View firewall status
[hadoop@master ~]$ firewall-cmd --state
running
turn off firewall
[hadoop@master ~]$ systemctl stop firewalld.service
disable firewall
[hadoop@master ~]$ systemctl disable firewalld.service
View firewall status
[hadoop@master ~]$ firewall-cmd --state
running
turn off firewall
[hadoop@master ~]$ systemctl stop firewalld.service
disable firewall
[hadoop@master ~]$ systemctl disable firewalld.service