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01-17-2019
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05-02-2019
03:00 PM
We stopped all the services and rebooted every host in our cluster in order to do maintenance for another reason and surprisingly, Ambari stopped complaining. The aggregate alert shows the correct total count now.
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05-02-2019
02:20 PM
We decommissioned, stopped, and deleted the DataNode component using Ambari. I don't know if Ambari is confused because that Host still exists to run other services, but Ambari is still counting it in the aggregate alert even though that Host no longer has a DataNode component. It may be related to this bug: https://issues.apache.org/jira/browse/AMBARI-22581 However, I don't know how to work around it, other than ignoring/disabling the alert.
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04-30-2019
07:17 PM
We recently decommissioned one of our DataNodes. Afterwords, Ambari has been complaining about the "Percent DataNodes Available" Alert because it is still counting the decommissioned DataNode. The "DataNode Process" alert is OK for all of the remaining DataNodes. HDFS shows that all of the DataNodes are Started and Live. How can we get Ambari to stop complaining about the DataNode that no longer exists?
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Apache Ambari
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Apache Hadoop
01-19-2019
03:22 AM
@Geoffrey Shelton Okot
Thanks for your response, but I am still very confused.
I tried creating a keystore from the Let's Encrypt PEM file:
sudo keytool -import -file /etc/letsencrypt/live/mydomain.com/fullchain.pem -alias mydomain -keystore mydomain-keystore.jks
And assigned a password to it: PASSWORD
I then set:
zeppelin.ssl = true
zeppelin.ssl.key.manager.password = PASSWORD (I didn't know what to put here?!?)
zeppelin.ssl.keystore.password = PASSWORD
zeppelin.ssl.keystore.path = /etc/ssl/mydomain-keystore.jks
I left the other ssl settings as the default values, but the Zeppelin webpage was no longer accessible.
I turned zeppelin.ssl = false in order to get it working again.
In the zeppelin log, I couldn't find any abnormal messages indicating why the SSL settings are not working. If the keystore.path is wrong, I can see an error for that, but after fixing the path and permissions, Zeppelin still won't work properly.
So I really don't know what to do.
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01-18-2019
12:47 AM
I am trying to understand how to configure the SSL settings for Zeppelin so that it works with HTTPS. I have a certificate for the server domain from Let's Encrypt, so I was expecting a setting for the path to the pem file. However, that is not what zeppelin uses and I do not understand the different settings. I am currently using Ambari 2.6.2.0. I tried looking at some guides online, but I do not understand them and could not get things to work. Do the zeppelin.server.port and zeppelin.server.ssl.port settings need to be different or will it still work if they are the same? What is zeppelin.ssl.client.auth for? Where is the zeppelin.ssl.key.manager.password supposed to come from? Which Key Manager is this referring to? Where is the zeppelin.ssl.keystore.password supposed to come from? What is a keystore? Where is the zeppelin.ssl.truststore.password supposed to come from? What is a truststore? Is there some reference that I can look at that explains all of these things? Any assistance is greatly appreciated. Thank you very much.
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Apache Zeppelin