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Description of problem:

kube-apiserver fails to create /var/run/kubernetes on startup.

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

# rpm -qa | grep kube
kubernetes-0.9.0-0.3.git96af0c3.el7.x86_64

How reproducible:

# systemctl start kube-apiserver.service

The service becomes online on serface, but it shows the following errors on log file.

Mar 14 12:31:54 kubemaster01 kube-apiserver[1126]: E0314 12:31:54.338817    1126 apiserver.go:269] Unable to listen for secure (open /var/run/kubernetes/apiserver.crt: no such file or directory); will try again.
Mar 14 12:32:09 kubemaster01 kube-apiserver[1126]: E0314 12:32:09.339238    1126 apiserver.go:269] Unable to listen for secure (open /var/run/kubernetes/apiserver.crt: no such file or directory); will try again.


Additional info:

This is probably because kube-apiserver runs as user kube and it doesn't have a write permission on /var/run.

As a workaround, I created the drop-in systemd config and it worked well.

# cat /etc/systemd/system/kube-apiserver.service.d/pre-start.conf 
[Service]
PermissionsStartOnly=yes
ExecStartPre=/usr/bin/mkdir -p /var/run/kubernetes
ExecStartPre=/usr/bin/chown kube.kube /var/run/kubernetes

Fix in Fedora:
https://bugzilla.redhat.com/show_bug.cgi?id=1200969