Changing jail's IP automatically

[Grzegorz Junka]

Probably it would, I didn't try. Is this is the proper way of solving 
this issue?


On 03/09/2016 15:49, James Lodge wrote:
> Would PF and NAT not work for you? NAT to the WLAN0 IP (DHCP assigned) using PF macros and have a separate subnet for your jails? This would be PAT so you might have issues with accessing services inbound if you're using the same port in multiple jails. Just an idea.....
>
> Sent from my iPad
>
>> On 3 Sep 2016, at 16:33, James Gritton <jamie at freebsd.org> wrote:
>>
>>> On 2016-09-02 15:08, Grzegorz Junka wrote:
>>> I am using a jail on my laptop and I often connect to different
>>> WiFi's, which of course assign different IPs to my laptop. I set up
>>> the jail by adding an alias to wlan0 and I need to update the IP every
>>> time I switch the WiFi network. Is it possible to create a jail with
>>> IP assigned dynamically, e.g. from DHCP, or at least switch between
>>> predefined IPs more easily than by editing /etc/jail.conf?
>> You can always add addresses later.  I would create the jail without any IP address specified in jail.conf, and then have a exec.poststart script that sets the address using something like "jail -m name=foo ip4.addr=1.2.3.4".  And similarly when the network switches, it would need to trigger a similar script that resets the address.
>>
>> It's a little more complicated that than though: network daemons will be bound to the old address after the switch, so you'll need to run the proper service(8) commands to restart those, in the right order.  Or depending on the service, maybe a kick of some sort (like a kill -1) would do the trick.
>>
>> And at start time, if the jail has no IP address of its own, anything it runs will use the regular system IP addresses.  That's definitely not what you want.  Unfortunately, jail(8) doesn't have a way to run a script in the system environment after the jail is created but before exec.start is run.  That would be the right place to set the initial address.  So barring that, you may want to have network services not started up at all, until this poststart script sets the address.  So it's still not a simple issue.
>>
>> - Jamie
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