Not able to connect to postgres container when running spring boot container. I want to do it without using docker-compose

I am trying to docerize my spring boot application which uses posgtres. I am running postgres containter and while running app image spring boot not able to connect the data base. Getting below error. I am not using docker-compose as of now.

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<code>Caused by: org.postgresql.util.PSQLException: Connection to localhost:5432 refused. Check that the hostname and port are correct and that the postmaster is accepting TCP/IP connections.
at org.postgresql.core.v3.ConnectionFactoryImpl.openConnectionImpl(ConnectionFactoryImpl.java:346) ~[postgresql-42.7.3.jar!/:42.7.3]
at org.postgresql.core.ConnectionFactory.openConnection(ConnectionFactory.java:54) ~[postgresql-42.7.3.jar!/:42.7.3]
at org.postgresql.jdbc.PgConnection.<init>(PgConnection.java:273) ~[postgresql-42.7.3.jar!/:42.7.3]
at org.postgresql.Driver.makeConnection(Driver.java:446) ~[postgresql-42.7.3.jar!/:42.7.3]
at org.postgresql.Driver.connect(Driver.java:298) ~[postgresql-42.7.3.jar!/:42.7.3]
at com.zaxxer.hikari.util.DriverDataSource.getConnection(DriverDataSource.java:137) ~[HikariCP-5.1.0.jar!/:na]
at com.zaxxer.hikari.pool.PoolBase.newConnection(PoolBase.java:360) ~[HikariCP-5.1.0.jar!/:na]
at com.zaxxer.hikari.pool.PoolBase.newPoolEntry(PoolBase.java:202) ~[HikariCP-5.1.0.jar!/:na]
at com.zaxxer.hikari.pool.HikariPool.createPoolEntry(HikariPool.java:461) ~[HikariCP-5.1.0.jar!/:na]
at com.zaxxer.hikari.pool.HikariPool.checkFailFast(HikariPool.java:550) ~[HikariCP-5.1.0.jar!/:na]
at com.zaxxer.hikari.pool.HikariPool.<init>(HikariPool.java:98) ~[HikariCP-5.1.0.jar!/:na]
at com.zaxxer.hikari.HikariDataSource.getConnection(HikariDataSource.java:111) ~[HikariCP-5.1.0.jar!/:na]
at org.hibernate.engine.jdbc.connections.internal.DatasourceConnectionProviderImpl.getConnection(DatasourceConnectionProviderImpl.java:122) ~[hibernate-core-6.5.2.Final.jar!/:6.5.2.Final]
at org.hibernate.engine.jdbc.env.internal.JdbcEnvironmentInitiator$ConnectionProviderJdbcConnectionAccess.obtainConnection(JdbcEnvironmentInitiator.java:437) ~[hibernate-core-6.5.2.Final.jar!/:6.5.2.Final]
at org.hibernate.resource.transaction.backend.jdbc.internal.DdlTransactionIsolatorNonJtaImpl.getIsolatedConnection(DdlTransactionIsolatorNonJtaImpl.java:46) ~[hibernate-core-6.5.2.Final.jar!/:6.5.2.Final]
... 130 common frames omitted
Caused by: java.net.ConnectException: Connection refused
at java.base/sun.nio.ch.Net.pollConnect(Native Method) ~[na:na]
at java.base/sun.nio.ch.Net.pollConnectNow(Net.java:682) ~[na:na]
at java.base/sun.nio.ch.NioSocketImpl.timedFinishConnect(NioSocketImpl.java:542) ~[na:na]
at java.base/sun.nio.ch.NioSocketImpl.connect(NioSocketImpl.java:592) ~[na:na]
at java.base/java.net.SocksSocketImpl.connect(SocksSocketImpl.java:327) ~[na:na]
at java.base/java.net.Socket.connect(Socket.java:751) ~[na:na]
at org.postgresql.core.PGStream.createSocket(PGStream.java:243) ~[postgresql-42.7.3.jar!/:42.7.3]
at org.postgresql.core.PGStream.<init>(PGStream.java:98) ~[postgresql-42.7.3.jar!/:42.7.3]
at org.postgresql.core.v3.ConnectionFactoryImpl.tryConnect(ConnectionFactoryImpl.java:136) ~[postgresql-42.7.3.jar!/:42.7.3]
