how to find which keytab is it headless and it is service keytab

[#1]

Need to know how to differentiate headless and service keytab.. any specific commands

[#2 · Accepted solution]

@irfangk1 

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[#3]

@irfangk1 

From Standard Kerberos perspective there is no command to differentiate between headless/service keytab. 

However, we can differentiate between headless / service keytabs  you can find the detailed discussion about it in the following thread: 
https://community.cloudera.com/t5/Support-Questions/Headless-Keytab-Vs-User-Keytab-Vs-Service-Keytab...

Try running the following command on your keytab:

Headless keytab

Headless principals are not bound to a specific host or node, they have the syntax: - @EXAMPLE.COM

# klist -kte /etc/security/keytabs/hdfs.headless.keytab 
Keytab name: FILE:/etc/security/keytabs/hdfs.headless.keytab
KVNO Timestamp           Principal
---- ------------------- ------------------------------------------------------
   2 08/11/2019 01:58:27 [email protected] (des-cbc-md5) 
   2 08/11/2019 01:58:27 [email protected] (aes256-cts-hmac-sha1-96) 
   2 08/11/2019 01:58:27 [email protected] (des3-cbc-sha1) 
   2 08/11/2019 01:58:27 [email protected] (arcfour-hmac) 
   2 08/11/2019 01:58:27 [email protected] (aes128-cts-hmac-sha1-96) 

If it is truly a headless keytab then it will not have a principal specific to a Host.

Service keytab

Service principal is something that does not need to be a POSIX user,they are mostly applications that have own arrangement on how they run on the OS level and need to interact with the Kerberized cluster. Notice it's principal name has hostname included.
Example:

# klist -kte /etc/security/keytabs/nn.service.keytab 
Keytab name: FILE:/etc/security/keytabs/nn.service.keytab
KVNO Timestamp           Principal
---- ------------------- ------------------------------------------------------
   2 08/11/2019 01:58:40 nn/[email protected] (des-cbc-md5) 
   2 08/11/2019 01:58:40 nn/[email protected] (aes256-cts-hmac-sha1-96) 
   2 08/11/2019 01:58:40 nn/[email protected] (des3-cbc-sha1) 
   2 08/11/2019 01:58:40 nn/[email protected] (arcfour-hmac) 
   2 08/11/2019 01:58:40 nn/[email protected] (aes128-cts-hmac-sha1-96) 

.

[#4]

@irfangk1 
You can find more details about headless / service principals/keytabs in the following doc: 
https://docs.hortonworks.com/HDPDocuments/HDP3/HDP-3.1.0/authentication-with-kerberos/content/kerber...

[#5 · Accepted solution]

@irfangk1 

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[#6 · Accepted solution]

Yes