Common Linux command collection

Common Linux command collection

Operation Firewall

Add # - allows access to the port number 8084 
[@ VM_0_4_centos the root sbin] # Firewall -cmd --add-Port = 8084 / TCP - Permanent
success

# Reload firewall rules 
[root @ VM_0_4_centos sbin] # Firewall -cmd - reload
success

# View firewall rules 
[root @ VM_0_4_centos sbin] # Firewall -cmd --list-All
 public
  target:default
  ICMP-block-Inversion: NO
  interfaces: 
  sources: 
  services: ssh dhcpv6-client
  ports: 8081/tcp 8080/tcp 8088/tcp 8089/tcp 8082/tcp 8083/tcp 8084/tcp
  protocols: 
  masquerade: no
  forward-ports: 
  source-ports: 
  icmp-blocks: 
  rich rules: 

# Turn off the firewall 
[root @ VM_0_4_centos sbin] # systemctl STOP firewalld 

# Turn on the firewall 
[root @ VM_0_4_centos sbin] # systemctl Start firewalld 

# Check firewall status 
[root @ VM_0_4_centos sbin] # systemctl Status firewalld 
● firewalld.service- firewalld -Dynamic Firewall daemon
   Loaded: loaded (/usr/lib/systemd/system/firewalld.service; disabled; vendor preset: enabled)
   Active: active (running) since Fri 2020-01-31 11:18:25 CST; 3s ago
     Docs: man:firewalld(1)
 Main PID: 25686 (firewalld)
    Tasks: 2
   Memory: 28.0M
   CGroup: /system.slice/firewalld.service
           └─25686 /usr/bin/python -Es /usr/sbin/firewalld --nofork --nopid

 

View port occupancy

#netstat - tunlp see which port numbers are occupied
[root@AY120808035024e539829 webapps]# netstat -tunlp
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address               Foreign Address             State       PID/Program name   
tcp        0      0 0.0.0.0:3306                0.0.0.0:*                   LISTEN      27893/mysqld        
tcp        0      0 127.0.0.1:6379              0.0.0.0:*                   LISTEN      2770/redis-server 1 
………………

 

Copy files

[root@AY120808035024e539829 ~]# cd /opt/java/tomcat/webapps/
[root@AY120808035024e539829 webapps]# pwd
/ opt / java / Tomcat / webapps 
## to / opt / java / all files tomcat / webapps / lop_project folder, copied to the / opt / java / tomcat / webapps / lop_project_house directory
[root@AY120808035024e539829 webapps]# cp -r lop_project/. lop_project_house/