WildFly Postgres DataSource remote connection-url ignored

Question

I am running into some configuration troubles in setting up a Keycloak server in standalone clustered mode. Despite configuring the datasource to use a postgres database on {REMOTE_IP}, it is failing to start the server complaining that it cannot connect to localhost:5432.

I've been searching all over but I'm befuddled why the DataSource would try to connect to localhost when the connection-url is set to a remote host.

Is there any mistake in my configuration? How can I figure out why PG is trying to connect to localhost instead of {REMOTE_IP}

---

My setup is 1 Postgres database server and 2 Keycloak servers

I followed the installation instructions for using a relational database and have added the JDBC drivers v9.4.1212 for Postgres.

My DataSource configuration is as follows:

<datasource jndi-name="java:jboss/datasources/KeycloakDS" pool-name="KeycloakDS" enabled="true" use-java-context="true">
    <connection-url>jdbc:postgresql://{REMOTE_IP}:5432/keycloak</connection-url>
    <driver>postgresql</driver>
    <pool>
        <max-pool-size>20</max-pool-size>
    </pool>
    <security>
        <user-name>keycloak</user-name>
        <password>{PASSWORD}</password>
    </security>
</datasource>

The error message from the logs reads:

...
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:262)
    at org.postgresql.core.ConnectionFactory.openConnection(ConnectionFactory.java:52)
    at org.postgresql.jdbc.PgConnection.<init>(PgConnection.java:216)
    at org.postgresql.Driver.makeConnection(Driver.java:404)
    at org.postgresql.Driver.connect(Driver.java:272)
    at java.sql.DriverManager.getConnection(DriverManager.java:664)
    at java.sql.DriverManager.getConnection(DriverManager.java:247)
    at org.postgresql.ds.common.BaseDataSource.getConnection(BaseDataSource.java:86)
    at org.postgresql.ds.PGPoolingDataSource.getConnection(PGPoolingDataSource.java:309)
    at org.jboss.jca.adapters.jdbc.local.LocalManagedConnectionFactory.createLocalManagedConnection(LocalManagedConnectionFactory.java:312)
    ... 43 more
Caused by: java.net.ConnectException: Connection refused (Connection refused)
    at java.net.PlainSocketImpl.socketConnect(Native Method)
    at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
    at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
    at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
    at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
    at java.net.Socket.connect(Socket.java:589)
    at org.postgresql.core.PGStream.<init>(PGStream.java:61)
    at org.postgresql.core.v3.ConnectionFactoryImpl.openConnectionImpl(ConnectionFactoryImpl.java:144)
    ... 52 more

I've verified that I can connect to postgres using psql

# psql -h {REMOTE_IP} keycloak keycloak
psql (9.5.7)
SSL connection (protocol: TLSv1.2, cipher: ECDHE-RSA-AES256-GCM-SHA384, 
bits: 256, compression: off)
Type "help" for help.

keycloak=>

Answer 1

I managed to figure this out for my case. The JDBC driver for postgres was configured to use a PGPoolingDataSource and had a datasource-class defined.

<driver name="postgresql" module="org.postgresql">
    <xa-datasource-class>org.postgresql.xa.PGXADataSource</xa-datasource-class>
    <datasource-class>org.postgresql.ds.PGPoolingDataSource</datasource-class>
</driver>

When the datasource-class is defined, the connection url must be passed through a connection-property instead of connection-url. I updated my configuration and the server booted up fine.

<datasource jndi-name="java:jboss/datasources/KeycloakDS" pool-name="KeycloakDS" enabled="true" use-java-context="true">
    <connection-url>jdbc:postgresql://{REMOTE_IP}:5432/keycloak</connection-url>
    <connection-property name="url">jdbc:postgresql://{REMOTE_IP}:5432/keycloak</connection-property>
    <driver>postgresql</driver>
    <pool>
        <max-pool-size>20</max-pool-size>
    </pool>
    <driver-class>org.postgresql.Driver</driver-class>
    <security>
        <user-name>keycloak</user-name>
        <password>{PASSWORD}</password>
    </security>
</datasource>

This issue is noted in the wildfly issue tracker https://issues.jboss.org/browse/WFLY-6157