Context
We have found, in several situations, that there was something new in CentOS/RHEL 7 that was blocking ports. The firewall on Redhat 7 Linux system is enabled by default. It may have to be disabled for the cluster to operate correctly and the clients to reach it. The client may report "no route to host" error when firewalld is running. Below are the commands that you can used to operate firewalld.Method
1. Check if service is running:
systemctl status firewalld
2. Steps to Stoping Firewalld
Stop RHEL7 firewall The firewall on Redhat 7 Linux system can be stopped using the following command:
service firewalld stop
Stopped firewall will start again after system's reboot.
3. Steps to disable Firewalld on RHEL7
In order to completely disable RHEL7 firewalld so it would no longer load after reboot run:
systemctl disable firewalld
Now the firewall will not start after system's reboot.