[kwlug-disc] Problem reaching server

[Jeff Smith]

I found the problem.. it's the latest kernel.  I booted to grub and called up an older kernel (3.16.0-30-generic) and all behaves as advertised.
Now to fix it up so it always boots from the old kernel and we're back in business.


Date: Fri, 13 Mar 2015 08:21:04 -0400
From: kb at 2bits.com
To: kwlug-disc at kwlug.org
Subject: Re: [kwlug-disc] Problem reaching server

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 serverI 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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-- 
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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-- 
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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