Add support for iscsi volume

[de13]

RKE version:

v0.0.8-dev

Persistent volume configuration

apiVersion: v1
kind: PersistentVolume
metadata:
  name: iscsi-pv
spec:
  storageClassName: small
  capacity:
    storage: 5Gi
  accessModes:
    - ReadWriteOnce
  iscsi:
    targetPortal: 192.168.1.90
    iqn: "iqn.2014-12.world.srv:storage.target00"
    lun: 0
    fsType: 'ext4'
    readOnly: false
    chapAuthDiscovery: true
    chapAuthSession: true
    secretRef:
      name: chap-secret

Results:

E1213 21:43:19.493389 1416 nestedpendingoperations.go:264] Operation for ""kubernetes.io/iscsi/192.168.1.90:iqn.2014-12.world.srv:storage.target00:0"" failed. No retries permitted until 2017-12-13 21:45:21.493319898 +0000 UTC (durationBeforeRetry 2m2s). Error: MountVolume.WaitForAttach failed for volume "iscsi-pv" (UniqueName: "kubernetes.io/iscsi/192.168.1.90:iqn.2014-12.world.srv:storage.target00:0") pod "mariadb-86c44bb46b-44rzc" (UID: "500a91f9-e04e-11e7-8988-525400f27948") : executable file not found in $PATH

[galal-hussein]

@de13 looks like iscsiadm should be installed in kubelet container, you can try building your own custom kubernetes image with iscsiadm installed and specify this image in cluster.yml

[de13]

@galal-hussein sure, I already did it, but it doesn't solve the problem. Apparently, it's a know issue on Rancher cant-mount-iscsi-volume/5413/5.

E1214 05:42:50.651339    1383 nestedpendingoperations.go:264] Operation for "\"kubernetes.io/iscsi/192.168.1.90:iqn.2016-06.foo.kube:default:0\"" failed. No retries permitted until 2017-12-14 05:42:52.651315863 +0000 UTC (durationBeforeRetry 2s). Error: MountVolume.WaitForAttach failed for volume "iscsivol" (UniqueName: "kubernetes.io/iscsi/192.168.1.90:iqn.2016-06.foo.kube:default:0") pod "iscsipd" (UID: "8472ece2-e091-11e7-8830-52540092739a") : failed to get any path for iscsi disk, last err seen:
iscsi: failed to attach disk: Error: iscsiadm: default: 1 session requested, but 1 already present.
iscsiadm: Could not log into all portals
 (exit status 15)

[galal-hussein]

@de13 does this problem also happen with hyperkube image with open-iscsi installed?

[de13]

@galal-hussein not yet tried, but I will.

[galal-hussein]

should be solved by rancher/kubernetes-package#123, can be tested with v0.0.10-dev

[deniseschannon]

@de13 if the v0.0.10-dev release doesn't work, please re-open.