Forum Discussion

Hooray888's avatar
Hooray888
Level 3
5 years ago

After change the client hostname, the client backups are still working fine with old hostname

Hello Guys, Today I made one testing --- change one NBU8.2 Linux client hostname. And then observe the client backups status. This NBU8.2 Linux client backups always work fine before change the IP ...
  • sdo's avatar
    sdo
    5 years ago

    Hi - the fact that client name change does not break certification must be by design.  With certification when clients are initially installed they select (self-create and self-assign) for themselves a "host GUID".  And it is this "host GUID" which is certificated, not a client name.  Hence clients still work after changing name.

sdo's avatar
sdo
Moderator

All NetBackup entities, i.e. Master or Media or Client, all maintain their own private cache of names and IPs in case DNS goes AWOL.  So, when changing names of anything, then you always need to execute this command, and usually it is best to execute this command on all three layers, i.e Master, all Medias and Appliances, and on the client itself:

bpclntcmd -clear_host_cache

 

Hooray888's avatar
Hooray888
Level 3
5 years ago

Hi sdo 

Thanks for your reply first.  Yes, I executed the following command on the Master, Media servers and client. 

bpclntcmd -clear_host_cache

 

Consequently, the backups still worked fine on the Master system.  I am confused that the backups should have failed without renewing the certificate after change the hostname of the client. 

  • sdo's avatar
    sdo
    Moderator
    5 years ago

    Hi - the fact that client name change does not break certification must be by design.  With certification when clients are initially installed they select (self-create and self-assign) for themselves a "host GUID".  And it is this "host GUID" which is certificated, not a client name.  Hence clients still work after changing name.

    • Hooray888's avatar
      Hooray888
      Level 3
      5 years ago

      Hi sdo 

      Got it. Thanks for your good explanation.