The OVS Plugin¶
Introduction to the OVS Plugin¶
The OVS plugin is the native SDN implementations in CloudStack, using GRE isolation method. The plugin can be used by CloudStack to implement isolated guest networks and to provide additional services like NAT, port forwarding and load balancing.
Features of the OVS Plugin¶
The following table lists the CloudStack network services provided by the OVS Plugin.
|Network Service||CloudStack version|
|Virtual Networking||>= 4.0|
|Static NAT||>= 4.3|
|Port Forwarding||>= 4.3|
|Load Balancing||>= 4.3|
Table: Supported Services
The Virtual Networking service was originally called ‘Connectivity’ in CloudStack 4.0
The following hypervisors are supported by the OVS Plugin.
Table: Supported Hypervisors
Configuring the OVS Plugin¶
Before enabling the OVS plugin the hypervisor needs to be install OpenvSwitch. Default, XenServer has already installed OpenvSwitch. However, you must install OpenvSwitch manually on KVM. CentOS 6.4 and OpenvSwitch 1.10 are recommended.
- CentOS 6.4 is recommended.
- To make sure that the native bridge module will not interfere with openvSwitch the bridge module should be added to the blacklist. See the modprobe documentation for your distribution on where to find the blacklist. Make sure the module is not loaded either by rebooting or executing rmmod bridge before executing next steps.
CloudStack needs to have at least one physical network with the isolation method set to “GRE”. This network should be enabled for the Guest traffic type.
With KVM, the traffic type should be configured with the traffic label that matches the name of the Integration Bridge on the hypervisor. For example, you should set the traffic label as following:
- Management & Storage traffic: cloudbr0
- Guest & Public traffic: cloudbr1 See KVM networking configuration guide for more detail.
Only for KVM hypervisor
Configure network interfaces:
/etc/sysconfig/network-scripts/ifcfg-eth0 DEVICE=eth0 BOOTPROTO=none IPV6INIT=no NM_CONTROLLED=no ONBOOT=yes TYPE=OVSPort DEVICETYPE=ovs OVS_BRIDGE=cloudbr0 /etc/sysconfig/network-scripts/ifcfg-eth1 DEVICE=eth1 BOOTPROTO=none IPV6INIT=no NM_CONTROLLED=no ONBOOT=yes TYPE=OVSPort DEVICETYPE=ovs OVS_BRIDGE=cloudbr1 /etc/sysconfig/network-scripts/ifcfg-cloudbr0 DEVICE=cloudbr0 ONBOOT=yes DEVICETYPE=ovs TYPE=OVSBridge BOOTPROTO=static IPADDR=172.16.10.10 GATEWAY=172.16.10.1 NETMASK=255.255.255.0 HOTPLUG=no /etc/sysconfig/network-scripts/ifcfg-cloudbr1 DEVICE=cloudbr1 ONBOOT=yes DEVICETYPE=ovs TYPE=OVSBridge BOOTPROTO=none HOTPLUG=no /etc/sysconfig/network NETWORKING=yes HOSTNAME=testkvm1 GATEWAY=126.96.36.199
Enabling the service provider¶
The OVS provider is disabled by default. Navigate to the “Network Service Providers” configuration of the physical network with the GRE isolation type. Navigate to the OVS provider and press the “Enable Provider” button.
Using the OVS plugin requires a network offering with Virtual Networking enabled and configured to use the OVS element. Typical use cases combine services from the Virtual Router appliance and the OVS plugin.
Table: Isolated network offering with regular services from the Virtual Router.
The tag in the network offering should be set to the name of the physical network with the OVS provider.
Isolated network with network services. The virtual router is still required to provide network services like dns and dhcp.
Table: Isolated network offering with network services
Using the OVS plugin with VPC¶
OVS plugin does not work with VPC at that time