Support Questions

mazen_elshayeb · ‎05-13-2019

Hello

I receive an error while enabling kerberos on ambari as below;

i have installed krb5-kdc krb5-admin-server and config krb5.conf, kdc.conf and kadm5.acl then created new principle (as attached)

Note when i wrote the realm name in the kdc file in uppercase letter i got an error while using kadmin.local master key cannot be fetch, it only works in lowercase letter

Also when i try to restart the krb5 services, it said service can't be found although it is running so i restart the server instead

Last thing when i installed krb5-kdc krb5-admin-server the /var/kerberos folder didn't create automatically and i had to create it manually.

Please help me solve this issue, thank you in advanced.

KADM5.acl.txt

KDC.conf.txt

KRB5.conf.txt

Shelton · ‎05-13-2019

@Mazen Elshayeb

There is something I don't understand can you share how you create the KDC database? How come you have a principal "[email protected]"?

I suggest starting afresh so delete/destroy the current KDC as the root user or sudo on ubuntu whichever is appropriate

# sudo  kdb5_util -r HADOOP.COM destroy

Accept with a "Yes"

Now create a new Kerberos database

Complete remove Kerberos

$ sudo apt purge -y krb5-kdc krb5-admin-server krb5-config krb5-locales krb5-user krb5.conf 
$ sudo rm -rf /var/lib/krb5kdc

Do a refresh installation

First, get the FQDN of your kdc server for this example

# hostanme -f 
test.hadoop.com

Use the above output for a later set up

# apt install krb5-kdc krb5-admin-server krb5-config

Proceed as follow

At the prompt for the Kerberos Realm = HADOOP.COM
Kerberos server hostname = test.hadoop.com
Administrative server for Kerberos REALM = test.hadoop.com

Configuring krb5 Admin Server

# krb5_newrealm

Open /etc/krb5kdc/kadm5.acl it should contain a line like this

*/[email protected] *

The kdc.conf should be adjusted to look like this

[kdcdefaults]
 kdc_ports = 88
 kdc_tcp_ports = 88

[realms]
 HADOOP.COM = {
  #master_key_type = aes256-cts
  acl_file = /var/kerberos/krb5kdc/kadm5.acl
  dict_file = /usr/share/dict/words
  admin_keytab = /var/kerberos/krb5kdc/kadm5.keytab
  supported_enctypes = aes256-cts:normal aes128-cts:normal des3-hmac-sha1:normal arcfour-hmac:normal camellia256-cts:normal camellia128-cts:normal des-hmac-sha1:normal des-cbc-md5:normal des-cbc-crc:normal
}

The krb5.conf should look like this if you are on a multi-node cluster this is the fines you will copy to all other hosts, notice the entry under domain_realm?

[libdefaults]
  renew_lifetime = 7d
  forwardable = true
  default_realm = HADOOP.COM
  ticket_lifetime = 24h
  dns_lookup_realm = false
  dns_lookup_kdc = false
  default_ccache_name = /tmp/krb5cc_%{uid}
  #default_tgs_enctypes = aes des3-cbc-sha1 rc4 des-cbc-md5
  #default_tkt_enctypes = aes des3-cbc-sha1 rc4 des-cbc-md5

[domain_realm]
  .hadoop.com = HADOOP.COM
  hadoop.com = HADOOP.COM

[logging]
  default = FILE:/var/log/krb5kdc.log
  admin_server = FILE:/var/log/kadmind.log
  kdc = FILE:/var/log/krb5kdc.log

[realms]
  HADOOP.COM = {
    admin_server = test.hadoop.com
    kdc = test.hadoop.com
  }

Restart the Kerberos kdc daemons and kerberos admin servers:

# for script in /etc/init.d/krb5*; do $script restart; done

Don't manually create any principle like the "[email protected]"

Go to the ambari kerberos wizard for the domain notice the . (dot)

kdc host = test.hadoop.com
Real Name = HADOOP.COM
Domains = .hadoop.com ,hadoop.com
-----
kadmin host = test.hadoop.com
Admin principal = admin/[email protected]
Admin  password = password set during the creation of kdc database

Now from here just accept the default the keytabs should generate successfully. I have attached files to guide you Procedure to Kerberize HDP 3.1_Part2.pdf Procedure to Kerberize HDP 3.1_Part1.pdf Procedure to Kerberize HDP 3.1_Part3.pdf

Hope that helps please revert if you have any questions

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mazen_elshayeb · ‎05-20-2019

@Geoffrey Shelton Okot

Hello, sorry for keep disturbing you, hope i can solve this issue unfortunately after i followed you steps i got back the same error as before shown bellow and my kerberos wizard configuration as below

note that i didnt create principle [email protected] i only created admin/[email protected] as you mentioned before and actually ambari_hdfs is my cluster name, any solution for this?

Thank you so much in advanced .

ask_bill_brooks · ‎05-20-2019

The above question and the replies below were originally posted in the Community Help Track. On Mon May 20 16:56 UTC 2019, a member of the HCC moderation staff moved it to the Security track. The Community Help Track is intended for questions about using the HCC site itself.

Bill Brooks, Community Moderator
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mazen_elshayeb · ‎05-22-2019

Hello

Any other solution i can do to solve this issue?

Shelton · ‎05-22-2019

@Mazen Elshayeb

Unbelievable ping me on linkedin ,could help with remote

marin99 · ‎01-13-2020

Sorry for the bump. I tried this in the HDP Sandbox and discovered that installing krb5-workstation-1.15.1-37.el7_7.2.x86_64.rpm solved the problem

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Error while enabling kerberos on ambari