Environment: I have joined a few of my RHEL 7.3 boxes with MS AD domain using realmd/sssd. I have allowed only members of a few allowed groups can login to the box. Credentials caching is disabled. All works well without any problem.

What I need to achieve next: I want one Windows SMB share to be permanently mounted to the Linux (in the fstab or else) using Kerberos(passwordless).

What I have achieved so far: I am able to mount the Windows SMB path, but it expires when the manually generated TGT ticket expires.

How I’m doing it: I generate TGT ticket using ‘kinit’

then TGT ticket for cifs mount using kvnp

Then making an entry in the fstab with ‘sec=krb5’ and providing the uid of the desired service account.

Using the above the SMB share is mounted successfully but expires in 9 hours upon expiration of the TGT ticket.

Please suggest if there is something that I can do to make the mount permanent.

Note: I'm not modifying the TGT ticket expiration time thinking it may cause some security or compliance concerns.(please, correct me if I'm wrong).

  • @JeffSchaller Thanks, duplicate text removed. I asked this question in StackExchange and was suggested to post here. And the copy/paste error happened. Jan 15, 2018 at 13:05

1 Answer 1


As long as you are using the same default principal name that is used in your cache you should be able to just create a reoccurring cronjob that runs kinit with your keytab assuming you already have one created and stored securely.

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