Linux opens the specified port command_Boda Java World Blog

Method 1

CentOS:

1. Open the firewall
 systemctl start firewalld

 2. Open the specified port
 firewall-cmd --zone=public --add-port=1935/tcp --permanent
 Command meaning:
 --zone #Scope
 --add-port=1935/tcp #Add port, the format is: port/communication protocol
 --permanent #Permanently effective, without this parameter, it will fail after restarting

 3. Restart the firewall
 firewall-cmd --reload

 4. Check the port number
 netstat -ntlp //View all current tcp ports

 netstat -ntulp |grep 1935 //View all 1935 port usage 

Method 2

#Open port: 8080

/sbin/iptables -I INPUT -p tcp –dport 8080 -j ACCEPT

Method 3

-A INPUT -m state –state NEW -m tcp -p tcp –dport 8080 -j ACCEPT

service iptables restart