kubespray/roles/kubernetes/node/templates/kubelet.rkt.service.j2

[Unit]
Description=Kubernetes Kubelet Server
Documentation=https://github.com/GoogleCloudPlatform/kubernetes
Wants=network.target

[Service]
User=root
Restart=on-failure
RestartSec=10s
TimeoutStartSec=0
LimitNOFILE=40000

ExecStartPre=-/usr/bin/rkt rm --uuid-file=/var/run/kubelet.uuid
ExecStartPre=-/bin/mkdir -p /var/lib/kubelet
ExecStartPre=-/bin/mkdir -p {{ kubelet_flexvolumes_plugins_dir }}

EnvironmentFile={{kube_config_dir}}/kubelet.env
# stage1-fly mounts /proc /sys /dev so no need to duplicate the mounts
ExecStart=/usr/bin/rkt run \
{% if kubelet_load_modules == true %}
        --volume modprobe,kind=host,source=/usr/sbin/modprobe \
        --volume lib-modules,kind=host,source=/lib/modules \
{% endif %}
        --volume os-release,kind=host,source=/etc/os-release,readOnly=true \
        --volume hosts,kind=host,source=/etc/hosts,readOnly=true \
        --volume dns,kind=host,source=/etc/resolv.conf \
        --volume etc-kubernetes,kind=host,source={{ kube_config_dir }},readOnly=false \
        --volume etc-ssl-certs,kind=host,source=/etc/ssl/certs,readOnly=true \
        --volume etcd-ssl,kind=host,source={{ etcd_config_dir }},readOnly=true \
        --volume run,kind=host,source=/run,readOnly=false \
        {% for dir in ssl_ca_dirs -%}
        --volume {{ dir | regex_replace('^/(.*)$', '\\1' ) | regex_replace('/', '-') }},kind=host,source={{ dir }},readOnly=true \
        {% endfor -%}
        --volume var-lib-docker,kind=host,source={{ docker_daemon_graph }},readOnly=false \
        --volume var-lib-kubelet,kind=host,source=/var/lib/kubelet,readOnly=false,recursive=true \
        --volume var-log,kind=host,source=/var/log \
{% if kube_network_plugin in ["calico", "weave", "canal", "flannel", "contiv", "cilium"] %}
        --volume etc-cni,kind=host,source=/etc/cni,readOnly=true \
        --volume opt-cni,kind=host,source=/opt/cni,readOnly=true \
        --volume var-lib-cni,kind=host,source=/var/lib/cni,readOnly=false \
{# we can run into issues with double mounting /var/lib/kubelet #}
{# surely there's a better way to do this #}
{% if '/var/lib/kubelet' not in kubelet_flexvolumes_plugins_dir %}
        --volume flexvolumes,kind=host,source={{ kubelet_flexvolumes_plugins_dir }},readOnly=false \
{% endif -%}
{% if local_volume_provisioner_enabled %}
        --volume local-volume-provisioner-base-dir,kind=host,source={{ local_volume_provisioner_base_dir }},readOnly=false \
{# Not pretty, but needed to avoid double mount #}
{% if local_volume_provisioner_base_dir not in local_volume_provisioner_mount_dir and local_volume_provisioner_mount_dir not in local_volume_provisioner_base_dir %}
        --volume local-volume-provisioner-mount-dir,kind=host,source={{ local_volume_provisioner_mount_dir }},readOnly=false \
{% endif %}
{% endif %}
{% if kubelet_load_modules == true %}
        --mount volume=modprobe,target=/usr/sbin/modprobe \
        --mount volume=lib-modules,target=/lib/modules \
{% endif %}
        --mount volume=etc-cni,target=/etc/cni \
        --mount volume=opt-cni,target=/opt/cni \
        --mount volume=var-lib-cni,target=/var/lib/cni \
{% endif %}
        --mount volume=os-release,target=/etc/os-release \
        --mount volume=dns,target=/etc/resolv.conf \
        --mount volume=etc-kubernetes,target={{ kube_config_dir }} \
        --mount volume=etc-ssl-certs,target=/etc/ssl/certs \
        --mount volume=etcd-ssl,target={{ etcd_config_dir }} \
        --mount volume=run,target=/run \
        {% for dir in ssl_ca_dirs -%}
        --mount volume={{ dir | regex_replace('^/(.*)$', '\\1' ) | regex_replace('/', '-') }},target={{ dir }} \
        {% endfor -%}
        --mount volume=var-lib-docker,target=/var/lib/docker \
        --mount volume=var-lib-kubelet,target=/var/lib/kubelet \
        --mount volume=var-log,target=/var/log \
        --mount volume=hosts,target=/etc/hosts \
{# we can run into issues with double mounting /var/lib/kubelet #}
{# surely there's a better way to do this #}
{% if '/var/lib/kubelet' not in kubelet_flexvolumes_plugins_dir %}
        --mount volume=flexvolumes,target={{ kubelet_flexvolumes_plugins_dir }} \
{% endif -%}
{% if local_volume_provisioner_enabled %}
        --mount volume=local-volume-provisioner-base-dir,target={{ local_volume_provisioner_base_dir }} \
{# Not pretty, but needed to avoid double mount #}
{% if local_volume_provisioner_base_dir not in local_volume_provisioner_mount_dir and local_volume_provisioner_mount_dir not in local_volume_provisioner_base_dir %}
        --mount volume=local-volume-provisioner-mount-dir,target={{ local_volume_provisioner_mount_dir }} \
{% endif %}
{% endif %}
        --stage1-from-dir=stage1-fly.aci \
{% if kube_hyperkube_image_repo == "docker" %}
        --insecure-options=image \
        docker://{{ hyperkube_image_repo }}:{{ hyperkube_image_tag }} \
{% else %}
        {{ hyperkube_image_repo }}:{{ hyperkube_image_tag }} \
{% endif %}
        --uuid-file-save=/var/run/kubelet.uuid \
        --debug --exec=/kubelet -- \
                $KUBE_LOGTOSTDERR \
                $KUBE_LOG_LEVEL \
                $KUBELET_API_SERVER \
                $KUBELET_ADDRESS \
                $KUBELET_PORT \
                $KUBELET_HOSTNAME \
                $KUBE_ALLOW_PRIV \
                $KUBELET_ARGS \
                $DOCKER_SOCKET \
                $KUBELET_REGISTER_NODE \
                $KUBELET_NETWORK_PLUGIN \
                $KUBELET_VOLUME_PLUGIN \
                $KUBELET_CLOUDPROVIDER

ExecStop=-/usr/bin/rkt stop --uuid-file=/var/run/kubelet.uuid

[Install]
WantedBy=multi-user.target