Exception when running in docker: org.postgresql.util.PSQLException: FATAL: password authentication failed for user "hamzabelmellouki" - postgresql

Question

I am pretty new to docker. I have a spring-boot application that connects to postgres database (running in a container). I want to dockerize my spring-boot application and be able to connect it to the postgres database container.
What works:
Running the application without using docker works just fine: java -jar product-manager-0.0.1-SNAPSHOT.jar
What doesn't work:
Dockerizing and Running the application with Docker gives me an exception.
Note that I am not using docker-compose here.
My app Dockerfile:
FROM openjdk:11
ARG JAR_FILE=target/*.jar
COPY ${JAR_FILE} app.jar
ENTRYPOINT ["java","-jar","/app.jar"]
Steps I've taken to run the app:
Run and start up the postgres database in a container using these commands:
docker run --rm --name lil-postgres -e POSTGRES_PASSWORD=password -d -v $HOME/srv/postgres:/var/lib/postgresql/data -p 5432:5432 postgres
postgres -D /usr/local/var/postgres
I've built the app's image:
docker build -t ensa/product-manager .
This is the result from running the latest command:
Sending build context to Docker daemon 38.01MB
Step 1/4 : FROM openjdk:11
---> 612d4d483eee
Step 2/4 : ARG JAR_FILE=target/*.jar
---> Running in 1b8674e959ca
Removing intermediate container 1b8674e959ca
---> d2c2b90680de
Step 3/4 : COPY ${JAR_FILE} app.jar
---> 01295beecd1b
Step 4/4 : ENTRYPOINT ["java","-jar","/app.jar"]
---> Running in 31230e7ff323
Removing intermediate container 31230e7ff323
---> c4487683e7b1
Successfully built c4487683e7b1
Successfully tagged ensa/product-manager:latest
Finally, I've created a running container using:
docker run --net="host" -it ensa/product-manager
The third step resulted in an exception:
org.postgresql.util.PSQLException: FATAL: password authentication failed for user "hamzabelmellouki"
at org.postgresql.core.v3.ConnectionFactoryImpl.doAuthentication(ConnectionFactoryImpl.java:520) ~[postgresql-42.2.8.jar!/:42.2.8]
at org.postgresql.core.v3.ConnectionFactoryImpl.tryConnect(ConnectionFactoryImpl.java:141) ~[postgresql-42.2.8.jar!/:42.2.8]
at org.postgresql.core.v3.ConnectionFactoryImpl.openConnectionImpl(ConnectionFactoryImpl.java:192) ~[postgresql-42.2.8.jar!/:42.2.8]
at org.postgresql.core.ConnectionFactory.openConnection(ConnectionFactory.java:49) ~[postgresql-42.2.8.jar!/:42.2.8]
at org.postgresql.jdbc.PgConnection.<init>(PgConnection.java:195) ~[postgresql-42.2.8.jar!/:42.2.8]
at org.postgresql.Driver.makeConnection(Driver.java:458) ~[postgresql-42.2.8.jar!/:42.2.8]
at org.postgresql.Driver.connect(Driver.java:260) ~[postgresql-42.2.8.jar!/:42.2.8]
at com.zaxxer.hikari.util.DriverDataSource.getConnection(DriverDataSource.java:138) ~[HikariCP-3.4.1.jar!/:na]
at com.zaxxer.hikari.pool.PoolBase.newConnection(PoolBase.java:353) ~[HikariCP-3.4.1.jar!/:na]
at com.zaxxer.hikari.pool.PoolBase.newPoolEntry(PoolBase.java:201) ~[HikariCP-3.4.1.jar!/:na]
at com.zaxxer.hikari.pool.HikariPool.createPoolEntry(HikariPool.java:473) ~[HikariCP-3.4.1.jar!/:na]
at com.zaxxer.hikari.pool.HikariPool.checkFailFast(HikariPool.java:562) ~[HikariCP-3.4.1.jar!/:na]
at com.zaxxer.hikari.pool.HikariPool.<init>(HikariPool.java:115) ~[HikariCP-3.4.1.jar!/:na]
at com.zaxxer.hikari.HikariDataSource.getConnection(HikariDataSource.java:112) ~[HikariCP-3.4.1.jar!/:na]
at org.springframework.jdbc.datasource.DataSourceUtils.fetchConnection(DataSourceUtils.java:158) ~[spring-jdbc-5.2.1.RELEASE.jar!/:5.2.1.RELEASE]
at org.springframework.jdbc.datasource.DataSourceUtils.doGetConnection(DataSourceUtils.java:116) ~[spring-jdbc-5.2.1.RELEASE.jar!/:5.2.1.RELEASE]
at org.springframework.jdbc.datasource.DataSourceUtils.getConnection(DataSourceUtils.java:79) ~[spring-jdbc-5.2.1.RELEASE.jar!/:5.2.1.RELEASE]
at org.springframework.jdbc.core.JdbcTemplate.execute(JdbcTemplate.java:324) ~[spring-jdbc-5.2.1.RELEASE.jar!/:5.2.1.RELEASE]
at org.springframework.boot.jdbc.EmbeddedDatabaseConnection.isEmbedded(EmbeddedDatabaseConnection.java:120) ~[spring-boot-2.2.1.RELEASE.jar!/:2.2.1.RELEASE]
at org.springframework.boot.autoconfigure.orm.jpa.HibernateDefaultDdlAutoProvider.getDefaultDdlAuto(HibernateDefaultDdlAutoProvider.java:42) ~[spring-boot-autoconfigure-2.2.1.RELEASE.jar!/:2.2.1.RELEASE]
at org.springframework.boot.autoconfigure.orm.jpa.HibernateJpaConfiguration.lambda$getVendorProperties$1(HibernateJpaConfiguration.java:130) ~[spring-boot-autoconfigure-2.2.1.RELEASE.jar!/:2.2.1.RELEASE]
