I have two services, spring boot docker and when I try communication with rest template I got java.net.ConnectException: Connection refused (Connection refused)
url is http://localhost:8081/api/v1/package/250Mbps
Service 1 docker-compose.yml:
product_catalogue_service:
image: openjdk:8-jdk-alpine
ports:
- "8081:8081"
volumes:
- .:/app
working_dir: /app
command: ./gradlew bootRun
restart: on-failure
Service 2 docker-compose.yml:
order_service:
image: openjdk:8-jdk-alpine
ports:
- "8083:8083"
volumes:
- .:/app
working_dir: /app
command: ./gradlew bootRun
restart: on-failure
Rest template URL, and it is working when I run project 2 from the IntelliJ:
http://localhost:8081/api/v1/package/250Mbps
When I run docker ps, name of first service is:
productcatalogueservice_product_catalogue_service_1
I tried to use that instead of localhost - unknown host exception.
I tried "product_catalogue_service_1" instead, also unknown host exception,
and finally I tried "product_catalogue_service" also unknown host exception.
Any idea?
By default, docker-compose creates a network between your containters and assign the serivce name as de host name.
So, you can reach the product_catalog_service from order_service like so: http://product_catalog_service:8081/api/v1/package/250Mbps
Now, from your post it seems that you have two different docker-compose.yml files, one for each service. In this case, each container is living in its own network (created by docker-compose) and they can't see each other, at least by default.
Honestly, I've never try to connect two containers created from two different docker-compose files. I always create one docker-compose.yml file, put there all my services and let docker-compose manage the network between them.
Using one docker-compose.yml
version: ...
services:
product_catalogue_service:
image: openjdk:8-jdk-alpine
ports:
- "8081:8081"
volumes:
- .:/app
working_dir: /app
command: ./gradlew bootRun
restart: on-failure
order_service:
image: openjdk:8-jdk-alpine
ports:
- "8083:8083"
volumes:
- .:/app
working_dir: /app
command: ./gradlew bootRun
restart: on-failure
One last thing, this answer explains in great detail why localhost:8081 is not working from your order_service container.
Related
I have a project Spring Boot MVC and Mysql Database with Dockerfile and docker-compose.yml and I want to push this project to the hub docker that to run every client as you know. I pushed to the docker hub successfully with the docker-compose push command, but after that when I pull my image from the hub docker it doesn't work because there are some errors occurs for an instance connection refuesed and etc error happens. but in my device it work perfectly I mean I am runing my project successfully with the docker container.
This is my Dockerfile:
FROM maven:3.8.2-jdk-11
WORKDIR /empmanagment-app
COPY . .
RUN mvn clean install
CMD mvn spring-boot:run
and this is my docker-compose.yml file
version: '3'
services:
mysql-standalone:
image: 'mysql:5.7'
environment:
- MYSQL_ROOT_PASSWORD=root
- MYSQL_ROOT_USER=root
- MYSQL_PASSWORD=root
- MYSQL_DATABASE=elvin_emp_managment
ports:
- "3307:3306"
networks:
- common-network
volumes:
- mysql-standalone:/var/lib/mysql
springboot-docker-container:
build: ./
image: anar1501/emp-managment
ports:
- "8080:8080"
networks:
- common-network
environment:
SPRING_DATASOURCE_URL: jdbc:mysql://mysql-standalone:3306/elvin_emp_managment?autoReconnect=true&useSSL=false
SPRING_DATASOURCE_USERNAME: "root"
SPRING_DATASOURCE_PASSWORD: "root"
depends_on:
- mysql-standalone
volumes:
- .m2:/root/.m2
volumes:
mysql-standalone:
networks:
common-network:
driver: bridge
can anyone prefer any suggest, that what I am doing?
Let me start off by stating that I know this question has been asked on many forums. I have read them all.
I have two Docker containers that are built with docker-compose and contain a Laravel project each. They are both attached to a network and can ping one another successfully, however, when I make a request from Postman to the one backend that then makes a curl request to the other, I get the connection refused error shown below.
