烧瓶应用程序Docker ngnix

我已经构建了两个Docker映像，其中包含一个Flask应用程序（web容器），另一个映像（nginx容器）包含nginx作为负载平衡器

使用docker compose up and scale命令：

docker-compose up --scale web=2

结果是：

Starting dockerflaskloadb_web_1 ... done
Creating dockerflaskloadb_web_2 ... done
Starting dockerflaskloadb_nginx_1 ... done
Attaching to dockerflaskloadb_web_1, dockerflaskloadb_web_2, dockerflaskloadb_nginx_1
web_1    | [2018-08-22 11:27:20 +0000] [1] [INFO] Starting gunicorn 19.6.0
web_1    | [2018-08-22 11:27:20 +0000] [1] [INFO] Listening at: http://0.0.0.0:8000 (1)
web_1    | [2018-08-22 11:27:20 +0000] [1] [INFO] Using worker: sync
web_1    | [2018-08-22 11:27:20 +0000] [8] [INFO] Booting worker with pid: 8
web_2    | [2018-08-22 11:27:21 +0000] [1] [INFO] Starting gunicorn 19.6.0
web_2    | [2018-08-22 11:27:21 +0000] [1] [INFO] Listening at: http://0.0.0.0:8000 (1)
web_2    | [2018-08-22 11:27:21 +0000] [1] [INFO] Using worker: sync
web_2    | [2018-08-22 11:27:21 +0000] [8] [INFO] Booting worker with pid: 8

这是我在Flask应用程序中获得的一些get请求：

nginx_1  |  [22/Aug/2018:11:33:31 +0000] "GET /home HTTP/1.1" 200 5640 "http://192.168.99.100/about" "Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/68.0.3440.106 Safari/537.36" "-" -172.22.0.4
nginx_1  |  [22/Aug/2018:11:33:33 +0000] "GET /home HTTP/1.1" 200 5640 "http://192.168.99.100/home" "Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/68.0.3440.106 Safari/537.36" "-" -172.22.0.4
nginx_1  |  [22/Aug/2018:11:33:33 +0000] "GET /about HTTP/1.1" 200 3195 "http://192.168.99.100/home" "Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/68.0.3440.106 Safari/537.36" "-" -172.22.0.4

该应用程序运行良好，但我想知道每个请求将使用哪个容器（web1或web2）

是否有任何方法可用于在我的flask应用程序中显示容器ID？

---

谢谢，默认情况下，容器的主机名是容器id。例如：

import os
id = os.environ['HOSTNAME']

或

import socket
print(socket.gethostname())