Network validation

While using a private network for Hadoop DataNodes, ensure that all nodes, including the management nodes, have hostnames bound to the faster internal network or the data network.

On all nodes, the hostname -f must return the FQDN of the faster internal network. This network can be a bonded network. If the nodes do not return the FQDN, modify /etc/sysconfig/network and use the hostname command to change the FQDN of the node.

The /etc/hosts file host order listing must have the long hostname first before the short hostname. Otherwise, the HBase service check in Ambari can fail.

If the nodes in your cluster have two network adapters, see Dual Network Deployment.