No connection between gateway and eureka

[paris0120]

Overview of the issue

It seems that the gateway server cannot connect to the Eureka server out of jdl generator.

Motivation for or Use Case

Generate microservice with gateway and microservice

Reproduce the error

Generated a gateway server and microservice server.
Started gateway server with docker-compose -f src/main/docker/app.yml up

I got

ERROR 1 --- [tbeatExecutor-0] com.netflix.discovery.DiscoveryClient : DiscoveryClient_GATEWAY/gateway:139fa15be5b04239ff7a0dd2a823ac7e - was unable to send heartbeat!

Also, Eureka doesn't list the gateway server.

If I start a microservice with mvn, the Eureka can show the microservice but not the gateway. Also if I try to accesss the API of microservice from the gate server I get

{"type":"https://www.jhipster.tech/problem/problem-with-message","title":"Unauthorized","status":401,"detail":"Not Authenticated","path":"/api/issues","message":"error.http.401"}

The following is my app.yml

This configuration is intended for development purpose, it's your responsibility to harden it for production

version: '3.8' services: gateway-app: image: gateway environment:

• _JAVA_OPTIONS=-Xmx512m -Xms256m
• SPRING_PROFILES_ACTIVE=prod,api-docs
• MANAGEMENT_METRICS_EXPORT_PROMETHEUS_ENABLED=true
• EUREKA_CLIENT_SERVICE_URL_DEFAULTZONE=http://admin:$${jhipster.registry.password}@jhipster-registry:8761/eureka
• SPRING_CLOUD_CONFIG_URI=http://admin:$${jhipster.registry.password}@jhipster-registry:8761/config
• SPRING_R2DBC_URL=r2dbc:mysql://gateway-mysql:3306/gateway?useUnicode=true&characterEncoding=utf8&useSSL=false&useLegacyDatetimeCode=false&serverTimezone=UTC&createDatabaseIfNotExist=true
• SPRING_LIQUIBASE_URL=jdbc:mysql://gateway-mysql:3306/gateway?useUnicode=true&characterEncoding=utf8&useSSL=false&useLegacyDatetimeCode=false&serverTimezone=UTC&createDatabaseIfNotExist=true
• SPRING_SECURITY_OAUTH2_CLIENT_PROVIDER_OIDC_ISSUER_URI=http://keycloak:9080/auth/realms/jhipster
• SPRING_SECURITY_OAUTH2_CLIENT_REGISTRATION_OIDC_CLIENT_ID=web_app
• SPRING_SECURITY_OAUTH2_CLIENT_REGISTRATION_OIDC_CLIENT_SECRET=web_app
• JHIPSTER_SLEEP=60 # gives time for microservices to boot before the gateway, the entire stack will be ready to accept incomming requests.
• SPRING_ELASTICSEARCH_URIS=http://gateway-elasticsearch:9200

  If you want to expose these ports outside your dev PC,

  remove the "127.0.0.1:" prefix

  ports:

• 127.0.0.1:8080:8080 gateway-mysql: image: mysql:8.0.28

  volumes:

  - ~/volumes/jhipster/gateway/mysql/:/var/lib/mysql/

  environment:

• MYSQL_ALLOW_EMPTY_PASSWORD=yes
• MYSQL_DATABASE=gateway

  If you want to expose these ports outside your dev PC,

  remove the "127.0.0.1:" prefix

  ports:

• 127.0.0.1:3306:3306 command: mysqld --lower_case_table_names=1 --skip-ssl --character_set_server=utf8mb4 --explicit_defaults_for_timestamp gateway-elasticsearch: image: docker.elastic.co/elasticsearch/elasticsearch:7.15.2

  volumes:

  - ~/volumes/jhipster/gateway/elasticsearch/:/usr/share/elasticsearch/data/

  If you want to expose these ports outside your dev PC,

  remove the "127.0.0.1:" prefix

  ports:

• 127.0.0.1:9200:9200
• 127.0.0.1:9300:9300 environment:
• 'ES_JAVA_OPTS=-Xms1024m -Xmx1024m'
• 'discovery.type=single-node' jhipster-registry: image: jhipster/jhipster-registry:v7.3.0 volumes:
• ./central-server-config:/central-config

  When run with the "dev" Spring profile, the JHipster Registry will

  read the config from the local filesystem (central-server-config directory)

