1、删除kubeflow后namespace无法删除

问题

[root@ master kubeflow]# kfctl delete -f kfctl_k8s_istio.0.7.0.yaml

Error: couldn't delete KfApp:  (kubeflow.error): Code 500 with message: kfApp Delete failed for kustomize:  (kubeflow.error): Code 400 with message: couldn't delete namespace kubeflow Error: Operation cannot be fulfilled on namespaces "kubeflow": The system is ensuring all content is removed from this namespace.  Upon completion, this namespace will automatically be purged by the system.
Usage:
  kfctl delete [flags]

Flags:
      --delete_storage   Set if you want to delete app's storage cluster used for mlpipeline.
  -f, --file string      The local config file of KfDef.
  -h, --help             help for delete
  -V, --verbose          verbose output default is false

couldn't delete KfApp:  (kubeflow.error): Code 500 with message: kfApp Delete failed for kustomize:  (kubeflow.error): Code 400 with message: couldn't delete namespace kubeflow Error: Operation cannot be fulfilled on namespaces "kubeflow": The system is ensuring all content is removed from this namespace.  Upon completion, this namespace will automatically be purged by the system.

解决

[root@master kubeflow]# kubectl get ns

[root@ master kubeflow]#kubectl get namespace kubeflow -o json > tmp.json

删除tmp.json中的spec节点，k8s集群是携带认证的

新开一个窗口，手动kube-apiserver开代理端口

[root@ master kubeflow]#kubectl proxy --port=8080
[root@ master kubeflow]#curl -k -H "Content-Type: application/json" -X PUT --data-binary @tmp.json http://127.0.0.1:8080/api/v1/namespaces/kubeflow/finalize

再执行删除操作操作

[root@master kubeflow]# kfctl delete -f kfctl_k8s_istio.0.7.0.yaml

2、jupyter pod报错MountVolume.SetUp failed for volume

问题

  Normal   Scheduled    19m                   default-scheduler    Successfully assigned kubeflow/jupyter-web-app-deployment-84
  Warning  FailedMount  19m                   kubelet, node1  MountVolume.SetUp failed for volume "config-volume" : couldntimed out waiting for the condition
  Warning  FailedMount  19m                   kubelet, node1  MountVolume.SetUp failed for volume "jupyter-web-app-serviceldn't propagate object cache: timed out waiting for the condition
  Warning  Failed       15m                   kubelet, node1  Failed to pull image "gcr.io/kubeflow-images-public/jupyter-: code = Unknown desc = Get https://gcr.io/v1/_ping: dial tcp xx.xx.xx.xx:443: i/o timeout

解决
查看pvc信息

[root@master kubeflow]#kubectl -n kubeflow get pvc

[root@master kubeflow]# kubectl describe pvc minio-pv-claim -n kubeflow

发现pv未创建
使用nfs作为文件服务。如果不熟nfs可以搜索网上资料。

for i in $(seq 1 4); do
cat <<EOF | kubectl create -f -
apiVersion: v1
kind: PersistentVolume
metadata:
    name: kubeflow-pv${i}
spec:
  capacity:
    storage: 10Gi
  accessModes:
    - ReadWriteOnce
  nfs:
    server: 172.18.43.250
    path: /ssd/nfs-data/kubeflow/kubeflow-pv${i}
EOF
 done

3、手动pull了镜像，并重新打了tag，但是一直提示无法pull镜像

问题

[root@master kubeflow]# kubectl describe pod admission-webhook-bootstrap-stateful-set -n kubeflow

上图image，镜像的tag要和本地镜像一致，如果不一致，在这里修改。
比如有的pod pull镜像是docker pull gcr.azk8s.cn/kubeflow-images-public/notebook-controller@sha256:6490f737000bd1d2520ac4b8cbde2b09749cdb291b1967ddda95d05131db49db
那么在上图，要将@sha256:6490f737000bd1d2520ac4b8cbde2b09749cdb291b1967ddda95d05131db49db改成重新打的tag