This is my docker-compose file for each project respectfully:
version: '3.8'
services:
bumblebee:
build:
context: .
dockerfile: Dockerfile
volumes:
- .:/app
networks:
- picknpack
ports:
- "8010:8000"
networks:
picknpack:
external: true
version: '3.8'
services:
optimus:
build:
context: .
dockerfile: Dockerfile
volumes:
- .:/app
ports:
- "8020:8000"
networks:
- picknpack
depends_on:
- optimus_db
optimus_db:
image: mysql:8.0.25
environment:
MYSQL_DATABASE: optimus
MYSQL_USER: test
MYSQL_PASSWORD: test1234
MYSQL_ROOT_PASSWORD: root
volumes:
- ./storage/dbdata:/var/lib/mysql
ports:
- "33020:3306"
networks:
picknpack:
external: true
Here you can see the successful ping:
I would love to keep messing with configuration files but I have a deadline to meet and nothing is working, any help would be appreciated.
EDIT
Please see inspection of network:
Within the docker network that I created, both containers are exposed on port 8000 as per their Dockerfiles. It was looking at me square in the face: 'Connection refused on port 80'. The HTTP client was using that as default rather than 8000. I updated the curl request to hit port 8000 and it works now. Thanks to #user3532758 for your help. Note that the containers are mapped to ports 8010 and 8020 in the external local network, not within the docker network. There they are both served on port 8000 with different IPs
I had previously built a Docker image of each Spring micro-service, and in the docker-compose.yml file this is what I did to start them and have some other services being registered by Eureka's service, by overriding defaultZone passing the container's name:
version: '3'
services:
eureka-discovery:
image: eureka-discovery-service:0.0.1
ports:
- 8761:8761
zuul-gateway:
image: zuul-gateway-service:0.0.1
environment:
- eureka.client.serviceUrl.defaultZone=http://eureka-discovery:8761/eureka
depends_on:
- eureka-discovery
ports:
- 8765:8765
It worked. Now, I did things a little different, by bind mounting my project into a container for local development:
version: '3.1'
services:
eureka-discovery-service:
container_name: eureka-discovery-service
image: openjdk:11.0.9.1-jdk
ports:
- 8761:8761
volumes:
- ./eureka-discovery-service:/usr/src/app
working_dir: /usr/src/app
command: ./mvnw spring-boot:run
zuul-gateway-service:
container_name: zuul-gateway-service
image: openjdk:11.0.9.1-jdk
environment:
- eureka.client.serviceUrl.defaultZone=http://eureka-discovery-service:8761/eureka
ports:
- 8765:8765
volumes:
- ./zuul-gateway-service:/usr/src/app
working_dir: /usr/src/app
command: ./mvnw spring-boot:run
depends_on:
- eureka-discovery-service
links:
- eureka-discovery-service
But with things like this, zuul-gateway-service doesn't see eureka-discovery-service like it did before.
2020-12-17 23:26:29.997 ERROR 78 --- [freshExecutor-0] com.netflix.discovery.DiscoveryClient : DiscoveryClient_ZUUL-GATEWAY-SERVICE/7c580b412063:zuul-gateway-service:8765 - was unable to refresh its cache! status = Cannot execute request on any known server
I notice that it's using the Eureka container's ID instead of its name.
I managed to make it work by altering the command and overriding the property there instead of on environments:
command: ./mvnw spring-boot:run -Dspring-boot.run.arguments=--eureka.client.serviceUrl.defaultZone=http://eureka-discovery-service:8761/eureka
If there'd be a better way, I'd like to know.
I'm new to docker and started to play with it on my small project.
I have dockerized the service itself with the following Docker file:
ROM adoptopenjdk:11-jdk-hotspot AS DEPENDENCIES_BUILD_IMAGE
ENV APP_HOME=/usr/app/
WORKDIR $APP_HOME
COPY build.gradle settings.gradle gradlew $APP_HOME
COPY gradle $APP_HOME/gradle
RUN ./gradlew build || return 0
COPY . .
RUN ./gradlew build
FROM adoptopenjdk/openjdk11:jdk-11.0.7_10-alpine AS FINAL
ENV JAR_TEMPLATE=myapp-0.0.1-SNAPSHOT.jar
ENV ARTIFACT_NAME=myapp.jar
ENV APP_HOME=/usr/app
WORKDIR $APP_HOME
COPY --from=DEPENDENCIES_BUILD_IMAGE $APP_HOME/build/libs/$JAR_TEMPLATE .
