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What does the launched_at column mean?

asked 2013-09-12 13:11:33 -0500

PaulW gravatar image

updated 2013-09-12 15:02:32 -0500

sgordon gravatar image

In the nova instances sql table, what does the launched_at column mean? Does it denote that the VM is "active"? Or is it simply in "building" state?

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answered 2015-08-14 12:28:17 -0500

PaulW gravatar image

And actually, based on comparing scores of launched_at times and the corresponding console logs for these instances, it looks like the launched_at time is almost always just before the boot process begins on the VM instance. So I think of this now as the VM instance informing the nova controller, "hey, I'm now booting up". It doesn't mean, of course, that the VM has acquired an IP address or key-pair, or that the boot will even be successful. That is, the term "active" doesn't mean the VM can now accept SSH sessions.

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answered 2013-09-12 15:01:52 -0500

sgordon gravatar image

updated 2013-09-12 15:02:05 -0500

The launched_at value denotes the time that the given instance was last launched by a Hypervisor [1]. It indicates that the instance last became active, at the given time.

[1] https://wiki.openstack.org/wiki/SystemUsageData#Event_Types_and_Payload_data :

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Asked: 2013-09-12 13:11:33 -0500

Seen: 208 times

Last updated: Aug 14 '15