Day 50 - install vsftpd on ceontos6.8

Today, I spent almost the whole day solving the installation vsftpd Through all kinds of problems , I felt very frustrated twice , I have searched all over the websites at home and abroad, but there is no solution , Almost give up , I think it's better to reinstall the system and start over .

But I feel a little lost , If the problem is solved by reinstallation , You may never know what went wrong , How to solve , It's not like you have to hand in your homework in a hurry , Because I am interested, I choose to build the website from scratch in my spare time , Although it didn't solve the problem , But I also deepened my understanding of Linux Understanding of command statements , No longer so afraid of installing the system from scratch , There are still gains . So after countless times of not knowing which step went wrong , Say to yourself , Try this method again , If you can't, just pretend centOS7 Start over again , Finally the problem was solved , hold vsftpd It's loaded , I'm still very moved .

Today's progress ：
1. It solves the problems of system file loss and Alibaba cloud source failure , Stumbled to install vsftpd
2. Insist to take exercise , Find short, intense exercise very useful , You can exercise for a few minutes before going to work in the morning
3. Keep reading
4. Keep records , Take notes
5. Keep going to bed early , keep 7 An hour's sleep
6. Control your diet , Exercise more

Learning notes ：
1.FTP The protocol works in two ways ：PORT The way and PASV The way , Chinese means active and passive .
One 、PORT（ Take the initiative ） The connection process of mode is ： Client to server FTP port （ The default is 21） Send a connection request , Server accepts connection , Set up a command link .
When data needs to be transmitted , The client uses... On the command link PORT The command tells the server ：“ I opened it. port , You come to connect me ”. So the server from 20 Port to client End