RUN mv $JAR_TEMPLATE $ARTIFACT_NAME
EXPOSE 8080
CMD ["java", "-jar", "budget-calculator.jar"]
Side note - I know that there's a problem that I'm always copying 0.0.1-SNAPSHOT - but I'm not sure how to solve it at the moment.
After that I wanted to connect my service to a Postgres DB with docker-compose using this confirmation:
version: '3'
services:
backend:
build: .
container_name: myapp
ports:
- "8080:8080"
links:
- "db"
depends_on:
- db
networks:
- backend
db:
restart: unless-stopped
image: postgres:10
container_name: myapp-db
environment:
- POSTGRES_USER=postgres
- POSTGRES_PASSWORD=secret
- POSTGRES_DB=myapp
ports:
- 5436:5436
networks:
- backend
networks:
backend:
After that I've updated my application.properties file to indicate that the DB link is on the other container as follow:
spring.flyway.url=jdbc:postgresql://db:5436/myapp
spring.flyway.user=postgres
spring.flyway.password=secret
spring.flyway.baseline-on-migrate=true
spring.datasource.url=jdbc:postgresql://db:5436/myapp
spring.datasource.username=postgres
spring.datasource.password=secret
spring.datasource.driverClassName=org.postgresql.Driver
Now I had 2 problems:
While I assumed that build: . will rebuild my image every time
that I'm running docker-compose up if something changed in
practice I saw that it's not the case.
When the backend service starts flyway (a migration DB library) try
to connect to the database and cannot resolve the connection.
I've seen online that the usage of - links is deprecated and I should use the networks but both do not seem to work - what am I missing?
There are 2 problems with my configurations, the first one - the internal port of Postgres was configured as 5436 while the default port of the image is 5432 (I've updated both of them to 5432)
the second one, in order to pass the IP of the DB to the service I've added the following environment variables to the service image:
environment: # Pass environment variables to the service
SPRING_DATASOURCE_URL: jdbc:postgresql://db:5432/budget
SPRING_DATASOURCE_USERNAME: postgres
SPRING_DATASOURCE_PASSWORD: secret
SPRING_FLYWAY_URL: jdbc:postgresql://db:5432/budget
SPRING_FLYWAY_USER: postgres
SPRING_FLYWAY_PASSWORD: secret
So my current working configuration is this:
version: '3.8'
services:
backend:
build: .
container_name: app-service
ports:
- "8080:8080"
depends_on:
- db
environment: # Pass environment variables to the service
SPRING_DATASOURCE_URL: jdbc:postgresql://db:5432/myapp
SPRING_DATASOURCE_USERNAME: postgres
SPRING_DATASOURCE_PASSWORD: secret
SPRING_FLYWAY_URL: jdbc:postgresql://db:5432/myapp
SPRING_FLYWAY_USER: postgres
SPRING_FLYWAY_PASSWORD: secret
db:
restart: unless-stopped
image: postgres:10
environment:
- POSTGRES_DB=myapp
- POSTGRES_PASSWORD=postgres
- POSTGRES_USER=secret
volumes:
- myapp_data:/var/lib/postgresql/data
ports:
- 5432:5432
volumes:
myapp_data:
I have a Java Spring Boot app which works with a Postgres database. I want to use Docker for both of them. I initially put just the Postgres in Docker, and I had a docker-compose.yml file defined like this:
version: '2'
services:
db:
container_name: sample_db
image: postgres:9.5
volumes:
- sample_db:/var/lib/postgresql/data
environment:
- POSTGRES_PASSWORD=sample
- POSTGRES_USER=sample
- POSTGRES_DB=sample
- PGDATA=/var/lib/postgresql/data/pgdata
ports:
- 5432:5432
volumes:
sample_db: {}
Then, when I issued the commands sudo dockerd and sudo docker-compose -f docker-compose.yml up, it was starting the database. I could connect using pgAdmin for example, by using localhost as server and port 5432. Then, in my Spring Boot app, inside the application.properties file I defined the following properties.