怎么区分是statefulset还是deployment？
pod的name的后面如果是-0、-1、-2数字，那么就是statefulset，否则就是deployment
最准确的方式是通过查看kubectl describe pod {podname} -n {namespace}

解决
imagePullPolicy策略是Always，要修改成IfNotPresent
修改镜像拉取策略

[root@master kubeflow]# kubectl edit statefulset admission-webhook-bootstrap-stateful-set -n kubeflow
[root@master kubeflow]# kubectl edit deployment admission-webhook-deployment -n kubeflow

修改后重建pod。删除pod后会自动重建。

[root@master kubeflow]#kubectl delete pod admission-webhook-bootstrap-stateful-set-0 -n kubeflow

4、某个pod状态一直是pending

问题

[root@master ~]#kubectl get pods --all-namespaces

查看到某个pod状态一直是pending

[root@master ~]# kubectl describe pod mysql-c7884778-g69hk -n kubeflow
  Warning  FailedScheduling  19s (x14 over 18m)  default-scheduler  0/3 nodes are available: 1 node(s) had taints that the pod didn't tolerate, 2 node(s) didn't find available persistent volumes to bind.

直译意思是节点有了污点无法容忍
使用kubeadm搭建的集群默认就给 master 节点添加了一个污点标记，所以pod 都没有被调度到 master 上去

[root@master ~]#kubectl get no -o yaml | grep taint -A 5

解决

[root@master ~]#kubectl describe node master（注：master node name）

允许master节点部署pod，使用命令如下:

[root@master ~]#kubectl taint nodes --all node-role.kubernetes.io/master-

输出如下:
node “k8s” untainted
如果输出error: taint “node-role.kubernetes.io/master:” not found 错误忽略
再describe一下

另：禁止master部署pod

[root@master ~]#kubectl taint nodes k8s node-role.kubernetes.io/master=true:NoSchedule

5、Pod状态一直是CrashLoopBackOff

问题
describe和log都没有发现pod有错误，但是pod一直是CrashLoopBackOff状态

解决
删除重建pod

[root@master ssd]# kubectl delete pod kfserving-controller-manager-0 -n kubeflow

6、minio和mysql Pod一直是pending状态

问题

[root@master pvc]# kubectl get pods --all-namespaces

查看pod信息，发现pvc没有绑定

[root@master ~]# kubectl -n kubeflow describe pod minio-764648495-s4wxn

解决

[root@master pvc]# kubectl -n kubeflow get pvc

pvc一直pending状态

查看pvc描述

[root@master pvc]# kubectl get pvc minio-pv-claim -n kubeflow -o yaml

创建pv

[root@master pvc]# vi metadatapv.yaml

kind: PersistentVolume
apiVersion: v1
metadata:
  name: metadata-pv
  labels:
    type: local
spec:
  storageClassName: local
  capacity:
    storage: 25Gi
  accessModes:
    - ReadWriteOnce
  hostPath:
path: "/ssd/nfs-data/kubeflow/metadata

创建nfs pv

apiVersion: v1
kind: PersistentVolume
metadata:
    name: metadata-pv
spec:
  capacity:
    storage: 25Gi
  accessModes:
    - ReadWriteOnce
  nfs:
    server: 192.168.1.100
    path: /ssd/nfs-data/kubeflow/metadata

再查看minio、mysql状态

7、删除pv，pv状态一直是terminating

问题

[root@master pvc]# kubectl -n kubeflow get pvc
[root@master pvc]# kubectl get pv
[root@master pvc]# kubectl delete pv katib-pv

解决
执行

[root@master pvc]# kubectl patch pv katib-pv -p '{"metadata":{"finalizers":null}}'

8、a container name must be specified for

问题

[root@master ~]# kubectl -n istio-system logs istio-policy-6f74d9d95d-6xq28
Error from server (BadRequest): a container name must be specified for pod istio-policy-6f74d9d95d-6xq28, choose one of: [mixer istio-proxy]

