Open Stack

I built a devstack cluster with neutron today, and the bug seemed disappear. So I guess it is a nova-network bug. Anybody met this before? VMs randomly lost network connection for a while from time to time if you are using nova-network.

-Ken

-----Original Message-----
From: Chen, Ken [mailto:ken.chen at intel.com] 
Sent: Wednesday, June 10, 2015 10:57 AM
To: openstack at lists.openstack.org
Subject: [Openstack] [Sahara] [Network] instance cannot be connected some time after created

Hi all,
Recently I am using Sahara/Heat to create clusters in my own devstack setup (we do not install neutron and n-net is used). Some instances randomly could not be connected via ssh with "Broken pipe" messages, and reconnecting to it will report "Permission denied" (other connections like html are also disconnected). This will cause the whole cluster down. 

ubuntu at c1-cdhmaster54-001:~$ Write failed: Broken pipe stack at ken-stack:~$ ssh -i /home/stack/ken.key -o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null -l ubuntu 192.168.234.226
Warning: Permanently added '192.168.234.226' (ECDSA) to the list of known hosts.
Permission denied (publickey).

However, after several minutes, the instance can be connected again! 
stack at ken-stack:~$ ssh -i /home/stack/ken.key -o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null -l ubuntu 192.168.234.226
Warning: Permanently added '192.168.234.226' (ECDSA) to the list of known hosts.
Welcome to Ubuntu 12.04.5 LTS (GNU/Linux 3.2.0-84-virtual x86_64)

 * Documentation:  https://help.ubuntu.com/

  System information as of Wed Jun 10 02:52:59 UTC 2015

  System load:  0.29               Processes:           101
  Usage of /:   13.4% of 37.51GB   Users logged in:     1
  Memory usage: 49%                IP address for eth0: 10.11.12.2
  Swap usage:   0%

  Graph this data and manage this system at:
    https://landscape.canonical.com/

  Get cloud support with Ubuntu Advantage Cloud Guest:
    http://www.ubuntu.com/business/services/cloud

0 packages can be updated.
0 updates are security updates.

Last login: Wed Jun 10 02:52:09 2015 from 192.168.234.226 ubuntu at c1-cdhmaster54-001:~$

It is quite weird. Have any of you met this before, and give any suggestions? Thanks a lot.

-Ken

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