Not able to connect with MySQL server to Spring Application in Docker? - docker

Question

i'm new to Docker, as a part of dockerization of spring mvc application , i'm not able to connect my application to MySQL server
Dockerfile :this is Spring mvc application so need to copy my war to
tomcat container
FROM tomcat:8.0.20-jre8
COPY /target/CTH.war /usr/local/tomcat/webapps/
docker-compose.yml
version: '3'
services:
mysql-standalone:
image: 'mysql:5.7'
command: mysqld --character-set-server=utf8mb4 --collation-server=utf8mb4_unicode_ci
volumes:
- ./docker/provision/mysql/init:/docker-entrypoint-initdb.d
environment:
- MYSQL_ROOT_PASSWORD= root
- MYSQL_USER= root
- MYSQL_PASSWORD= root
- MYSQL_DATABASE= CTH
- MYSQL_DATABASE= CTH_CHAT
ports:
- "3307:3306"
cth-docker-container:
image: cth-docker-container
ports:
- "8082:8082"
environment:
CTH_DATASOURCE_DATABASE: CTH
CTH_DATASOURCE_SERVERNAME: mysql-standalone
CTH_DATASOURCE_USERNAME: root
CTH_DATASOURCE_PASSWORD: root
CTH_DATASOURCE_PORT: 3307
CTH_CHAT_DATASOURCE_DATABASE: CTH_CHAT
CTH_CHAT_DATASOURCE_SERVERNAME: mysql-standalone
CTH_CHAT_DATASOURCE_USERNAME: root
CTH_CHAT_DATASOURCE_PASSWORD: root
CTH_CHAT_DATASOURCE_PORT: 3307
build:
context: "./"
dockerfile: "Dockerfile"
depends_on:
- mysql-standalone
application.properties :this is spring mvc application and application uses MySQL db with two databases
1st db
dbuser.local=${CTH_DATASOURCE_USERNAME:root}
dbpassword.local=${CTH_DATASOURCE_PASSWORD:root}
dbdatabaseName.local=${CTH_DATASOURCE_DATABASE:CTH}
dbserverName.local=${CTH_DATASOURCE_SERVERNAME:localhost}
dbportNumber.local=${CTH_DATASOURCE_PORT:3306}
2nd db
dbuser.cth.chat.local=${CTH_CHAT_DATASOURCE_USERNAME:root}
dbpassword.cth.chat.local=${CTH_CHAT_DATASOURCE_PASSWORD:root}
dbdatabaseName.cth.chat.local=${CTH_CHAT_DATASOURCE_USERNAME:CTH_CHAT}
dbserverName.cth.chat.local=${CTH_CHAT_DATASOURCE_SERVERNAME:localhost}
dbportNumber.cth.chat.local=${CTH_CHAT_DATASOURCE_PORT:3306}
i read articles from which i created dockerfile and docker-compose file https://medium.com/#asce4s/dockerize-spring-mvc-application-a9ffbd11eadb https://github.com/abagayev/docker-bootstrap-collection/tree/master/mysql-few-databases/docker/provision/mysql/init
but i'm getting following erros when i execute
docker-compose -f docker-compose.yml up
Caused by: com.mysql.cj.core.exceptions.CJCommunicationsException: Communications link failure
cth-docker-container_1 |
cth-docker-container_1 | The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.
cth-docker-container_1 | at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
cth-docker-container_1 | at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
cth-docker-container_1 | at java.base/jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
cth-docker-container_1 | at java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:490)
cth-docker-container_1 | at com.mysql.cj.core.exceptions.ExceptionFactory.createException(ExceptionFactory.java:54)
cth-docker-container_1 | at com.mysql.cj.core.exceptions.ExceptionFactory.createException(ExceptionFactory.java:93)
cth-docker-container_1 | at com.mysql.cj.core.exceptions.ExceptionFactory.createException(ExceptionFactory.java:133)
cth-docker-container_1 | at com.mysql.cj.core.exceptions.ExceptionFactory.createCommunicationsException(ExceptionFactory.java:149)
cth-docker-container_1 | at com.mysql.cj.mysqla.io.MysqlaSocketConnection.connect(MysqlaSocketConnection.java:83)
cth-docker-container_1 | at com.mysql.cj.mysqla.MysqlaSession.connect(MysqlaSession.java:122)
cth-docker-container_1 | at com.mysql.cj.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:1754)
cth-docker-container_1 | at com.mysql.cj.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:1624)
cth-docker-container_1 | ... 125 common frames omitted
cth-docker-container_1 | Caused by: java.net.UnknownHostException: mysql-standalone
cth-docker-container_1 | at java.base/java.net.InetAddress$CachedAddresses.get(InetAddress.java:797)
cth-docker-container_1 | at java.base/java.net.InetAddress.getAllByName0(InetAddress.java:1505)
cth-docker-container_1 | at java.base/java.net.InetAddress.getAllByName(InetAddress.java:1364)
cth-docker-container_1 | at java.base/java.net.InetAddress.getAllByName(InetAddress.java:1298)
cth-docker-container_1 | at com.mysql.cj.core.io.StandardSocketFactory.connect(StandardSocketFactory.java:179)
cth-docker-container_1 | at com.mysql.cj.mysqla.io.MysqlaSocketConnection.connect(MysqlaSocketConnection.java:57)
cth-docker-container_1 | ... 128 common frames omitted
i'm stuck and not getting if i have set wrong environment or my way is not correct your any suggestion i'll definitely help me
thanks!

Answer 1

After reading lots of articles, I got success to up my application with MySQL db in a docker container and access in Mysql workbench.
here is my docker-compose file
version: '3'
services:
app:
container_name: cth-app
build:
context: .
dockerfile: Dockerfile
ports:
- '8080:8080'
environment:
##db1
CTH_DATASOURCE_DATABASE: CTH
CTH_DATASOURCE_HOST: mysqldb
CTH_DATASOURCE_USERNAME: cth
CTH_DATASOURCE_PASSWORD: root
CTH_DATASOURCE_PORT: 3306
##db2
CTH_CHAT_DATASOURCE_DATABASENAME: CTH_CHAT
CTH_CHAT_DATASOURCE_HOST: mysqldb
CTH_CHAT_DATASOURCE_USERNAME: cth
CTH_CHAT_DATASOURCE_PASSWORD: root
CTH_CHAT_DATASOURCE_PORT: 3306
depends_on:
- mysqldb
mysqldb:
image: mysql/mysql-server:5.7
container_name: mysqldb
command: mysqld --character-set-server=utf8mb4 --collation-server=utf8mb4_unicode_ci
##here i am able to access dump file which I'll create two databases
with user created for me.
volumes:
- ./docker/provision/mysql/init:/docker-entrypoint-initdb.d
ports:
- '3308:3306'
environment:
MYSQL_ROOT_PASSWORD: root
MYSQL_USER: cth
MYSQL_PASSWORD: root
you need to create a dump file refer the article [ https://github.com/abagayev/docker-bootstrap-collection/tree/master/mysql-few-databases]
when you'll docker-compose up -d --build
your application is up running on port 8080, with MySQL DB running inside a host machine
Thanks!