"AWS EC2 上的 Django 无法连接，常规 Python 连接"

Question

I am trying to run the development version of Django from the Github dev code . The code is running on an AWS EC2 instance , and I'm running Firefox on my local desktop ( Kubuntu Linux ). When I try to connect I get this error:

Unable to connect

Firefox can't establish a connection to the server at 1.2.3.4:8000.

I know that I have the firewall, AWS security groups, and VPS set up properly as I can access the port when starting a normal Python web server:

$ python3 -m http.server
Serving HTTP on 0.0.0.0 port 8000 ...
bzq-241-14.net - - [16/Mar/2015 10:17:28] "GET / HTTP/1.1" 200 -
bzq-241-14.net - - [16/Mar/2015 10:17:29] code 404, message File not found
bzq-241-14.net - - [16/Mar/2015 10:17:29] "GET /favicon.ico HTTP/1.1" 404 -
bzq-241-14.net - - [16/Mar/2015 10:17:29] code 404, message File not found
bzq-241-14.net - - [16/Mar/2015 10:17:29] "GET /favicon.ico HTTP/1.1" 404 -
^C
Keyboard interrupt received, exiting.

However, the Django server doesn't even register a rejected connection:

$ python manage.py runserver
Performing system checks...

System check identified no issues (0 silenced).
March 16, 2015 - 11:00:30
Django version 1.9, using settings 'Reboot.settings'
Starting development server at http://127.0.0.1:8000/
Quit the server with CONTROL-C.

What might be the cause of the connection issue?

Answer 1

The development server is bound to localhost and not accessible from other machines. You can set the port via a parameter as documented here: https://docs.djangoproject.com/en/1.7/ref/django-admin/#runserver-port-or-address-port .

But of cause the best way would be to deploy Django properly: https://docs.djangoproject.com/en/1.7/howto/deployment/

Answer 2

On a hunch, I tried starting the server with the IP address and port of the server, that did not help:

$ python manage.py runserver 1.2.3.4:8000
Performing system checks...

System check identified no issues (0 silenced).
March 16, 2015 - 11:08:43
Django version 1.9, using settings 'Reboot.settings'
Starting development server at http://1.2.3.4:8000/
Quit the server with CONTROL-C.
Error: That IP address can't be assigned-to.

However, starting the Django server with the LAN IP address did help:

$ ifconfig
eth0      Link encap:Ethernet  HWaddr 2a:da:26:29:39:8e  
          inet addr:10.0.0.101  Bcast:10.0.0.255  Mask:255.255.255.0
          inet6 addr: fe80::28da:26ff:fe29:398e/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:535102 errors:0 dropped:0 overruns:0 frame:0
          TX packets:364585 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:333175535 (333.1 MB)  TX bytes:183546758 (183.5 MB)
          Interrupt:43 

lo        Link encap:Local Loopback  
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:12760 errors:0 dropped:0 overruns:0 frame:0
          TX packets:12760 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:988343 (988.3 KB)  TX bytes:988343 (988.3 KB)

$ python manage.py runserver 10.0.0.101:8000
Performing system checks...

System check identified no issues (0 silenced).
March 16, 2015 - 11:09:08
Django version 1.9, using settings 'Reboot.settings'
Starting development server at http://10.0.0.101:8000/
Quit the server with CONTROL-C.
[16/Mar/2015 11:09:11]"GET / HTTP/1.1" 200 1767
[16/Mar/2015 11:10:04]"GET / HTTP/1.1" 200 1767
[16/Mar/2015 11:10:05]"GET /favicon.ico HTTP/1.1" 404 1941
[16/Mar/2015 11:10:05]"GET /favicon.ico HTTP/1.1" 404 1941

Thus, on AWS (and possibly all remote servers) one must start the Django server with the LAN IP address in order to access the remote test server.

Answer 3

Might help a beginner or someone new to AWS

I knew I had to add some rules to the security groups but I didn't knew exactly which ones so here are the rules that you should add

Go To -> EC2 > Security Groups > your-security-group > Edit inbound rules

after this you have to start the django server using the following

python3 manage.py runserver 0.0.0.0:8000

And now you can access your django app on :8000 of your EC2 public domain