Centos 7 set firewall to open specified ports

1. Centos7 set up firewall and open ports

1. View open ports (no ports are opened by default)

   firewall-cmd --list-ports

2. open port 80 

   firewall-cmd --zone=public (scope) --add-port= 80 /tcp (port and access type) --permanent (permanent effect)

3. restart firewall 

   firewall-cmd --reload

4. stop firewall 

   systemctl stop firewalld.service

5. Disable firewall startup 

   systemctl disable firewalld.service

6. delete the specified port

   firewall-cmd --zone=public (scope) --remove-port= 80 /tcp (port and access type) --permanent (permanent)

    

2. Set firewall and open ports below Centos 7

1. Open ports 80, 22, 8080

   /sbin/iptables -I INPUT -p tcp --dport 80 -j ACCEPT 
   /sbin/iptables -I INPUT -p tcp --dport 22 -j ACCEPT 
   /sbin/iptables -I INPUT -p tcp --dport 8080 -j ACCEPT 

2. keep

   /etc/rc.d/init.d/iptables save

3. View open ports

   /etc/init.d/iptables status

4. turn off firewall
   1.  Permanent effect, will not be restored after restart

      Enable: chkconfig iptables on
      Off: chkconfig iptables off

   2. Takes effect immediately, restores after restart

      Start: service iptables start
      Shutdown: service iptables stop