Add nodeSelector for FlowAggregator and ELK Pods

[antoninbas]

When using the FlowAggregator or the ELK reference stack on a cluster
with ARM and Windows Nodes, Pods should be scheduled on Linux AMD64
Nodes.

For the FlowAggregator, we may consider providing a multi-arch Docker
manifest with support for ARM achitectures, like we do for the the
Antrea image.

[codecov-io]

Codecov Report

Merging #2087 (57cc3e8) into main (b118f2d) will decrease coverage by 0.09%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #2087      +/-   ##
==========================================
- Coverage   60.97%   60.88%   -0.10%     
==========================================
  Files         270      270              
  Lines       20366    20366              
==========================================
- Hits        12418    12399      -19     
- Misses       6649     6672      +23     
+ Partials     1299     1295       -4     

Flag	Coverage Δ
kind-e2e-tests	51.54% <ø> (-0.10%)	⬇️
unit-tests	41.35% <ø> (-0.02%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
pkg/agent/openflow/pipeline.go	67.70% <0.00%> (-2.16%)	⬇️
pkg/agent/openflow/client.go	59.04% <0.00%> (-0.80%)	⬇️
pkg/agent/agent.go	47.48% <0.00%> (+0.47%)	⬆️
pkg/agent/route/route_linux.go	42.44% <0.00%> (+0.58%)	⬆️
...ntroller/networkpolicy/networkpolicy_controller.go	71.10% <0.00%> (+0.97%)	⬆️
pkg/apiserver/storage/ram/watch.go	94.23% <0.00%> (+3.84%)	⬆️

[srikartati]

Yes, multi-arch flow aggregator manifest sounds good. We should open an issue.

[srikartati]

Yes, multi-arch flow aggregator manifest sounds good. We should open an issue.

In addition, for the flow aggregator, I think there is no tight requirement for the node to have Linux OS and it should be able to run on windows nodes if we can put together a proper image. Not very familiar with Windows deployments. Do you agree?

[dreamtalen]

LGTM

[antoninbas]

/test-all

[antoninbas]

/test-e2e

[antoninbas]

/test-e2e

[antoninbas]

In addition, for the flow aggregator, I think there is no tight requirement for the node to have Linux OS and it should be able to run on windows nodes if we can put together a proper image. Not very familiar with Windows deployments. Do you agree?

Yes, we could in theory but I don't think there is an advantage in doing so at the moment. Windows clusters will typically have Linux Nodes as well.

[srikartati]

Yes, we could in theory but I don't think there is an advantage in doing so at the moment. Windows clusters will typically have Linux Nodes as well.

Yup, I read that one of the requirements for Kubernetes clusters with Windows nodes is to have control plane node on Linux.