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Using Kubernetes Secret for PostgreSQL ENV causes application pod CRASH

I have problem with injecting Kubernetes Secret's value into Pod env.
I have following pg-secrets.yml:
apiVersion: v1
kind: Secret
metadata:
name: pg-secrets
type: Opaque
data:
POSTGRES_USER: cG9zdGdyZXMK
POSTGRES_PASSWORD: cGFzc3dvcmQK
# postgres & password
And then I inject POSTGRES_PASSWORD from it to application-deployment.yml ENV:
apiVersion: apps/v1
kind: Deployment
...
spec:
containers:
- name: realo
image: abialiauski/realo
imagePullPolicy: Always
ports:
- containerPort: 8080
env:
- name: PG_USERNAME
valueFrom:
configMapKeyRef:
name: realo-configmap
key: PG_USERNAME
- name: PG_PASSWORD
valueFrom:
secretKeyRef:
name: pg-secrets
key: POSTGRES_PASSWORD
- name: PG_HOST
value: postgres
And having this application.yml:
spring:
application:
name: realo
datasource:
username: ${PG_USERNAME}
password: ${PG_PASSWORD}
url: jdbc:postgresql://${PG_HOST}:5432/postgres
driver-class-name: org.postgresql.Driver
So, after starting PostgreSQL, the backend application crashes refusing the database connection with this exception:
Caused by: org.postgresql.util.PSQLException: Something unusual has occurred to cause the driver to fail. Please report this exception.
at org.postgresql.Driver.connect(Driver.java:282) ~[postgresql-42.3.8.jar:42.3.8]
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.<init>(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 liquibase.integration.spring.SpringLiquibase.afterPropertiesSet(SpringLiquibase.java:266) ~[liquibase-core-4.9.1.jar:na]
... 180 common frames omitted
Caused by: java.lang.IllegalArgumentException: Prohibited character
at org.postgresql.shaded.com.ongres.saslprep.SaslPrep.saslPrep(SaslPrep.java:105) ~[postgresql-42.3.8.jar:42.3.8]
at org.postgresql.shaded.com.ongres.scram.common.stringprep.StringPreparations$2.doNormalize(StringPreparations.java:55) ~[postgresql-42.3.8.jar:42.3.8]
at org.postgresql.shaded.com.ongres.scram.common.stringprep.StringPreparations.normalize(StringPreparations.java:65) ~[postgresql-42.3.8.jar:42.3.8]
at org.postgresql.shaded.com.ongres.scram.common.ScramMechanisms.saltedPassword(ScramMechanisms.java:152) ~[postgresql-42.3.8.jar:42.3.8]
at org.postgresql.shaded.com.ongres.scram.common.ScramFunctions.saltedPassword(ScramFunctions.java:59) ~[postgresql-42.3.8.jar:42.3.8]
at org.postgresql.shaded.com.ongres.scram.client.ScramSession$ClientFinalProcessor.<init>(ScramSession.java:196) ~[postgresql-42.3.8.jar:42.3.8]
at org.postgresql.shaded.com.ongres.scram.client.ScramSession$ClientFinalProcessor.<init>(ScramSession.java:163) ~[postgresql-42.3.8.jar:42.3.8]
at org.postgresql.shaded.com.ongres.scram.client.ScramSession$ServerFirstProcessor.clientFinalProcessor(ScramSession.java:130) ~[postgresql-42.3.8.jar:42.3.8]
at org.postgresql.jre7.sasl.ScramAuthenticator.processServerFirstMessage(ScramAuthenticator.java:147) ~[postgresql-42.3.8.jar:42.3.8]
at org.postgresql.core.v3.ConnectionFactoryImpl.doAuthentication(ConnectionFactoryImpl.java:816) ~[postgresql-42.3.8.jar:42.3.8]
at org.postgresql.core.v3.ConnectionFactoryImpl.tryConnect(ConnectionFactoryImpl.java:180) ~[postgresql-42.3.8.jar:42.3.8]
at org.postgresql.core.v3.ConnectionFactoryImpl.openConnectionImpl(ConnectionFactoryImpl.java:235) ~[postgresql-42.3.8.jar:42.3.8]
at org.postgresql.core.ConnectionFactory.openConnection(ConnectionFactory.java:49) ~[postgresql-42.3.8.jar:42.3.8]
at org.postgresql.jdbc.PgConnection.<init>(PgConnection.java:223) ~[postgresql-42.3.8.jar:42.3.8]
at org.postgresql.Driver.makeConnection(Driver.java:402) ~[postgresql-42.3.8.jar:42.3.8]
at org.postgresql.Driver.connect(Driver.java:261) ~[postgresql-42.3.8.jar:42.3.8]
... 188 common frames omitted
If I inspect ENV everything will be OK, but backend still fails.
kubectl exec -i -t pod/realo-66856b59b4-bp27r -- /bin/sh -c 'echo "username: $PG_USERNAME\npassword: $PG_PASSWORD\n"'
output:
username: postgres\npassword: password

