jexec -h hostname option
Bjoern A. Zeeb
bzeeb-lists at lists.zabbadoz.net
Thu Dec 22 19:31:21 UTC 2011
On 22. Dec 2011, at 16:03 , Dan The Man wrote:
>
>
> On Thu, 22 Dec 2011, Bjoern A. Zeeb wrote:
>
>>
>> On 22. Dec 2011, at 14:03 , Dan The Man wrote:
>>
>>>
>>>
>>> http://www.freebsd.org/relnotes/CURRENT/relnotes/new.html#USERLAND
>>> jexec(8) now supports -h hostname option to specify the jail where the command will be executed.
>>>
>>
>> Oh wow. That's all but current.
>>
>>
>>>
>>> When was this added? I don't see it functioning:
>>
>> 3 years 6 months ago and it was shortly afterwards removed again as neither
>> a) the hostname not b) the ip addresses needed to be unique anymore with
>> multi-IP jails (a) not even before that). The suggested replacement was
>> -n to name the jails yourself. I think the uniqueness limit has since been
>> removed on that as well but the option has stayed and by default is the
>> jail ID these days and it's name=<..> in the modern syntax.
>>
>> /bz
>>
>> --
>> Bjoern A. Zeeb You have to have visions!
>> Stop bit received. Insert coin for new address family.
>>
>>
>
> Yeah, seems problematic, from what I have seen so far everytime you stop and restart the jail it gets a different jail ID, which would make it difficult to cron anything to execute in the jail. I can't seem to get jexec to take anything but jail id.
>
> Came up with a temporary type solution assuming you have only 1 jail:
> JAILID=`/usr/sbin/jls -n name|cut -d '=' -f 2`; /usr/sbin/jexec $JAILID command
>
> I can see this being problematic for a long term/portable solution.
jexec on a name works fine if you start the jail with a name as well.
See the jail(8) man page on how to either use -n or name=.
jail -n foo ...
or
jail name=foo ...
then jexec foo ...
--
Bjoern A. Zeeb You have to have visions!
Stop bit received. Insert coin for new address family.
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