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New Contributor
Posts: 2
Registered: ‎05-23-2016

Hue - The Cloudera Manager Agent is not able to communicate with this role's web server

After upgrading from 5.3.1 to 5.7.0 the Hue "Web Server Status" is "The Cloudera Manager Agent is not able to communicate with this role's web server".

 

Both of the servers that run Hue have the same error message in "/var/log/cloudera-scm-agent/cloudera-scm-agent.log"

Monitor-GenericMonitor urllib2_kerberos
GSSAPI Error: Unspecified GSS failure.  Minor code may provide more information/Cannot determine realm for numeric host address

 

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Cloudera Employee
Posts: 289
Registered: ‎07-08-2013

Re: Hue - The Cloudera Manager Agent is not able to communicate with this role's web server

On the affected nodes can you check;

a. reverse/forward lookup the <host.fqdn> part of your princial ie: [HTTP|hue]/<host.fqdn>@REALM - as the Kerberos message indicate that it unable to "... determine the realm for the numeric [ip] host address".

b. in your <host.fqdn> the 'fqdn' part is correctly associated with a REALM in the [domain_realm] 

c. in krb5.conf check if dns_lookup_realm is configured correctly [1]

 

The generated principals are listed in CM UI> Administration> Security> Kerberos Credentials.

or you can set krb5.conf according to this [2]

 

 

[1] http://www.cloudera.com/documentation/enterprise/latest/topics/cm_sg_sec_troubleshooting.html

[2] http://web.mit.edu/kerberos/krb5-1.5/krb5-1.5.1/doc/krb5-admin/libdefaults.html#libdefaults

New Contributor
Posts: 2
Registered: ‎05-23-2016

Re: Hue - The Cloudera Manager Agent is not able to communicate with this role's web server

I should have added that the server that hosts hue is also utilized as a jump host for access to the Cloudera cluster for management and has kerberos enabled for access.

 

For the Cloudera cluster, kerberos is not enabled.

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