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Are VM ids unique

asked 2017-02-14 13:27:29 -0500

anonymous user


Will the VM ids be always unique ? Would they be ever re-used ?

1) If I have terminated a VM and bring up a new VM, can the new VM get an Id which was used by an earlier VM which is now terminated ?

2) Will the Ids be unique across tenants & regions ?

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answered 2017-02-14 19:18:43 -0500

Wikipedia says "While the probability that a UUID will be duplicated is not zero, it is so close to zero as to be negligible". Instance IDs, and IDs of most other objects in an OpenStack cloud, are UUIDs, so you can consider them unique across tenants, regions, and time, and perhaps even across clouds.

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Thanks for your response, that answers my question.

SharadR gravatar imageSharadR ( 2017-02-14 23:47:07 -0500 )edit

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Asked: 2017-02-14 13:27:29 -0500

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Last updated: Feb 14 '17