IPVS Elector

Implementing an ARP sysctl handler in Kubernetes, if the node leading, it will be sending replies in response to received ARP requests that resolve local target IP addresses. The IPVS Elector also implements a failover mechanism so that a different node can take over should the current leader node fail for some reason.

Building from Source

Clone repo into your go path under $GOPATH/src:

$ git clone https://github.com/inwinstack/ipvs-elector.git $GOPATH/src/github.com/inwinstack/ipvs-elector
$ cd $GOPATH/src/github.com/inwinstack/ipvs-elector
$ dep ensure
$ make

Running

To see the app in action, run the following three commands in separate terminals:

# terminal 1
$ POD_NAME=test-1 POD_NAMESPACE=default go run cmd/main.go --kubeconfig $HOME/.kube/config --logtostderr -v=2

# terminal 2
$ POD_NAME=test-2 POD_NAMESPACE=default go run cmd/main.go --kubeconfig $HOME/.kube/config --logtostderr -v=2

# terminal 3
$ POD_NAME=test-3 POD_NAMESPACE=default go run cmd/main.go --kubeconfig $HOME/.kube/config --logtostderr -v=2

Now kill a terminal to see the changes.

Deploying elector into Kubernetes cluster

Run the following command to deploy the IPVS Elector:

$ kubectl apply -f deploy/
$ kubectl -n kube-system get po -l k8s-app=ipvs-elector -o wide