Templates: Set provider ID directly via kubelet

This commit sets the provider ID in the flatcar templates.
To avoid issues with potential mismatches between node names and
openstack servers we can configure the kubelet to set the provider ID.
Otherwise, the cloud controller will try to match nodes and servers
based on just the name. The names can differ because of special
characters, like dots. When this happens, the cloud controller will be
unable to match them and thus believe that the node has no underlying
server.

Co-authored-by: Mathieu Tortuyaux <[email protected]>

Author: lentzi90

kustomize/v1alpha7/flatcar/patch-flatcar.yaml

@@ -17,9 +17,13 @@ spec:
     joinConfiguration:
       nodeRegistration:
         name: $${COREOS_OPENSTACK_HOSTNAME}
+        kubeletExtraArgs:
+          provider-id: openstack:///$${COREOS_OPENSTACK_INSTANCE_ID}
     initConfiguration:
       nodeRegistration:
         name: $${COREOS_OPENSTACK_HOSTNAME}
+        kubeletExtraArgs:
+          provider-id: openstack:///$${COREOS_OPENSTACK_INSTANCE_ID}
     format: ignition
     ignition:
       containerLinuxConfig:
@@ -41,6 +45,7 @@ spec:
                   EnvironmentFile=/run/metadata/flatcar
     preKubeadmCommands:
       - export COREOS_OPENSTACK_HOSTNAME=$${COREOS_OPENSTACK_HOSTNAME%.*}
+      - export COREOS_OPENSTACK_INSTANCE_ID=$${COREOS_OPENSTACK_INSTANCE_ID%.*}
       - envsubst < /etc/kubeadm.yml > /etc/kubeadm.yml.tmp
       - mv /etc/kubeadm.yml.tmp /etc/kubeadm.yml
 ---
@@ -54,8 +59,11 @@ spec:
       joinConfiguration:
         nodeRegistration:
           name: $${COREOS_OPENSTACK_HOSTNAME}
+          kubeletExtraArgs:
+            provider-id: openstack:///$${COREOS_OPENSTACK_INSTANCE_ID}
       preKubeadmCommands:
         - export COREOS_OPENSTACK_HOSTNAME=$${COREOS_OPENSTACK_HOSTNAME%.*}
+        - export COREOS_OPENSTACK_INSTANCE_ID=$${COREOS_OPENSTACK_INSTANCE_ID%.*}
         - envsubst < /etc/kubeadm.yml > /etc/kubeadm.yml.tmp
         - mv /etc/kubeadm.yml.tmp /etc/kubeadm.yml
       format: ignition

templates/cluster-template-flatcar.yaml

@@ -39,9 +39,11 @@ spec:
         nodeRegistration:
           kubeletExtraArgs:
             cloud-provider: external
+            provider-id: openstack:///$${COREOS_OPENSTACK_INSTANCE_ID}
           name: $${COREOS_OPENSTACK_HOSTNAME}
       preKubeadmCommands:
       - export COREOS_OPENSTACK_HOSTNAME=$${COREOS_OPENSTACK_HOSTNAME%.*}
+      - export COREOS_OPENSTACK_INSTANCE_ID=$${COREOS_OPENSTACK_INSTANCE_ID%.*}
       - envsubst < /etc/kubeadm.yml > /etc/kubeadm.yml.tmp
       - mv /etc/kubeadm.yml.tmp /etc/kubeadm.yml
 ---
@@ -125,14 +127,17 @@ spec:
       nodeRegistration:
         kubeletExtraArgs:
           cloud-provider: external
+          provider-id: openstack:///$${COREOS_OPENSTACK_INSTANCE_ID}
         name: $${COREOS_OPENSTACK_HOSTNAME}
     joinConfiguration:
       nodeRegistration:
         kubeletExtraArgs:
           cloud-provider: external
+          provider-id: openstack:///$${COREOS_OPENSTACK_INSTANCE_ID}
         name: $${COREOS_OPENSTACK_HOSTNAME}
     preKubeadmCommands:
     - export COREOS_OPENSTACK_HOSTNAME=$${COREOS_OPENSTACK_HOSTNAME%.*}
+    - export COREOS_OPENSTACK_INSTANCE_ID=$${COREOS_OPENSTACK_INSTANCE_ID%.*}
     - envsubst < /etc/kubeadm.yml > /etc/kubeadm.yml.tmp
     - mv /etc/kubeadm.yml.tmp /etc/kubeadm.yml
   machineTemplate: