Develop Reference

Java Application can not connect to redis when running on docker

I have the following docker compose file:
GNU nano 6.2 docker-compose.yml
version: '3'
services:
urgent-fury-pre-prod:
image: leonhard8/urgent-fury:latest
depends_on:
- redis
restart: always
ports:
- '1:1'
networks:
- external
environment:
stage: "pre-prod"
deploy:
replicas: 1
restart_policy:
condition: on-failure
redis:
image: "redis:alpine"
restart: always
ports:
- '6379:6379'
networks:
- external
networks:
external:
external: true
I use Redis using Java Jedis.
final Jedis jedis = new Jedis();
However everytime I try to run docker-compose the connection times out.
Google the issue
Ask ChatGPT multiple times
Read the docker documentation

Spring-boot application gets stuck on startup randomly

Spring-boot application gets stuck on startup randomly at:
The postgres gets started then it gets stuck.
Only one log from the Java application is:
Listening for transport dt_socket at address: 8000
It's a brand new application. I am using spring-boot 2.6.6, Spring 5.3.18, JDK 17, and Hibernate 5.6.7.Final with docker-compose.
Here is my docker-compose.yml
version: '3.7'
services:
postgres:
image: postgis:11-alpine
command: postgres -c stats_temp_directory=/tmp
ports:
- 5432:5432
environment:
- POSTGRES_PASSWORD=password!
- POSTGRES_USER=xxx
- POSTGRES_DB=xxx
volumes:
- ./postgres-data:/var/lib/postgresql/data
networks:
xxx-network:
fargate-xxx:
depends_on:
- postgres
links:
- postgres:postgres
image: fargate-xxx-local-build
build:
context: ""
dockerfile: Dockerfile
ports:
- 8080:8080
- 8000:8000
networks:
xxx-network:
dns:
- 8.8.8.8
- 8.8.4.4
environment:
ENVIRONMENT: ${ENVIRONMENT}
JAVA_OPTS: -Xdebug -Xrunjdwp:transport=dt_socket,address=8000,server=y,suspend=n
volumes:
- ./dynamicconfig.properties:/tmp/dynamicconfig.properties
volumes: {}
networks:
xxx-network:
driver: bridge
Dockerfile
FROM amazoncorretto:17-alpine
EXPOSE 8000
COPY app.jar app.jar
ENTRYPOINT exec java ${JAVA_OPTS} -jar app.jar
BTW, I'm on M1.

Docker doesn't save permanently files, which create my java app

My java app (backend) create some files during work. And when i make rebuild after some changes, this file deletes and my app need to create it again. How to save this files permanently? I try to create volume but it doesn't work.
This is my docker-compose config:
version: '3'
services:
examledb:
container_name: examle-docker-db
image: postgres
volumes:
- examle-docker-db:/var/lib/postgresql/data
ports:
- "5555:5432"
expose:
- "5555"
environment:
- POSTGRES_PASSWORD=password
- POSTGRES_USER=postgres
- POSTGRES_DB=examle
- PGDATA=/var/lib/postgresql/data/pgdata
networks:
- examle-docker-network
restart: unless-stopped
backend:
container_name: examle-docker-backend
build: ./backend
volumes:
- /var/lib/docker/volumes/example_prod_example-backend-volume/_data:/root/projects/example_PROD/backend
ports:
- "8080:8080"
- "8888:8888"
depends_on:
- examledb
networks:
- examle-docker-network
environment:
SPRING_DATASOURCE_URL: jdbc:postgresql://examle-docker-db:5432/examle
restart: unless-stopped
frontend:
container_name: examle-docker-frontend
build: ./frontend
restart: unless-stopped
command: serve -s dist/vu4y-frontend -l 4200
networks:
- examle-docker-network
nginx:
image: nginx:stable
container_name: examle-docker-nginx
ports:
- "80:80"
- "443:443"
volumes:
- ./data/nginx:/etc/nginx/conf.d
- ./data/certbot/conf:/etc/letsencrypt
- ./data/certbot/www:/var/www/certbot
depends_on:
- frontend
- backend
networks:
- examle-docker-network
command: "/bin/sh -c 'while :; do sleep 6h & wait $${!}; nginx -s reload; done & nginx -g \"daemon off;\"'"
certbot:
image: certbot/certbot
restart: unless-stopped
volumes:
- ./data/certbot/conf:/etc/letsencrypt
- ./data/certbot/www:/var/www/certbot
networks:
- examle-docker-network
entrypoint: "/bin/sh -c 'trap exit TERM; while :; do certbot renew; sleep 12h & wait $${!}; done;'"
volumes:
examle-docker-db: { }
networks:
examle-docker-network:
driver: bridge
Also I try to create volume like this:
volumes:
- example-backend-volume:/root/projects/example_PROD/backend
It also doesn't work.
My docker-compose.yml layout in /root/projects/Example
Any advice will be very helpful. All files creates inside backend folder in the same category with src and pom.xml.

