k8s: wait for images to be pulled

It can take a while, so do it in a separate provisioning step.

Signed-off-by: Anders F Björklund <[email protected]>

Author: afbjorklund

templates/k8s.yaml

@@ -147,6 +147,14 @@ probes:
     fi
   hint: |
     See "/var/log/cloud-init-output.log" in the guest
+- description: "kubernetes images to be pulled"
+  script: |
+    #!/bin/bash
+    set -eux -o pipefail
+    if ! timeout 30s bash -c "images=\"$(kubeadm config images list)\"; until for image in \$images; do sudo crictl image -q \$image | grep -q sha256; done; do sleep 3; done"; then
+      echo >&2 "k8s images are not pulled yet"
+      exit 1
+    fi
 - description: "kubeadm to be completed"
   script: |
     #!/bin/bash