How to connect a jail to the web ?

Roland Smith rsmith at
Tue Aug 10 13:08:37 UTC 2010

On Tue, Aug 10, 2010 at 11:01:24AM +0000, Brice ERRANDONEA wrote:
> Hello,
> I've just created my first FreeBSD jail in order to install a web server
> inside.  But I don't know how to connect it to the web. When I try pinging a
> http website, it doesn't work. Of course, it works when I do it from outside
> the jail.

There are a couple of things you need to keep in mind.

  - The IP address you're using for a jail is usually an alias for an existing
    interface. I think this is done to make routing easier. My system is
    configured as a gateway, and I've aliased the IP adresses for my jails to
    the interaface of the internal trusted network.
  - You should really use the rc interface for starting jails; it's much easier. 

> Another problem, probably linked to the first one, I can't run rc within the 
> jail, even as the jail's root. It says : permission denied.

See below.
> Here's how I built and started my jail. I had already run make buildworld when 
> upgrading to 8.1 release :
> # mkdir /usr/prison
> # cd /usr/src
> # make installworld DESTDIR=/usr/prison
> # make distribution DESTDIR=/usr/prison

Do not forget to create an empty /etc/fstab in your jail;

  # touch /usr/prison/etc/fstab

You'll also need to create an appropriate /etc/rc.conf file in the jail. The
following should be a starting point;


> # mount -t devfs devfs /usr/prison/dev
> # jail -c path=/usr/prison host.hostname=ServeurWeb ip4.addr= persist
> # jail /usr/prison ServeurWeb csh

You should use the full path name of the program you want to run.

  # jail /usr/prison ServeurWeb /bin/csh

If you want to start the rc system in the jail;

 # jail /usr/prison ServeurWeb /bin/sh /etc/rc

I've detailed my setpup on a webpage. Maybe it will be of use to you;

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