I solved the problem. My problem was that I don't understand how docker's volume works. I thought that need to write root where my docker app is run, but need to write any path in right path (in my case /root/projects/example_PROD/backend) and saves files in app there.

Zuul Load Balancer

So I have little problem here. I have 4 module:
Eureka Server
Zuul Gateway
Authentication Service
Another MicroService
When I starting it on a local computer it doesn't show any problem like
Caused by: com.netflix.client.ClientException: Load balancer does not have available server for client: authentication-service
But when I started building it on docker it's always getting error like that. Can you tell me the part that I'm wrong?
eureka server properties
spring.application.name=bms-server
# default port for eureka server
server.port=8761
eureka.instance.hostname=bms-server
# eureka by default will register itself as a client. So, we need to set it to false.
# What's a client server? See other microservices (student, auth, etc).
eureka.client.register-with-eureka=false
eureka.client.fetch-registry=false
Zuul Server properties
server.port=8762
spring.application.name=bms-api-gateway
eureka.client.fetch-registry=true
eureka.client.service-url.defaultZone=http://bms-server:8761/eureka/
zuul.ignored-services=*
zuul.routes.authentication-service.path=/auth/**
zuul.routes.authentication-service.service-id=authentication-service
zuul.routes.general-setup-service.path=/general-setup/**
zuul.routes.general-setup-service.service-id=general-setup-service
zuul.routes.authentication-service.strip-prefix=false
zuul.routes.authentication-service.sensitive-headers=Cookie,Set-Cookie
zuul.retryable=true
zuul.ignored-headers=Access-Control-Allow-Credentials, Access-Control-Allow-Origin
ribbon.eureka.enabled=false
ribbon.ConnectTimeout=60000
ribbon.ReadTimeout=60000
hystrix.command.default.execution.enabled=false
hystrix.command.default.execution.isolation.strategy=THREAD
hystrix.command.default.execution.isolation.thread.timeoutInMilliseconds=240000
Authentication service properties
spring.application.name=authentication-service
server.port=9100
eureka.client.service-url.defaultZone=http://bms-server:8761/eureka/
authentication-service.ribbon.listOfServers=http://localhost:9100
spring.cloud.loadbalancer.ribbon.enabled=false
this is my Another service properties
spring.application.name=authentication-service
server.port=9100
eureka.client.service-url.defaultZone=http://bms-server:8761/eureka/
general-setup-service.ribbon.listOfServers=http://localhost:9100
spring.cloud.loadbalancer.ribbon.enabled=false
And last this is my docker-compose.yml
version: '3.5'
services:
bms-server:
image: bms-server:v1
container_name: bms-server
hostname: bms-server
build:
context: ./bms-server
dockerfile: Dockerfile
volumes:
- maven-home:/root/.m2
ports:
- "8761:8761"
networks:
- bms-network
bms-api-gateway:
image: bms-api-gateway:v1
container_name: bms-api-gateway
build:
context: ./bms-api-gateway
dockerfile: Dockerfile
ports:
- "8762:8762"
depends_on:
- bms-server
volumes:
- maven-home:/root/.m2
links:
- bms-server:bms-server
hostname: bms-api-gateway
networks:
- bms-network
bms-authentication-service:
image: bms-authentication-service:v1
container_name: bms-authentication-service
build:
context: ./bms-authentication-service
dockerfile: Dockerfile
ports:
- "9100:9100"
volumes:
- maven-home:/root/.m2
depends_on:
- bms-server
links:
- bms-server:bms-server
hostname: authentication-service
networks:
- bms-network
bms-general-setup-service:
image: bms-general-setup-service:v1
container_name: bms-general-setup-service
build:
context: ./bms-general-setup-service
dockerfile: Dockerfile
ports:
- "9102:9102"
depends_on:
- bms-server
links:
- bms-server:bms-server
volumes:
- maven-home:/root/.m2
hostname: general-setup-service
networks:
- bms-network
volumes:
maven-home:
networks:
bms-network:
name: bms-network
driver: bridge
Please tell me the part that I'm wrong. Thank you very much.

API-gateway never getting config from config server when both are run with docker compose

