Feat: a more simple way to expose LoadBalancer Service by OpenELB

[KONY128]

I created a new mode to easily expose LoadBalancer Service by OpenELB.

For detailed information, plz read this proposal: #214

[FeynmanZhou]

/cc @zheng1

[zheng1]

How about adding a protocol called node-proxy? Use the annotation protocol.porter.kubesphere.io/v1alpha1: node-proxy to enable this mode.

In this case, the code here could be redefined with the following changes

Suggested change

	PorterLBSAnnotationKey string = "lbs.porter.kubesphere.io/v1alpha1"
	PorterOnePort string = "one"
	PorterAllNode string = "all"
	PorterNodeExtnlIPPrefLabel string = "lbs.porter.kubesphere.io/external-ip-preffered"
	PorterNodeExcludeLBSLabel string = "lbs.porter.kubesphere.io/exclude.node"
	PorterLBSExposedExternalIP string = "lbs.porter.kubesphere.io/exposed.node.external-ips"
	PorterLBSExposedInternalIP string = "lbs.porter.kubesphere.io/exposed.node.internal-ips"
	PorterForwardImage string = "kubespheredev/openelb-forward:v0.4.2"
	PorterProxyImage string = "kubespheredev/openelb-proxy:v0.4.2"
	NameSeparator string = "-"
	IPSeparator string = ","
	EnvArgSplitter string = " "
	PorterDeDsPrefix string = "svc-proxy-"
	PorterLBSFInalizer string = "lbs.porter.kubesphere.io/finalizer"
	NodeProxyTypeAnnotationKey string = "node-proxy.porter.kubesphere.io/type"
	NodeProxyTypeDeployment string = "deployment"
	NodeProxyTypeDaemonSet string = "daemonset"
	LabelNodeProxyExternalIPPreffered string = "node-proxy.porter.kubesphere.io/external-ip-preffered"
	LabelNodeProxyExcludeNode string = "node-proxy.porter.kubesphere.io/exclude-node"
	NodeProxyExternalIPAnnotationKey string = "node-proxy.porter.kubesphere.io/external-ip"
	NodeProxyInternalIPAnnotationKey string = "node-proxy.porter.kubesphere.io/internal-ip"
	NodeProxyForwardImage string = "kubespheredev/openelb-forward:v0.4.2"
	NodeProxyProxyImage string = "kubespheredev/openelb-proxy:v0.4.2"
	NameSeparator string = "-"
	IPSeparator string = ","
	EnvArgSplitter string = " "
	NodeProxyWorkloadPrefix string = "node-proxy-"
	NodeProxyFinalizerName string = "node-proxy.porter.kubesphere.io/finalizer"

[zheng1]

Thank you ever so much for this contribution.

For the definition of using methods and annotations, I submitted a code comment, please take a look. I have no other problems with the other code changes.

Can you make the following change in the next PR: pass NodeProxyForwardImage and NodeProxyProxyImage as env, and define these two values via configmap when deploying the porter, so that it is easy for other users to define custom images.

[FeynmanZhou]

Thank you ever so much for this contribution.

For the definition of using methods and annotations, I submitted a code comment, please take a look. I have no other problems with the other code changes.

Can you make the following change in the next PR: pass NodeProxyForwardImage and NodeProxyProxyImage as env, and define these two values via configmap when deploying the porter, so that it is easy for other users to define custom images.

@KONY128 Just circling back, how's this PR going?

[zheng1]

/approve
/lgtm

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