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这是我的 docker-compose.yml的摘录：

version: '3.5'

services:

  traefik:
    image: "traefik:v2.4"
    command:
      - "--providers.docker=true"
      - "--providers.docker.exposedbydefault=false"
      - "--entrypoints.websecure.address=:443"
      - "--entrypoints.web.address=:80"
      - "--entrypoints.web.http.redirections.entryPoint.to=websecure"
      - "--entrypoints.web.http.redirections.entryPoint.scheme=https"
      - "--certificatesresolvers.leresolver.acme.tlschallenge=true"
      - "--certificatesresolvers.leresolver.acme.email=${TRAEFIK_EMAIL_CERT}"
      - "--certificatesresolvers.leresolver.acme.storage=/letsencrypt/acme.json"
      - "--api.dashboard=true"
      - "--entryPoints.web.forwardedHeaders.trustedIPs=127.0.0.1/32"
    labels:
      - "traefik.enable=true"
      - "traefik.http.routers.dashboard.rule=Host(`${TRAEFIK_FRONTEND_DOMAIN}`)"
      - "traefik.http.routers.dashboard.entrypoints=websecure"
      - "traefik.http.routers.dashboard.tls.certresolver=leresolver"
      - "traefik.http.routers.dashboard.service=api@internal"
    ports:
      - 80:80
      - 443:443
    volumes:
      - ./data/letsencrypt:/letsencrypt
      - /var/run/docker.sock:/var/run/docker.sock:ro
    restart: unless-stopped

  db_app:
    image: postgres:13.2
    volumes:
      - db_app:/var/lib/postgresql/data
    environment:
      POSTGRES_DB: app
      POSTGRES_USER: app
      POSTGRES_PASSWORD: app
    expose:
      - 5432
    restart: unless-stopped


  app_backend:
    image: registry.gitlab.com/mygroup/app/backend:latest
    environment:
      # ...
      SPRING_R2DBC_URL: r2dbc:postgresql://db_app:5432/app
      SPRING_R2DBC_USERNAME: app
      SPRING_R2DBC_PASSWORD: app
    expose:
      - 8080
    depends_on:
      - db_app
    restart: unless-stopped
    labels:
      - "traefik.enable=true"
      - "traefik.http.routers.app.rule=Host(`${APP_BACKEND_DOMAIN}`)"
      - "traefik.http.routers.app.entrypoints=websecure"
      - "traefik.http.routers.app.tls.certresolver=leresolver"
      - "traefik.http.routers.app.service=app-api"
      - "traefik.http.services.app-api.loadbalancer.server.port=8080"

并且在启动期间后端显示以下异常（但继续运行！）：

2021-07-28 22:01:53 Exception in thread "DefaultDispatcher-worker-1" org.springframework.dao.DataAccessResourceFailureException: Failed to obtain R2DBC Connection; nested exception is io.r2dbc.postgresql.PostgresqlConnectionFactory$PostgresConnectionException: Cannot connect to db_app:5432:5432
2021-07-28 22:01:53 at org.springframework.r2dbc.connection.ConnectionFactoryUtils.lambda$getConnection$0(ConnectionFactoryUtils.java:88)
2021-07-28 22:01:53 at reactor.core.publisher.Mono.lambda$onErrorMap$31(Mono.java:3488)
2021-07-28 22:01:53 at reactor.core.publisher.FluxOnErrorResume$ResumeSubscriber.onError(FluxOnErrorResume.java:94)
// ...
2021-07-28 22:01:53 at java.base/java.lang.Thread.run(Unknown Source)
2021-07-28 22:01:53 Caused by: io.r2dbc.postgresql.PostgresqlConnectionFactory$PostgresConnectionException: Cannot connect to db_app:5432:5432
2021-07-28 22:01:53 at io.r2dbc.postgresql.PostgresqlConnectionFactory.cannotConnect(PostgresqlConnectionFactory.java:218)
2021-07-28 22:01:53 at reactor.core.publisher.Mono.lambda$onErrorMap$31(Mono.java:3488)
2021-07-28 22:01:53 at reactor.core.publisher.FluxOnErrorResume$ResumeSubscriber.onError(FluxOnErrorResume.java:94)
2021-07-28 22:01:53 ... 101 more
2021-07-28 22:01:53 Caused by: java.net.UnknownHostException: db_app:5432: invalid IPv6 address
2021-07-28 22:01:53 at java.base/java.net.InetAddress.getAllByName(Unknown Source)
2021-07-28 22:01:53 at io.netty.util.internal.SocketUtils$9.run(SocketUtils.java:169)
// ...
2021-07-28 22:01:53 at reactor.core.publisher.MonoFlatMap$FlatMapMain.onNext(MonoFlatMap.java:125)
2021-07-28 22:01:53 ... 73 more

我特别想知道Cannot connect to db_app:5432:5432，因为端口似乎被添加了两次？有趣的是，当我在启动时为 flyway 迁移添加 jdbc 连接时，它工作正常并且迁移被执行：

SPRING_FLYWAY_URL: jdbc:postgresql://db_app:5432/app
SPRING_FLYWAY_USER: app
SPRING_FLYWAY_PASSWORD: app

当我将 R2DBC URI 更改为以下内容时，它可以正常工作：

SPRING_R2DBC_URL: r2dbc:postgresql://db_app/app

但我不明白为什么？所以，我的问题是添加“附加”端口的位置以及为什么行为与 JDBC 不同？

springBoot 版本 2.5.1

4

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