apiVersion: flows.netobserv.io/v1beta2
kind: FlowCollector
metadata:
name: cluster
spec:
namespace: netobserv
deploymentModel: Direct
agent:
type: eBPF
ebpf:
privileged: true (1)
You can configure the Network Observability Operator to collect and enrich network flow data from secondary networks, such as SR-IOV and OVN-Kubernetes.
Access to an OKD cluster with an additional network interface, such as a secondary interface or an L2 network.
In order to collect traffic from a cluster with a Single Root I/O Virtualization (SR-IOV) device, you must set the FlowCollector
spec.agent.ebpf.privileged
field to true
. Then, the eBPF agent monitors other network namespaces in addition to the host network namespaces, which are monitored by default. When a pod with a virtual functions (VF) interface is created, a new network namespace is created. With SRIOVNetwork
policy IPAM
configurations specified, the VF interface is migrated from the host network namespace to the pod network namespace.
Access to an OKD cluster with a SR-IOV device.
The SRIOVNetwork
custom resource (CR) spec.ipam
configuration must be set with an IP address from the range that the interface lists or from other plugins.
In the web console, navigate to Operators → Installed Operators.
Under the Provided APIs heading for the NetObserv Operator, select Flow Collector.
Select cluster and then select the YAML tab.
Configure the FlowCollector
custom resource. A sample configuration is as follows:
FlowCollector
for SR-IOV monitoringapiVersion: flows.netobserv.io/v1beta2
kind: FlowCollector
metadata:
name: cluster
spec:
namespace: netobserv
deploymentModel: Direct
agent:
type: eBPF
ebpf:
privileged: true (1)
1 | The spec.agent.ebpf.privileged field value must be set to true to enable SR-IOV monitoring. |
*Creating an additional SR-IOV network attachment with the CNI VRF plugin.
You can observe network traffic on an OpenShift Virtualization setup by identifying eBPF-enriched network flows coming from VMs that are connected to secondary networks, such as through OVN-Kubernetes. Network flows coming from VMs that are connected to the default internal pod network are automatically captured by Network Observability.
Get information about the virtual machine launcher pod by running the following command. This information is used in Step 5:
$ oc get pod virt-launcher-<vm_name>-<suffix> -n <namespace> -o yaml
apiVersion: v1
kind: Pod
metadata:
annotations:
k8s.v1.cni.cncf.io/network-status: |-
[{
"name": "ovn-kubernetes",
"interface": "eth0",
"ips": [
"10.129.2.39"
],
"mac": "0a:58:0a:81:02:27",
"default": true,
"dns": {}
},
{
"name": "my-vms/l2-network", (1)
"interface": "podc0f69e19ba2", (2)
"ips": [ (3)
"10.10.10.15"
],
"mac": "02:fb:f8:00:00:12", (4)
"dns": {}
}]
name: virt-launcher-fedora-aqua-fowl-13-zr2x9
namespace: my-vms
spec:
# ...
status:
# ...
1 | The name of the secondary network. |
2 | The network interface name of the secondary network. |
3 | The list of IPs used by the secondary network. |
4 | The MAC address used for secondary network. |
In the web console, navigate to Operators → Installed Operators.
Under the Provided APIs heading for the NetObserv Operator, select Flow Collector.
Select cluster and then select the YAML tab.
Configure FlowCollector
based on the information you found from the additional network investigation:
apiVersion: flows.netobserv.io/v1beta2
kind: FlowCollector
metadata:
name: cluster
spec:
# ...
ebpf:
privileged: true (1)
processor:
advanced:
secondaryNetworks:
- index: (2)
- MAC (3)
name: my-vms/l2-network (4)
# ...
1 | Ensure that the eBPF agent is in privileged mode so that flows are collected for secondary interfaces. |
2 | Define the fields to use for indexing the virtual machine launcher pods. It is recommended to use the MAC address as the indexing field to get network flows enrichment for secondary interfaces. If you have overlapping MAC address between pods, then additional indexing fields, such as IP and Interface , could be added to have accurate enrichment. |
3 | If your additional network information has a MAC address, add MAC to the field list. |
4 | Specify the name of the network found in the k8s.v1.cni.cncf.io/network-status annotation. Usually <namespace>/<network_attachement_definition_name>. |
Observe VM traffic:
Navigate to the Network Traffic page.
Filter by Source IP using your virtual machine IP found in k8s.v1.cni.cncf.io/network-status
annotation.
View both Source and Destination fields, which should be enriched, and identify the VM launcher pods and the VM instance as owners.