spring.datasource.url=jdbc:postgresql://localhost:5432/sample
spring.datasource.username=sample
spring.datasource.password=sample
spring.jpa.generate-ddl=true
At this point I could run my Spring Boot app locally through Spring Suite, and it all was working fine. Then, I wanted to also add my Spring Boot app as Docker image. I first of all created a Dockerfile in my project directory, which looks like this:
FROM java:8
EXPOSE 8080
ADD /target/manager.jar manager.jar
ENTRYPOINT ["java","-jar","manager.jar"]
Then, I entered to the directory of the project issued mvn clean followed by mvn install. Next, issued docker build -f Dockerfile -t manager . followed by docker tag 9c6b1e3f1d5e myuser/manager:latest (the id is correct). Finally, I edited my existing docker-compose.yml file to look like this:
version: '2'
services:
web:
image: myuser/manager:latest
ports:
- 8080:8080
depends_on:
- db
db:
container_name: sample_db
image: postgres:9.5
volumes:
- sample_db:/var/lib/postgresql/data
environment:
- POSTGRES_PASSWORD=sample
- POSTGRES_USER=sample
- POSTGRES_DB=sample
- PGDATA=/var/lib/postgresql/data/pgdata
ports:
- 5432:5432
volumes:
sample_db: {}
But, now if I issue sudo docker-compose -f docker-compose.yml up command, the database again starts correctly, but I get errors and exit code 1 for the web app part. The problem is the connection string. I believe I have to change it to something else, but I don't know what it should be. I get the following error messages:
web_1 | 2017-06-27 22:11:54.418 ERROR 1 --- [ main] o.a.tomcat.jdbc.pool.ConnectionPool : Unable to create initial connections of pool.
web_1 |
web_1 | org.postgresql.util.PSQLException: Connection to localhost:5432 refused. Check that the hostname and port are correct and that the postmaster is accepting TCP/IP connections
Any ideas?
Each container has its own network interface with its own localhost. So change how Java points to Postgres:
spring.datasource.url=jdbc:postgresql://localhost:5432/sample
To:
spring.datasource.url=jdbc:postgresql://db:5432/sample
db will resolve to the proper Postgres IP.
Bonus. With docker-compose you don't need to build your image by hand. So change:
web:
image: myuser/manager:latest
To:
web:
build: .
I had the same problem and I lost some time to understand and solve this problem:
org.postgresql.util.PSQLException: Connection to localhost:5432 refused. Check that the hostname and port are correct and that the postmaster is accepting TCP/IP connections.
I show all the properties so that everyone understands.
application.properties:
spring.datasource.url=jdbc:postgresql://localhost:5432/testdb
spring.datasource.driver-class-name=org.postgresql.Driver
spring.datasource.username=postgres
spring.datasource.password=postgres
spring.jpa.properties.hibernate.dialect=org.hibernate.dialect.PostgreSQL82Dialect
spring.jpa.hibernate.ddl-auto=update
docker-compose.yml:
version: "3"
services:
springapp:
build: .
container_name: springapp
environment:
SPRING_DATASOURCE_URL: jdbc:postgresql://db:5432/testdb
ports:
- 8000:8080
restart: always
depends_on:
- db
db:
image: postgres
container_name: db
environment:
- POSTGRES_USER=postgres
- POSTGRES_PASSWORD=postgres
- POSTGRES_DB=testdb
- PGDATA=/var/lib/postgresql/data/pgdata
ports:
- 5000:5432
volumes:
- pgdata:/var/lib/postgresql/data
restart: always
volumes:
pgdata:
For start spring application with local database we use url localhost.
For connect to container with database we need change 'localhost' on your database service, in my case 'localhost' to 'db'.
Solution: add SPRING_DATASOURCE_URL environment in docker-compose.yml wich rewrite spring.datasource.url value for connect:
environment:
SPRING_DATASOURCE_URL: jdbc:postgresql://db:5432/testdb
I hope this helps someone save his time.
You can use this.
version: "2"
services:
sample_db-postgresql:
image: postgres:9.5
ports:
- 5432:5432
environment:
- POSTGRES_PASSWORD=sample
- POSTGRES_USER=sample
- POSTGRES_DB=sample
volumes:
- sample_db:/var/lib/postgresql/data
volumes:
sample_db:
You can use ENV variable to change the db address in your docker-compose.
Dockerfile:
FROM java:8
EXPOSE 8080
ENV POSTGRES localhost
ADD /target/manager.jar manager.jar
ENTRYPOINT exec java $JAVA_OPTS -jar manager.jar --spring.datasource.url=jdbc:postgresql://$POSTGRES:5432/sample
docker-compose:
`
container_name: springapp
environment:
- POSTGRES=db`