On 07/14/2016 07:12 AM, Vladislav Belogrudov wrote:
Hello,
is it possible to run dvr_snat on computes only (in ha mode as well)? Docs [1]
tell that dvr_snat+l3_ha agents should be on controllers / network nodes while
dvr agents on computes. Does dvr part of dvr_snat only work in active/passive if
we do ha?
I wonder if compute nodes can be network ones as well without much overhead.
This way network nodes would go away from the setup.
SNAT is always a centralized component of Neutron, since there is a single
default SNAT IP address that must be shared by all VMs for a tenant - that IP
can't be in two places at once. Running in dvr_snat mode on computes will just
make them all network nodes, which should be avoided since losing a compute then
means you've lost more of your control plane. They are typically separate due
to the differences in how they are managed - network nodes are more like pets,
computes more like cattle.
-Brian
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