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Kerberos installation failing

Kerberos installation failing

Contributor

Hello Team,

We are using HDP-2.6.5.0 and Ambari-2.6.2.2. While enabling kerberos we are getting following error in ambari UI

Admin session expiration error. 
Missing KDC administrator admin credentials. Please enter admin principal and password". 

Attached the screenshot for same kerb-admin-cred.png.

At the same time in ambari server log we get following error message:

28 Nov 2018 01:35:46,078  INFO [ambari-client-thread-39] AmbariManagementControllerImpl:4173 - Received action execution request, clusterName=hdpmedacist, request=isCommand :true, action :null, command :KERBEROS_SERVICE_CHECK, inputs :{HAS_RESOURCE_FILTERS=true}, resourceFilters: [RequestResourceFilter{serviceName='KERBEROS', componentName='null', hostNames=[]}], exclusive: false, clusterName :hdpmedacist
28 Nov 2018 01:35:47,516 ERROR [ambari-client-thread-39] KerberosHelperImpl:2232 - Cannot validate credentials: org.apache.ambari.server.serveraction.kerberos.KerberosMissingAdminCredentialsException: Missing KDC administrator credentials.
The KDC administrator credentials must be set as a persisted or temporary credential resource.This may be done by issuing a POST to the /api/v1/clusters/:clusterName/credentials/kdc.admin.credential API entry point with the following payload:
{
  "Credential" : {
    "principal" : "(PRINCIPAL)", "key" : "(PASSWORD)", "type" : "(persisted|temporary)"}
  }
}
28 Nov 2018 01:35:47,516 ERROR [ambari-client-thread-39] BaseManagementHandler:67 - Bad request received: Missing KDC administrator credentials.
The KDC administrator credentials must be set as a persisted or temporary credential resource.This may be done by issuing a POST to the /api/v1/clusters/:clusterName/credentials/kdc.admin.credential API entry point with the following payload:
{
  "Credential" : {
    "principal" : "(PRINCIPAL)", "key" : "(PASSWORD)", "type" : "(persisted|temporary)"}
  }
}


How to resolve this? Our Kerberos installation stuck due to this.

Please suggest. Thanks in advance.

Thanks,

Bhushan

5 REPLIES 5

Re: Kerberos installation failing

Expert Contributor

@Bhushan Kandalkar,

1. Check the Principals

$kadmin.local
Authenticating as principal root/admin@<realm> with password.
kadmin.local:  listprincs
K/M@<realm>
kadmin/admin@<realm>
kadmin/changepw@<realm>
kadmin/KDC_SERVER_FQDN@<realm>
kiprop/KDC_SERVER_FQDN@<realm>
krbtgt/TEST.COM@TEST.COM

2. Must create a admin principal for enabling kerberos from ambari

$kadmin.local
$kadmin.local:  addprinc admin/admin@<realm>
WARNING: no policy specified for root/admin@<realm>; defaulting to no policy
Enter password for principal "admin/admin@<realm>":<password>
Re-enter password for principal "admin/admin@<realm>":<password>
Principal "admin/admin@<realm>" created.

3. Install kerberos Client package

On all the hosts in the cluster, install the client
$yum install -y krb5-libs krb5-workstation
copy the krb5.conf to all the hosts from kdc server.

4. While enabling the kerberos from ambari, use the below principal and corresponding password

Admin principal : admin/admin@<realm> 
admin password : <password>

Hope this helps!!!

Re: Kerberos installation failing

Contributor

@Sampath Kumar, I do not have kadmin.local access. Is there any other way I can check for this?

Re: Kerberos installation failing

@Bhushan Kandalkar

- Did you tried manual kinit of the same principal on ambari-server machine like,

# kinit admin/admin@REALM
Password: *******

- Check if above is working fine. If this is working fine, try adding the Credential using API call as temporary or Permanent,

https://community.hortonworks.com/articles/42927/adding-kdc-administrator-credentials-to-the-ambari....

- If it is still failing, you would need to share the ambari-server.log for the same time of failure

Hope this helps!!!

Re: Kerberos installation failing

Contributor

Hi @Nitin Shelke,

I have followed steps mentioned at : https://community.hortonworks.com/articles/42927/adding-kdc-administrator-credentials-to-the-ambari....

But still getting same error in ambari server log.

Please suggest.

Re: Kerberos installation failing

Contributor