanContext.doCreateBean(DefaultBeanContext.java:1979)
at io.micronaut.context.DefaultBeanContext.createAndRegisterSingletonInternal(DefaultBeanContext.java:2768)
at io.micronaut.context.DefaultBeanContext.createAndRegisterSingleton(DefaultBeanContext.java:2754)
at io.micronaut.context.DefaultBeanContext.getBeanForDefinition(DefaultBeanContext.java:2425)
at io.micronaut.context.DefaultBeanContext.getBeanInternal(DefaultBeanContext.java:2399)
at io.micronaut.context.DefaultBeanContext.getBean(DefaultBeanContext.java:1264)
at io.micronaut.context.AbstractBeanDefinition.getBeanForConstructorArgument(AbstractBeanDefinition.java:1014)
at io.micronaut.configuration.hibernate.jpa.$EntityManagerFactoryBean$HibernateMetadataSources1Definition.doBuild(Unknown Source)
at io.micronaut.context.AbstractParametrizedBeanDefinition.build(AbstractParametrizedBeanDefinition.java:118)
at io.micronaut.context.BeanDefinitionDelegate.build(BeanDefinitionDelegate.java:149)
at io.micronaut.context.DefaultBeanContext.doCreateBean(DefaultBeanContext.java:1979)
at io.micronaut.context.DefaultBeanContext.createAndRegisterSingletonInternal(DefaultBeanContext.java:2768)
at io.micronaut.context.DefaultBeanContext.createAndRegisterSingleton(DefaultBeanContext.java:2754)
at io.micronaut.context.DefaultBeanContext.loadContextScopeBean(DefaultBeanContext.java:2292)
at io.micronaut.context.DefaultBeanContext.initializeContext(DefaultBeanContext.java:1562)
at io.micronaut.context.DefaultApplicationContext.initializeContext(DefaultApplicationContext.java:234)
at io.micronaut.context.DefaultBeanContext.readAllBeanDefinitionClasses(DefaultBeanContext.java:2905)
at io.micronaut.context.DefaultBeanContext.start(DefaultBeanContext.java:231)
at io.micronaut.context.DefaultApplicationContext.start(DefaultApplicationContext.java:180)
at io.micronaut.runtime.Micronaut.start(Micronaut.java:71)
at org.wcode.author.service.ApplicationKt.main(Application.kt:10)
Caused by: java.net.UnknownHostException: st-database
at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:220)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
at java.net.Socket.connect(Socket.java:609)
at org.postgresql.core.PGStream.createSocket(PGStream.java:231)
at org.postgresql.core.PGStream.<init>(PGStream.java:95)
at org.postgresql.core.v3.ConnectionFactoryImpl.tryConnect(ConnectionFactoryImpl.java:98)
at org.postgresql.core.v3.ConnectionFactoryImpl.openConnectionImpl(ConnectionFactoryImpl.java:213)
... 46 common frames omitted
Files definition
Following is the definition of the files that I'm using on my current project.
docker-compose.yml
version: '3.8'
services:
st-author-service:
image: author-service:latest
environment:
- JDBC_URL=jdbc:postgresql://st-database:5432/sentency_db
- JDBC_USER=<USERNAME>
- JDBC_PASSWORD=<PASSWORD>
- JDBC_DRIVER=org.postgresql.Driver
depends_on:
- st-database
networks:
- database-network
- internal
st-database:
image: postgres:13.3-alpine
restart: always
env_file:
- database.env # configure postgres
volumes:
- database-data:/var/lib/postgresql/data/
networks:
- database-network
volumes:
database-data:
networks:
database-network:
driver: bridge
external: false
internal:
application.yml
micronaut:
application:
name: authorService
server:
port: 7000
datasources:
default:
url: ${JDBC_URL:`jdbc:h2:mem:testdb;DB_CLOSE_DELAY=-1;DB_CLOSE_ON_EXIT=FALSE`}
username: ${JDBC_USER:sa}
password: ${JDBC_PASSWORD:""}
driverClassName: ${JDBC_DRIVER:org.h2.Driver}
schema-generate: CREATE_DROP
jpa:
default:
entity-scan:
packages: 'org.wcode.author.service.domain.entities'
properties:
hibernate:
hbm2ddl:
auto: update
show_sql: true
Tests
I tested the application.yml pointing to a PostgreSQL database deployed on Docker and it worked, the problem started when I tried to use docker-compose to structure the deployment. To check if the network definition was working I deployed pgAdmin together with that configuration and I was able to connect to the database.
After that specific line:
Caused by: java.net.UnknownHostException: st-database
I come to the conclusion that the issue was caused by the host not being found.
I already made a lot of research and haven't found a way to solve that problem. I can't see what I'm missing.
Thanks in advance for all the help.
Update
I was able to get the connection log from the PostgreSQL container and only pgAdmin connection is appearing, the service is not even reaching the container to connect. The network being used is the same. Here is the log:
2021-08-10 15:43:13.465 GMT [100] LOG: connection received: host=sentency-deploy_pgAdmin_1.sentency-deploy_database-network port=40848
2021-08-10 15:43:13.466 GMT [100] LOG: connection authorized: user=user database=postgres
2021-08-10 15:43:13.478 GMT [101] LOG: connection received: host=sentency-deploy_pgAdmin_1.sentency-deploy_database-network port=40850
2021-08-10 15:43:13.479 GMT [101] LOG: connection authorized: user=user database=sentency_db
2021-08-10 15:43:13.491 GMT [102] LOG: connection received: host=sentency-deploy_pgAdmin_1.sentency-deploy_database-network port=40852
2021-08-10 15:43:13.493 GMT [102] LOG: connection authorized: user=user database=postgres
2021-08-10 15:43:17.750 GMT [103] LOG: connection received: host=sentency-deploy_pgAdmin_1.sentency-deploy_database-network port=40858
Now I think the problem could be the way I'm building the image. My current Dockerfile is:
FROM ghcr.io/graalvm/graalvm-ce:ol7-java11-21.2.0 as build
WORKDIR /author-service
COPY . /author-service
RUN yum install -y -q xz
RUN curl -sL -o - https://github.com/upx/upx/releases/download/v3.96/upx-3.96-amd64_linux.tar.xz | tar xJ
RUN gu install native-image
RUN ./gradlew assemble
RUN native-image --no-fallback --static -jar /author-service/build/libs/author-service-*-all.jar service
RUN ./upx-3.96-amd64_linux/upx -7 /author-service/service
FROM scratch
EXPOSE 7000:7000
COPY --from=build /author-service/service /service
ENTRYPOINT ["./service"]
That's giving me an image of 27.67MB.

Answer 1

From the docker compose documentation: depends_on does not wait for [st-database] to be “ready”. So maybe this is caused by the Postgres database not being ready to accept connections at the time your app tries to. The UnknownHostException is a bit strange in that case but that may depend on when docker is binding the port. To fix the problem you would need to write a script that waits for readiness as in the second example here.