at org.springframework.boot.autoconfigure.orm.jpa.HibernateSettings.getDdlAuto(HibernateSettings.java:41) ~[spring-boot-autoconfigure-2.2.1.RELEASE.jar!/:2.2.1.RELEASE]
at org.springframework.boot.autoconfigure.orm.jpa.HibernateProperties.determineDdlAuto(HibernateProperties.java:136) ~[spring-boot-autoconfigure-2.2.1.RELEASE.jar!/:2.2.1.RELEASE]
at org.springframework.boot.autoconfigure.orm.jpa.HibernateProperties.getAdditionalProperties(HibernateProperties.java:102) ~[spring-boot-autoconfigure-2.2.1.RELEASE.jar!/:2.2.1.RELEASE]
at org.springframework.boot.autoconfigure.orm.jpa.HibernateProperties.determineHibernateProperties(HibernateProperties.java:94) ~[spring-boot-autoconfigure-2.2.1.RELEASE.jar!/:2.2.1.RELEASE]
at org.springframework.boot.autoconfigure.orm.jpa.HibernateJpaConfiguration.getVendorProperties(HibernateJpaConfiguration.java:132) ~[spring-boot-autoconfigure-2.2.1.RELEASE.jar!/:2.2.1.RELEASE]
at org.springframework.boot.autoconfigure.orm.jpa.JpaBaseConfiguration.entityManagerFactory(JpaBaseConfiguration.java:133) ~[spring-boot-autoconfigure-2.2.1.RELEASE.jar!/:2.2.1.RELEASE]
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:na]
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:na]
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:na]
at java.base/java.lang.reflect.Method.invoke(Method.java:566) ~[na:na]
at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:154) ~[spring-beans-5.2.1.RELEASE.jar!/:5.2.1.RELEASE]
at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:640) ~[spring-beans-5.2.1.RELEASE.jar!/:5.2.1.RELEASE]
at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:625) ~[spring-beans-5.2.1.RELEASE.jar!/:5.2.1.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1338) ~[spring-beans-5.2.1.RELEASE.jar!/:5.2.1.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1177) ~[spring-beans-5.2.1.RELEASE.jar!/:5.2.1.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:557) ~[spring-beans-5.2.1.RELEASE.jar!/:5.2.1.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:517) ~[spring-beans-5.2.1.RELEASE.jar!/:5.2.1.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:323) ~[spring-beans-5.2.1.RELEASE.jar!/:5.2.1.RELEASE]
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222) ~[spring-beans-5.2.1.RELEASE.jar!/:5.2.1.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:321) ~[spring-beans-5.2.1.RELEASE.jar!/:5.2.1.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202) ~[spring-beans-5.2.1.RELEASE.jar!/:5.2.1.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:1108) ~[spring-context-5.2.1.RELEASE.jar!/:5.2.1.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:868) ~[spring-context-5.2.1.RELEASE.jar!/:5.2.1.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:550) ~[spring-context-5.2.1.RELEASE.jar!/:5.2.1.RELEASE]
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:141) ~[spring-boot-2.2.1.RELEASE.jar!/:2.2.1.RELEASE]
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:747) ~[spring-boot-2.2.1.RELEASE.jar!/:2.2.1.RELEASE]
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397) ~[spring-boot-2.2.1.RELEASE.jar!/:2.2.1.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:315) ~[spring-boot-2.2.1.RELEASE.jar!/:2.2.1.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1226) ~[spring-boot-2.2.1.RELEASE.jar!/:2.2.1.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1215) ~[spring-boot-2.2.1.RELEASE.jar!/:2.2.1.RELEASE]
at com.ensa.productmanager.ProductManagerApplication.main(ProductManagerApplication.java:10) ~[classes!/:0.0.1-SNAPSHOT]
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:na]
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:na]
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:na]
at java.base/java.lang.reflect.Method.invoke(Method.java:566) ~[na:na]
at org.springframework.boot.loader.MainMethodRunner.run(MainMethodRunner.java:48) ~[app.jar:0.0.1-SNAPSHOT]
at org.springframework.boot.loader.Launcher.launch(Launcher.java:87) ~[app.jar:0.0.1-SNAPSHOT]
at org.springframework.boot.loader.Launcher.launch(Launcher.java:51) ~[app.jar:0.0.1-SNAPSHOT]
at org.springframework.boot.loader.JarLauncher.main(JarLauncher.java:52) ~[app.jar:0.0.1-SNAPSHOT]
I've spent the whole day debugging and reading threads about this error. But I couldn't find a clue. Any help will be much appreciated.
