Thanks, Rob.I ran the command one another node and it worked for me.

None via FreeIPA-users wrote:

Dear,

I am trying to install replica by "ipa-replica-install replica-info-namenode2.hadoop.gxdwdc.gpg" but it failed,

ipa-replica-install replica-info-namenode2.hadoop.gxdwdc.gpg ... The host namenode2.hadoop.gxdwdc already exists on the master server. You should remove it before procedding: % ipa host-del namenode2.hadoop.gxdwdc

Then I ran "ipa -host-del namenode2.hadoop.gxdwdc" but it still failed, [root@namenode2 ~] ipa host-del namenode2.hadoop.gxdwdc ipa: ERROR: did not receive Kerberos credentials

I thought i need to run "kinit" first, than I ran "kinit admin", it still failed, [root@namenode2 ~] kinit admin kinit: Configuration file does not sepcify default realm when parsing name admin

can anyone inform me how can i overcome this issue?

You need to do the kinit/ipa host-del on an enrolled machine. Another master would be a good place. rob