Run flash demo on ECS

Running on ECs Flask DEMO

I did a good job on ECs two days ago python Installation , Today, try how to run on the server Flask
my linux The foundation is not very good , Feel the stone to cross the river

1. install flask

pip install flask
fast , It used to be on Alibaba cloud pip The source of is directly changed to Alibaba cloud's image server .

2. import Have a try no way , Checked, maybe pip The installed path is not added to the system

PATH environment variable . Look at the online statement change PATH It seems a little difficult , It is also possible to create a virtual environment
try

3. cd To create a good project directory projects/flask_car
   cd projects/flask_car

4. Enter to create virtual environment
   virtualenv flask
   

5. After creating ls once , More than a flask Catalog , Again cd go in
   

6. Activate flask A virtual environment source bin/activate

7. Here to install pip install flask
   

8. Back up one level after installation ,ls following , Run written server.py Demo
   

9. Press CTRL After clicking , Errors occurred . Connection rejected , It's not that simple . The firewall needs to be turned on
   

10. deactivate Exit virtual environment

11. firewall-cmd --state View firewall status , Not open
    
    systemctl start firewalld Start the firewall
    firewall-cmd --zone=public --add-port=5000/tcp --permanent
    

12. I don't know whether this one works , I went to the security group of the system to add 5000 Port access permission rules
    

13. Until then flask Re run in the environment server.py, test

14. server.py Code

from flask import Flask
app = Flask(__name__)
@app.route('/')
def index():
    return '<center><h1>Hello Flask,This is the first page</h1></center>'
if __name__ == "__main__":
    app.run(host="0.0.0.0", debug=True, port=5000)

15. Click the link 0.0.0.0:5000, cannot access . The external network should be a public network IP Of .
16. Change to public network IP:5000, finally Demo Page appears .Flask Debugging completed . The local firewall does not affect