containerd: change default resolvconf_mode to host_resolvconf (#8247)

* containerd: change default resolvconf_mode to host_resolvconf

* Wait for kube-apiserver to come back after pod refresh

* Handle resolv.conf gracefully

* Retain currently configured DNS entries to ensure we don't break the resolvers

* Suse uses wickedd for network management so no dhcp hooks

* Molecule: increase ansible timeout

* CI: Increase ansible timeout to 120s for Packet jobs

roles/kubernetes/preinstall/handlers/main.yml

@@ -9,6 +9,7 @@
     - Preinstall | restart kube-controller-manager crio/containerd
     - Preinstall | restart kube-apiserver docker
     - Preinstall | restart kube-apiserver crio/containerd
+    - Preinstall | wait for the apiserver to be running
   when: not ansible_os_family in ["Flatcar", "Flatcar Container Linux by Kinvolk"] and not is_fedora_coreos
 
 - name: Preinstall | update resolvconf for Flatcar Container Linux by Kinvolk
@@ -101,6 +102,21 @@
     - dns_mode != 'none'
     - resolvconf_mode == 'host_resolvconf'
 
+# When running this as the last phase ensure we wait for kube-apiserver to come up
+- name: Preinstall | wait for the apiserver to be running
+  uri:
+    url: "{{ kube_apiserver_endpoint }}/healthz"
+    validate_certs: no
+  register: result
+  until: result.status == 200
+  retries: 60
+  delay: 1
+  when:
+    - dns_late
+    - inventory_hostname in groups['kube_control_plane']
+    - dns_mode != 'none'
+    - resolvconf_mode == 'host_resolvconf'
+
 - name: Preinstall | Restart systemd-resolved
   service:
     name: systemd-resolved