docker 中 运行 时无法从 python 连接到 influxdb

Cannot connect from python to influxdb when running in docker

标题不完全准确,欢迎提出建议!

您可以在此处找到完整的 MCVE:https://github.com/timstoop/20170614-python-docker-influxdb-problem

测试:

因此 docker-compose 启动了一个 influxdb 和一个小型 python3 应用程序。该应用程序唯一做的就是尝试连接到 influxdb,运行 一个命令,如果失败,请等待 5 秒,然后重试。如果我 运行 docker-compose up 在此代码上,应用程序将永远不会连接,它会不断重试。这些是它输出的日志行:

app_1       | 2017-06-14 18:57:36.892955 ticker Trying InfluxDB connection...
app_1       | 2017-06-14 18:57:36.892977 ticker Influx host: 'influxdb'
app_1       | 2017-06-14 18:57:36.892984 ticker Influx port: 8086
app_1       | 2017-06-14 18:57:36.935112 ticker No InfluxDB connection yet. Waiting 5 seconds and retrying.

但是,如果我使用 docker exec -ti <container name> /bin/sh 在该特定容器中打开 shell,则以下工作正常:

/ # python3 -u
Python 3.6.1 (default, Jun  8 2017, 21:50:56) 
[GCC 6.3.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> from influxdb import InfluxDBClient
>>> ci = InfluxDBClient(host='influxdb')
>>> ci.get_list_database()
[{'name': '_internal'}]
>>>

我确定我忽略了一些愚蠢的东西,但我无法解释为什么 app.py 无法建立连接。因此,我无法修复该连接。如有任何建议,我们将不胜感激。

我的代码如下,供参考。

app.py:

#!/usr/bin/env python
from influxdb import InfluxDBClient
import datetime
import sys
import time
import os
import requests


def output(msg):
    # Convenience function to always show a correct output
    now = datetime.datetime.now()
    print("%s ticker %s" % (now, msg))


if __name__ == '__main__':
    # Gather our settings
    influx_host = os.getenv('INFLUX_HOST', 'localhost')
    influx_port = os.getenv('INFLUX_PORT', '8086')
    influx_user = os.getenv('INFLUX_USER', 'root')
    influx_pass = os.getenv('INFLUX_PASS', 'root')
    # Create our connections
    # Check to make sure we can create a connection
    got_if_connection = False
    while not got_if_connection:
        output('Trying InfluxDB connection...')
        output("Influx host: %s" % influx_host)
        output("Influx port: %s" % influx_port)
        influx_client = InfluxDBClient(host=influx_host, port=influx_port,
                                       username=influx_user,
                                       password=influx_pass)
        try:
            influx_client.get_list_database()
        except requests.exceptions.ConnectionError:
            output('No InfluxDB connection yet. Waiting 5 seconds and '+
                   'retrying.')
            time.sleep(5)
        else:
            got_if_connection = True

Docker 文件:

FROM python:alpine3.6
MAINTAINER Tim Stoop <tim@kumina.nl>

# Copy the script in
COPY app.py /app.py
COPY requirements.txt /requirements.txt

# Install dependencies
RUN pip install -r /requirements.txt


CMD ["python3", "-u", "/app.py"]

docker-compose.yml:

version: '2'
services:
  influxdb:
    image: "influxdb:alpine"
    ports:
      - "8086:8086"
  app:
    build: .
    links:
      - influxdb
    environment:
      - INFLUX_HOST='influxdb'

如果您需要任何其他信息,请告诉我!

从环境部分的 docker-compose.yml 文件中删除引号。

environment:
  - INFLUX_HOST=influxdb