I am very new to all this stuff, but as a learning exercise I am trying to set up 4-node ambari cluster on EC2. I have master node that has both agent and server installed and three nodes with agents, all running on centOS 6. When I am trying to make a cluster using UI and manual host registration, all nodes except master fail with the following error: Registering with the server... Registration with the server failed. Though I got agents running already and hosts set up, I tried using automatic registration with SSH and got more verbose error: ========================== Creating target directory... ========================== Command start time 2016-04-08 06:34:14 Connection to ec2node1.hdp2 closed. SSH command execution finished host=ec2node1.hdp2, exitcode=0 Command end time 2016-04-08 06:34:14 ========================== Copying common functions script... ========================== Command start time 2016-04-08 06:34:14 scp /usr/lib/python2.6/site-packages/ambari_commons host=ec2node1.hdp2, exitcode=0 Command end time 2016-04-08 06:34:14 ========================== Copying OS type check script... ========================== Command start time 2016-04-08 06:34:14 scp /usr/lib/python2.6/site-packages/ambari_server/os_check_type.py host=ec2node1.hdp2, exitcode=0 Command end time 2016-04-08 06:34:14 ========================== Running OS type check... ========================== Command start time 2016-04-08 06:34:14 Cluster primary/cluster OS family is redhat6 and local/current OS family is redhat6 Connection to ec2node1.hdp2 closed. SSH command execution finished host=ec2node1.hdp2, exitcode=0 Command end time 2016-04-08 06:34:14 ========================== Checking 'sudo' package on remote host... ========================== Command start time 2016-04-08 06:34:14 sudo-1.8.6p3-20.el6_7.x86_64 Connection to ec2node1.hdp2 closed. SSH command execution finished host=ec2node1.hdp2, exitcode=0 Command end time 2016-04-08 06:34:14 ========================== Copying repo file to 'tmp' folder... ========================== Command start time 2016-04-08 06:34:14 scp /etc/yum.repos.d/ambari.repo host=ec2node1.hdp2, exitcode=0 Command end time 2016-04-08 06:34:14 ========================== Moving file to repo dir... ========================== Command start time 2016-04-08 06:34:14 Connection to ec2node1.hdp2 closed. SSH command execution finished host=ec2node1.hdp2, exitcode=0 Command end time 2016-04-08 06:34:14 ========================== Changing permissions for ambari.repo... ========================== Command start time 2016-04-08 06:34:14 Connection to ec2node1.hdp2 closed. SSH command execution finished host=ec2node1.hdp2, exitcode=0 Command end time 2016-04-08 06:34:15 ========================== Copying setup script file... ========================== Command start time 2016-04-08 06:34:15 scp /usr/lib/python2.6/site-packages/ambari_server/setupAgent.py host=ec2node1.hdp2, exitcode=0 Command end time 2016-04-08 06:34:15 ========================== Running setup agent script... ========================== Command start time 2016-04-08 06:34:15 ('WARNING 2016-04-08 06:34:21,213 AlertSchedulerHandler.py:243 - [AlertScheduler] /var/lib/ambari-agent/cache/alerts/definitions.json not found or invalid. No alerts will be scheduled until registration occurs. INFO 2016-04-08 06:34:21,213 AlertSchedulerHandler.py:139 - [AlertScheduler] Starting <ambari_agent.apscheduler.scheduler.Scheduler object at 0x1230a50>; currently running: False INFO 2016-04-08 06:34:21,217 hostname.py:86 - Read public hostname \'ec2-52-63-181-16.ap-southeast-2.compute.amazonaws.com\' from http://169.254.169.254/latest/meta-data/public-hostname INFO 2016-04-08 06:34:21,220 logger.py:67 - call[\'test -w /\'] {\'sudo\': True, \'timeout\': 5} INFO 2016-04-08 06:34:21,224 logger.py:67 - call returned (0, \'\') INFO 2016-04-08 06:34:21,224 logger.py:67 - call[\'test -w /dev/shm\'] {\'sudo\': True, \'timeout\': 5} INFO 2016-04-08 06:34:21,228 logger.py:67 - call returned (0, \'\') INFO 2016-04-08 06:34:21,228 logger.py:67 - call[\'test -w /grid/1\'] {\'sudo\': True, \'timeout\': 5} INFO 2016-04-08 06:34:21,232 logger.py:67 - call returned (0, \'\') INFO 2016-04-08 06:34:21,232 logger.py:67 - call[\'test -w /grid/2\'] {\'sudo\': True, \'timeout\': 5} INFO 2016-04-08 06:34:21,236 logger.py:67 - call returned (0, \'\') INFO 2016-04-08 06:34:21,236 logger.py:67 - call[\'test -w /grid/3\'] {\'sudo\': True, \'timeout\': 5} INFO 2016-04-08 06:34:21,239 logger.py:67 - call returned (0, \'\') ERROR 2016-04-08 06:34:21,251 main.py:309 - Fatal exception occurred: Traceback (most recent call last): File "/usr/lib/python2.6/site-packages/ambari_agent/main.py", line 306, in <module> main(heartbeat_stop_callback) File "/usr/lib/python2.6/site-packages/ambari_agent/main.py", line 297, in main ExitHelper.execute_cleanup() TypeError: unbound method execute_cleanup() must be called with ExitHelper instance as first argument (got nothing instead) ', None) ('WARNING 2016-04-08 06:34:21,213 AlertSchedulerHandler.py:243 - [AlertScheduler] /var/lib/ambari-agent/cache/alerts/definitions.json not found or invalid. No alerts will be scheduled until registration occurs. INFO 2016-04-08 06:34:21,213 AlertSchedulerHandler.py:139 - [AlertScheduler] Starting <ambari_agent.apscheduler.scheduler.Scheduler object at 0x1230a50>; currently running: False INFO 2016-04-08 06:34:21,217 hostname.py:86 - Read public hostname \'ec2-52-63-181-16.ap-southeast-2.compute.amazonaws.com\' from http://169.254.169.254/latest/meta-data/public-hostname INFO 2016-04-08 06:34:21,220 logger.py:67 - call[\'test -w /\'] {\'sudo\': True, \'timeout\': 5} INFO 2016-04-08 06:34:21,224 logger.py:67 - call returned (0, \'\') INFO 2016-04-08 06:34:21,224 logger.py:67 - call[\'test -w /dev/shm\'] {\'sudo\': True, \'timeout\': 5} INFO 2016-04-08 06:34:21,228 logger.py:67 - call returned (0, \'\') INFO 2016-04-08 06:34:21,228 logger.py:67 - call[\'test -w /grid/1\'] {\'sudo\': True, \'timeout\': 5} INFO 2016-04-08 06:34:21,232 logger.py:67 - call returned (0, \'\') INFO 2016-04-08 06:34:21,232 logger.py:67 - call[\'test -w /grid/2\'] {\'sudo\': True, \'timeout\': 5} INFO 2016-04-08 06:34:21,236 logger.py:67 - call returned (0, \'\') INFO 2016-04-08 06:34:21,236 logger.py:67 - call[\'test -w /grid/3\'] {\'sudo\': True, \'timeout\': 5} INFO 2016-04-08 06:34:21,239 logger.py:67 - call returned (0, \'\') ERROR 2016-04-08 06:34:21,251 main.py:309 - Fatal exception occurred: Traceback (most recent call last): File "/usr/lib/python2.6/site-packages/ambari_agent/main.py", line 306, in <module> main(heartbeat_stop_callback) File "/usr/lib/python2.6/site-packages/ambari_agent/main.py", line 297, in main ExitHelper.execute_cleanup() TypeError: unbound method execute_cleanup() must be called with ExitHelper instance as first argument (got nothing instead) ', None) Connection to ec2node1.hdp2 closed. SSH command execution finished host=ec2node1.hdp2, exitcode=0 Command end time 2016-04-08 06:34:23 Registering with the server... Registration with the server failed. Any help or pointers would be greatly appreciated! ... View more