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Is it possible to telnet into a system booted from CDROM into single user
mode? ('boot cdrom -s') If so, how is it done? How can one make the
miniroot writeable? To execute 'svcadm enable inetd' requires a writeable
root, right?

I have a headless V480. I 'boot cdrom -s' using the RSC console. I
configure a network interface. If I try to enable inetd, I get:

# svcadm enable inetd
svcadm: svc:/network/inetd:default: Repository read-only.


I am curious whether it is possible to be able to telnet in to that machine.

Thank you.

Regards,

DG

In article <11n4l0u5lrfob79@corp.supernews.com>,
"David E. Grove" <david_grove@correct.state.ak.us> wrote:

> Is it possible to telnet into a system booted from CDROM into single user
> mode? ('boot cdrom -s') If so, how is it done? How can one make the
> miniroot writeable? To execute 'svcadm enable inetd' requires a writeable
> root, right?
>
> I have a headless V480. I 'boot cdrom -s' using the RSC console. I
> configure a network interface. If I try to enable inetd, I get:
>
> # svcadm enable inetd
> svcadm: svc:/network/inetd:default: Repository read-only.
>
>
> I am curious whether it is possible to be able to telnet in to that machine.
>
> Thank you.
>
> Regards,
>
> DG

Not AFAIK. The mini-root isn't running any sort of network stack nor
can it. So, I think you'll have to rethink your approach. What problem
are you trying to solve here?

--
DeeDee, don't press that button! DeeDee! NO! Dee...

"David E. Grove" <david_grove@correct.state.ak.us> wrote in message
news:11n4l0u5lrfob79@corp.supernews.com...
> Is it possible to telnet into a system booted from CDROM into single user
> mode? ('boot cdrom -s') If so, how is it done? How can one make the
> miniroot writeable? To execute 'svcadm enable inetd' requires a writeable
> root, right?

Well, if you think about it: boot *cdrom* -s

This means your root fs is on the CD you're booting from. So it isn't
writable...

> I have a headless V480. I 'boot cdrom -s' using the RSC console. I
> configure a network interface. If I try to enable inetd, I get:
>
> # svcadm enable inetd
> svcadm: svc:/network/inetd:default: Repository read-only.

Again you're booting from a CD-*ROM*.

However, the single-user mode in general does not mean you can't configure a
network interface or run network services. Your basic problem is you can't
make a configuration change with a read-only root fs. If you're willing to
invest the time and have the appropriate infrastructure, you could
conceivably make your own bootable CD image which uses DHCP / BOOTP to
obtain network configuration, initialise an interface and run some service
(such as telnet).

Better still, setup a jumpstart server and do: boot net -s.

This will bring you to single-user (without performing any kind of
installation). And since your root fs will then be a NFS mount (which, btw,
implies a configured network interface), you can either pre-configure the
required network service(s) or (again, not recommended) make NFS image
writable and perform any configuration on the fly (using anon=0 as a share
option).

--
-- ICE
--

Michael Vilain <vilain@spamcop.net> writes:
> Not AFAIK. The mini-root isn't running any sort of network stack nor
> can it. So, I think you'll have to rethink your approach. What problem
> are you trying to solve here?

The miniroot is actually just a reduced set of Solaris. It has the
full TCP/IP stack, and uses that normally during a network install.

I agree with the last question, though.

--
James Carlson, KISS Network <james.d.carlson@sun.com>
Sun Microsystems / 1 Network Drive 71.232W Vox +1 781 442 2084
MS UBUR02-212 / Burlington MA 01803-2757 42.496N Fax +1 781 442 1677

ICE wrote:
> "David E. Grove" <david_grove@correct.state.ak.us> wrote in message
> news:11n4l0u5lrfob79@corp.supernews.com...
>
>>Is it possible to telnet into a system booted from CDROM into single user
>>mode? ('boot cdrom -s') If so, how is it done? How can one make the
>>miniroot writeable? To execute 'svcadm enable inetd' requires a writeable
>>root, right?
>
>
> Well, if you think about it: boot *cdrom* -s
>
> This means your root fs is on the CD you're booting from. So it isn't
> writable...
>
>
>>I have a headless V480. I 'boot cdrom -s' using the RSC console. I
>>configure a network interface. If I try to enable inetd, I get:
>>
>># svcadm enable inetd
>>svcadm: svc:/network/inetd:default: Repository read-only.
>
>
> Again you're booting from a CD-*ROM*.

Hold on a sec ... see the "-t" switch to "svcadm enable ..." (might want
to look at the "-r" switch too).

svcadm(1M)

enable [-rst] {FMRI|pattern}...
....
If the -t option is specified, svcadm temporarily enables each service
instance. Temporary enable only lasts until reboot. This action requires
permission to modify the “restarter_actions” property group of the
service instance (see smf_security(5)).
....

>
> However, the single-user mode in general does not mean you can't configure a
> network interface or run network services. Your basic problem is you can't
> make a configuration change with a read-only root fs. If you're willing to

Right, he can't make a *permanent* change like that while online with a
read-only fs ... see above.

> invest the time and have the appropriate infrastructure, you could
> conceivably make your own bootable CD image which uses DHCP / BOOTP to
> obtain network configuration, initialise an interface and run some service
> (such as telnet).
>
> Better still, setup a jumpstart server and do: boot net -s.
>
> This will bring you to single-user (without performing any kind of
> installation). And since your root fs will then be a NFS mount (which, btw,
> implies a configured network interface), you can either pre-configure the
> required network service(s) or (again, not recommended) make NFS image
> writable and perform any configuration on the fly (using anon=0 as a share
> option).
>

Thank you all for your responses.

I had some difficulty with installing a patch. I had to 'boot cdrom -s' to
fix it.

While I was "monkeying around" I was just curious. I could use ifconfig to
get network access, but I also wondered about telneting in. Just a learning
exercise.

Thanks again for you helpful comments.

DG