[jira] [Created] (AMBARI-12128) Falcon Server Web UI alert fails when Kerberos is enabled

["Robert Levas (JIRA)" <ji...@apache.org>]

Robert Levas created AMBARI-12128:
-------------------------------------

             Summary: Falcon Server Web UI alert fails when Kerberos is enabled
                 Key: AMBARI-12128
                 URL: https://issues.apache.org/jira/browse/AMBARI-12128
             Project: Ambari
          Issue Type: Bug
          Components: ambari-agent, ambari-server
    Affects Versions: 2.1.0
            Reporter: Robert Levas
            Assignee: Robert Levas
            Priority: Blocker
             Fix For: 2.1.0


Falcon Server Web UI alert fails when Kerberos is enabled.  The error message is 
{noformat}
agent/data/tmp/web_alert_cc_2144dc375b8556f5a0c2629adedd2a99 -kt {{falcon-startup.properties/*.falcon.http.authentication.kerberos.keytab}} {{falcon-startup.properties/*.falcon.http.authentication.kerberos.principal}} > /dev/null' returned 1. kinit: Client not found in Kerberos database while getting initial credentials)
{noformat}

*Cause*
This issue was introduced when the patch for AMBARI-11656 was applied.  

The issue is related to this line:
{code:title=ambari_agent/alerts/base_alert.py:217}
      replacement_match_regex = r"{{(%s)}}" % placeholder_key
{code}

When the relative falcon properties are applied, the generated regular expression becomes 
{noformat}
{{(falcon-startup.properties/*.falcon.http.authentication.kerberos.keytab)}}
{noformat}

Which wants to match on values like:
* falcon-startup.properties.falcon.http.authentication.kerberos.keytab
* falcon-startup.properties/.falcon.http.authentication.kerberos.keytab
* falcon-startup.properties/////////////Rfalcon.http.authentication.kerberos.keytab

Not the one we really want - falcon-startup.properties/*.falcon.http.authentication.kerberos.keytab

Either the {{*}} needs to be escaped or the use of regular expressions needs to be changed.

*Solution*
Remove the regular expression replacement and use somple string replacement instead. 



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