at org.postgresql.core.v3.ConnectionFactoryImpl.openConnectionImpl(ConnectionFactoryImpl.java:262) ~[postgresql-42.7.3.jar!/:42.7.3]
... 144 common frames omitted
</code>
<code>Caused by: org.postgresql.util.PSQLException: Connection to localhost:5432 refused. Check that the hostname and port are correct and that the postmaster is accepting TCP/IP connections. at org.postgresql.core.v3.ConnectionFactoryImpl.openConnectionImpl(ConnectionFactoryImpl.java:346) ~[postgresql-42.7.3.jar!/:42.7.3] at org.postgresql.core.ConnectionFactory.openConnection(ConnectionFactory.java:54) ~[postgresql-42.7.3.jar!/:42.7.3] at org.postgresql.jdbc.PgConnection.<init>(PgConnection.java:273) ~[postgresql-42.7.3.jar!/:42.7.3] at org.postgresql.Driver.makeConnection(Driver.java:446) ~[postgresql-42.7.3.jar!/:42.7.3] at org.postgresql.Driver.connect(Driver.java:298) ~[postgresql-42.7.3.jar!/:42.7.3] at com.zaxxer.hikari.util.DriverDataSource.getConnection(DriverDataSource.java:137) ~[HikariCP-5.1.0.jar!/:na] at com.zaxxer.hikari.pool.PoolBase.newConnection(PoolBase.java:360) ~[HikariCP-5.1.0.jar!/:na] at com.zaxxer.hikari.pool.PoolBase.newPoolEntry(PoolBase.java:202) ~[HikariCP-5.1.0.jar!/:na] at com.zaxxer.hikari.pool.HikariPool.createPoolEntry(HikariPool.java:461) ~[HikariCP-5.1.0.jar!/:na] at com.zaxxer.hikari.pool.HikariPool.checkFailFast(HikariPool.java:550) ~[HikariCP-5.1.0.jar!/:na] at com.zaxxer.hikari.pool.HikariPool.<init>(HikariPool.java:98) ~[HikariCP-5.1.0.jar!/:na] at com.zaxxer.hikari.HikariDataSource.getConnection(HikariDataSource.java:111) ~[HikariCP-5.1.0.jar!/:na] at org.hibernate.engine.jdbc.connections.internal.DatasourceConnectionProviderImpl.getConnection(DatasourceConnectionProviderImpl.java:122) ~[hibernate-core-6.5.2.Final.jar!/:6.5.2.Final] at org.hibernate.engine.jdbc.env.internal.JdbcEnvironmentInitiator$ConnectionProviderJdbcConnectionAccess.obtainConnection(JdbcEnvironmentInitiator.java:437) ~[hibernate-core-6.5.2.Final.jar!/:6.5.2.Final] at org.hibernate.resource.transaction.backend.jdbc.internal.DdlTransactionIsolatorNonJtaImpl.getIsolatedConnection(DdlTransactionIsolatorNonJtaImpl.java:46) ~[hibernate-core-6.5.2.Final.jar!/:6.5.2.Final] ... 130 common frames omitted Caused by: java.net.ConnectException: Connection refused at java.base/sun.nio.ch.Net.pollConnect(Native Method) ~[na:na] at java.base/sun.nio.ch.Net.pollConnectNow(Net.java:682) ~[na:na] at java.base/sun.nio.ch.NioSocketImpl.timedFinishConnect(NioSocketImpl.java:542) ~[na:na] at java.base/sun.nio.ch.NioSocketImpl.connect(NioSocketImpl.java:592) ~[na:na] at java.base/java.net.SocksSocketImpl.connect(SocksSocketImpl.java:327) ~[na:na] at java.base/java.net.Socket.connect(Socket.java:751) ~[na:na] at org.postgresql.core.PGStream.createSocket(PGStream.java:243) ~[postgresql-42.7.3.jar!/:42.7.3] at org.postgresql.core.PGStream.<init>(PGStream.java:98) ~[postgresql-42.7.3.jar!/:42.7.3] at org.postgresql.core.v3.ConnectionFactoryImpl.tryConnect(ConnectionFactoryImpl.java:136) ~[postgresql-42.7.3.jar!/:42.7.3] at org.postgresql.core.v3.ConnectionFactoryImpl.openConnectionImpl(ConnectionFactoryImpl.java:262) ~[postgresql-42.7.3.jar!/:42.7.3] ... 144 common frames omitted </code>