解决
一个pod有多个容器，命令要指定容器

[root@master ~]# kubectl -n istio-system logs istio-policy-6f74d9d95d-6xq28 -c mixer

9、疑似有相同的pod

问题

[root@master ~]# kubectl get pods --all-namespaces

解决
查看deploy

[root@master ~]# kubectl get deploy -n knative-serving
[root@master ~]# kubectl get rs -n knative-serving 

删除多余的，把ImagePullBackOff的pod删除
遇到这种情况，先删除rs，再删除pod

[root@master ~]# kubectl delete rs activator-5484756f7b -n knative-serving
replicaset.extensions "activator-5484756f7b" deleted

10、重新安装后，kubeflow相关的所有pod都查询不到

问题
重新安装后，kubeflow相关的所有pod都查询不到，只能查询到rs、deploy、svc，但是rs、deploy状态都不对




rs日志错误信息

[root@master kubeflow]# kubectl describe rs centraldashboard-d45b597ff -n kubeflow
  Warning  FailedCreate  60s (x16 over 5m15s)  replicaset-controller  Error creating: Internal error occurred: failed calling webhook "inferenceservice.kfserving-webhook-server.pod-mutator": Post https://kfserving-webhook-server-service.kubeflow.svc:443/mutate-pods?timeout=30s: service "kfserving-webhook-server-service" not found

原因：疑似与动态准入控制有关，还没有找到资料

解决
执行删除步骤之后，再执行如下命令

[root@master kubeflow]#kubectl get mutatingwebhookconfigurations
[root@master kubeflow]#kubectl delete mutatingwebhookconfigurations “资源名”

11、Mysql节点报错Operation not permitted

问题

Mysql要使用pv，pv挂载的目录是nfs目录，权限配置有问题，mysql无法修改目录权限

解决
报错的nfs的配置

解决问题的配置

[root@master pv]# cat /etc/exports
/ssd/nfsdata *(rw,no_root_squash,sync)
/ssd/nfsdata/kubeflow/kubeflow1 *(rw,no_root_squash,sync)
/ssd/nfsdata/kubeflow/kubeflow2 *(rw,no_root_squash,sync)
/ssd/nfsdata/kubeflow/kubeflow3 *(rw,no_root_squash,sync)
/ssd/nfsdata/kubeflow/kubeflow4 *(rw,no_root_squash,sync)

使配置生效

[root@master pv]# exportfs -r

重启rpcbind、nfs服务

[root@master pv]# systemctl restart rpcbind && systemctl restart nfs

注：我使用nfs服务作为pv挂载目录，如果不是nfs服务，则是其他原因

12、访问notebook提示错误

问题
通过istio-ingressgateway访问Kubeflow Dashboard，进入notebook提示一个错误
No default Storage Class is set. Can’t create new Disks for the new Notebook. Please use an Existing Disk

原因是没有配置默认的StorageClass

解决
使用nfs作为provisioner，先安装插件

apiVersion: v1
kind: ServiceAccount
metadata:
  name: nfs-client-provisioner
---
kind: Deployment
apiVersion: extensions/v1beta1
metadata:
  name: nfs-provisioner
spec:
  replicas: 1
  strategy:
    type: Recreate
  template:
    metadata:
      labels:
        app: nfs-provisioner
    spec:
      serviceAccount: nfs-client-provisioner
      containers:
        - name: nfs-provisioner
          image: registry.cn-hangzhou.aliyuncs.com/open-ali/nfs-client-provisioner
          volumeMounts:
            - name: nfs-client-root
              mountPath: /persistentvolumes
          env:
            - name: PROVISIONER_NAME
              value: kubeflow/nfs
            - name: NFS_SERVER
              value: 172.18.43.250
            - name: NFS_PATH
              value: /ssd/nfsdata/kubeflow/defstor
      volumes:
        - name: nfs-client-root
          nfs:
            server: 172.18.43.250
            path: /ssd/nfsdata/kubeflow/defstor

