Question

我已经构建了2个包含Flask应用程序（Web容器）和另一个包含Nginx作为负载平衡器的图像（nginx容器）的Docker图像。

使用docker-compose up and scale命令：

docker-compose up --scale web=2

结果：

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应用中通过一些获取请求得到的：

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

应用程序运行正常，但我想知道每个请求将使用哪个容器（web1或web2）。

有什么方法可以用来在我的烧瓶应用程序中显示容器ID？谢谢

Answer 1

默认情况下，容器的主机名是容器ID。像这样：

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

或

import socket
print(socket.gethostname())

Flask应用程序Docker ngnix

1 个答案: