Hello everyone,
Im new to Openstack's world, i would like to measure the instantiation time of a VM(i.e the time from "launch" until a vm to be active).
Does openstack provide this somehow?
Thank you in advance.
There are several ways to do this. Let me explain this in detail
Also, keep in mind that there is a difference between the uptime and time since the server was created. The original uptime cannot be found using the os-simple-tenant-usage API. It will only return the time since the server was created in the field named uptime
I hope this helps !!
I don't think that Ceilometer measures the time between launch and activation. os-simple-tenant just summarizes resource usage, but not the data the OP wants. I am not aware of any metadata that triggers calculation of the time between launch and becoming active.
Stacktach looks interesting.
I learned about it an hour ago. All I can do is read its documentation.
@p4pe I am sorry. I misread your question. I thought you needed to get the uptime for a VM. I answered this keeping the uptime in mind. I agree with @Bernd Bausch and I went through your question again. You can try stacktach OR you can hook into rabbitmq to see and extract VM related events
Asked: 2019-10-08 04:02:52 -0600
Seen: 70 times
Last updated: Oct 08
As far as I know, this is not measured. You could, however, use the nova-api log file. Find out the request ID for the launch request and look at the time stamps of relevant log entries.
It might be easier to just add time measurement to the code.
Thank you for your answer. Do you know which script in nova module should i change? because the git is a little bit chaotic.
Sorry, no. I would have to search for it, probably by finding where the route for the server-create API is defined, then by grepping for code lines that set the status to ACTIVE.
Searching at the nova-compute logs in the compute node.. I realize that logs provide information about the spawning time in the hypervisor(6.6 sec) and after this the time to build the instance (7.34sec for my instance). Do you think that this is the value that i want?