[kwlug-disc] Problem reaching server

Fri Mar 13 09:32:45 EDT 2015

OK, understood.  I never added br0 myself, but who knows if it's added by
some process..  I'll have a look tonight and see what's in there.  I'll
backup the config and play with different scenarios.

I had a thought in the middle of the night last night, which I haven't had
a chance to confirm yet.. I have 2 NICs on this box, call them eth0 and
eth1, naturally.  I can't connect to eth0 since the upgrades and reboot.
But I can talk to the guest virtual machines, which I believe use eth2 (I
have to check for sure).  Could it be that eth0 is physically pooched, or
that something in the upgrades (or reboots) turned eth0 off?  The last time
I did ifconfig it looked to me like both NICs were still configured
correctly.

On Fri, 13 Mar 2015 at 08:21 Khalid Baheyeldin <kb at 2bits.com> wrote:

> Not sure if I was clear the first time or not.
>
> Adding br0 is what caused my physical server to hang on reboot, though it
> worked fine until that.
>
> This is NOT a solution to anything.
>
> On Fri, Mar 13, 2015 at 8:19 AM, CrankyOldBugger <
> crankyoldbugger at gmail.com> wrote:
>
>> Ok, that was my mistake.  I'll do the auto br0 tonight.  Thanks for the
>> idea.
>>
>>
>> On Fri, 13 Mar 2015 at 05:47 Khalid Baheyeldin <kb at 2bits.com> wrote:
>>
>>> On Thu, Mar 12, 2015 at 11:14 PM, CrankyOldBugger <
>>> crankyoldbugger at gmail.com> wrote:
>>>
>>>> That didn't seem to help.  I commented out all of the lines below
>>>> virbr0.  Now I can't reach the VMs either.
>>>>
>>>> By bridging, I assumed you mean virbr0, which we all worked so hard to
>>>> set up a few weeks ago.
>>>>
>>>
>>> No. It was not virbr0.
>>>
>>> It was:
>>>
>>> auto br0
>>> iface br0 inet dhcp
>>>   bridge_ports eth0
>>>
>>> Again, I am using libvirt with kvm underneath, not any other
>>> virtualization stack.
>>>
>>> I don't understand why I've been merrily rebooting since then but all of
>>>> a sudden it starts to fail.  Just weird.
>>>>
>>>
>>> In that case, it is a totally different problem. Mine never booted
>>> successfully. In your case, it seems intermittent.
>>>
>>>
>>>>
>>>> I'll fiddle with it some more tomorrow.
>>>>
>>>>
>>>> On Thu, 12 Mar 2015 at 19:05 Khalid Baheyeldin <kb at 2bits.com> wrote:
>>>>
>>>>> That happened to me when I had bridging on the physical host that has
>>>>> virtualization. Things work, until you reboot, then server is not reachable.
>>>>>
>>>>> I didn't figure out why, and ended up abandoning the bridge I added to
>>>>> /etc/network/interfaces, and using the default networking that is setup by
>>>>> libvirt.
>>>>>
>>>>> On Thu, Mar 12, 2015 at 6:51 PM, CrankyOldBugger <
>>>>> crankyoldbugger at gmail.com> wrote:
>>>>>
>>>>>> I'm puzzled...  I rebooted my Ubuntu server this morning (as updates
>>>>>> needed a reboot) and now I can't reach it.
>>>>>>
>>>>>> Here's what I determined:
>>>>>>
>>>>>> It was running fine before the reboot!
>>>>>> I can't ping the server from another machine on the same subnet.
>>>>>> I can't SSH to the server.
>>>>>> SSH is running on the server.
>>>>>> I can't telnet to the server
>>>>>> I can ssh from the server to itself, so ssh is running and listening
>>>>>> on 22.
>>>>>> If I try to ssh from another linux box on the same subnet, using
>>>>>> either hostname or IP, I get "No route to host".
>>>>>> Traceroute should only one hop, that being the client I started
>>>>>> traceroute from, but that line ends in !H, which I believe means can't
>>>>>> connect.
>>>>>> IP address is fine.
>>>>>> I can't ping out from the server.
>>>>>> Now here's the fun part: I have two virtual machines hosted on this
>>>>>> server, and they're both running fine.  I can connect to them and they can
>>>>>> connect to the internet.
>>>>>>
>>>>>> Not sure what to think at this point.  Anyone have any ideas?
>>>>>>
>>>>>>
>>>>>> _______________________________________________
>>>>>> kwlug-disc mailing list
>>>>>> kwlug-disc at kwlug.org
>>>>>> http://kwlug.org/mailman/listinfo/kwlug-disc_kwlug.org
>>>>>>
>>>>>>
>>>>>
>>>>>
>>>>> --
>>>>> Khalid M. Baheyeldin
>>>>> 2bits.com, Inc.
>>>>> Fast Reliable Drupal
>>>>> Drupal optimization, development, customization and consulting.
>>>>> Simplicity is prerequisite for reliability. --  Edsger W.Dijkstra
>>>>> Simplicity is the ultimate sophistication. --   Leonardo da Vinci
>>>>> For every complex problem, there is an answer that is clear, simple,
>>>>> and wrong." -- H.L. Mencken
>>>>>  _______________________________________________
>>>>> kwlug-disc mailing list
>>>>> kwlug-disc at kwlug.org
>>>>> http://kwlug.org/mailman/listinfo/kwlug-disc_kwlug.org
>>>>>
>>>>
>>>> _______________________________________________
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>>>>
>>>>
>>>
>>>
>>> --
>>> Khalid M. Baheyeldin
>>> 2bits.com, Inc.
>>> Fast Reliable Drupal
>>> Drupal optimization, development, customization and consulting.
>>> Simplicity is prerequisite for reliability. --  Edsger W.Dijkstra
>>> Simplicity is the ultimate sophistication. --   Leonardo da Vinci
>>> For every complex problem, there is an answer that is clear, simple, and
>>> wrong." -- H.L. Mencken
>>>  _______________________________________________
>>> kwlug-disc mailing list
>>> kwlug-disc at kwlug.org
>>> http://kwlug.org/mailman/listinfo/kwlug-disc_kwlug.org
>>>
>>
>> _______________________________________________
>> kwlug-disc mailing list
>> kwlug-disc at kwlug.org
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>>
>>
>
>
> --
> Khalid M. Baheyeldin
> 2bits.com, Inc.
> Fast Reliable Drupal
> Drupal optimization, development, customization and consulting.
> Simplicity is prerequisite for reliability. --  Edsger W.Dijkstra
> Simplicity is the ultimate sophistication. --   Leonardo da Vinci
> For every complex problem, there is an answer that is clear, simple, and
> wrong." -- H.L. Mencken
>  _______________________________________________
> kwlug-disc mailing list
> kwlug-disc at kwlug.org
> http://kwlug.org/mailman/listinfo/kwlug-disc_kwlug.org
>
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