Date: Wed, 9 Aug 2017 13:14:20 -0600 From: Alan Somers <asomers@freebsd.org> To: Giulio Ferro <auryn@zirakzigil.org> Cc: "freebsd-hackers@freebsd.org" <freebsd-hackers@freebsd.org> Subject: Re: devd in jail Message-ID: <CAOtMX2g7PR9S7v%2BrUXwBeQUPDFfJy2zZwAvg7q5ze99jDF4hmA@mail.gmail.com> In-Reply-To: <e03a6040-1322-c82c-0e96-49c474188d5c@zirakzigil.org> References: <e03a6040-1322-c82c-0e96-49c474188d5c@zirakzigil.org>
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On Wed, Aug 9, 2017 at 12:47 PM, Giulio Ferro <auryn@zirakzigil.org> wrote:
> Hello all,
>
> Setup : 11.1-STABLE FreeBSD 11.1-STABLE #0 r321925M amd64
>
>
> I'm trying to create a fully virtualized desktop enviroment in a jail by
> means of installing there
> a xrdp-devel server + Xorg installation (xorg + xorgrdp).
>
> Everything seems to work until the moment when the X server actually tries
> to come up (after I choose session=xorg, username + password)
> In the X logs in the jail, in fact, I have this error:
>
> ...
> [ 9768.824] (EE) config/devd: fail to connect to devd
> [ 9768.824] [config] failed to initialise devd
>
>
> I've checked on the host machine, and I don't have that error as everything
> works fine there...
>
> In my jail, I've setup the devfs like this (/etc/jail.conf in the host):
>
> ---
> exec.start="/bin/sh /etc/rc";
> exec.stop="/bin/sh /etc/rc.shutdown";
> exec.clean;
> mount.devfs;
> devfs_ruleset=1;
>
> path="/usr/home/jail/$name";
>
> myjail {
> host.hostname="myjail.me.com";
> vnet;
> vnet.interface = epair0b, epair1b;
> persist;
> }
> ---
>
>
> and in the /etc/devfs.conf everythink is commented out.
>
> In the /dev directory in the jail, I get both the devctl and devctl2
> devices.
>
> As the devd demon is not running in the jail, I've tried adding
> devd_enable="YES"
>
> in the rc.conf (jail), but when I try to start it, I get:
>
> # /etc/rc.d/devd start
> Starting devd.
> devd: Can't open devctl device /dev/devctl: Device busy
> /etc/rc.d/devd: WARNING: failed to start devd
>
>
> Do you know if I'm doing something wrong, or there's a proper way to have
> devd running in the jail?
>
> I've thought that maybe I should use the devtcl2 device, as the devctl is
> used by the host,
> but I don't know how to specify that to devd...
>
> Thanks in advance for your help.
>
> Giulio
Unfortunately, you're not going to be able to run devd(8) in the jail.
/dev/devctl can be opened by only one reader at a time, and that
reader is always devd(8). /dev/devctl2 is actually a completely
different device with a totally different interface. Apologies for
the confusing names. But you may not need to run a totally separate
instance of devd. The X server is probably trying to open either
/var/run/devd.pipe or /var/run/devd.seqpacket.pipe. ktrace would tell
you which. If you can bridge those sockets into the jail, then X
would probably run.
-Alan
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