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From "ASF subversion and git services (JIRA)" <>
Subject [jira] [Commented] (CLOUDSTACK-9782) Host HA
Date Wed, 30 Aug 2017 16:07:00 GMT


ASF subversion and git services commented on CLOUDSTACK-9782:

Commit 212e5ccfa7c8fc6d2e334eef6f0474a227f04fb4 in cloudstack's branch refs/heads/master from
[;h=212e5cc ]

CLOUDSTACK-9782: Host HA and KVM HA provider

Host-HA offers investigation, fencing and recovery mechanisms for host that for
any reason are malfunctioning. It uses Activity and Health checks to determine
current host state based on which it may degrade a host or try to recover it. On
failing to recover it, it may try to fence the host.

The core feature is implemented in a hypervisor agnostic way, with two separate
implementations of the driver/provider for Simulator and KVM hypervisors. The
framework also allows for implementation of other hypervisor specific provider
implementation in future.

The Host-HA provider implementation for KVM hypervisor uses the out-of-band
management sub-system to issue IPMI calls to reset (recover) or poweroff (fence)
a host.

The Host-HA provider implementation for Simulator provides a means of testing
and validating the core framework implementation.

Signed-off-by: Abhinandan Prateek <>
Signed-off-by: Rohit Yadav <>

> Host HA
> -------
>                 Key: CLOUDSTACK-9782
>                 URL:
>             Project: CloudStack
>          Issue Type: New Feature
>      Security Level: Public(Anyone can view this level - this is the default.) 
>            Reporter: Rohit Yadav
>            Assignee: Rohit Yadav
>             Fix For: Future,
> CloudStack lacks a way to reliably fence a host, the idea of the host-ha feature is to
provide a general purpose HA framework and implementation specific for hypervisor that can
use additional mechanism such as OOBM (ipmi based power management) to reliably investigate,
recover and fencing a host. This feature can handle scenarios associated with server crash
issues and reliable fencing of hosts and HA of VM.
> FS:

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