Caused by: org.postgresql.util.PSQLException: Connection to localhost:5432 refused. Check that the hostname and port are correct and that the postmaster is accepting TCP/IP connections.
        at org.postgresql.core.v3.ConnectionFactoryImpl.openConnectionImpl(ConnectionFactoryImpl.java:346) ~[postgresql-42.7.3.jar!/:42.7.3]
        at org.postgresql.core.ConnectionFactory.openConnection(ConnectionFactory.java:54) ~[postgresql-42.7.3.jar!/:42.7.3]
        at org.postgresql.jdbc.PgConnection.<init>(PgConnection.java:273) ~[postgresql-42.7.3.jar!/:42.7.3]
        at org.postgresql.Driver.makeConnection(Driver.java:446) ~[postgresql-42.7.3.jar!/:42.7.3]
        at org.postgresql.Driver.connect(Driver.java:298) ~[postgresql-42.7.3.jar!/:42.7.3]
        at com.zaxxer.hikari.util.DriverDataSource.getConnection(DriverDataSource.java:137) ~[HikariCP-5.1.0.jar!/:na]
        at com.zaxxer.hikari.pool.PoolBase.newConnection(PoolBase.java:360) ~[HikariCP-5.1.0.jar!/:na]
        at com.zaxxer.hikari.pool.PoolBase.newPoolEntry(PoolBase.java:202) ~[HikariCP-5.1.0.jar!/:na]
        at com.zaxxer.hikari.pool.HikariPool.createPoolEntry(HikariPool.java:461) ~[HikariCP-5.1.0.jar!/:na]
        at com.zaxxer.hikari.pool.HikariPool.checkFailFast(HikariPool.java:550) ~[HikariCP-5.1.0.jar!/:na]
        at com.zaxxer.hikari.pool.HikariPool.<init>(HikariPool.java:98) ~[HikariCP-5.1.0.jar!/:na]
        at com.zaxxer.hikari.HikariDataSource.getConnection(HikariDataSource.java:111) ~[HikariCP-5.1.0.jar!/:na]
        at org.hibernate.engine.jdbc.connections.internal.DatasourceConnectionProviderImpl.getConnection(DatasourceConnectionProviderImpl.java:122) ~[hibernate-core-6.5.2.Final.jar!/:6.5.2.Final]
        at org.hibernate.engine.jdbc.env.internal.JdbcEnvironmentInitiator$ConnectionProviderJdbcConnectionAccess.obtainConnection(JdbcEnvironmentInitiator.java:437) ~[hibernate-core-6.5.2.Final.jar!/:6.5.2.Final]
        at org.hibernate.resource.transaction.backend.jdbc.internal.DdlTransactionIsolatorNonJtaImpl.getIsolatedConnection(DdlTransactionIsolatorNonJtaImpl.java:46) ~[hibernate-core-6.5.2.Final.jar!/:6.5.2.Final]
        ... 130 common frames omitted
Caused by: java.net.ConnectException: Connection refused
        at java.base/sun.nio.ch.Net.pollConnect(Native Method) ~[na:na]
        at java.base/sun.nio.ch.Net.pollConnectNow(Net.java:682) ~[na:na]
        at java.base/sun.nio.ch.NioSocketImpl.timedFinishConnect(NioSocketImpl.java:542) ~[na:na]
        at java.base/sun.nio.ch.NioSocketImpl.connect(NioSocketImpl.java:592) ~[na:na]
        at java.base/java.net.SocksSocketImpl.connect(SocksSocketImpl.java:327) ~[na:na]
        at java.base/java.net.Socket.connect(Socket.java:751) ~[na:na]
        at org.postgresql.core.PGStream.createSocket(PGStream.java:243) ~[postgresql-42.7.3.jar!/:42.7.3]
        at org.postgresql.core.PGStream.<init>(PGStream.java:98) ~[postgresql-42.7.3.jar!/:42.7.3]
        at org.postgresql.core.v3.ConnectionFactoryImpl.tryConnect(ConnectionFactoryImpl.java:136) ~[postgresql-42.7.3.jar!/:42.7.3]
        at org.postgresql.core.v3.ConnectionFactoryImpl.openConnectionImpl(ConnectionFactoryImpl.java:262) ~[postgresql-42.7.3.jar!/:42.7.3]
        ... 144 common frames omitted

