kubernetes使用iscsi卷创建pod

Question

我刚开始接触K8s，现在我一直在使用openfiler作为iscsi目标来创建一个包含iscsi卷的pod，为K8s主机节点提供一个LUN。我可以通过"multipath -l“看到磁盘：

mpatha (14f504e46494c455265305742724d2d7949544e2d736c4744) dm-3 OPNFILER,VIRTUAL-DISK    
size=1.0G features='0' hwhandler='0' wp=rw
|-+- policy='service-time 0' prio=0 status=active
| `- 33:0:0:0 sdb 8:16 active undef unknown
`-+- policy='service-time 0' prio=0 status=enabled
  `- 34:0:0:0 sdc 8:32 active undef unknown

或"cat /proc/scsi/scsi“

Attached devices:
Host: scsi0 Channel: 00 Id: 00 Lun: 00
  Vendor: VMware   Model: Virtual disk     Rev: 2.0 
  Type:   Direct-Access                    ANSI  SCSI revision: 06
Host: scsi3 Channel: 00 Id: 00 Lun: 00
  Vendor: NECVMWar Model: VMware SATA CD00 Rev: 1.00
  Type:   CD-ROM                           ANSI  SCSI revision: 05
Host: scsi33 Channel: 00 Id: 00 Lun: 00
  Vendor: OPNFILER Model: VIRTUAL-DISK     Rev: 0   
  Type:   Direct-Access                    ANSI  SCSI revision: 04
Host: scsi34 Channel: 00 Id: 00 Lun: 00
  Vendor: OPNFILER Model: VIRTUAL-DISK     Rev: 0   
  Type:   Direct-Access                    ANSI  SCSI revision: 04

我的部署yaml文件：

apiVersion: apps/v1
kind: Deployment
metadata:
  name: mysql-test
  labels:
    tier: db
    system: test
    name: mysql
spec:
  replicas: 1
  template:
    metadata:
      name: mysql
      labels:
        name: mysql
        tier: db
    spec:
      containers:
        - name: mysql
          image: linhnm/lab:linhnm-wp
          volumeMounts:
            - mountPath: /var/lib/mysql
              name: pv-sql
      volumes:
        - name: pv-sql
          iscsi:
            targetPortal: 172.20.30.76:3260
            iqn: iqn.2006-01.com.openfiler:tsn.11934dc96acf
            lun: 0
            fsType: ext4
            readOnly: false
  selector:
    matchLabels:
      tier: db
      name: mysql

我的K8s集群无法创建pod，下面是describe pod命令中的事件：

Events:
  Type     Reason                  Age               From                     Message
  ----     ------                  ----              ----                     -------
  Normal   Scheduled               3m                default-scheduler        Successfully assigned mysql-test-7f5d55b8d8-tdxkk to worker1
  Normal   SuccessfulAttachVolume  3m                attachdetach-controller  AttachVolume.Attach succeeded for volume "pv-sql"
  Normal   SuccessfulMountVolume   3m                kubelet, worker1         MountVolume.SetUp succeeded for volume "default-token-wqhhj"
  Warning  FailedMount             1m                kubelet, worker1         Unable to mount volumes for pod "mysql-test-7f5d55b8d8-tdxkk_default(bef99831-8cc9-11e8-a98d-00505695a133)": timeout expired waiting for volumes to attach or mount for pod "default"/"mysql-test-7f5d55b8d8-tdxkk". list of unmounted volumes=[pv-sql]. list of unattached volumes=[pv-sql default-token-wqhhj]
  Warning  FailedMount             43s (x8 over 2m)  kubelet, worker1         MountVolume.WaitForAttach failed for volume "pv-sql" : failed to get any path for iscsi disk, last err seen:
Could not attach disk: Timeout after 10s

谁能告诉我应该怎么调整我的实验室？或者我应该读什么材料来复习这个问题？谢谢

Answer 1

最后，我想我找到了问题的原因。可能是我的openfiler iscsi服务器。在使用targetd创建另一个linux iscsi服务器并将我的卷清单更改为新的属性后，K8s集群可以创建pod，然后平滑地附加卷。