|Plan Your Installation / Plan Networking Modes|
This topic describes MidoNet components and their Eucalyptus deployment options, which provide support for VPC on Eucalyptus.
Eucalyptus VPCMIDO mode resembles the Amazon Virtual Private Cloud (VPC) product wherein the network is fully configurable by users. In Eucalyptus, it is implemented with a Software-Defined Networking (SDN) technology developed by Midokura, called MidoNet. Midokura Enterprise MidoNet is a network virtualization platform for Infrastructure-as-a-Service (IaaS) clouds that implements and exposes virtual network components as software abstractions, enabling programmatic provisioning of virtual networks.
This network mode requires configuration of MidoNet in order to make cloud networking functional. It offers the most advanced networking capabilities and therefore it is recommended to be used on all new Eucalyptus installations.
A MidoNet deployment consists of four types of nodes (according to their logical functions or services offered), connected via four IP networks as depicted in Figure 1. MidoNet does not require any specific hardware, and can be deployed in commodity x86_64 servers. Interactions with MidoNet are accomplished through Application Programming Interface (API) calls, which are translated into (virtual) network topology changes. Network state information is stored in a logically centralized data store, called the Network State Database (NSDB), which is implemented on top of two open-source distributed coordination and data store technologies: ZooKeeper and Cassandra. Implementation of (virtual) network topology is realized via cooperation and coordination among MidoNet agents, which are deployed in nodes that participate in MidoNet.
Figure 1: Logical view of a MidoNet deployment. Four components are connected via four networks.
Three reference architectures are presented in this document, ordered by complexity and size:
Production: Large reference architecture represents the most complete and recommended deployment model of MidoNet for Eucalyptus. Whenever possible (such as when resources are available), deployments should closely match with the Production: Large reference architecture (even on small scale clouds).
All MidoNet components are designed and implemented to horizontally scale. Therefore, it is possible to start small and add resources as they become available.
Eucalyptus has been tested with Midokura Enterprise MidoNet (commercial version with 24/7 support - 30 day evaluation available).
A Eucalyptus with MidoNet deployment consists of the following components:
Figure 2: Logical view of a Eucalyptus with MidoNet deployment. VM private network is created/virtualized by MidoNet, and 'software-defined' by eucanetd. Ideally, each component and network should have its own set of independent resources. In practice, components are grouped and consolidated into a set of servers, as detailed in different reference architectures.
MidoNet components, Eucalyptus components, and three extra networks are present.
The PoC reference architecture is designed for very small and transient workloads, typical in development and testing environments. Quick deployment with minimal external network requirements are the key points of PoC reference architecture.
Figure 3: PoC deployment topology. A single IP network carries NSDB, Tunnel Zone, and Public Network traffic. A single server handles MidoNet NSDB, API (and possibly Gateway) functionality.
MidoNet Gateway Bindings
Three ways to realize MidoNet Gateway bindings are discussed below, starting with the most recommended setup.
Public CIDR block(s) allocated for Eucalyptus (Euca_Public_IPs) needs to be routed to MidoNet Gateway by the customer network - this is an environment requirement, outside of control of both MidoNet and Eucalyptus systems. One way to accomplish this is to have a BGP terminated link available. MidoNet Gateway will establish a BGP session with the customer router to: (1) advertise Euca_Public_IPs to the customer router; and (2) get the default route from the customer router.
If a BGP terminated link is not available, but the routing of Euca_Public_IPs is delegated to MidoNet Gateway (configuration of customer routing infrastructure), similar setup can be used. In such scenario, static routes are configured on the customer router (to route Euca_Public_IPs to MidoNet Gateway), and on MidoNet (to use the customer router as the default route).
Figure 4: How servers are bound to MidoNet in a PoC deployment with BGP. A BGP terminated link is required: the gateway node eth device is bound to MidoNet virtual router (when BGP is involved, the MidoNet Gateway and Eucalyptus CLC cannot be co-located). Virtual machine tap devices are bound to MidoNet virtual bridges.
If routed Euca_Public_IPs are not available, static routes on all involved nodes (L2 connectivity is required among nodes) can be used as illustrated below.
Figure 5: How servers are bound to MidoNet in a PoC deployment without routed Euca_Public_IPs. Clients that need communication with Euca_Public_IPs configure static routes using MidoNet Gateway as the router. MidoNet Gateway configures a static default route to customer router.
In the case nodes outside the public network broadcast domain (L2) needs to access Euca_Public_IPs, a setup using proxy_arp, as illustrated below, can be used.
Figure 6: How servers are bound to MidoNet in a PoC deployment with proxy_arp. When routed Euca_Public_IPs are not available, the gateway node should proxy arp for public IP addresses allocated for Eucalyptus, and forward to a veth device that is bound to a MidoNet virtual router. Virtual machine tap devices are bound to MidoNet virtual bridges.
The Production: Small reference architecture is designed for small scale production quality deployments. It supports MidoNet NSDB fault tolerance (partial failures), and limited MidoNet Gateway failover and load balancing/sharing.
Border Gateway Protocol (BGP) terminated uplinks are recommended for production quality deployments.
Figure 7: Production:Small deployment topology. A 10Gbps IP network carries NSDB and Tunnel Zone traffic. Another 10Gbps IP network carries Public Network traffic. A 3-node cluster for NSDB tolerates 1 server failure, and 2 gateways enable network failover and limited load balancing/sharing.
Figure 8: How servers are bound to MidoNet in a Production:Small deployment. Gateway Nodes have physical devices bound to a MidoNet virtual router. These devices should have L2 and L3 connectivity to the Customer's Router, and with BGP terminated links. Virtual machine tap devices are bound to MidoNet virtual bridges.
NSDB Data Replication
MidoNet Gateway Failover
MidoNet Gateway Load Balancing and Sharing
The Production:Large reference architecture is designed for large scale (500 to 600 MidoNet agents) production quality deployments. It supports MidoNet NSDB fault tolerance (partial failures), and MidoNet Gateway failover and load balancing/sharing.
Border Gateway Protocol (BGP) terminated uplinks are required. Each uplink should come from an independent router.
Figure 9: Production:Large deployment topology. A 1Gbps IP network carries NSDB; a 10Gbps IP network carries Tunnel Zone traffic; and another 10Gbps IP network carries Public Network traffic. A 5-node cluster for NSDB tolerates 2 server failures, and 3 gateways enable network failover and load balancing/sharing. Servers are bound to MidoNet in a way similar to Production:Small.
NSDB Data Replication
MidoNet Gateway Failover
MidoNet Gateway Load Balancing/Sharing