It seems to me there are two major approaches to the Octavia VM design: 1. Start with a standard Linux distribution (e.g. Ubuntu 14.04 LTS) and install HAProxy 1.5 and Octavia control layer 2. Develop a minimal purpose driven distribution (similar to m0n0wall) with just HAProxy, iproute2 and a Python runtime for the control layer.
The primary difference here is additional development effort for option 2, verses the increased image size of option 1. Using Ubuntu and CirrOS images a representative of the two options it looks like the image size difference is on the about 20 times larger for a full featured distribution. If one of the HA models is to spin up a replacement instance on failure the image size could be significantly affect fail-over time. For initial work I think starting with a standard distribution would be sensible, but we should target systemd (Debian adopted systemd as new default, and Ubuntu is following suit). I wanted to find out if there is interest in a minimal Octavia image, and if so this may affect design decisions on the instance control plane component. -Dustin
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