Question 81605 in Docker Question posted in
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Unable to connect to postgresql setup on a docker container from Java code

I have installed a postgres image on a docker container –

I also installed pgadmin and connected the postgres and pgadmin by adding them to a docker network. I am able to connect to the db via pgadmin

I now want to access this local-postgres instance from within my java code, but I get an error that the connection attempt failed.

What am I missing here?


docker run --name pgadmin -e "[email protected]" -e "PGADMIN_DEFAULT_PASSWORD=admin" -p 5050:80 -d dpage/pgadmin4 

docker network create --driver bridge pgnetwork

docker network connect pgnetwork local-postgres

docker network connect pgnetwork pgadmin

below are the application.properties file settings


spring.jpa.hibernate.ddl-auto=update

spring.jpa.hibernate.show-sql=true

spring.datasource.url=jdbc:postgresql://local-postgres:5432/db-java-docker
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2

Answers


  1. 0

    I suppose that you forgot to add to your config file login and password for db:

    spring.datasource.username: DB_USERNAME

    spring.datasource.password: DB_PASSWORD

    where DB_USERNAME and DB_PASSWORD so that you created docker postgres container

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  2. 0

    Are you running your java application via Docker inside of pgnetwork? If not, the local-postgres hostname will not resolve. If you don’t want to run the java application via docker, you’ll have to give the postgres port a mapped host port that will let you resolve it via localhost. Here’s an example:

    # Maps the postgres port to port 5051 on your localhost
$ docker run 
  --name local-postgres 
  -e POSTGRES_USER=postgres 
  -e POSTGRES_PASSWORD=password 
  -e POSTGRES_DB=db-java-docker 
  -p 5051:5432 
  postgres:14

    spring.datasource.url=jdbc:postgresql://postgres:password@localhost:5051/db-java-docker
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