save kubelet cert between reboots on CVM

cluster/saltbase/salt/kubelet/default

@@ -181,6 +181,7 @@
 {% endif -%}
 
 {% set kubelet_auth = "--anonymous-auth=false --authorization-mode=Webhook --client-ca-file=" + pillar.get('ca_cert_bundle_path', '/var/lib/kubelet/ca.crt') %}
+{% set pki=" --cert-dir=/var/lib/kubelet/pki" -%}
 
 # test_args has to be kept at the end, so they'll overwrite any prior configuration
-DAEMON_ARGS="{{daemon_args}} {{api_servers}} {{debugging_handlers}} {{hostname_override}} {{cloud_provider}} {{cloud_config}} {{config}} {{manifest_url}} --allow-privileged={{pillar['allow_privileged']}} {{log_level}} {{cluster_dns}} {{cluster_domain}} {{docker_root}} {{kubelet_root}}  {{non_masquerade_cidr}} {{cgroup_root}} {{system_container}} {{pod_cidr}} {{ master_kubelet_args }} {{cpu_cfs_quota}} {{network_plugin}} {{kubelet_port}} {{ hairpin_mode }} {{enable_custom_metrics}} {{runtime_container}} {{kubelet_container}} {{node_labels}} {{eviction_hard}} {{kubelet_auth}} {{feature_gates}} {{test_args}}"
+DAEMON_ARGS="{{daemon_args}} {{api_servers}} {{debugging_handlers}} {{hostname_override}} {{cloud_provider}} {{cloud_config}} {{config}} {{manifest_url}} --allow-privileged={{pillar['allow_privileged']}} {{log_level}} {{cluster_dns}} {{cluster_domain}} {{docker_root}} {{kubelet_root}}  {{non_masquerade_cidr}} {{cgroup_root}} {{system_container}} {{pod_cidr}} {{ master_kubelet_args }} {{cpu_cfs_quota}} {{network_plugin}} {{kubelet_port}} {{ hairpin_mode }} {{enable_custom_metrics}} {{runtime_container}} {{kubelet_container}} {{node_labels}} {{eviction_hard}} {{kubelet_auth}} {{pki}} {{feature_gates}} {{test_args}}"

cluster/saltbase/salt/kubelet/init.sls

@@ -19,6 +19,11 @@
     - group: root
     - mode: 755
 
+/var/lib/kubelet/pki:
+  file.directory:
+    - mode: 755
+    - makedirs: True
+
 # The default here is that this file is blank. If this is the case, the kubelet
 # won't be able to parse it as JSON and it will not be able to publish events
 # to the apiserver. You'll see a single error line in the kubelet start up file
@@ -57,6 +62,7 @@ fix-service-kubelet:
   cmd.wait:
     - name: /opt/kubernetes/helpers/services bounce kubelet
     - watch:
+      - file: /var/lib/kubelet/pki
       - file: /usr/local/bin/kubelet
       - file: {{ pillar.get('systemd_system_path') }}/kubelet.service
       - file: {{ environment_file }}