Question

标题不完全准确，我愿意接受建议！

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

经过测试：

docker-engine 17.05.0~ce-0~ubuntu-xenial
docker-compose版本1.13.0，build 1719ceb

所以docker-compose启动了一个Influxdb和一个小的python3应用程序。该应用程序唯一做的是尝试连接到Influxdb，运行命令，如果失败，请等待5秒再试一次。如果我在此代码上运行docker-compose up，该应用将永远不会连接，它会继续重试。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一个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'}]
>>>

我确定我忽视了一些愚蠢的事情，但我无法解释为什么app.py不能建立联系。因此，我无法修复这种联系。任何建议都将非常感谢。

我的代码供参考，如下所示。

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

Dockerfile：

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"]

搬运工-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，请与我们联系！

Answer 1

从环境部分的docker-compose.yml文件中删除引号。

environment:
  - INFLUX_HOST=influxdb

在docker

1 个答案: