Growth of operation and maintenance Xiaobai - week 7

1. solve DOS Attack * Hit production case : according to web Number of log or network connections , Monitor when a IP Number of concurrent connections or in a short time PV achieve 100, Call the firewall command to block the corresponding IP, Monitoring frequency every 5 minute . The firewall command is :iptables -A INPUT -s IP -j REJECT.

link ：​ ​https://blog.51cto.com/u_15473594/5004088​​​

2. Describe the process of key exchange .

link ：​ ​https://blog.51cto.com/u_15473594/5004089​​​

3. https Communication process of .

link ：​ ​https://blog.51cto.com/u_15473594/5004091​​​

4. Use awk Get... Separated by colons /ettc/passwd File first column .

link ：​ ​https://blog.51cto.com/u_15473594/5004092​​​