Important

Before adding servers to the trusted storage pool, you must ensure that the ports specified in [chap-Getting_Started-Port_Information] are open.

On Red Hat Enterprise Linux 7, enable the glusterFS firewall service in the active zones for runtime and permanent mode using the following commands:

To get a list of active zones, run the following command:

# firewall-cmd --get-active-zones

To allow the firewall service in the active zones, run the following commands:

# firewall-cmd --zone=zone_name --add-service=glusterfs
# firewall-cmd --zone=zone_name --add-service=glusterfs --permanent

For more information about using firewalls, see section Using Firewalls in the Red Hat Enterprise Linux 7 Security Guide: https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/7/html/Security_Guide/sec-Using_Firewalls.html.

Note

When any two gluster commands are executed concurrently on the same volume, the following error is displayed:

Another transaction is in progress.

This behavior in the GlusterFS prevents two or more commands from simultaneously modifying a volume configuration, potentially resulting in an inconsistent state.

Such an implementation is common in environments with monitoring frameworks such as the GlusterFS Console, Red Hat Enterprise Virtualization Manager, and Nagios. For example, in a four node GlusterFS Trusted Storage Pool, this message is observed when gluster volume status VOLNAME command is executed from two of the nodes simultaneously.