Murano have advanced networking features that give you ability to not care
about configuring networks for your application. By default it will create
an isolated network for each environment and join all VMs needed by your
application to that network.

Previously, created network was joined to the first found router in the
tenant and this behaviour is wrong in many ways. At least some tenants may
have more than one router, and this may cause issues when Murano attaching
network to the wrong router.

We reworked this feature a little bit
(https://review.openstack.org/119800). Now
you can choose which router should be used by Murano to attach created
networks. By default router should be named as "*murano-default-router*".
You can change name of the router that will be used in configuration file,
in the [*networking]  *section:
[networking]
...

# Name of the router that going to be used in order to join
# all networks created by Murano (string value)
router_name=router04

Warning! This means, that if you will upgrade Murano to the *juno-rc1* without
additional configuration your deployment will stop working failing with
following error message: *KeyError: Router murano-default-router was not
found*

Requiring cloud providers to have configured router for each tenant is a
burden on DevOps teams, therefore we improved (
https://review.openstack.org/121679) this feature a little bit more and
added ability to create router with specified name if it is not present in
the tenant. This behaviour may be switched on/off via configuration file,
and you can also specify which external network should be used to attach
router to:
[networking]
...
# ID or name of the external network for routers to connect to
# (string value)
#external_network=ext-net
...
# This option will create a router when one with "router_name"
# does not exist (boolean value)
#create_router=true

-- 
Serg Melikyan
http://mirantis.com | smelik...@mirantis.com
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