UPDATE
I've run docker inspect on the Postgres container:
[
{
"Id": "426744f8c0a90b504c4d7c22242929f4b7f833e3ff4ddb9a112139d18ffd7c10",
"Created": "2020-01-16T19:14:14.7290504Z",
"Path": "docker-entrypoint.sh",
"Args": [
"postgres"
],
"State": {
"Status": "running",
"Running": true,
"Paused": false,
"Restarting": false,
"OOMKilled": false,
"Dead": false,
"Pid": 8057,
"ExitCode": 0,
"Error": "",
"StartedAt": "2020-01-16T19:14:15.5451891Z",
"FinishedAt": "0001-01-01T00:00:00Z"
},
"Image": "sha256:e2d75d1c1264a777df31dcbd4fd452b238134eb27854c2a173fdbfaa47ce9b87",
"ResolvConfPath": "/var/lib/docker/containers/426744f8c0a90b504c4d7c22242929f4b7f833e3ff4ddb9a112139d18ffd7c10/resolv.conf",
"HostnamePath": "/var/lib/docker/containers/426744f8c0a90b504c4d7c22242929f4b7f833e3ff4ddb9a112139d18ffd7c10/hostname",
"HostsPath": "/var/lib/docker/containers/426744f8c0a90b504c4d7c22242929f4b7f833e3ff4ddb9a112139d18ffd7c10/hosts",
"LogPath": "/var/lib/docker/containers/426744f8c0a90b504c4d7c22242929f4b7f833e3ff4ddb9a112139d18ffd7c10/426744f8c0a90b504c4d7c22242929f4b7f833e3ff4ddb9a112139d18ffd7c10-json.log",
"Name": "/lil-postgres",
"RestartCount": 0,
"Driver": "overlay2",
"Platform": "linux",
"MountLabel": "",
"ProcessLabel": "",
"AppArmorProfile": "",
"ExecIDs": null,
"HostConfig": {
"Binds": [
"/Users/hamzabelmellouki/srv/postgres:/var/lib/postgresql/data"
],
"ContainerIDFile": "",
"LogConfig": {
"Type": "json-file",
"Config": {}
},
"NetworkMode": "default",
"PortBindings": {
"5432/tcp": [
{
"HostIp": "",
"HostPort": "5432"
}
]
},
"RestartPolicy": {
"Name": "no",
"MaximumRetryCount": 0
},
"AutoRemove": true,
"VolumeDriver": "",
"VolumesFrom": null,
"CapAdd": null,
"CapDrop": null,
"Capabilities": null,
"Dns": [],
"DnsOptions": [],
"DnsSearch": [],
"ExtraHosts": null,
"GroupAdd": null,
"IpcMode": "private",
"Cgroup": "",
"Links": null,
"OomScoreAdj": 0,
"PidMode": "",
"Privileged": false,
"PublishAllPorts": false,
"ReadonlyRootfs": false,
"SecurityOpt": null,
"UTSMode": "",
"UsernsMode": "",
"ShmSize": 67108864,
"Runtime": "runc",
"ConsoleSize": [
0,
0
],
"Isolation": "",
"CpuShares": 0,
"Memory": 0,
"NanoCpus": 0,
"CgroupParent": "",
"BlkioWeight": 0,
"BlkioWeightDevice": [],
"BlkioDeviceReadBps": null,
"BlkioDeviceWriteBps": null,
"BlkioDeviceReadIOps": null,
"BlkioDeviceWriteIOps": null,
"CpuPeriod": 0,
"CpuQuota": 0,
"CpuRealtimePeriod": 0,
"CpuRealtimeRuntime": 0,
"CpusetCpus": "",
"CpusetMems": "",
"Devices": [],
"DeviceCgroupRules": null,
"DeviceRequests": null,
"KernelMemory": 0,
"KernelMemoryTCP": 0,
"MemoryReservation": 0,
"MemorySwap": 0,
"MemorySwappiness": null,
"OomKillDisable": false,
"PidsLimit": null,
"Ulimits": null,
"CpuCount": 0,
"CpuPercent": 0,
"IOMaximumIOps": 0,
"IOMaximumBandwidth": 0,
"MaskedPaths": [
"/proc/asound",
"/proc/acpi",
"/proc/kcore",
"/proc/keys",
"/proc/latency_stats",
"/proc/timer_list",
"/proc/timer_stats",
"/proc/sched_debug",
"/proc/scsi",
"/sys/firmware"
],
"ReadonlyPaths": [
