hostPort not available when using kube-flannel.yml

[osoriano]

I deployed the registry cluster add-on which relies on hostPorts and couldn't connect to the hostPort.

Expected Behavior

The hostPort in the container spec should be available.

Current Behavior

The port is not available.

Possible Solution

Enable the portmap plugin in the CNI conf. This is how bootkube solved it: kubernetes-retired/bootkube#697

Also, the flannel-cni repo was updated to include the portmap plugin in the CNI config:
coreos/flannel-cni#5

The CNI portmap capability was added in k8s 1.7

Steps to Reproduce (for bugs)

1. Deploy flannel using kube-flannel.yaml
2. Create a pod that uses a hostPort

Context

Others have reported the issue, but the kube-flannel.yml was not updated

Your Environment

• Flannel version: v0.9.1-amd64
• Backend used (e.g. vxlan or udp): vxlan
• Etcd version: v3.2.9
• Kubernetes version (if used): 1.8.3
• Operating System and version: CentOS7