Container hostname is not resolved to IP - docker

Question

I am trying to set the host for connection to Neo4j in the application.conf file using environment variable which is going to be set in a Dockerfile. Neo4j is used as an image from the docker-compose.yml file.
When I run an image of the application with the hostname of the Neo4j container I get an error ServiceUnavailableException: Unable to connect to neo4jdb:7687, ensure the database is running and that there is a working network connection to it
So the name of the container is not resolved to the IP-address. How can I fix it?
Configurations file:
neo4j{
url= "bolt://localhost:7687"
url= ${?HOSTNAME}
user = "user"
password = "password"
}
Application Dockerfile:
FROM java:8
ARG ARG_CLASS
ENV MAIN_CLASS $ARG_CLASS
ENV SCALA_VERSION 2.11.8
ENV SBT_VERSION 1.1.1
ENV SPARK_VERSION 2.2.0
ENV SPARK_DIST spark-$SPARK_VERSION-bin-hadoop2.6
ENV SPARK_ARCH $SPARK_DIST.tgz
ENV HOSTNAME bolt://neo4jdb:7687
VOLUME /workdir
WORKDIR /opt
# Install Scala
RUN \
cd /root && \
curl -o scala-$SCALA_VERSION.tgz http://downloads.typesafe.com/scala/$SCALA_VERSION/scala-$SCALA_VERSION.tgz && \
tar -xf scala-$SCALA_VERSION.tgz && \
rm scala-$SCALA_VERSION.tgz && \
echo >> /root/.bashrc && \
echo 'export PATH=~/scala-$SCALA_VERSION/bin:$PATH' >> /root/.bashrc
# Install SBT
RUN \
curl -L -o sbt-$SBT_VERSION.deb https://dl.bintray.com/sbt/debian/sbt-$SBT_VERSION.deb && \
dpkg -i sbt-$SBT_VERSION.deb && \
rm sbt-$SBT_VERSION.deb
# Install Spark
RUN \
cd /opt && \
curl -o $SPARK_ARCH http://d3kbcqa49mib13.cloudfront.net/$SPARK_ARCH && \
tar xvfz $SPARK_ARCH && \
rm $SPARK_ARCH && \
echo 'export PATH=$SPARK_DIST/bin:$PATH' >> /root/.bashrc
EXPOSE 9851 9852 4040 9092 9200 9300 5601 7474 7687 7473
CMD /workdir/runDemo.sh "$MAIN_CLASS"
I build and run my application separately with this commands:
docker build -t container-name --build-arg ARG_CLASS=producer .
docker run -v ${PWD}/:/workdir -w /workdir container-name
Docker-compose file looks like this:
version: '3.3'
services:
kafka:
image: spotify/kafka
ports:
- "9092:9092"
networks:
- docker_elk
environment:
- ADVERTISED_HOST=localhost
neo4jdb:
image: neo4j:latest
ports:
- "7474:7474"
- "7473:7473"
- "7687:7687"
networks:
- docker_elk
volumes:
- /var/lib/neo4j/import:/var/lib/neo4j/import
- /var/lib/neo4j/data:/data
- /var/lib/neo4j/conf:/conf
environment:
- NEO4J_dbms_active__database=graphImport.db
elasticsearch:
image: elasticsearch:latest
ports:
- "9200:9200"
- "9300:9300"
networks:
- docker_elk
volumes:
- esdata1:/usr/share/elasticsearch/data
kibana:
image: kibana:latest
ports:
- "5601:5601"
networks:
- docker_elk
volumes:
esdata1:
driver: local
networks:
docker_elk:
driver: bridge

Answer 1

Defining all the application containers in one docker-compose file worked. Hostnames of all the containers are resolved.
version: '3.3'
services:
kafka:
image: spotify/kafka
ports:
- "9092:9092"
environment:
- ADVERTISED_HOST=localhost
neo4jdb:
image: neo4j:latest
hostname: neo4jdb
ports:
- "7474:7474"
- "7473:7473"
- "7687:7687"
volumes:
- /var/lib/neo4j/import:/var/lib/neo4j/import
- /var/lib/neo4j/data:/var/lib/neo4j/data
- /var/lib/neo4j/conf:/var/lib/neo4j/conf
environment:
- NEO4J_dbms_active__database=graphImport.db
elasticsearch:
image: elasticsearch:latest
ports:
- "9200:9200"
- "9300:9300"
networks:
- docker_elk
volumes:
- esdata1:/usr/share/elasticsearch/data
kibana:
image: kibana:latest
ports:
- "5601:5601"
networks:
- docker_elk
consumer-demo:
build:
context: .
dockerfile: Dockerfile
args:
- HOST=neo4jdb
volumes:
- ./:/workdir
working_dir: /workdir
depends_on:
- neo4jdb
- kafka
- elasticsearch
- kibana
links:
- neo4jdb
- kafka
- elasticsearch
- kibana
producer-demo:
build:
context: .
dockerfile: Dockerfile
args:
- HOST=neo4jdb
volumes:
- ./:/workdir
working_dir: /workdir
depends_on:
- neo4jdb
- kafka
- elasticsearch
- kibana
links:
- neo4jdb
- kafka
- elasticsearch
- kibana
- consumer-demo
volumes:
esdata1:
driver: local
networks:
docker_elk:
driver: bridge