  When run with the "prod" Spring profile, it will read the configuration from a Git repository

  See https://www.jhipster.tech/jhipster-registry/#spring-cloud-config

  environment:

• JHIPSTER_SLEEP=20
• _JAVA_OPTIONS=-Xmx512m -Xms256m
• SPRING_PROFILES_ACTIVE=dev,api-docs,oauth2
• SPRING_SECURITY_USER_PASSWORD=admin
• JHIPSTER_REGISTRY_PASSWORD=admin
• SPRING_CLOUD_CONFIG_SERVER_COMPOSITE_0_TYPE=native
• SPRING_CLOUD_CONFIG_SERVER_COMPOSITE_0_SEARCH_LOCATIONS=file:./central-config/localhost-config/

  - SPRING_CLOUD_CONFIG_SERVER_COMPOSITE_0_TYPE=git

  - SPRING_CLOUD_CONFIG_SERVER_COMPOSITE_0_URI=https://github.com/jhipster/jhipster-registry/

  - SPRING_CLOUD_CONFIG_SERVER_COMPOSITE_0_SEARCH_PATHS=central-config

  For keycloak to work, you need to add '127.0.0.1 keycloak' to your hosts file

• SPRING_SECURITY_OAUTH2_CLIENT_PROVIDER_OIDC_ISSUER_URI=http://keycloak:9080/auth/realms/jhipster
• SPRING_SECURITY_OAUTH2_CLIENT_REGISTRATION_OIDC_CLIENT_ID=jhipster-registry
• SPRING_SECURITY_OAUTH2_CLIENT_REGISTRATION_OIDC_CLIENT_SECRET=jhipster-registry

  If you want to expose these ports outside your dev PC,

  remove the "127.0.0.1:" prefix

  ports:

• 127.0.0.1:8761:8761 keycloak: image: jboss/keycloak:16.1.0 command: [ '-b', '0.0.0.0', '-Dkeycloak.migration.action=import', '-Dkeycloak.migration.provider=dir', '-Dkeycloak.migration.dir=/opt/jboss/keycloak/realm-config', '-Dkeycloak.migration.strategy=OVERWRITE_EXISTING', '-Djboss.socket.binding.port-offset=1000', '-Dkeycloak.profile.feature.upload_scripts=enabled', ] volumes:
• ./realm-config:/opt/jboss/keycloak/realm-config environment:
• KEYCLOAK_USER=admin
• KEYCLOAK_PASSWORD=admin
• DB_VENDOR=h2

  If you want to expose these ports outside your dev PC,

  remove the "127.0.0.1:" prefix

  ports:

• 127.0.0.1:9080:9080
• 127.0.0.1:9443:9443
• 127.0.0.1:10990:10990

Related issues

Suggest a Fix

JHipster Version(s)

JHipster configuration

Entity configuration(s) entityName.json files generated in the .jhipster directory

Browsers and Operating System

• [ ] Checking this box is mandatory (this is just to show you read everything)

[vishal423]

Can you try changing localhost-config with docker-config in this line and try? - SPRING_CLOUD_CONFIG_SERVER_COMPOSITE_0_SEARCH_LOCATIONS=file:./central-config/localhost-config/

[paris0120]

Can you try changing localhost-config with docker-config in this line and try? - SPRING_CLOUD_CONFIG_SERVER_COMPOSITE_0_SEARCH_LOCATIONS=file:./central-config/localhost-config/

The dock image works now but other microservice can't connect to Eureka now. I get the following message with microservice.

Request execution error. endpoint=DefaultEndpoint{ serviceUrl='http://admin:admin@jhipster-registry:8761/eureka/}, exception=I/O error on GET request for "http://admin:admin@jhipster-registry:8761/eureka/apps/": No such host is known (jhipster-registry); nested exception is java.net.UnknownHostException: No such host is known (jhipster-registry) stacktrace=org.springframework.web.client.ResourceAccessException: I/O error on GET request for "http://admin:admin@jhipster-registry:8761/eureka/apps/": No such host is known (jhipster-registry); nested exception is java.net.UnknownHostException: No such host is known (jhipster-registry)

[vishal423]

You can try adding an entry into your hosts config to map jhipster-registry with 127.0.0.1 for micro-services connection issue.

[DanielFran]

Closing, since doubts have been answered