Rook:等待pod连接/装载卷时超时

Question

k8s版本: v1.9

环境: VirtualBox

操作系统: Coreos

它是1个节点的Kubernetes集群，我按照以下步骤操作：

1. 跟随https://rook.io/docs/rook/v0.5/k8s-pre-reqs.html并更新了kubelet withEnvironment="RKT_OPTS=--volume modprobe，kind=host，source=/usr/sbin/modprobe \

--挂载目标，volume=modprobe =/usr/sbin/modprobe\

--卷库模块，kind=host，源=/lib/模块\

--mount volume=lib-modules，target=/lib/modules \

--uuid-file-save=/var/run/kubelet-pod.uuid“

• 安装的ceph实用程序

rbd -v

ceph版本10.2.2 (45107e21c568dd033c2f0a3107dec8f0b0e58374)

所有rook pod都工作正常，但MySQL pod失败，并显示错误“timeout expired waiting for pod to attach/mount for pod”

➜  kubectl get pod -n rook-system
NAME                             READY     STATUS    RESTARTS   AGE
rook-agent-rqw6j                 1/1       Running   0          21m
rook-operator-5457d48c94-bhh2z   1/1       Running   0          22m
➜   kubectl get pod -n rook
NAME                             READY     STATUS    RESTARTS   AGE
rook-api-848df956bf-fhmg2        1/1       Running   0          20m
rook-ceph-mgr0-cfccfd6b8-8brxz   1/1       Running   0          20m
rook-ceph-mon0-xdd77             1/1       Running   0          21m
rook-ceph-mon1-gntgh             1/1       Running   0          20m
rook-ceph-mon2-srmg8             1/1       Running   0          20m
rook-ceph-osd-84wmn              1/1       Running   0          20m
➜   kubectl get pv
NAME                                       CAPACITY   ACCESSMODES   RECLAIMPOLICY   STATUS    CLAIM                    STORAGECLASS   REASON    AGE
pvc-6a4c5c2a-127d-11e8-a846-080027b424ef   20Gi       RWO           Delete          Bound     default/mysql-pv-claim   rook-block               15m
➜  kubectl get pvc
NAME             STATUS    VOLUME                                     CAPACITY   ACCESSMODES   STORAGECLASS   AGE
mysql-pv-claim   Bound     pvc-6a4c5c2a-127d-11e8-a846-080027b424ef   20Gi       RWO           rook-block     15m
kubectl get pods
NAME                               READY     STATUS              RESTARTS   AGE
wordpress-mysql-557ffc4f69-8zxsq   0/1       ContainerCreating   0          16m


Error when I describe pod : FailedMount Unable to mount volumes for pod "wordpress-mysql-557ffc4f69-8zxsq_default(6a932df1-127d-11e8-a846-080027b424ef)": timeout expired waiting for volumes to attach/mount for pod "default"/"wordpress-mysql-557ffc4f69-8zxsq". list of unattached/unmounted volumes=[mysql-persistent-storage]

还向rook-operator.yaml添加了以下选项

- name: FLEXVOLUME_DIR_PATH
  value: "/var/lib/kubelet/volumeplugins"

你能帮个忙吗？如果你需要更多的细节，请让我知道。我检查了类似的问题，但解决方案不起作用。

Answer 1

您是否使用cephfs或rbd卷作为Ceph的后端？以下是一些需要检查的内容：

1. 请确认您的Pod可以很好地与ceph群集通信，这看起来是您尝试使用的ceph卷的通信问题。