Network traffic isolation with MAAS
MicroStack, in MAAS mode, supports network traffic isolation in a multi-network environment, where each of these cloud networks is coupled with specific cloud activity. It does this through the integration of Juju network spaces.
Traffic isolation is implemented at the discretion of the cloud architect, where the degree of isolation is dependent upon the number of subnets used. That is, no isolation results from using a sole subnet with a single space. Conversely, maximum isolation can be arrived at with unique subnet-space pairings. The subnet:space mappings are done within MAAS.
To finish, spaces are mapped to the cloud network names supported by MicroStack. The space:network mappings are done at the MicroStack level. In the case of an environment consisting of a sole subnet, each cloud network will be mapped to the same space.
Note: The Multi-node with MAAS page shows how to use MicroStack with MAAS.
Cloud networks
The cloud network names supported by MicroStack, their corresponding traffic types, and examples of such traffic is given here:
| Cloud network | Traffic type | Example traffic |
|---|---|---|
| data | hypervisor-to-hypervisor (East-West) | intra-Project routing by OVN/OVS |
| internal | control plane | Nova to RabbitMQ queries |
| management | cloud node management | Juju |
| public | service API endpoints | Identity service via Keystone |
| storage | instance-to-storage | Ceph-based volumes |
| storage-cluster | storage-to-storage | Ceph data rebalancing |
There are other types of traffic that don’t necessarily map to the above cloud networks. They are described below:
| Other networking | Traffic type | Example traffic |
|---|---|---|
| “external networking” | instance-to-external (North-South) | instance remote access over SSH |
| “private networking” | instance-to-openstack | OpenStack internal |
Machine access
Machines in the cloud environment require access to certain cloud networks.
Node roles
Machines identified by their MicroStack node roles, and their associated services, must have access to specific cloud networks. These access requirements are described here:
| Node role | Hosted service | Cloud network access |
|---|---|---|
| juju-controller | Juju controller and clusterd database |
management |
| control | cloud control plane services | management, internal, public, storage |
| compute | Nova Compute (hypervisors) | management, internal, data, storage |
| storage | Ceph | management, storage, storage-cluster |
Client
The client machine will need access to the management and public cloud networks.
It will also need access to the cloud’s external networking in order to access cloud instances (e.g. over SSH).