my application.properties file

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<code>server.port=9500
spring.application.name=test_service
#database
spring.datasource.url=jdbc:postgresql://${PGHOST:localhost}:${PGPORT:5432}/${POSTGRES_DB:test-dev1}
spring.datasource.username=postgres
spring.datasource.password=${POSTGRES_PASSWORD:abcd}
#JPA Config
spring.jpa.hibernate.ddl-auto=update
spring.jpa.show-sql=true
spring.jpa.properties.hibernate.dialect=org.hibernate.dialect.PostgreSQLDialect
</code>
<code>server.port=9500 spring.application.name=test_service #database spring.datasource.url=jdbc:postgresql://${PGHOST:localhost}:${PGPORT:5432}/${POSTGRES_DB:test-dev1} spring.datasource.username=postgres spring.datasource.password=${POSTGRES_PASSWORD:abcd} #JPA Config spring.jpa.hibernate.ddl-auto=update spring.jpa.show-sql=true spring.jpa.properties.hibernate.dialect=org.hibernate.dialect.PostgreSQLDialect </code>
server.port=9500
spring.application.name=test_service
#database
spring.datasource.url=jdbc:postgresql://${PGHOST:localhost}:${PGPORT:5432}/${POSTGRES_DB:test-dev1}
spring.datasource.username=postgres
spring.datasource.password=${POSTGRES_PASSWORD:abcd}

#JPA Config
spring.jpa.hibernate.ddl-auto=update
spring.jpa.show-sql=true
spring.jpa.properties.hibernate.dialect=org.hibernate.dialect.PostgreSQLDialect

postgres docker run command

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<code>docker run --network=bridge -e POSTGRES_PASSWORD=root -e POSTGRES_DB=test-dev --name postgresdb -p 5051:5432 -d postgres:16.4
</code>
<code>docker run --network=bridge -e POSTGRES_PASSWORD=root -e POSTGRES_DB=test-dev --name postgresdb -p 5051:5432 -d postgres:16.4 </code>
docker run --network=bridge -e POSTGRES_PASSWORD=root -e POSTGRES_DB=test-dev --name postgresdb -p 5051:5432 -d postgres:16.4

spring boot docker run command

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<code>docker run -it --name testservice -p 9100:9500 --network=bridge -e PGHOST=postgresdb -e PGPORT=5432 -e POSTGRES_DB=test-dev -e POSTGRES_PASSWORD=root test_service
</code>
<code>docker run -it --name testservice -p 9100:9500 --network=bridge -e PGHOST=postgresdb -e PGPORT=5432 -e POSTGRES_DB=test-dev -e POSTGRES_PASSWORD=root test_service </code>
docker run -it --name testservice -p 9100:9500 --network=bridge -e PGHOST=postgresdb -e PGPORT=5432 -e POSTGRES_DB=test-dev -e POSTGRES_PASSWORD=root test_service

I tried using –network attribute. Also I Tried to run in different ports also tried –link

3

You’ve got two unrelated problems here.

