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Setup-kerberos-LDAP.md

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Secure LDAP enabled single node HDP cluster using Kerberos

  • Install kerberos (usually needed on each node but sandbox only has one)
yum -y install krb5-server krb5-libs krb5-auth-dialog krb5-workstation
  • Configure kerberos
vi /var/lib/ambari-server/resources/scripts/krb5.conf
#edit default realm and realm info as below
default_realm = HORTONWORKS.COM

[realms]
 HORTONWORKS.COM = {
  kdc = sandbox.hortonworks.com
  admin_server = sandbox.hortonworks.com
 }

[domain_realm]
 .hortonworks.com = HORTONWORKS.COM
 hortonworks.com = HORTONWORKS.COM
 #sandbox.hortonworks.com = HORTONWORKS.COM
  • Copy conf file to /etc
cp /var/lib/ambari-server/resources/scripts/krb5.conf /etc
  • Create kerberos db: when asked, enter hortonworks as the key
kdb5_util create -s
  • Start kerberos
/etc/rc.d/init.d/krb5kdc start
/etc/rc.d/init.d/kadmin start

chkconfig krb5kdc on
chkconfig kadmin on
  • Create admin principal
kadmin.local -q "addprinc admin/admin"
  • Update kadm5.acl to make admin an administrator
vi /var/kerberos/krb5kdc/kadm5.acl
*/admin@HORTONWORKS.COM *
  • Restart kerberos services
/etc/rc.d/init.d/krb5kdc restart
/etc/rc.d/init.d/kadmin restart

  • Login to Ambari (if server is not started, execute /root/start_ambari.sh) by opening http://sandbox.hortonworks.com:8080 and then

    • Admin -> Security-> click “Enable Security”
    • On "get started” page, click Next
    • On “Configure Services”, click Next to accept defaults
    • On “Create Principals and Keytabs”, click “Download CSV”. Save to sandbox by “vi /root/host-principal-keytab-list.csv" and pasting the content
    • Without pressing “Apply", go back to terminal

  • add below line to to csv file

vi host-principal-keytab-list.csv
sandbox.hortonworks.com,Hue,hue/sandbox.hortonworks.com@HORTONWORKS.COM,hue.service.keytab,/etc/security/keytabs,hue,hadoop,400
  • Execute below to generate principals, key tabs
/var/lib/ambari-server/resources/scripts/kerberos-setup.sh /root/host-principal-keytab-list.csv ~/.ssh/id_rsa
  • verify keytabs and principals got created (should return at least 17)

if rm.service.keytab was not created re-run with a csv that just contains the line containing rm, otherwise YARN service will not come up

ls -la /etc/security/keytabs/*.keytab | wc -l
  • check that keytab info can be ccessed by klist
klist -ekt /etc/security/keytabs/nn.service.keytab
  • verify you can kinit as hadoop components. This should not return any errors
kinit -kt /etc/security/keytabs/nn.service.keytab nn/sandbox.hortonworks.com@HORTONWORKS.COM
  • Click Apply in Ambari to enable security and restart all the components

If the wizard errors out towards the end due to a component not starting up, its not a problem: you should be able to start it up manually via Ambari

  • Access HDFS as Hue user
su - hue
#Attempt to read HDFS: this should fail as hue user does not have kerberos ticket yet
hadoop fs -ls
#Confirm that the use does not have ticket
klist
#Create a kerberos ticket for the user
kinit -kt /etc/security/keytabs/hue.service.keytab hue/sandbox.hortonworks.com@HORTONWORKS.COM
#verify that hue user can now get ticket and can access HDFS
klist
hadoop fs -ls /user
exit

  • This confirms that we have successfully enabled kerberos on our cluster

  • Open Hue and notice it no longer works e.g. FileBrowser givers error http://sandbox.hortonworks.com:8000

  • Make the config changes needed to make Hue work on a LDAP enbled kerborized cluster using steps here

  • At this point you can not kinit as LDAP users (e.g hr1), but you may not need this if your users will use Knox for webhdfs/ODBC access If you do need this functionality, you will need to configure OpenLDAP to talk to KDC.

A rough guide for this can be found here

  • Extra: On rebooting the VM you may notice that datanode service does not come up on its own and you need to start it manually via Ambari To automate this, change startup script to start data node as root:
vi /usr/lib/hue/tools/start_scripts/start_deps.mf

#find the line containing 'conf start datanode' and replace with below
export HADOOP_LIBEXEC_DIR=/usr/lib/hadoop/libexec && /usr/lib/hadoop/sbin/hadoop-daemon.sh --config /etc/hadoop/conf start datanode,\