Docker Compose - Postgres/Postgis

Question

我创建了一个组合的 docker 镜像，它基于以下组件

version: "3"
services:
  db:
    image: kartoza/postgis:14-3.2
    environment:
      - POSTGRES_DB=AAAAAAAA
      - POSTGRES_USER=BBBBBBBBBB
      - POSTGRES_PASS=CCCCCCCCCC
      - POSTGRES_MULTIPLE_EXTENSIONS=postgis,postgis_raster
    ports:
      - "5432:5432"
    restart: on-failure
    healthcheck:
      test: "exit 0"
  shiny:
    container_name: shiny
    build: ./webapp4
    ports:
      - "8787:8787"
    depends_on:
      - "db"

一切顺利并投入运行。

但是当闪亮的应用程序尝试使用以下代码连接数据库时

remote_conn <- dbConnect(RPostgres::Postgres(),
                         dbname = "AAAAAAAA",
                         host="localhost",
                         port="5432",
                         user="BBBBBBBBBB",
                         password="CCCCCCCCCC")

我有以下输出

Warning: Error in : could not connect to server: Connection refused
        Is the server running on host "localhost" (127.0.0.1) and accepting
        TCP/IP connections on port 5432?
could not connect to server: Cannot assign requested address
        Is the server running on host "localhost" (::1) and accepting
        TCP/IP connections on port 5432?

  55: <Anonymous>
  54: stop
  53: connection_create
  52: .local
  51: dbConnect
  49: server
   3: runApp
   2: print.shiny.appobj
   1: <Anonymous>
Error : could not connect to server: Connection refused
        Is the server running on host "localhost" (127.0.0.1) and accepting
        TCP/IP connections on port 5432?
could not connect to server: Cannot assign requested address
        Is the server running on host "localhost" (::1) and accepting
        TCP/IP connections on port 5432?

有人可以解释一下如何解决这个问题吗？

Answer 1

您是否尝试过向两个容器添加相同的网络？ 只需定义网络，然后将网络名称添加到两个容器，连接时确保使用服务名称作为主机参数，在您的情况下，它是

host =“db”，而不是host =“localhost”

有关示例，请参见 https://github.com/Tornike-Skhulukhia/postgres-to-mongo-importer/blob/main/docker-compose.yml