[jira] [Created] (AMBARI-22828) Ambari agent registration passes even though the hostnames do not match

["Srikanth Janardhan (JIRA)" <ji...@apache.org>]

Srikanth Janardhan created AMBARI-22828:
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             Summary: Ambari agent registration passes even though the hostnames do not match
                 Key: AMBARI-22828
                 URL: https://issues.apache.org/jira/browse/AMBARI-22828
             Project: Ambari
          Issue Type: Bug
          Components: ambari-agent
    Affects Versions: 2.6.2
            Reporter: Srikanth Janardhan
             Fix For: 2.6.2


h6. Test Steps
# # Setup Ambari and start it
# Start Deployment of HDP till Install Options page
# Enter different hostnames in Target Hosts field (for e.g. ambari-host.1 and ambari-host.2)
# Change the hostnames for other hosts in the cluster in /etc/hosts in Ambari Server machine to match the above 2 host names (e.g. x.x.x.x abc.example.com to x.x.x.x ambari-host.1)
# At this point, other machines in the cluster have different host names from what is provided in the server.
# Add the SSH keys in Install Options page and click "Register and Confirm"

h6. Expected
# The ambari agent registration fails in Ambari UI
# A Warning message appears in the agent logs: {quote}Ambari agent machine hostname (ctr-e137-1514896590304-32888-01-000005.hwx.site.) does not match expected ambari server hostname (ambari.host-1). Aborting registration. Please check hostname, hostname -f and /etc/hosts file to confirm your hostname is setup correctly{quote} 

h6. Actual
# Ambari agent registration passes successfully !Screen Shot 2018-01-23 at 12.34.06 PM.png|thumbnail! 
# The warning message does not appear in agent logs.

Whereas attempting a restart of the agent with incorrect hostname does not succeed:
{code:bash}
[root@ctr-e137-1514896590304-32888-01-000003 ~]# /usr/sbin/ambari-agent restart --expected-hostname=ambari.host-2
Restarting ambari-agent
Verifying Python version compatibility...
Using python  /usr/bin/python
Found ambari-agent PID: 28192
Stopping ambari-agent
Removing PID file at /run/ambari-agent/ambari-agent.pid
ambari-agent successfully stopped
Verifying Python version compatibility...
Using python  /usr/bin/python
Checking for previously running Ambari Agent...
Checking ambari-common dir...
Starting ambari-agent
Killed
===================
INFO 2018-01-23 07:03:36,654 DataCleaner.py:120 - Data cleanup started
INFO 2018-01-23 07:03:36,655 hostname.py:67 - agent:hostname_script configuration not defined thus read hostname 'ctr-e137-1514896590304-32888-01-000003.hwx.site' using socket.getfqdn().
ERROR 2018-01-23 07:03:36,656 main.py:244 - Ambari agent machine hostname (ctr-e137-1514896590304-32888-01-000003.hwx.site) does not match expected ambari server hostname (ambari.host-2). Aborting registration. Please check hostname, hostname -f and /etc/hosts file to confirm your hostname is setup correctly
INFO 2018-01-23 07:03:36,657 ExitHelper.py:56 - Performing cleanup before exiting...
===================
{code}

Ambari build: 2.6.2.0-32. 



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