I try to start 2 containers with the following docker compose file:
version: '2'
services:
client-app:
image: client-app:latest
build: ./client-app/Dockerfile
volumes:
- ./client-app:/usr/src/app
ports:
- 3000:8000
spring-boot-server:
build: ./spring-boot-server/Dockerfile
volumes:
- ./spring-boot-server:/usr/src/app
ports:
- 7000:7000
The spring boot server tries to connect to a remote database server which is on another host and network. Docker successfully starts the client-app containers but fails to start the spring-boot-server. This log is showing that the server crashed because it has failed to connect to the remote database:
2021-01-25 21:02:28.393 INFO 1 --- [main] com.zaxxer.hikari.HikariDataSource: HikariPool-1 - Starting...
2021-01-25 21:02:29.553 ERROR 1 --- [main] com.zaxxer.hikari.pool.HikariPool: HikariPool-1 - Exception during pool initialization.
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.
The Dockerfiles of both containers create valid images by which I can run manually the containers. It looks like there are some default network restrictions on containers started by a composing file.
Docker compose version running on Ubuntu:
docker-compose version 1.8.0, build unknown
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FURTHER INVESTIGATIONS:
I had created a Dockerfile
FROM ubuntu
RUN apt-get update
RUN apt-get install -y mysql-client
CMD mysql -A -P 3306 -h 8.8.8.8 --user=root --password=mypassword -e "SELECT VERSION()" mydatabase
along with a docker-compose.yml
version: '2'
services:
test-remote-db-compose:
build: .
ports:
- 8000:8000
to test aside the connectivity alone with the remote database. The test passed with success.
