@Bryan King Regarding username conflict.Alternative approach could be customizing the username specific to the cluster(say for eg <cluster-name>-hdfs,<cluster-name>yarn ) and maintain all of them in single KDC. ... View more

@shimrit hoori You can download putty and use the ssh option. The port is 2222 and host is 127.0.0.1 or from the command line. ssh root@127.0.0.1 -p 2222 should prompt for username and password . root/hadoop is the password. Then you are in.! Hope this helps. ... View more

Paul Tamburello You can manage these instances by provisioning tool (eg Chef/Puppet) . Setup the Nodename as you wish for example , master , slave, edge and use one of the recipes like the below one to set the nodename to hostname. This way whenever you reboot the AWS instances receipes will automatically kicks in if there is some discrepency. https://supermarket.chef.io/cookbooks/hostnames/versions/0.3.1 Also make sure both reverse and forward lookup works. Hope this helps. ... View more