You used
$ echo postgres | base64
cG9zdGdyZXMK
to generate your base64 encoded secret.
The problem with that is echo adds a linefeed to its output, you should call it like this:
$ echo -n postgres | base64
cG9zdGdyZXM=
You need to do the same with password too:
$ echo -n password | base64
cGFzc3dvcmQ=

java.sql.SQLRecoverableException: IO Error: Unknown Authentication, Encryption or Data Integrity algorithm

I have a spring boot application that uses java 11, oracle 19c, and ojdbc8:19.8.0.0. The app is deployed on cloud(konvoy). I got an exception (attached below) when the application starts. I google "java.sql.SQLRecoverableException: IO Error: Unknown Authentication, Encryption or Data Integrity algorithm" but doesn't get useful information. Did anyone experience the same issue before?
Below are portion of pom.xml and exception. The driver class is oracle.jdbc.oracleDriver
<dependency>
<groupId>com.oracle.database.jdbc</groupId>
<artifactId>ojdbc8</artifactId>
<version>19.8.0.0</version>
</dependency>
2022-12-02:15:39:33:687 [http-nio-8080-exec-2] DEBUG o.s.jdbc.datasource.DataSourceUtils[116] - Fetching JDBC Connection from DataSource
2022-12-02:15:39:33:693 [http-nio-8080-exec-2] INFO com.zaxxer.hikari.HikariDataSource[110] - HikariPool-1 - Starting...
2022-12-02:15:39:35:357 [http-nio-8080-exec-2] ERROR com.zaxxer.hikari.pool.HikariPool[594] - HikariPool-1 - Exception during pool initialization.
java.sql.SQLRecoverableException: IO Error: Unknown Authentication, Encryption or Data Integrity algorithm
at oracle.jdbc.driver.T4CConnection.logon(T4CConnection.java:458)
at oracle.jdbc.driver.PhysicalConnection.<init>(PhysicalConnection.java:546)
at oracle.jdbc.driver.T4CConnection.<init>(T4CConnection.java:236)
at oracle.jdbc.driver.T4CDriverExtension.getConnection(T4CDriverExtension.java:32)
at oracle.jdbc.driver.OracleDriver.connect(OracleDriver.java:521)
at com.zaxxer.hikari.util.DriverDataSource.getConnection(DriverDataSource.java:138)
at com.zaxxer.hikari.pool.PoolBase.newConnection(PoolBase.java:364)
at com.zaxxer.hikari.pool.PoolBase.newPoolEntry(PoolBase.java:206)
at com.zaxxer.hikari.pool.HikariPool.createPoolEntry(HikariPool.java:476)
at com.zaxxer.hikari.pool.HikariPool.checkFailFast(HikariPool.java:561)
at com.zaxxer.hikari.pool.HikariPool.<init>(HikariPool.java:115)
at com.zaxxer.hikari.HikariDataSource.getConnection(HikariDataSource.java:112)
at org.springframework.jdbc.datasource.DataSourceUtils.fetchConnection(DataSourceUtils.java:159)
at org.springframework.jdbc.datasource.DataSourceUtils.doGetConnection(DataSourceUtils.java:117)
at org.springframework.jdbc.datasource.DataSourceUtils.getConnection(DataSourceUtils.java:80)
at org.springframework.jdbc.core.JdbcTemplate.execute(JdbcTemplate.java:376)
at org.springframework.jdbc.core.JdbcTemplate.query(JdbcTemplate.java:465)
at org.springframework.jdbc.core.JdbcTemplate.query(JdbcTemplate.java:475)
at pax.tded.i94.util.HealthCheck.checkDbConnection(HealthCheck.java:69)
at pax.tded.i94.util.HealthCheck.health(HealthCheck.java:48)
at org.springframework.boot.actuate.health.HealthIndicator.getHealth(HealthIndicator.java:37)
at org.springframework.boot.actuate.health.HealthEndpointWebExtension.getHealth(HealthEndpointWebExtension.java:104)
at org.springframework.boot.actuate.health.HealthEndpointWebExtension.getHealth(HealthEndpointWebExtension.java:46)
at org.springframework.boot.actuate.health.HealthEndpointSupport.getLoggedHealth(HealthEndpointSupport.java:172)
at org.springframework.boot.actuate.health.HealthEndpointSupport.getContribution(HealthEndpointSupport.java:145)
at org.springframework.boot.actuate.health.HealthEndpointSupport.getAggregateContribution(HealthEndpointSupport.java:156)
at org.springframework.boot.actuate.health.HealthEndpointSupport.getContribution(HealthEndpointSupport.java:141)
at org.springframework.boot.actuate.health.HealthEndpointSupport.getHealth(HealthEndpointSupport.java:110)
at org.springframework.boot.actuate.health.HealthEndpointSupport.getHealth(HealthEndpointSupport.java:81)
at org.springframework.boot.actuate.health.HealthEndpointWebExtension.health(HealthEndpointWebExtension.java:90)
at org.springframework.boot.actuate.health.HealthEndpointWebExtension.health(HealthEndpointWebExtension.java:79)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:566)
at org.springframework.util.ReflectionUtils.invokeMethod(ReflectionUtils.java:282)
at org.springframework.boot.actuate.endpoint.invoke.reflect.ReflectiveOperationInvoker.invoke(ReflectiveOperationInvoker.java:74)
at org.springframework.boot.actuate.endpoint.annotation.AbstractDiscoveredOperation.invoke(AbstractDiscoveredOperation.java:60)
at org.springframework.boot.actuate.endpoint.web.servlet.AbstractWebMvcEndpointHandlerMapping$ServletWebOperationAdapter.handle