Application configuration

The fact that your testservice application is attempting to connect to localhost means that you’re not correctly configuring the application; it looks as if the PGHOST variable isn’t useful in the context of your application. Until you fix this problem, nothing else matters. You cannot reach postgres by connecting to localhost.

I don’t know anything about your application framework; maybe environment variables aren’t expanded in the configuration file? As a first pass, try replacing the environment variables with literal values:

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<code>spring.datasource.url=jdbc:postgresql://postgresdb:5432/test-dev
spring.datasource.username=postgres
spring.datasource.password=secret
</code>
<code>spring.datasource.url=jdbc:postgresql://postgresdb:5432/test-dev spring.datasource.username=postgres spring.datasource.password=secret </code>
spring.datasource.url=jdbc:postgresql://postgresdb:5432/test-dev
spring.datasource.username=postgres
spring.datasource.password=secret

Once you have things working with literal values, then you can start looking into why variable expansion wasn’t working as you expected.

Name lookups don’t work on the default bridge network

Name lookups don’t work on the default bridge network. One reason why docker compose is convenient is because it takes care of setting a user-defined network for you (and attaching your containers to it), but it doesn’t do anything that we can’t accomplish through other means.

You’ll need to first create a user-defined network:

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<code>docker network create mynetwork
</code>
<code>docker network create mynetwork </code>
docker network create mynetwork

And then attached your containers to this network:

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<code>docker run --network=mynetwork --name postgresdb -d
-e POSTGRES_USER=postgres
-e POSTGRES_PASSWORD=secret
-e POSTGRES_DB=test-dev docker.io/postgres:16.4
docker run -it --network=mynetwork --name testservice -p 9100:9500 test_service
</code>
<code>docker run --network=mynetwork --name postgresdb -d -e POSTGRES_USER=postgres -e POSTGRES_PASSWORD=secret -e POSTGRES_DB=test-dev docker.io/postgres:16.4 docker run -it --network=mynetwork --name testservice -p 9100:9500 test_service </code>
docker run --network=mynetwork --name postgresdb -d 
  -e POSTGRES_USER=postgres 
  -e POSTGRES_PASSWORD=secret 
  -e POSTGRES_DB=test-dev docker.io/postgres:16.4

docker run -it --network=mynetwork --name testservice -p 9100:9500 test_service

Note that I’ve made a couple of changes here to your docker commands:

  1. Both containers are attached to the mynetwork network.
  2. I’ve removed the port publishing on the postgres container; you can put it back if you really need it, but typically your database only needs to be accessed by your service (for debugging you can always docker exec into the postgres container).
  3. I’ve removed all the environment variables on the testservice container, since we’re not using them at the moment.

The equivalent docker compose configuration to the above would be:

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<code>services:
postgresdb:
image: docker.io/postgres:16.4
environment:
POSTGRES_USER: postgres
POSTGRES_PASSWORD: secret
POSTGRES_DB: test-dev
testservice:
image: test_service
ports:
- "9100:9500"
tty: true
stdin: true
</code>
<code>services: postgresdb: image: docker.io/postgres:16.4 environment: POSTGRES_USER: postgres POSTGRES_PASSWORD: secret POSTGRES_DB: test-dev testservice: image: test_service ports: - "9100:9500" tty: true stdin: true </code>
services:
  postgresdb:
    image: docker.io/postgres:16.4
    environment:
      POSTGRES_USER: postgres
      POSTGRES_PASSWORD: secret
      POSTGRES_DB: test-dev

  testservice:
    image: test_service
    ports:
    - "9100:9500"
    tty: true
    stdin: true

This should work; if you’d like to update your question with a [mcve] that I can run to test things out I would be happy to give that a try.

3

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