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How can we overcome any type of sudden server failure?

asked 2020-03-28 00:14:52 -0500

Devendra_Singh_Balihar gravatar image

During the failure of the server or when the server is not seen to be perfectly functioning, How can we manage this.

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Do you mean a Nova instance, a compute node or a controller?

Generally the answer is redundancy - several servers.

Bernd Bausch gravatar imageBernd Bausch ( 2020-03-28 02:32:20 -0500 )edit

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answered 2020-03-29 14:58:27 -0500

dalem gravatar image

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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There is no such default as three servers in ceph. You can configure it any way you want, even a one-node-ceph-cluster ist no problem. But the idea is correct, ceph is designed as a redundant storage system for several different applications, one of them is OpenStack.

eblock gravatar imageeblock ( 2020-03-30 05:03:10 -0500 )edit

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Asked: 2020-03-28 00:14:52 -0500

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Last updated: Mar 29 '20