Failed to get the dns service IP list

[carryaimp]

kdocker agent app v0.2.0

Failed to get the dns service IP list

Hwo To Reproduce
In the program, the default dns service label is selected as "k8s-app": "kube-dns". In the official definition of core-dns, this label is not available, resulting in an empty IP list corresponding to the acquisition of DNS services, resulting in a subsequent index error on the list:Panic details: runtime error: index out of range [0] with length 0

The default core-dns service name is :kubernetes.io/name: "CoreDNS", official link: https://github.com/coredns/helm/blob/master/charts/coredns/templates/_helpers.tpl

Expected behavior
Correct DNS service IP address list

[ii2day]

@carryaimp Thank you for raising this issue. The kube-dns label does look a bit old. You are welcome to submit a PR to fix this issue.