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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