Hi Nicholas,

A few reasons:
- Cloning the credentials cache is important when you use ssh, because
ssh will delete the original credentials cache on logout. Cloning the
credentials cache is only possible when krenew is given a command to
execute.
- Because of the cloning krenew needs to change the environment
variable pointing the the credentials cache.
- When running krenew with screen -Dm, the cloned tickets are removed
when they're no longer needed. If you run krenew separately, you will
have to kill it manually.

Best,
 Mika

On Mon, Aug 30, 2010 at 16:38, Nicholas Marriott
<nicholas.marri...@gmail.com> wrote:
> hi
>
> why not just run krenew separately from tmux?
>
>
> On Mon, Aug 30, 2010 at 03:59:20PM +0200, Mika Fischer wrote:
>> Hi,
>>
>> in environments with Kerberos and especially NFS with Kerberos, it is
>> important to keep the Kerberos credentials valid by renewing them at
>> the proper time. Doubly so with screen or tmux sessions since they
>> typically run for a longer time.
>>
>> There is the tool krenew which does this automatically. What it does
>> is it clones the credentials cache, updates the appropriate
>> environment variable, then starts the program and *while the program
>> is running*, renews the credentials at the proper time. If the program
>> exits, krenew exits as well, deleting the cloned credentials cache.
>>
>> It is possible to use screen together with krenew, by starting a
>> screen session like this:
>> krenew -b -- screen -D -m
>>
>> This starts a detached screen session but does not fork, so that
>> krenew works properly.
>>
>> I haven't found a way to achieve this behavior with tmux. Is it
>> currently possible? If so, how? If not, do you think it would be
>> worthwhile to add an option to make it possible? Or do you have any
>> other suggestions how to deal with this issue?
>>
>> Thanks in advance!
>>
>> Best,
>>  Mika
>>
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