Initialize schema and domain on JDBC H2 Connection String

I want to initialize both schema and domain for my in-memory h2 database for running Junit test cases but I face the below error. Is there a proper syntax to initialize both schema and domain on init?
Caused by: org.hibernate.exception.SQLGrammarException: Unable to open JDBC Connection for DDL execution
at org.hibernate.exception.internal.SQLExceptionTypeDelegate.convert(SQLExceptionTypeDelegate.java:63)
at org.hibernate.exception.internal.StandardSQLExceptionConverter.convert(StandardSQLExceptionConverter.java:42)
at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:113)
at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:99)
at org.hibernate.resource.transaction.backend.jdbc.internal.DdlTransactionIsolatorNonJtaImpl.getIsolatedConnection(DdlTransactionIsolatorNonJtaImpl.java:69)
at org.hibernate.tool.schema.internal.exec.ImprovedExtractionContextImpl.getJdbcConnection(ImprovedExtractionContextImpl.java:60)
at org.hibernate.tool.schema.extract.internal.SequenceInformationExtractorLegacyImpl.extractMetadata(SequenceInformationExtractorLegacyImpl.java:40)
at org.hibernate.tool.schema.extract.internal.DatabaseInformationImpl.initializeSequences(DatabaseInformationImpl.java:65)
at org.hibernate.tool.schema.extract.internal.DatabaseInformationImpl.<init>(DatabaseInformationImpl.java:59)
at org.hibernate.tool.schema.internal.Helper.buildDatabaseInformation(Helper.java:155)
at org.hibernate.tool.schema.internal.AbstractSchemaMigrator.doMigration(AbstractSchemaMigrator.java:96)
at org.hibernate.tool.schema.spi.SchemaManagementToolCoordinator.performDatabaseAction(SchemaManagementToolCoordinator.java:184)
at org.hibernate.tool.schema.spi.SchemaManagementToolCoordinator.process(SchemaManagementToolCoordinator.java:73)
at org.hibernate.internal.SessionFactoryImpl.<init>(SessionFactoryImpl.java:320)
at org.hibernate.boot.internal.SessionFactoryBuilderImpl.build(SessionFactoryBuilderImpl.java:462)
at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.build(EntityManagerFactoryBuilderImpl.java:935)
at org.springframework.orm.jpa.vendor.SpringHibernateJpaPersistenceProvider.createContainerEntityManagerFactory(SpringHibernateJpaPersistenceProvider.java:58)
at org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean.createNativeEntityManagerFactory(LocalContainerEntityManagerFactoryBean.java:365)
at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.buildNativeEntityManagerFactory(AbstractEntityManagerFactoryBean.java:391)
... 64 common frames omitted
Caused by: org.h2.jdbc.JdbcSQLSyntaxErrorException: Syntax error in SQL statement "CREATE SCHEMA IF NOT EXISTS INVENTORY CREATE[*] DOMAIN IF NOT EXISTS JSON AS TEXT"; SQL statement:
CREATE SCHEMA IF NOT EXISTS inventory create domain if not exists json as text [42000-200]
at org.h2.message.DbException.getJdbcSQLException(DbException.java:453)
