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2020-03-29 14:58:27 -0500 answered a question How can we overcome any type of sudden server failure?

It depends. For e.g a) Nova Compute: then you can configure the triggering of evacauation and migration procedure of the VMs to an healthy compute node. You can read more about it here:

b) Controllers: They run in a quorum and by deafult there are 3 running instances. So failure of any one of the server causes no issues.

c) Storage ( for e.g. volume storage in CEPH): Here the data is duplicated to additional server nodes in a cluster by replication or erasure coding. In ceph by default there are three server nodes in a cluster. So even if any one of the nodes fails, VM can still find its data from the remaining two health nodes of the cluster

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2019-11-24 10:07:12 -0500 asked a question Controller HA with 3 Nodes in a Quorum

Considering the following use case below, what would be default behaviour: Step-1) All three controller up and running Step-2) Shutdown 1st controller Step-3) Shutdown 2nd Controller: Cluster Quorum destroyed Step-4) Bring up 2nd controller:

Question: In step-4 , will pacemaker create the cluster automatically in step-4

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2019-06-30 01:51:01 -0500 asked a question Possibility of multi-site deployment with controllers at one site and with geographically located computes, storage at other sites ?

I am exploring ways to deploy a multi-site OpenStack deployment with controllers at one site and with multiple geographically located compute and storage nodes. For e.g: Site-1: 3 Controllers, some computes and storage Site-2: Compute, Storage Site-3: Compute, Storage ..and so on.
Considering this as a theoretical viable solution, what are some of the areas one should focus to have this up and running?

Best Regards, Purnendu Ghosh

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2016-12-15 13:14:21 -0500 answered a question Using devstack unable to view images in horizon but CLI is ok

I investigated further by comparing the logs with a working installation.

it seems that the following folders/files are not generated in my case: /opt/stack/tacker-horizon/tacker_horizon/locale /opt/stack/tacker-horizon/tacker_horizon/__init__.pyc /opt/stack/tacker-horizon/tacker_horizon/openstack_dashboard/dashboards/nfv/__init__.pyc /opt/stack/tacker-horizon/tacker_horizon/openstack_dashboard/dashboards/nfv/locale

My local.conf reads as follows:

[[local|localrc]] HOST_IP=
























enable_plugin tacker (

enable_plugin networking-sfc git:// stable/newton

enable_service n-novnc

enable_service n-cauth

disable_service tempest

Please let me know if there is anything wrong.

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2016-12-14 12:33:48 -0500 asked a question Using devstack unable to view images in horizon but CLI is ok

After installing devstack ( stable/newton) i ovserve that horizon is not displaying the a) images b) instances Going through the horizon logs i observe the following:

sudo tail -f /var/log/apache2/horizon_error.log | sed 's/\x1b/\o033/g' 2016-12-14 09:22:36.437220 Internal Server Error: /dashboard/i18n/js/horizon+openstack_dashboard+tacker_horizon+tacker_horizon.openstack_dashboard.dashboards.nfv/

2016-12-14 09:22:36.437277 Traceback (most recent call last):

2016-12-14 09:22:36.437282 File "/usr/local/lib/python2.7/dist-packages/django/core/handlers/", line 132, in get_response

2016-12-14 09:22:36.437284 response = wrapped_callback(request, callback_args, *callback_kwargs)

2016-12-14 09:22:36.437287 File "/usr/local/lib/python2.7/dist-packages/django/views/", line 315, in javascript_catalog

2016-12-14 09:22:36.437289 catalog, plural = get_javascript_catalog(locale, domain, packages)

2016-12-14 09:22:36.437291 File "/usr/local/lib/python2.7/dist-packages/django/views/", line 207, in get_javascript_catalog

2016-12-14 09:22:36.437293 path = os.path.join(os.path.dirname(upath(p.__file__)), 'locale')

2016-12-14 09:22:36.437296 AttributeError: 'module' object has no attribute '__file__'

Any idea what could be the reson?