Questions about the output of jls

James Gritton jamie at
Sun Dec 13 18:16:18 UTC 2020

On 2020-12-13 08:16, Kyle Evans wrote:
> On Sun, Dec 13, 2020 at 10:04 AM <mj-mailinglist at> wrote:
>> Hi,
>> I habe a current system, where i have current and 12.2-STABLE jails. 
>> Checking with jls, i get this output:
>> root at fbsd13:~ # jls -h jid name ip4.addr host.hostname vnet osrelease 
>> path | column -t
>> jid  name  ip4.addr      host.hostname  vnet  osrelease     path
>> 8    j0  j0.local       2     13.0-CURRENT  /jails/j0
>> 10   j1    -             j1.local       1     13.0-CURRENT  /jails/j1
>> 12   j2    -             j2.local       1     13.0-CURRENT  /jails/j2
>> the jails are running this versions:
>> root at fbsd13:~ # jexec -l j0 freebsd-version -u
>> 12.2-STABLE
>> root at fbsd13:~ # jexec -l j1 freebsd-version -u
>> 13.0-CURRENT
>> root at fbsd13:~ # jexec -l j2 freebsd-version -u
>> 12.2-STABLE
>> What is "osrelease"? Looking at the name, i would have guessed, it is 
>> the
>> version of the freebsd userland, running in the jail. But it does't 
>> seem so.
>> j1 and j2 are VNET jails, so it seems the 1 in the vnet column 
>> signifies this,
>> j0 is a "standard" jail using the hosts network stack, so the 2 stands 
>> for standard?
> Hi,
> osrelease is what the jail sees as kern.osrelease and uname -r (see:
> jail(8)) (i.e. kernel version); it's either specified during jail
> creation or inherited from the parent prison if none is specified.
> It looks like it's exporting a jailsys int for vnet, so these 
> correspond to:
> So 2 is 'use parent vnet', 1 is 'new one created' -- I don't see this
> described in either jls(1) or jail(8), it'd probably be nice if we
> translated jailsys ints into "new"/"inherit" since one specifies
> "new"/"inherit" for them during creation.

True, that would be more human-readable.  For that matter, I could 
report booleans (such as allow.whatever) as "true" or "false" as well.  
In both cases, the strings pass back to jail(8) OK, but I wonder if 
there are any scripts out there that actually use those values in their 
numeric form.

- Jamie

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