at org.h2.message.DbException.getJdbcSQLException(DbException.java:429)
at org.h2.message.DbException.get(DbException.java:205)
at org.h2.message.DbException.get(DbException.java:181)
at org.h2.message.DbException.getSyntaxError(DbException.java:229)
at org.h2.command.Parser.getSyntaxError(Parser.java:1051)
at org.h2.command.Parser.prepareCommand(Parser.java:741)
at org.h2.engine.Session.prepareLocal(Session.java:657)
at org.h2.engine.Session.prepareCommand(Session.java:595)
at org.h2.engine.Engine.openSession(Engine.java:241)
at org.h2.engine.Engine.createSessionAndValidate(Engine.java:171)
at org.h2.engine.Engine.createSession(Engine.java:166)
at org.h2.engine.Engine.createSession(Engine.java:29)
at org.h2.engine.SessionRemote.connectEmbeddedOrServer(SessionRemote.java:340)
at org.h2.jdbc.JdbcConnection.<init>(JdbcConnection.java:173)
at org.h2.jdbc.JdbcConnection.<init>(JdbcConnection.java:152)
at org.h2.Driver.connect(Driver.java:69)
at com.zaxxer.hikari.util.DriverDataSource.getConnection(DriverDataSource.java:138)
at com.zaxxer.hikari.pool.PoolBase.newConnection(PoolBase.java:353)
at com.zaxxer.hikari.pool.PoolBase.newPoolEntry(PoolBase.java:201)
at com.zaxxer.hikari.pool.HikariPool.createPoolEntry(HikariPool.java:473)
at com.zaxxer.hikari.pool.HikariPool.checkFailFast(HikariPool.java:562)
at com.zaxxer.hikari.pool.HikariPool.<init>(HikariPool.java:115)
at com.zaxxer.hikari.HikariDataSource.getConnection(HikariDataSource.java:112)
at org.hibernate.engine.jdbc.connections.internal.DatasourceConnectionProviderImpl.getConnection(DatasourceConnectionProviderImpl.java:122)
at org.hibernate.engine.jdbc.env.internal.JdbcEnvironmentInitiator$ConnectionProviderJdbcConnectionAccess.obtainConnection(JdbcEnvironmentInitiator.java:180)
at org.hibernate.resource.transaction.backend.jdbc.internal.DdlTransactionIsolatorNonJtaImpl.getIsolatedConnection(DdlTransactionIsolatorNonJtaImpl.java:43)
... 78 common frames omitted
My property file for in-memory h2 database is below.
spring.datasource.url=jdbc:h2:mem:testdb;INIT=CREATE SCHEMA IF NOT EXISTS inventory create domain if not exists json as text;MODE=PostgreSQL;
spring.datasource.username=sa
spring.datasource.password=
spring.datasource.driver-class-name=org.h2.Driver

You are using 2 SQL statements without separator ...
According to http://www.h2database.com/html/features.html#execute_sql_on_connection you may use '\;':
spring.datasource.url=jdbc:h2:mem:testdb;INIT=CREATE SCHEMA IF NOT EXISTS inventory\\; CREATE DOMAIN IF NOT EXISTS JSON AS TEXT;MODE=PostgreSQL;

Docker run - MySQL Springboot Connection refused

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.<init>(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.<init>(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.<init>(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.<init>(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

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 :)

