I'm trying to bring docker container to kubernetes. In docker you can ask the dns for :
host tasks.containername The result are all internal IPs from running containers with this name.
I do the same on kubernetes, by using the headless-services. I can do
host pod-name The result are also all internal IPs from the pods.
So far so good but there are a lot of "run.sh" scripts that uses the "task.XXX" query. Have someone a idea how to fix this without editing all run.sh scripts ?
Maybe something in the coredns, with mapping.
best and thank you
I think editing them is the wisest solution.
For sake of clarity, it's not host pod-name but host headless-service
I agree with editing the scripts is the wisest solution, but here is how you can edit coredns in kubernetes.
kubectl edit configmap coredns -n kube-system
and then add the rewrite config as below.
rewrite name tasks.containername.default.svc.cluster.local containername.default.svc.cluster.localfor example
.:53 {
errors
log
health
rewrite name tasks.containername.default.svc.cluster.local containername.default.svc.cluster.local
kubernetes cluster.local 10.0.0.0/24
proxy . /etc/resolv.conf
cache 30
}
And then reload coredns as below
kubectl exec -n kube-system coredns-xxxxxxx -- kill -SIGUSR1 1