CentOS 7 firewall firewall command

1: Running state

[root@iZwz9ecyyd9aqswfdpvkvtZ ~]# firewall-cmd --state
running

2: New port

[root@iZwz9ecyyd9aqswfdpvkvtZ ~]# firewall-cmd --zone=public --add-port=8066/tcp --permanent
success
[root@iZwz9ecyyd9aqswfdpvkvtZ ~]# firewall-cmd --zone=public --add-port=9066/tcp --permanent
success

3: Update configuration

Operation after adding a port

[root@iZwz9ecyyd9aqswfdpvkvtZ ~]# firewall-cmd --reload
success

4: View all ports

[root@iZwz9ecyyd9aqswfdpvkvtZ ~]# firewall-cmd --zone=public --list-ports
8066/tcp 9066/tcp 

5: Stop the firewall

[root@iZwz9ecyyd9aqswfdpvkvtZ ~]# systemctl stop firewalld.service
[root@iZwz9ecyyd9aqswfdpvkvtZ ~]# firewall-cmd --state
not running

6: Start the firewall

[root@iZwz9ecyyd9aqswfdpvkvtZ ~]# systemctl start firewalld.service
[root@iZwz9ecyyd9aqswfdpvkvtZ ~]# firewall-cmd --state
running

7: Prohibit starting

systemctl disable firewalld.service 

8: View the listening port

[root@iZwz9ecyyd9aqswfdpvkvtZ ~]# netstat -lntp
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address           Foreign Address         State       PID/Program name    
tcp        0      0 0.0.0.0:443             0.0.0.0:*               LISTEN      52093/nginx: master 
tcp        0      0 0.0.0.0:2049            0.0.0.0:*               LISTEN      -                   
tcp        0      0 0.0.0.0:48193           0.0.0.0:*               LISTEN      1054/rpc.statd      
tcp        0      0 0.0.0.0:8066            0.0.0.0:*               LISTEN      2028309/java        
tcp        0      0 127.0.0.1:9066          0.0.0.0:*               LISTEN      2028309/java  

9: The process occupied by the port

[root@iZwz9ecyyd9aqswfdpvkvtZ ~]# netstat -lnpt |grep 52093
tcp        0      0 0.0.0.0:443             0.0.0.0:*               LISTEN      52093/nginx: master 
tcp        0      0 0.0.0.0:80              0.0.0.0:*               LISTEN      52093/nginx: master 
[root@iZwz9ecyyd9aqswfdpvkvtZ ~]# netstat -lnpt |grep 2028309
tcp        0      0 0.0.0.0:8066            0.0.0.0:*               LISTEN      2028309/java        
tcp        0      0 127.0.0.1:9066          0.0.0.0:*               LISTEN      2028309/java    

10: Process details

[root@iZwz9ecyyd9aqswfdpvkvtZ ~]# ps 52093
    PID TTY      STAT   TIME COMMAND
  52093 ?        Ss     0:00 nginx: master process /usr/sbin/nginx
[root@iZwz9ecyyd9aqswfdpvkvtZ ~]# ps 2028309
    PID TTY      STAT   TIME COMMAND
2028309 pts/1    Sl+    0:12 java -Dfile.encoding=UTF-8 -DMYCAT_HOME=/opt/mycat2/mycat/conf -jar /opt/mycat2/mycat/lib/mycat2-1.21-release-jar-with-dependencies-2022-2-18.jar
[root@iZwz9ecyyd9aqswfdpvkvtZ ~]#