Docker run - MySQL Springboot Connection refused

Question

i'm new to Docker and have been trying to Dockerize a simple springboot and MySQL project.

I have created an image for spring boot and also have a container for my springboot project and a separate container for MySQL.

When I attempt to log the container logs for the MySQL part it works with no errors.

docker container logs mysql-standalone

2021-12-20T18:27:56.109823Z 0 [System] [MY-013602] [Server] Channel mysql_main configured to support TLS. Encrypted connections are now supported for this channel.
2021-12-20T18:27:56.184989Z 0 [Warning] [MY-011810] [Server] Insecure configuration for --pid-file: Location '/var/run/mysqld' in the path is accessible to all OS users. Consider choosing a different directory.
2021-12-20T18:27:56.375549Z 0 [System] [MY-011323] [Server] X Plugin ready for connections. Bind-address: '::' port: 33060, socket: /var/run/mysqld/mysqlx.sock
2021-12-20T18:27:56.376015Z 0 [System] [MY-010931] [Server] /usr/sbin/mysqld: ready for connections. Version: '8.0.27'  socket: '/var/run/mysqld/mysqld.sock'  port: 3306  MySQL Community Server - GPL.

But, when I try to log for the Springboot project I get an error

**docker container logs springboot-docker **

com.mysql.cj.jdbc.exceptions.CommunicationsException: Communications link failure

The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.
    at com.mysql.cj.jdbc.exceptions.SQLError.createCommunicationsException(SQLError.java:174) ~[mysql-connector-java-8.0.27.jar!/:8.0.27]
    at com.mysql.cj.jdbc.exceptions.SQLExceptionsMapping.translateException(SQLExceptionsMapping.java:64) ~[mysql-connector-java-8.0.27.jar!/:8.0.27]
    at com.mysql.cj.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:828) ~[mysql-connector-java-8.0.27.jar!/:8.0.27]
    at com.mysql.cj.jdbc.ConnectionImpl.(ConnectionImpl.java:448) ~[mysql-connector-java-8.0.27.jar!/:8.0.27]
    at com.mysql.cj.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:241) ~[mysql-connector-java-8.0.27.jar!/:8.0.27]
    at com.mysql.cj.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:198) ~[mysql-connector-java-8.0.27.jar!/:8.0.27]
    at com.zaxxer.hikari.util.DriverDataSource.getConnection(DriverDataSource.java:138) ~[HikariCP-4.0.3.jar!/:na]
    at com.zaxxer.hikari.pool.PoolBase.newConnection(PoolBase.java:364) ~[HikariCP-4.0.3.jar!/:na]
    at com.zaxxer.hikari.pool.PoolBase.newPoolEntry(PoolBase.java:206) ~[HikariCP-4.0.3.jar!/:na]
    at com.zaxxer.hikari.pool.HikariPool.createPoolEntry(HikariPool.java:476) ~[HikariCP-4.0.3.jar!/:na]
    at com.zaxxer.hikari.pool.HikariPool.checkFailFast(HikariPool.java:561) ~[HikariCP-4.0.3.jar!/:na]
    at com.zaxxer.hikari.pool.HikariPool.(HikariPool.java:115) ~[HikariCP-4.0.3.jar!/:na]
    at com.zaxxer.hikari.HikariDataSource.getConnection(HikariDataSource.java:112) ~[HikariCP-4.0.3.jar!/:na]
    at org.hibernate.engine.jdbc.connections.internal.DatasourceConnectionProviderImpl.getConnection(DatasourceConnectionProviderImpl.java:122) ~[hibernate-core-5.6.1.Final.jar!/:5.6.1.Final]

My current containers

When I attempt to run the project locally with an IDE it works perfectly, the endpoints work fine with no errors.

I'm not too sure where the problem lies, if anyone has some ideas please let me know.

New Error

java.sql.SQLNonTransientConnectionException: Public Key Retrieval is not allowed
    at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:110) ~[mysql-connector-java-8.0.27.jar!/:8.0.27]
    at com.mysql.cj.jdbc.exceptions.SQLExceptionsMapping.translateException(SQLExceptionsMapping.java:122) ~[mysql-connector-java-8.0.27.jar!/:8.0.27]
    at com.mysql.cj.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:828) ~[mysql-connector-java-8.0.27.jar!/:8.0.27]
    at com.mysql.cj.jdbc.ConnectionImpl.(ConnectionImpl.java:448) ~[mysql-connector-java-8.0.27.jar!/:8.0.27]
    at com.mysql.cj.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:241) ~[mysql-connector-java-8.0.27.jar!/:8.0.27]
    at com.mysql.cj.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:198) ~[mysql-connector-java-8.0.27.jar!/:8.0.27]
    at com.zaxxer.hikari.util.DriverDataSource.getConnection(DriverDataSource.java:138) ~[HikariCP-4.0.3.jar!/:na]
    at com.zaxxer.hikari.pool.PoolBase.newConnection(PoolBase.java:364) ~[HikariCP-4.0.3.jar!/:na]
    at com.zaxxer.hikari.pool.PoolBase.newPoolEntry(PoolBase.java:206) ~[HikariCP-4.0.3.jar!/:na]
    at com.zaxxer.hikari.pool.HikariPool.createPoolEntry(HikariPool.java:476) ~[HikariCP-4.0.3.jar!/:na]
    at com.zaxxer.hikari.pool.HikariPool.checkFailFast(HikariPool.java:561) ~[HikariCP-4.0.3.jar!/:na]
    at com.zaxxer.hikari.pool.HikariPool.(HikariPool.java:115) ~[HikariCP-4.0.3.jar!/:na]
    at com.zaxxer.hikari.HikariDataSource.getConnection(HikariDataSource.java:112) ~[HikariCP-4.0.3.jar!/:na]

application.properties (Database config)

spring.datasource.url=jdbc:mysql://mysql-standalone:3306/docker_demo?useSSL=false
spring.datasource.username=root
spring.datasource.password=password
spring.jpa.properties.hibernate.dialect= org.hibernate.dialect.MySQL5InnoDBDialect

user_11669366 · Answer

Update 01: Updated cmd, written here for code block

docker run --name mysql-standalone -p 3306:3306 -e MYSQL_ROOT_PASSWORD=password -e MYSQL_DATABASE=docker-demo -e MYSQL_USER=demo -e MYSQL_PASSWORD=password -d mysql:8.0.27

Short answer: you need to run the docker container with the port specified like so:

docker run -it -p 3306:3306 mysql

Then you should be able to connect :) If you share your docker file or docker-compose, i will be happy to assist with the command.

Longer answer is that you need to bind the container port to your host machines network in order for non-dockerized services to be able to access the port on the container. This is very usefull when having to run multiple mysql containers on the same machine, then you just bind to a different host port and everything should be good to go :)

Docker run - MySQL Springboot Connection refused

1 Answers