[ https://issues.apache.org/jira/browse/HDDS-14064 ]
Gargi Jaiswal deleted comment on HDDS-14064:
--------------------------------------
was (Author: JIRAUSER308350):
The DN reconfiguration problem is because the `dfs.datanode.kerberos.principal`
property value is different in DN and Client side.
DN side *“dfs.datanode.kerberos.principal“* is configured to
*“dn/[email protected]”* in ozone-site.xml, but Client, it uses
{color:#de350b}ozone-site.xml{color} which doesn’t have this property
configured, so it fallback to the property in
{color:#de350b}hdfs-site.xml{color}, where *“dfs.datanode.kerberos.principal”*
value is {*}“hdfs/[email protected]“{*}.
Add “dfs.datanode.kerberos.principal” with value “dn/[email protected]” in
ozone-site.xml will solve the problem.
Its better if we have default value set for `hdds.datanode.kerberos.principal`.
> Missing default value for "hdds.datanode.kerberos.principal"
> ------------------------------------------------------------
>
> Key: HDDS-14064
> URL: https://issues.apache.org/jira/browse/HDDS-14064
> Project: Apache Ozone
> Issue Type: Bug
> Reporter: Gargi Jaiswal
> Assignee: Gargi Jaiswal
> Priority: Major
> Labels: pull-request-available
>
> The configuration property
> {code:java}
> hdds.datanode.kerberos.principal{code}
> in *ozone-default.xml* has an empty default value, while similar properties
> for SCM and OM have defaults (SCM/_HOST@REALM and OM/_HOST@REALM
> respectively). This inconsistency can lead to configuration errors in secure
> Ozone clusters.
> *Current Behaviour:*
> {code:java}
> <property>
> <name>hdds.datanode.kerberos.principal</name>
> <value/> <!-- EMPTY -->
> <tag>OZONE, DATANODE</tag>
> <description>
> The Datanode service principal. This is typically set to
> dn/[email protected]. Each Datanode will substitute _HOST with its
> own fully qualified hostname at startup. The _HOST placeholder
> allows using the same configuration setting on all Datanodes.
> </description>
> </property> {code}
>
> When unset, it falls back to the deprecated
> {color:#de350b}dfs.datanode.kerberos.principal{color} via
> *OzoneConfiguration.java* deprecation handling. This causes DN
> *reconfiguration* or *diskbalancer* command issues where:
> * {*}DataNode side{*}: hdds.datanode.kerberos.principal is empty, so it
> falls back {color:#de350b}dfs.datanode.kerberos.principal{color} is set to
> {color:#de350b}dn/_HOST@REALM{color} in dn ozone-site.xml . This is handled
> correctly due to deprecating keys.
> * {*}Client side{*}: hdds.datanode.kerberos.principal is not set in client
> side ozone-site.xml, so it falls back to
> {color:#de350b}dfs.datanode.kerberos.principal{color} from
> {color:#de350b}hdfs-site.xm{color}l (e.g., hdfs/_HOST@REALM)
> The mismatch between dn/_HOST@... and hdfs/_HOST@... causes reconfiguration
> and diskbalancer command to fail for any client to dn cli. Right now to make
> these commands work user need to explicity set the value of property in the
> ozone-site.xml.
>
> {code:java}
> bash > ozone admin reconfig --service=DATANODE --in-service-datanodes
> properties
> An error occurred while executing the command for :10.145.32.0:19864
> java.lang.RuntimeException: java.io.IOException: DestHost:destPort
> dn-host-1:19864 , LocalHost:localPort dn-host-1/10.145.32.0:0. Failed on
> local exception: java.io.IOException: javax.security.sasl.SaslException: Bad
> Kerberos server principal configuration
> [Caused by java.lang.IllegalArgumentException: Server has invalid Kerberos
> principal:dn/dn-host-1@REALM, expecting: hdfs/dn-host-1@REALM]
>
> bash > ozone admin datanode diskbalancer start in-service-datanodes
> An error occurred while executing the command for :10.145.32.0:19864
> java.lang.RuntimeException: java.io.IOException: DestHost:destPort
> dn-host-1:19864 , LocalHost:localPort dn-host-1/10.145.32.0:0. Failed on
> local exception: java.io.IOException: javax.security.sasl.SaslException: Bad
> Kerberos server principal configuration [Caused by
> java.lang.IllegalArgumentException: Server has invalid Kerberos
> principal:dn/dn-host-1@REALM, expecting: hdfs/dn-host-1@REALM]
> {code}
>
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