On Thu, Dec 18, 2014 at 10:57:52PM +0530, Girija Sharan wrote: > " curl http://169.254.169.254/openstak/latest/meta_data.json " from inside > the VM (once it is launched), I am getting hostname, name, availability > zone, etc etc. as output. > ----> So here my question becomes : How this meta_data.json file is getting > created and updated with these details. Details like Name, Availabitily > zone, flavor, etc I am specifying while launching VM. But no where I am > mentioning *hostname*. How in meta_data.json file 'hostname' field is > getting updated/added.
These are set to the name you give your instance when it
boots. The domain name (".novalocal") is configured in, e.g.,
nova.conf.
> Here, as you have mentioned, my question becomes : How does
> redhat/ubuntu/centos/etc set the hostname if has not been explicitly
> configured by the administrator?
I think I answered this for RedHat and derivatives; I'm not familiar
with how Ubuntu handles this.
> Also, In addition to above query, how does redhat/ubuntu/centos/etc set the
> hostname
> if has not been explicitly configured by the administrator and the VM
> launched didn't get the IP?
I think RedHat may simply default to "localhost.localdomain" if the
system does not have a configured hostname and is not able to reach
DNS, but I'm not sure.
I have no idea how Ubuntu behaves.
--
Lars Kellogg-Stedman <[email protected]> | larsks @ {freenode,twitter,github}
Cloud Engineering / OpenStack | http://blog.oddbit.com/
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