"/proc/bus",
"/proc/fs",
"/proc/irq",
"/proc/sys",
"/proc/sysrq-trigger"
]
},
"GraphDriver": {
"Data": {
"LowerDir": "/var/lib/docker/overlay2/baabe07f985a61979a3752f7e3c43116b980c45682d27c660b2867a6af3da28b-init/diff:/var/lib/docker/overlay2/ac6700580b74ace6c2f4eb9c274ef405124afb8019948c51516b496ed62eae8d/diff:/var/lib/docker/overlay2/35c484f8059617661ae54f749d0b938e7d81bc2089dd81ef81952aed6079c30b/diff:/var/lib/docker/overlay2/1649505946cf497fd95a5b7a118150a09315767464671f93459e3324f8e5ac42/diff:/var/lib/docker/overlay2/69a4818765c800f405e11c7755e184e4fd0837b68b4664821cf9c80daa7b629b/diff:/var/lib/docker/overlay2/177d3596510c3fdb235ec84728b8b6baf23a406dca3e9a3bfb45e98b48fe2395/diff:/var/lib/docker/overlay2/07d15f6f98f43ff88e6bdf9e361fadaaa46f83121278b5dbddac372cb95d99b8/diff:/var/lib/docker/overlay2/5e10c2001ef13459900f124ae825c210e2e001b0aa2f8b5e1e7c8c5c27d9e403/diff:/var/lib/docker/overlay2/b1e7828ebe991a7401746f581fd640bca3ae74f3a9820fd15e0fb2c666a08754/diff:/var/lib/docker/overlay2/e1b274467493537d29e25cce71acf9c3020d8a2e25080c75aa0fca10a5c05789/diff:/var/lib/docker/overlay2/11141fed542b6c519ec7621e0c4f341d2b2822a7c2885980216a2ef27609ffe0/diff:/var/lib/docker/overlay2/c3e4e9634bfe6a9e4b26f3d2d5751b2fa01aae0e8e1679a800accd94179d527d/diff:/var/lib/docker/overlay2/e7da8a834521c827046a2dc64f6f39afa6fded7f1af3241c75c592756d3053d6/diff:/var/lib/docker/overlay2/91d22f9b7d3aa1fae5cabcfe245a18c7dc6ac372696c73be70b65f7c8b42f1f4/diff:/var/lib/docker/overlay2/1a2021467ef42428eda11a9aef133e4b7ee9364266255abe5a0f2df4a9ff2584/diff",
"MergedDir": "/var/lib/docker/overlay2/baabe07f985a61979a3752f7e3c43116b980c45682d27c660b2867a6af3da28b/merged",
"UpperDir": "/var/lib/docker/overlay2/baabe07f985a61979a3752f7e3c43116b980c45682d27c660b2867a6af3da28b/diff",
"WorkDir": "/var/lib/docker/overlay2/baabe07f985a61979a3752f7e3c43116b980c45682d27c660b2867a6af3da28b/work"
},
"Name": "overlay2"
},
"Mounts": [
{
"Type": "bind",
"Source": "/Users/hamzabelmellouki/srv/postgres",
"Destination": "/var/lib/postgresql/data",
"Mode": "",
"RW": true,
"Propagation": "rprivate"
}
],
"Config": {
"Hostname": "426744f8c0a9",
"Domainname": "",
"User": "",
"AttachStdin": false,
"AttachStdout": false,
"AttachStderr": false,
"ExposedPorts": {
"5432/tcp": {}
},
"Tty": false,
"OpenStdin": false,
"StdinOnce": false,
"Env": [
"POSTGRES_USER=hamzabelmellouki",
"POSTGRES_PASSWORD=password",
"PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/lib/postgresql/11/bin",
"GOSU_VERSION=1.11",
"LANG=en_US.utf8",
"PG_MAJOR=11",
"PG_VERSION=11.5-1.pgdg90+1",
"PGDATA=/var/lib/postgresql/data"
],
"Cmd": [
"postgres"
],
"Image": "postgres",
"Volumes": {
"/var/lib/postgresql/data": {}
},
"WorkingDir": "",
"Entrypoint": [
"docker-entrypoint.sh"
],
"OnBuild": null,
"Labels": {}
},
"NetworkSettings": {
"Bridge": "",
"SandboxID": "2649b309ebde1f690927a1081497c9dc05dc249642b429f25d930243eb81e08f",
"HairpinMode": false,
"LinkLocalIPv6Address": "",
"LinkLocalIPv6PrefixLen": 0,
