Description of problem:

kube-apiserver.service does not start any more in Fedora 26 (still works fine in 25, CentOS 7, etc.):

E0411 12:36:28.827991     486 server.go:254] Failed to create clientset: parse 127.0.0.1:8080: first path segment in URL cannot contain 
colon

This was apparently reported as https://github.com/kubernetes/kubernetes/issues/38380 and fixed later on, but it seems the fix is still missing in Fedora 26.


Version-Release number of selected component (if applicable):

kubernetes-master-1.5.4-2.fc26.x86_64

How reproducible: Always


Steps to Reproduce:

I noticed that when investigating the Cockpit test regressions on Fedora 26 [1].
 I reproduced the steps in a clean system. I used a privileged LXC container:

 sudo lxc-create -n f26 -t fedora -- --release 26
 echo 'lxc.cap.drop =' | sudo tee -a /var/lib/lxc/f26/config
 sudo lxc-start -n f26
 sudo lxc-attach -n f26

but this isn't specific to containers (the cockpit tests run in full QEMU VMs).

But I do use cockpit's kubernetes setup script to configure the kube master. This needed an initial fix to work with kube-apiserver.service now running as user, thus I need to use the script from the Pull Request:

  dnf install -y etcd openssl kubernetes kubernetes-master

  curl https://raw.githubusercontent.com/mvollmer/cockpit/fedora-26/test/images/scripts/lib/kubernetes.setup | sh -ex

  systemctl start etcd kube-apiserver kube-controller-manager kube-scheduler kube-proxy kubelet

After that, kube-apiserver.service fails with the above error. These steps work fine in previous Fedoras.

[1] https://github.com/cockpit-project/cockpit/pull/6294