I have three services.
Config server
Eureka server
api-gateway
If I run them individually it's working fine. Then I am trying to introduce docker on above services. So I have prepare 3 dockerfile for each services:
VOLUME /tmp
ADD config-server/build/libs/config-server-0.0.1-SNAPSHOT.jar config-server-0.0.1-SNAPSHOT.jar
CMD ["java", "-jar", "config-server-0.0.1-SNAPSHOT.jar"]
VOLUME /var/lib/config-repo
EXPOSE 10270
FROM java:8
VOLUME /tmp
ADD eureka-server/build/libs/eureka-server-1.0-SNAPSHOT.jar eureka-server-1.0-SNAPSHOT.jar
CMD ["java","-jar","eureka-server-1.0-SNAPSHOT.jar"]
EXPOSE 10210
FROM java:8
VOLUME /tmp
ADD api-gateway/build/libs/api-gateway-0.0.1-SNAPSHOT.jar api-gateway-0.0.1-SNAPSHOT.jar
RUN bash -c 'touch /api-gateway-0.0.1-SNAPSHOT.jar'
ENTRYPOINT ["java","-Djava.security.egd=file:/dev/./urandom","-jar","/api-gateway-0.0.1-SNAPSHOT.jar"]
And then I have prepared my docker-compose file:
version: '3'
services:
eureka-server:
restart: always
container_name: eureka-server
build:
context: .
dockerfile: eureka-server/Dockerfile_eureka_server
expose:
- 10210
ports:
- 10210:10210
networks:
- servicenet
config-server:
restart: always
container_name: config-server
build:
context: .
dockerfile: config-server/Dockerfile_config_server
expose:
- 10270
ports:
- 10270:10270
healthcheck:
test: ["CMD", "curl", "-f", "http://config-server:10270"]
interval: 30s
timeout: 10s
retries: 5
networks:
- servicenet
api-gateway:
restart: on-failure
container_name: api-gateway
build:
context: .
dockerfile: api-gateway/Dockerfile_api_gateway
expose:
- 10200
ports:
- 10200:10200
networks:
- servicenet
links:
- config-server
- eureka-server
networks:
servicenet:
driver: bridge
But api-gateway start before config-server completely start its service. Thats why api gateway start on 8080 port and looking for eureka server at host localhost and port 8621. though its not getting this ports and hosts in docker its continuing looking for eureka server but not again fetching config from config server. Is there anything wrong with my configuration?
My application.properties file on github like this
server.port=10200
#Eureka configuration
eureka.instance.metadataMap.instanceId=${vcap.application.instance_id:${spring.application.name}:${spring.application.instance_id:${random.value}}}
lombok.equalsAndHashCode.callSuper = call
eureka.instance.instanceId=${spring.application.name}:${spring.application.instance_id:${random.value}}
eureka.client.registryFetchIntervalSeconds=5
eureka.client.serviceUrl.defaultZone=http://eureka-server:10210/eureka
spring.cloud.service-registry.auto-registration.enabled=true
eureka.client.enabled=true
eureka.client.serviceUrl.registerWithEureka=true
lombok.anyConstructor.suppressConstructorProperties = true
#Zuul Configuration
# A prefix that can added to beginning of all requests.
#zuul.prefix=/api
# Disable accessing services using service name (i.e. gallery-service).
# They should be only accessed through the path defined below.
zuul.ignored-services=*
# Map paths to services
zuul.routes.gallery-service.path=/gallery/**
zuul.routes.gallery-service.service-id=gallery-manager
zuul.routes.image-service.path=/image/**
zuul.routes.image-service.service-id=image-service
zuul.routes.book-manager.path=/book-manager/**
zuul.routes.book-manager.service-id=book-manager
zuul.routes.auth-service.path=/auth/**
zuul.routes.auth-service.service-id=auth-manager
zuul.routes.remote-library.path=/remote/**
zuul.routes.remote-library.service-id=remote-library
#zuul.routes.auth-service.strip-prefix=false
# Exclude authorization from sensitive headers
zuul.routes.auth-service.sensitive-headers=Cookie,Set-Cookie
NB: If I try with other services rather than api-gateway its working fine. I am using zuul proxy for api gateway service.

A quick fix would be to add a 'depends_on' clause so that the api-service depends on the config server - that way the api-service won't start until the config server is up.

To make this workable we have to wait still other services are up. So I have written a script for waiting and rewrite docker compose like this
version: '3'
services:
eureka-server:
restart: always
container_name: eureka-server
build:
context: .
dockerfile: eureka-server/Dockerfile_eureka_server
expose:
- 10210
ports:
- 10210:10210
networks:
- servicenet
config-server:
restart: always
container_name: config-server
build:
context: .
dockerfile: config-server/Dockerfile_config_server
expose:
- 10270
ports:
- 10270:10270
healthcheck:
test: ["CMD", "curl", "-f", "http://config-server:10270"]
interval: 30s
timeout: 10s
retries: 5
networks:
- servicenet
api-gateway:
restart: always
container_name: api-gateway
build:
context: .
dockerfile: api-gateway/Dockerfile_api_gateway
expose:
- 10200
ports:
- 10200:10200
networks:
- servicenet
links:
- config-server
depends_on:
- config-server
command: ["./wait-for-it.sh", "config-server:10270","--","./wait-for-it.sh", "eureka-server:10210", "--", "java","-jar", "api-gateway-0.0.1-SNAPSHOT.jar"]
And also rewrite docker files like this(for api-gateway)
FROM java:8
VOLUME /tmp
ADD api-gateway/build/libs/api-gateway-0.0.1-SNAPSHOT.jar api-gateway-0.0.1-SNAPSHOT.jar
ADD wait-for-it.sh wait-for-it.sh
RUN chmod +x wait-for-it.sh