我正在 kubernetes pod 内的 docker 容器上运行 python 脚本，我的脚本是一个 mqtt 脚本，当我接收消息时，它会打印出该消息（我希望将来能够保存它或发送它）到另一个.txt）。 现在我的日志中没有收到任何输出，这是为什么？ 我正在获取输出，但只是关于客户端连接、新客户端连接等。我想获取消息，现在我只是发送“hello”，如果我在终端 mosquitto_pub/mosquitto_sub 中这样做，我就会收到此 mqtt 消息，但不是在 pod 脚本的输出上。谢谢你:)
Dockerfile：
FROM docker.deere.com/python:3.8-slim
RUN pip install paho-mqtt
COPY subscriber.py /subscriber.py
CMD ["python", "./subscriber.py"]
Kubernetes部署： api版本：apps/v1 种类：部署 元数据： 名称： 蚊子经纪人 规格： 副本：1 选择器： 匹配标签： 应用程序：MQTT经纪人 模板： 元数据： 标签： 应用程序：MQTT经纪人 规格： 容器： - 名称：mqtt-broker-init 图片：我的蚊子：最新 端口： - 集装箱港口：1883 - 名称：mqtt-subs 图片：mosquitto-subscriber：最新
python脚本：
import paho.mqtt.client as mqtt
def on_connect(client, userdata, flags, rc):
print("Connected with result code " + str(rc))
client.subscribe("test/topic")
def on_message(client, userdata, msg):
print("Received message: " + msg.payload.decode())
client = mqtt.Client(mqtt.CallbackAPIVersion.VERSION1, "SubscriberTest")
client.on_connect = on_connect
client.on_message = on_message
client.connect("172.30.0.130", 30988, 60)
client.loop_forever()
pod 输出：
❯ kubectl logs deployment/mosquitto-broker
Found 4 pods, using pod/mqtt-broker-68c7545bc8-4fs86
Defaulted container "mqtt-broker" out of: mqtt-broker, mosquitto-subs
1708114383: mosquitto version 2.0.18 starting
1708114383: Config loaded from /mosquitto/config/mosquitto.conf.
1708114383: Opening ipv4 listen socket on port 1883.
1708114383: Opening ipv6 listen socket on port 1883.
1708114383: mosquitto version 2.0.18 running
1708114429: New connection from 10.244.0.1:32866 on port 1883.
1708114429: New client connected from 10.244.0.1:32866 as SubscriberTest (p2, c1, k60).
1708114471: New connection from 10.244.0.1:23628 on port 1883.
1708114471: New client connected from 10.244.0.1:23628 as auto-8F54FBAD-6D14-FBB1-6C0B-9E9A5E6101AB (p2, c1, k60).
1708114471: Client auto-8F54FBAD-6D14-FBB1-6C0B-9E9A5E6101AB disconnected.
1708114474: New connection from 10.244.0.1:14961 on port 1883.
1708114474: Client SubscriberTest already connected, closing old connection.
1708114474: New client connected from 10.244.0.1:14961 as SubscriberTest (p2, c1, k60).
1708114475: New connection from 10.244.0.1:18285 on port 1883.
1708114475: Client SubscriberTest already connected, closing old connection.
1708114475: New client connected from 10.244.0.1:18285 as SubscriberTest (p2, c1, k60).
1708114476: New connection from 10.244.0.1:11965 on port 1883.
1708114476: Client SubscriberTest already connected, closing old connection.
1708114476: New client connected from 10.244.0.1:11965 as SubscriberTest (p2, c1, k60).
1708114477: New connection from 10.244.0.1:50342 on port 1883.
1708114477: Client SubscriberTest already connected, closing old connection.
1708114477: New client connected from 10.244.0.1:50342 as SubscriberTest (p2, c1, k60).
1708114604: New connection from 10.244.0.1:48118 on port 1883.
1708114604: New client connected from 10.244.0.1:48118 as auto-6CE6C67F-7CC7-53BD-2627-F3A483F7E774 (p2, c1, k60).
1708114604: Client auto-6CE6C67F-7CC7-53BD-2627-F3A483F7E774 disconnected.
1708115507: New connection from 10.244.0.1:33888 on port 1883.
1708115507: Client SubscriberTest already connected, closing old connection.
1708115507: New client connected from 10.244.0.1:33888 as SubscriberTest (p2, c1, k60).
1708115512: New connection from 10.244.0.1:60569 on port 1883.
1708115512: Client SubscriberTest already connected, closing old connection.
1708115512: New client connected from 10.244.0.1:60569 as SubscriberTest (p2, c1, k60).
1708115565: New connection from 10.244.0.1:14096 on port 1883.
1708115565: New client connected from 10.244.0.1:14096 as auto-451A6E10-1B48-73E8-5BA8-A7606A5D4AC9 (p2, c1, k60).
1708115565: Client auto-451A6E10-1B48-73E8-5BA8-A7606A5D4AC9 disconnected.
1708115567: New connection from 10.244.0.1:15433 on port 1883.
1708115567: New client connected from 10.244.0.1:15433 as auto-3B09DB6C-5735-EEF5-2F17-279A7221E179 (p2, c1, k60).
1708115567: Client auto-3B09DB6C-5735-EEF5-2F17-279A7221E179 disconnected.
1708115929: New connection from 10.244.0.1:23931 on port 1883.
1708115929: New client connected from 10.244.0.1:23931 as auto-7ECB485C-F10A-3DB3-9CB4-DF4F481EFF46 (p2, c1, k60).
1708115929: Client auto-7ECB485C-F10A-3DB3-9CB4-DF4F481EFF46 disconnected.
1708115939: New connection from 10.244.0.1:33648 on port 1883.
1708115939: New client connected from 10.244.0.1:33648 as auto-A4247317-B4D0-1B57-A339-E29F57E70313 (p2, c1, k60).
1708115939: Client auto-A4247317-B4D0-1B57-A339-E29F57E70313 disconnected.
只需将 Dockerfile 的 CMD 命令更改为：
CMD ["python", "-u", "./subscriber.py"]
您只需在终端中输入
python -h-u: force the stdout and stderr streams to be unbuffered;
this option does not affect stdin; also PYTHONUNBUFFERED=x
这是任何包含 Python 的 Docker 镜像中“必须要做的事情”。