[ubuntu-cloud] A Basic Eucalyptus Network

[Neil Soman]

> Thanks for the reply Neil,
>
> So if I install the cloud and cluster controllers on the same computer,
> that server will act as a proxy for http traffic? In other  words, I can
> pretend like the controller is just one big computer? I don't believe
> this is mentioned in the documentation.

I'm not sure I understand you correctly. Http traffic to/from VMs? No,
the front end does not control that. Your VMs will appear as "regular"
hosts. It is upto the application developer to decide what to do what
their collection of VMs.

> On an aside, say my existing web app saves files to the filesystem. Will
> it be necessary to configure Walrus/s3fs for the directories the web app
> uses? If an application does create a new file on one of the VMs (silly
> devs), what behavior will happen? Will the file persist on that
> particular VM but not on other ones? If that VM restarts, will it lose
> the file?
>

You could use s3fs to save user data to Walrus if you need a
filesystem interface. Note, though, that the namespace is flat and it
won't perform like a "normal" filesystem. If you want data to persist
across VM lifecycles, you are better off creating an block storage
volume (like EBS) and attaching that to your VM and creating a
filesystem on it.

hope that helps.
neil