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Unable to connect to Centrifugo on localhost:8000 (only works on container IP) #2708

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alexc-hollywood opened this issue Sep 15, 2020 · 1 comment
Closed

Unable to connect to Centrifugo on localhost:8000 (only works on container IP) #2708

alexc-hollywood opened this issue Sep 15, 2020 · 1 comment
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Type: Bug

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@alexc-hollywood
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Description:

Adding container image for Centrifugo exposes the service on the container IP, but not localhost.

Within docker-compose.yml:

### CENTRIFUGO ###################################################
# https://centrifugal.github.io/centrifugo/server/configuration/#configuration-ways
    centrifugo:
      container_name: centrifugo
      image: centrifugo/centrifugo:latest
      restart: always
      environment:
        - CENTRIFUGO_ADDRESS=0.0.0.0
        - CENTRIFUGO_ENGINE=memory
        - CENTRIFUGO_ADMIN=true
        - CENTRIFUGO_TOKEN_HMAC_SECRET_KEY=secret
        - CENTRIFUGO_ADMIN_PASSWORD=password
        - CENTRIFUGO_ADMIN_SECRET=secret
        - CENTRIFUGO_API_KEY=centrifugo_spi_client
        - CENTRIFUGO_V3_USE_OFFSET=true
        - CENTRIFUGO_LOG_LEVEL=debug
        - CENTRIFUGO_CLIENT_CHANNEL_LIMIT=128
        - CENTRIFUGO_CHANNEL_MAX_LENGTH=255
        - CENTRIFUGO_CLIENT_REQUEST_MAX_SIZE=65536
        - CENTRIFUGO_CLIENT_QUEUE_MAX_SIZE=10485760
        - CENTRIFUGO_CLIENT_ANONYMOUS=FALSE
        - CENTRIFUGO_SOCKJS_HEARTBEAT_DELAY=25
        - CENTRIFUGO_WEBSOCKET_COMPRESSION=FALSE
        - CENTRIFUGO_GOMAXPROCS=0
        - CENTRIFUGO_WEBSOCKET_HANDLER_PREFIX="/connection/websocket"
        - CENTRIFUGO_SOCKJS_HANDLER_PREFIX="/connection/sockjs"
        - CENTRIFUGO_API_HANDLER_PREFIX="/api"
        - CENTRIFUGO_PROMETHEUS_HANDLER_PREFIX="/metrics"
        - CENTRIFUGO_HEALTH_HANDLER_PREFIX="/health"
      ports:
        - "8569:8000"
      command: centrifugo --admin --health
      networks:
        - backend

Launch:

docker-compose up -d --force-recreate centrifugo
Recreating centrifugo ... 
Recreating centrifugo ... done

docker ps
CONTAINER ID        IMAGE                          COMMAND                  CREATED             STATUS              PORTS                    NAMES
db068814eff6        centrifugo/centrifugo:latest   "centrifugo --admin …"   12 minutes ago      Up 12 minutes       0.0.0.0:8569->8000/tcp   centrifugo

Trying to connect:

curl -X GET http://127.0.0.1:8000
curl: (7) Failed to connect to 127.0.0.1 port 8000: Connection refused

However, check the internal private container IP and it works:

curl -X GET http://172.22.0.2:8000
<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <meta http-equiv="Cache-Control" content="no-cache, no-store, must-revalidate" />
    <title>Centrifugo admin panel</title>
    <link rel="shortcut icon" href="favicon.png" type="image/x-icon" />
    <link href="https://use.fontawesome.com/releases/v5.6.3/css/all.css" rel="stylesheet" />
<link rel="shortcut icon" href="favicon.png"><link href="styles.css?2784449a7d3509c03bf4" rel="stylesheet"></head>

<body>
    <div id="app"></div>
<script type="text/javascript" src="bundle.js?2784449a7d3509c03bf4"></script></body>

</html>

Expected Behavior:

Able to successfully connect to http://localhost:8000 in browser.

Context information:

Output of git rev-parse HEAD

ade6f6b1a79fbe87f971d1021a9e5e1ee57a0fd3

Output of docker version

Client: Docker Engine - Community
 Version:           19.03.12
 API version:       1.40
 Go version:        go1.13.10
 Git commit:        48a66213fe
 Built:             Mon Jun 22 15:45:36 2020
 OS/Arch:           linux/amd64
 Experimental:      false

Server: Docker Engine - Community
 Engine:
  Version:          19.03.12
  API version:      1.40 (minimum version 1.12)
  Go version:       go1.13.10
  Git commit:       48a66213fe
  Built:            Mon Jun 22 15:44:07 2020
  OS/Arch:          linux/amd64
  Experimental:     false
 containerd:
  Version:          1.2.13
  GitCommit:        7ad184331fa3e55e52b890ea95e65ba581ae3429
 runc:
  Version:          1.0.0-rc10
  GitCommit:        dc9208a3303feef5b3839f4323d9beb36df0a9dd
 docker-init:
  Version:          0.18.0
  GitCommit:        fec3683

Output of docker-compose version

docker-compose version 1.17.1, build unknown
docker-py version: 2.5.1
CPython version: 2.7.17
OpenSSL version: OpenSSL 1.1.1g  21 Apr 2020

System info: Mac, Windows or Linux. Include which disto/version

Ubuntu 18 Bionic

Steps to reproduce the issue:

  1. Add above config to docker-compose.yml
  2. Run docker-compose up -d --force-recreate centrifugo
  3. Visit http://localhost:8000
  4. Get container private IP, visit http://container-ip:8000

Stacktrace & Additional info:

docker-compose logs centrifugo
Attaching to centrifugo
centrifugo             | {"level":"info","version":"2.6.2","runtime":"go1.14.7","pid":1,"engine":"Memory","gomaxprocs":4,"time":"2020-09-15T01:32:06Z","message":"starting Centrifugo"}
centrifugo             | {"level":"info","path":"/centrifugo/config.json","time":"2020-09-15T01:32:06Z","message":"using config file"}
centrifugo             | {"level":"warn","time":"2020-09-15T01:32:06Z","message":"config file not found"}
centrifugo             | {"level":"info","time":"2020-09-15T01:32:06Z","message":"serving websocket, SockJS, API, admin, health endpoints on 0.0.0.0:8000"}
@alexc-hollywood
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Closing this. Fixed by changing the port relay, which is in the format docker-host : container host

Changed to:

      ports:
        - "8000:8000"

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@alexc-hollywood