[kwlug-disc] Problem reaching server

[Khalid Baheyeldin]

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?
>>>
>>>
>>> _______________________________________________
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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
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>
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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
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