- What Is A Keytab File
- Keytab File Location
- How To Generate Keytab File For Mac Windows 10
- How To Generate Keytab File For Mac Pro
To generate the keytab file and map the service principal name: Note: These steps assume that the server user is krbsrv and the domain is example.com. Open a command window by selecting Start, Run and then entering cmd in the Open field. Oct 16, 2017 Parameter Description /out: Specifies the name of the Kerberos version 5.keytab file to generate. Note: This is the.keytab file you transfer to a computer that isn't running the Windows operating system, and then replace or merge with your existing.keytab file, /Etc/Krb5.keytab. /princ: Specifies the principal name in the form.
1.6. Creating Service Principals and Keytab Files for Hadoop
Each service and sub-service in Hadoop must have its own principal. A principal name in a given realm consists of a primary name and an instance name, which in this case is the FQDN of the host that runs that service. As services do not login with a password to acquire their tickets, their principal's authentication credentials are stored in a keytab file, which is extracted from the Kerberos database and stored locally with the service principal on the service component host.
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![How To Generate Keytab File For Mac How To Generate Keytab File For Mac](https://flylib.com/books/4/395/1/html/2/images/220fig01.jpg)
First you must create the principal, using mandatory naming conventions.
What Is A Keytab File
Then you must create the keytab file with that principal's information and copy the file to the keytab directory on the appropriate service host.
Keytab File Location
Note |
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Principals can be created either on the KDC machine itself or through the network, using an “admin” principal. The following instructions assume you are using the KDC machine and using the kadmin.local command line administration utility. Using kadmin.local on the KDC machine allows you to create principals without needing to create a separate 'admin' principal before you start. |
How To Generate Keytab File For Mac Windows 10
![For For](https://prasanthkothuri.files.wordpress.com/2016/02/hivekerberosconnection.jpg?w=656)
How To Generate Keytab File For Mac Pro
- Open the
kadmin.local
utility on the KDC machine - Create the service principals:The randkey is used to generate the password.Note that in the example each service principal's primary name has appended to it the instance name, the FQDN of the host on which it runs. This provides a unique principal name for services that run on multiple hosts, like DataNodes and TaskTrackers. The addition of the hostname serves to distinguish, for example, a request from DataNode A from a request from DataNode B. This is important for two reasons:
- If the Kerberos credentials for one DataNode are compromised, it does not automatically lead to all DataNodes being compromised
- If multiple DataNodes have exactly the same principal and are simultaneously connecting to the NameNode, and if the Kerberos authenticator being sent happens to have same timestamp, then the authentication would be rejected as a replay request.
Theprimary_name
part of the name must match the values in the table below:Table 13.2. Service PrincipalsService Component Mandatory Principal Name HDFSNameNode nn
/$FQDN
HDFSNameNode HTTP HTTP
/$FQDN
HDFS SecondaryNameNode nn
/$FQDN
HDFS SecondaryNameNode HTTP HTTP
/$FQDN
HDFSDataNode dn
/$FQDN
MapReduce JobTracker jt
/$FQDN
MapReduce TaskTracker tt
/$FQDN
OozieOozie Server oozie
/$FQDN
OozieOozie HTTP HTTP
/$FQDN
HiveHive MetastoreHiveServer2hive
/$FQDN
Hive WebHCat HTTP
/$FQDN
HBaseMasterServer hbase
/$FQDN
HBaseRegionServer hbase
/$FQDN
ZooKeeperZooKeeper zookeeper
/$FQDN
Nagios Server Nagios nagios
/$FQDN
For example: To create the principal for a DataNode service, issue this command: - In addition you must create three special principals for Ambari's own use. These principals do not need the FQDN appended to the primary name:Table 13.3. Ambari Principals
User Mandatory Principal Name Ambari Smoke Test User ambari-user
Ambari HDFS Test User hdfs
Ambari HBase Test User hbase
- Once the principals are created in the database, you can extract the related keytab files for transfer to the appropriate host:You must use the mandatory names for the
$keytab_file_name
variable shown in this table.Table 13.4. Service Keytab File NamesComponent Principal Name Mandatory Keytab File Name NameNodenn
/$FQDN
nn.service.keytab
NameNode HTTP HTTP
/$FQDN
spnego.service.keytab
SecondaryNameNodenn
/$FQDN
nn.service.keytab
SecondaryNameNode HTTP HTTP
/$FQDN
spnego.service.keytab
DataNode dn
/$FQDN
dn.service.keytab
Pdr exe has stopped working. JobTrackerjt
/$FQDN
jt.service.keytab
TaskTrackertt
/$FQDN
tt.service.keytab
Oozie Server oozie
/$FQDN
oozie.service.keytab
Oozie HTTP HTTP
/$FQDN
spnego.service.keytab
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/$FQDN
hive.service.keytab
WebHCat HTTP
/$FQDN
spnego.service.keytab
HBase Master Serverhbase
/$FQDN
hbase.service.keytab
HBase RegionServerhbase
/$FQDN
hbase.service.keytab
ZooKeeperzookeeper
/$FQDN
zk.service.keytab
Nagios Server nagios
/$FQDN
nagios.service.keytab
Ambari Smoke Test User ambari-user
smokeuser.headless.keytab
Ambari HDFS Test User hdfs
hdfs.headless.keytab
Ambari HBase Test User hbase
hbase.headless.keytab
For example: To create the keytab files for NameNode HTTP, issue this command:Note If you have a large cluster, you may want to create a script to automate creating your principals and keytabs. To help with that, you can download a CSV-formatted file of all the required principal names and keytab files from the Ambari Web GUI. Select Admin view->Security->Enable Security-> and run the Add security wizard, using the default values. At the bottom of the third page, Create Principals and Keytabs, click Download CSV. Then use the Back button to exit the wizard until you have finished your setup. - When the keytab files have been created, on each host create a directory for them and set appropriate permissions.
- Copy the appropriate keytab file to each host. If a host runs more than one component (for example, both TaskTracker and DataNode), copy keytabs for both components. The Ambari Test User keytabs should be copied to the NameNode host.
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- On the HDFS NameNode and SecondaryNameNode hosts:
- On the HDFS NameNode host, for the Ambari Test Users:
- On each host that runs an HDFS DataNode:
- On the host that runs the MapReduce JobTracker:
- On each host that runs a MapReduce TaskTracker:
- On the host that runs the Oozie Server:
- On the host that runs the Hive Metastore, HiveServer2 and WebHCat:
- On hosts that run the HBase MasterServer, RegionServer and ZooKeeper:
- On the host that runs the Nagios server:
- Verify that the correct keytab files and principals are associated with the correct service using the
klist
command. For example, on the NameNode:Do this on each respective service in your cluster.