PREIN

/bin/sh

getent group kube >/dev/null || groupadd -r kube
getent passwd kube >/dev/null || useradd -r -g kube -d / -s /sbin/nologin \
        -c "Kubernetes user" kube

PREUN

/bin/sh

 
if [ $1 -eq 0 ] && [ -x "/usr/lib/systemd/systemd-update-helper" ]; then 
    # Package removal, not upgrade 
    /usr/lib/systemd/systemd-update-helper remove-system-units kube-apiserver kube-scheduler kube-controller-manager || : 
fi

POSTIN

/bin/sh

 
if [ $1 -eq 1 ] && [ -x "/usr/lib/systemd/systemd-update-helper" ]; then 
    # Initial installation 
    /usr/lib/systemd/systemd-update-helper install-system-units kube-apiserver kube-scheduler kube-controller-manager || : 
fi

POSTUN

/bin/sh

 
if [ $1 -ge 1 ] && [ -x "/usr/lib/systemd/systemd-update-helper" ]; then 
    # Package upgrade, not uninstall 
    /usr/lib/systemd/systemd-update-helper mark-restart-system-units kube-apiserver kube-scheduler kube-controller-manager || : 
fi