Re: [openstack-dev] [heat][nova] VM restarting on host, failure in convergence

2014-09-19 Thread Jastrzebski, Michal
All, Currently OpenStack does not have a built-in HA mechanism for tenant instances which could restore virtual machines in case of a host failure. Openstack assumes every app is designed for failure and can handle instance failure and will self-remediate, but that is rarely

Re: [openstack-dev] [heat][nova] VM restarting on host failure in convergence

2014-09-19 Thread Jastrzebski, Michal
In short, what we'll need from nova is to have 100% reliable host-health monitor and equally reliable rebuild/evacuate mechanism with fencing and scheduler. In heat we need scallable and reliable event listener and engine to decide which action to perform in given situation.

[openstack-dev] [heat][nova] VM restarting on host failure in convergence

2014-09-17 Thread Jastrzebski, Michal
All, Currently OpenStack does not have a built-in HA mechanism for tenant instances which could restore virtual machines in case of a host failure. Openstack assumes every app is designed for failure and can handle instance failure and will self-remediate, but that is rarely the case for the very

Re: [openstack-dev] [heat][nova] VM restarting on host failure in convergence

2014-09-17 Thread Russell Bryant
On 09/17/2014 09:03 AM, Jastrzebski, Michal wrote: In short, what we'll need from nova is to have 100% reliable host-health monitor and equally reliable rebuild/evacuate mechanism with fencing and scheduler. In heat we need scallable and reliable event listener and engine to decide which

Re: [openstack-dev] [heat][nova] VM restarting on host failure in convergence

2014-09-17 Thread Clint Byrum
Excerpts from Jastrzebski, Michal's message of 2014-09-17 06:03:06 -0700: All, Currently OpenStack does not have a built-in HA mechanism for tenant instances which could restore virtual machines in case of a host failure. Openstack assumes every app is designed for failure and can handle