"Ports": {
"5432/tcp": [
{
"HostIp": "0.0.0.0",
"HostPort": "5432"
}
]
},
"SandboxKey": "/var/run/docker/netns/2649b309ebde",
"SecondaryIPAddresses": null,
"SecondaryIPv6Addresses": null,
"EndpointID": "f01f60128018d8634f26a0c683ee6865e20361548b3a49007804dc913bfc4292",
"Gateway": "172.17.0.1",
"GlobalIPv6Address": "",
"GlobalIPv6PrefixLen": 0,
"IPAddress": "172.17.0.2",
"IPPrefixLen": 16,
"IPv6Gateway": "",
"MacAddress": "02:42:ac:11:00:02",
"Networks": {
"bridge": {
"IPAMConfig": null,
"Links": null,
"Aliases": null,
"NetworkID": "045d48c0f1d22cb7c319d6e850f6e9985a08e6d08884a79e823dbd0ac6c8a1b9",
"EndpointID": "f01f60128018d8634f26a0c683ee6865e20361548b3a49007804dc913bfc4292",
"Gateway": "172.17.0.1",
"IPAddress": "172.17.0.2",
"IPPrefixLen": 16,
"IPv6Gateway": "",
"GlobalIPv6Address": "",
"GlobalIPv6PrefixLen": 0,
"MacAddress": "02:42:ac:11:00:02",
"DriverOpts": null
}
}
}
}
]

Answer 1

maybe,you can use docker-compose to defining and running multi-container docker applications(postgres+spring-boot) and you use a YAML file to configure your application's services.
So,You must create new volumes with different path to insert new data with new schema and configuration,because if you use volumes that already used before so you will find the problems like password authentication failed for user “hamzabelmellouki”
or the user(role) “hamzabelmellouki” does not existe or the database "database's name" does not existe because they have other user rhat created before .
#####docker-compose.yml#####
version: '3'
services:
db:
image: postgres
container_name: lil-postgres
ports:
- "5432:5432"
restart: unless-stopped
volumes:
- "./postgres/data:/var/lib/postgresql/data"
environment:
POSTGRES_USER: hamzabelmellouki
POSTGRES_PASSWORD: password
POSTGRES_DB: hamzabelmellouki
networks:
- product-net
product:
image: ensa/product-manager
restart: unless-stopped
ports:
- "8080:8080"
depends_on:
- db
networks:
- product-net
networks:
product-net:
driver: bridge
volumes:
db:
driver: local

Answer 2

Try below:
While running Postgres container, you have not provided any username , it should be something like:
docker run --rm --net="host" --name lil-postgres -e POSTGRES_USER=hamzabelmellouki -e POSTGRES_PASSWORD=password -d -v $HOME/srv/postgres:/var/lib/postgresql/data -p 5432:5432 postgres:9.6
by default Postgres container will run in bridge network (default docker network) and in your app, you've provided --net="host"
So maybe due to that, they are not able to communicate.
Provide the same network while running both
You can check it by below command
docker inspect container_name (or container_id)
Its nothing related, still, I've updated the docker image tag(Postgres:9.6), as it's always good to use a particular tag name, instead of default one (latest tag).

Answer 3

Try changing localhost by the ip adresse 172.17.0.2 in the application.properties spring.datasource.url=jdbc:postgresql://172.17.0.2:5432/testdb