Can't scale WordPress catalog service with persistent volumes

[andymelichar]

• Set up new Rancher 2.0 Install running in container on jumpbox behind nginx reverse proxy
• Create an Ubuntu 16.04 cluster on Digital Ocean via UI
• Cluster builds successfully
• Launch Longhorn from Catalog, installs successfully
• Launch new WordPress library app
  • Select persistent storage for MariaDB and WordPress, select Longhorn as volume driver
• WordPress and Maria pods start up on a single node successfully, can reach it via ingress just fine, persistent volumes for the initial pods show up in Longhorn UI
• Scale up either the Maria or WordPress pod to more than 1 replica
• Original pods stays functional
• Scaled up/new pods don't create
• Describe failed pod and see that the volume didn't mount:

  Type     Reason                 Age                From               Message
  ----     ------                 ----               ----               -------
  Normal   Scheduled              54m                default-scheduler  Successfully assigned wordpress-wordpress-75c7bf fb99-hn4g6 to nyc3
  Normal   SuccessfulMountVolume  54m                kubelet, nyc3      MountVolume.SetUp succeeded for volume "default-token-pshjl"
  Warning  FailedMount            9m (x22 over 52m)  kubelet, nyc3      Unable to mount volumes for pod "wordpress-wordpress-75c7bffb99-hn4g6_wordpress(94340e79-7a5b-11e8-bb78-4ebac54d06b5)": timeout expired waiting for volumes to attach or mount for pod "wordpress"/"wordpress-wordpress-75c7bffb99-hn4g6". list of unmounted volumes=[wordpress-data]. list of unattached volumes=[wordpress-data default-token-pshjl]
  Warning  FailedMount            3m (x33 over 54m)  kubelet, nyc3      MountVolume.SetUp failed for volume "pvc-05f1359a-7a5b-11e8-bbba-aa10d9557ea4" : mount command failed, status: Failure, reason: create volume fail: fail to parse size error parsing size 'null': quantities must match the regular expression '^([+-]?[0-9.]+)([eEinumkKMGTP]*[-+]?[0-9]*)$'

[dnauck]

Reported the same here: https://github.com/rancher/charts/issues/10 and here helm/charts#1863

[stale]

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