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*General Troubleshooting*

Ambari Server: Check /var/log/ambari-server/ambari-server.\[log\|out\] for errors.
Ambari Agent: Check /var/log/ambari-agent/ambari-agent.\[log\|out\] for errors.
Note that if Ambari Agent has any output in /var/log/ambari-agent/ambari-agent.out, it is indicative of a significant problem.

*Services fail to start up*
* HDFS: Check log files under /var/log/hadoop/hdfs
* MapReduce: Check log files under /var/log/hadoop/mapred
* HBase: Check log files under /var/log/hbase
* Hive: Check log files under /var/log/hive
* Oozie: Check log files under /var/log/oozie
* ZooKeeper: Check log files under /var/log/zookeeper
* WebHCat: Check log files under /var/log/webhcat
* Nagios: Check log files under /var/log/nagios

*Nagios alerts don't show up in Ambari Web*
* Try running "service httpd restart" on the Nagios Server host.

*Install Wizard fails during Install phase*
* Click on the Retry button.  In most cases, this will solve install failures due to package install problems due to intermittent software repository availability (i.e., "No more mirrors to retry").

*Install Wizard failed with warning during Start/Test phase*
* Proceed by hitting "Next".  Once you are in the Dashboard, go to individual services, reconfigure, and start them to resolve any startup issues.

*Installing a new cluster on top of an existing cluster*

When installing a Hadoop cluster via Ambari on hosts that already have Hadoop bits installed (including an existing cluster deployed via Ambari), perform the following:

* Stop all the services on all the nodes(including ganglia and nagios)
* It is also a good practice to delete the rpms from all nodes.

* search for the rpms:
rpm \-qa \| grep ganglia
rpm \-qa \| grep oozie
rpm \-qa \| grep sqoop
rpm \-qa \| grep pig
rpm \-qa \| grep nagios
rpm \-qa \| grep hadoop

* and remove them :
rpm \-e <package name>

*{anchor:Spaces in manager DN/Base DN causing login issues in Ambari}{#Spaces#anchor Spaces in manager DN/Base DN causing login issues in Ambari}*

Note that there are some issues with Ambari current release 1.2.5 in case you have spaces in baseDN/managerDN. Please take a look at: https://issues.apache.org/jira/browse/ambari-3006. The fix will be available in 1.4.1 release of Ambari. In case you are running into issues and cant get rid of spaces in the managerDN/baseDN - keep reading.

I have created a jar with the patch applied on top of branch-1.2.5. The jar is posted at http://people.apache.org/~mahadev/ambari/ambari-server-1.2.5.17.jar. 

Download the above jar and follow the following steps for fixing the issue:

* Stop ambari server using

{code}
ambari-server stop
{code}

* Replace the ambari server jar with the downloaded jar

{code}
cp <download_ambari_server_jar> /usr/lib/ambari-server/ambari-server-1.2.5.17.jar
{code}

* Restart Ambari Server

{code}
ambari-server start
{code}

This should fix the issue with spaces in LDAP dn names.