Akka remoting- Cann't assign requested address

I am trying an example of Akka-Remoting. Every time I start my remote actor system I get this exception
[INFO] [11/25/2013 18:50:19.811] [main] [Remoting] Starting remoting
Exception in thread "main" org.jboss.netty.channel.ChannelException: Failed to bind to: /10.147.137.44:2555
at org.jboss.netty.bootstrap.ServerBootstrap.bind(ServerBootstrap.java:272)
at akka.remote.transport.netty.NettyTransport$$anonfun$listen$1.apply(NettyTransport.scala:391)
at akka.remote.transport.netty.NettyTransport$$anonfun$listen$1.apply(NettyTransport.scala:388)
at scala.util.Success$$anonfun$map$1.apply(Try.scala:206)
at scala.util.Try$.apply(Try.scala:161)
at scala.util.Success.map(Try.scala:206)
at scala.concurrent.Future$$anonfun$map$1.apply(Future.scala:235)
at scala.concurrent.Future$$anonfun$map$1.apply(Future.scala:235)
at scala.concurrent.impl.CallbackRunnable.run(Promise.scala:32)
at akka.dispatch.BatchingExecutor$Batch$$anonfun$run$1.processBatch$1(BatchingExecutor.scala:67)
at akka.dispatch.BatchingExecutor$Batch$$anonfun$run$1.apply$mcV$sp(BatchingExecutor.scala:82)
at akka.dispatch.BatchingExecutor$Batch$$anonfun$run$1.apply(BatchingExecutor.scala:59)
at akka.dispatch.BatchingExecutor$Batch$$anonfun$run$1.apply(BatchingExecutor.scala:59)
at scala.concurrent.BlockContext$.withBlockContext(BlockContext.scala:72)
at akka.dispatch.BatchingExecutor$Batch.run(BatchingExecutor.scala:58)
at akka.dispatch.TaskInvocation.run(AbstractDispatcher.scala:42)
at akka.dispatch.ForkJoinExecutorConfigurator$AkkaForkJoinTask.exec(AbstractDispatcher.scala:386)
at scala.concurrent.forkjoin.ForkJoinTask.doExec(ForkJoinTask.java:260)
at scala.concurrent.forkjoin.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1339)
at scala.concurrent.forkjoin.ForkJoinPool.runWorker(ForkJoinPool.java:1979)
at scala.concurrent.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:107)
Caused by: java.net.BindException: Cannot assign requested address
at sun.nio.ch.Net.bind0(Native Method)
at sun.nio.ch.Net.bind(Net.java:444)
at sun.nio.ch.Net.bind(Net.java:436)
at sun.nio.ch.ServerSocketChannelImpl.bind(ServerSocketChannelImpl.java:214)
at sun.nio.ch.ServerSocketAdaptor.bind(ServerSocketAdaptor.java:74)
at org.jboss.netty.channel.socket.nio.NioServerBoss$RegisterTask.run(NioServerBoss.java:193)
at org.jboss.netty.channel.socket.nio.AbstractNioSelector.processTaskQueue(AbstractNioSelector.java:366)
at org.jboss.netty.channel.socket.nio.AbstractNioSelector.run(AbstractNioSelector.java:290)
at org.jboss.netty.channel.socket.nio.NioServerBoss.run(NioServerBoss.java:42)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:744)
Here is my application.conf details
remoteCalculator{
akka {
actor {
provider = "akka.remote.RemoteActorRefProvider"
}
remote {
transport = "akka.remote.netty.NettyRemoteTransport"
log-received-messages = on
log-sent-messages = on
log-remote-lifecycle-events = on
enabled-transports = ["akka.remote.netty.tcp"]
netty.tcp {
hostname = "10.147.137.44"
port = 2555
log-received-messages = on
log-sent-messages = on
log-remote-lifecycle-events = on
}
}
}
}
I tried finding the possibility of another application listening to the port 2555 by executing following command
sudo netstat -anp | grep 2555
But it doesn't gives anything. Please help me find out the reason why the application is not able to bind on the configured address.

I got the root cause of the problem. Actually it was not a configuration/proramming issue. I am working on a virtual host (Ubuntu) inside my window OS and I had not enabled the network bridge. So, the virtual host was not able to identify the hostName. After enabling the network bridge, the issue got solved.