Re: Reconfiguring network interfaces
On Sun, Jul 6, 2008 at 8:12 AM, Mel <[EMAIL PROTECTED]> wrote:
> On Sunday 06 July 2008 16:06:49 David Allen wrote:
>
>> I need to make several wholesale changes to a few different systems,
>> and I'd prefer to do it over SSH without losing connectivity where
>> possible. I know I can use ifconfig, or edit /etc/rc.conf directly
>> and reboot, but is there a canonical way to make the changes in
>> /etc/rc.conf and "reload" those changes to ensure everything is in a
>> known state? From what I can determine, running netif stop/start
>> would work, but would require I do that locally.
>
> So, you want to make changes to a machine and confirm they're correct, but
> when they're not, the old settings should be restored:
>
> 0) make sure sshd listens on all ip's ('INADDR_ANY'), not preconfigured set.
>
> # cp -p /etc/rc.conf /etc/rc.conf.BEFORE_CHANGE
> # ${EDITOR} /etc/rc.conf
> # cp -p /etc/rc.conf /etc/rc.conf.CHANGES
>
> Then this script, say /root/bin/testrc.sh:
> =
> #!/bin/sh
>
> /etc/rc.d/netif stop
> sleep 1
> /etc/rc.d/netif start
> # sleep for 5 minutes, should be ample time to re-establish the ssh
> # connection.
> sleep 300
> # We were not killed, this means the connection is faulty
> cp -p /etc/rc.conf.BEFORE_CHANGE /etc/rc.conf
> /etc/rc.d/netif stop
> sleep 1
> /etc/rc.d/netif start
> =
>
> Then run as:
> daemon -p /var/run/testrc.pid /root/bin/testrc.sh
>
> When you can log back in, simply:
> kill `cat /var/run/testrc.pid` ; rm /var/run/testrc.pid
> And rm /etc/rc.conf.BEFORE_CHANGE if you feel comfy.
>
> If you couldn't log back in, inspect /etc/rc.conf.CHANGES and adjust, rm the
> pid file, rince and repeat.
LOL. You've turned what was could have been an awkward scenario and a
cheap and dirty hack into something almost elegant. Me, I'm just
trying to save some trips but I'm sure there's enough of us who have
encountered a situation where physical access is out of the question
or simply not doable.
My thanks to everyone that replied.
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Re: Reconfiguring network interfaces
would work, but would require I do that locally. You could also use the alias featue, adding the new ip, sshing into the new ip, and dump the old ip. ** Though I haven't tried this method personally. ** but i did. ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "[EMAIL PROTECTED]"
Re: Reconfiguring network interfaces
On Sunday 06 July 2008 16:06:49 David Allen wrote:
> I need to make several wholesale changes to a few different systems,
> and I'd prefer to do it over SSH without losing connectivity where
> possible. I know I can use ifconfig, or edit /etc/rc.conf directly
> and reboot, but is there a canonical way to make the changes in
> /etc/rc.conf and "reload" those changes to ensure everything is in a
> known state? From what I can determine, running netif stop/start
> would work, but would require I do that locally.
So, you want to make changes to a machine and confirm they're correct, but
when they're not, the old settings should be restored:
0) make sure sshd listens on all ip's ('INADDR_ANY'), not preconfigured set.
# cp -p /etc/rc.conf /etc/rc.conf.BEFORE_CHANGE
# ${EDITOR} /etc/rc.conf
# cp -p /etc/rc.conf /etc/rc.conf.CHANGES
Then this script, say /root/bin/testrc.sh:
=
#!/bin/sh
/etc/rc.d/netif stop
sleep 1
/etc/rc.d/netif start
# sleep for 5 minutes, should be ample time to re-establish the ssh
# connection.
sleep 300
# We were not killed, this means the connection is faulty
cp -p /etc/rc.conf.BEFORE_CHANGE /etc/rc.conf
/etc/rc.d/netif stop
sleep 1
/etc/rc.d/netif start
=
Then run as:
daemon -p /var/run/testrc.pid /root/bin/testrc.sh
When you can log back in, simply:
kill `cat /var/run/testrc.pid` ; rm /var/run/testrc.pid
And rm /etc/rc.conf.BEFORE_CHANGE if you feel comfy.
If you couldn't log back in, inspect /etc/rc.conf.CHANGES and adjust, rm the
pid file, rince and repeat.
--
Mel
Problem with today's modular software: they start with the modules
and never get to the software part.
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Re: Reconfiguring network interfaces
David Allen wrote: I need to make several wholesale changes to a few different systems, and I'd prefer to do it over SSH without losing connectivity where possible. I know I can use ifconfig, or edit /etc/rc.conf directly and reboot, but is there a canonical way to make the changes in /etc/rc.conf and "reload" those changes to ensure everything is in a known state? From what I can determine, running netif stop/start would work, but would require I do that locally. You could also use the alias featue, adding the new ip, sshing into the new ip, and dump the old ip. ** Though I haven't tried this method personally. ** HTH cya Andrew ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "[EMAIL PROTECTED]" ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "[EMAIL PROTECTED]"
Re: Reconfiguring network interfaces
At 09:06 AM 7/6/2008, David Allen wrote: I need to make several wholesale changes to a few different systems, and I'd prefer to do it over SSH without losing connectivity where possible. I know I can use ifconfig, or edit /etc/rc.conf directly and reboot, but is there a canonical way to make the changes in /etc/rc.conf and "reload" those changes to ensure everything is in a known state? From what I can determine, running netif stop/start would work, but would require I do that locally. You pretty much need to be on the console rather than ssh'd in to make those changes interactively. You can do them remotely via a cron job or at job, but any mistake will require a trip to the console. -Derek -- This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean. ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "[EMAIL PROTECTED]"
Reconfiguring network interfaces
I need to make several wholesale changes to a few different systems, and I'd prefer to do it over SSH without losing connectivity where possible. I know I can use ifconfig, or edit /etc/rc.conf directly and reboot, but is there a canonical way to make the changes in /etc/rc.conf and "reload" those changes to ensure everything is in a known state? From what I can determine, running netif stop/start would work, but would require I do that locally. ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "[EMAIL PROTECTED]"