集群使用了rbac，则需要创建。注意，这里的namespace如果不存在，要先创建

kind: ClusterRoleBinding
apiVersion: rbac.authorization.k8s.io/v1beta1
metadata:
  name: run-nfs-client-provisioner
subjects:
  - kind: ServiceAccount
    name: nfs-client-provisioner
    namespace: kubeflow-anonymous
roleRef:
  kind: ClusterRole
  name: nfs-client-provisioner-runner
  apiGroup: rbac.authorization.k8s.io
---
kind: ClusterRole
apiVersion: rbac.authorization.k8s.io/v1beta1
metadata:
  name: nfs-client-provisioner-runner
rules:
  - apiGroups: [""]
    resources: ["persistentvolumes"]
    verbs: ["get", "list", "watch", "create", "delete"]
  - apiGroups: [""]
    resources: ["persistentvolumeclaims"]
    verbs: ["get", "list", "watch", "update"]
  - apiGroups: ["storage.k8s.io"]
    resources: ["storageclasses"]
    verbs: ["get", "list", "watch"]
  - apiGroups: [""]
    resources: ["events"]
verbs: ["list", "watch", "create", "update", "patch"]

创建StorageClass

apiVersion: storage.k8s.io/v1
kind: StorageClass
metadata:
  name: kubeflow-nfs-storage
provisioner: kubeflow/nfs

将新创建的StorageClass设为默认

[root@master pv]# kubectl patch storageclass kubeflow-nfs-storage -p '{"metadata": {"annotations":{"storageclass.kubernetes.io/is-default-class":"true"}}}'

再次进入notebook不报错了

13、Katib-db pod不断重启

问题
查看日志

[root@master pv]# Kubectl logs katib-db-76c4bd88b-x9cks -n kubeflow

查看pod描述

[root@master pv]# Kubectl describe pod katib-db-76c4bd88b-x9cks -n kubeflow

katib-db pod的健康探测机制，执行mysqladmin一直失败
进入pod容器，查找mysqladmin，发现确实没有mysqladmin

[root@node3 ~]# kubectl exec -it katib-db-76c4bd88b-x9cks -n kubeflow bash

解决
1、 如果确定pod启动没有问题，可以去掉健康探测机制
查询

[root@master pv]# kubectl get deploy katib-db -n kubeflow -o yaml

编辑去掉livenessProbe

[root@master pv]# kubectl edit deploy katib-db -n kubeflow -o yaml

2、 换个有mysqladmin的镜像

14、重装后katib-db pod一直是CrashLoopBackOff

问题
重装后katib-db pod一直是CrashLoopBackOff，logs看了一下pod日志，报错如下

2020-02-12T01:09:10.520333Z 1 [Note] InnoDB: Completed initialization of buffer pool
2020-02-12T01:09:10.521524Z 0 [Note] InnoDB: If the mysqld execution user is authorized, page cleaner thread priority can be changed. See the man page of setpriority().
2020-02-12T01:09:10.537059Z 1 [ERROR] InnoDB: Unsupported redo log format. The redo log was created with MySQL 8.0.19. Please follow the instructions at http://dev.mysql.com/doc/refman/8.0/en/upgrading-downgrading.html
2020-02-12T01:09:10.537081Z 1 [ERROR] InnoDB: Plugin initialization aborted with error Generic error
2020-02-12T01:09:11.137510Z 1 [ERROR] Failed to initialize DD Storage Engine
2020-02-12T01:09:11.137679Z 0 [ERROR] Data Dictionary initialization failed.

原因是pv目录旧文件导致mysql重做日志格式失败

解决
进入pv目录，清理所有文件
删除所有旧文件和目录

Delete pod重建

15、重装后访问kubeflow，不显示创建namespace的界面

问题


原因是缺少profile配置文件
官方文档多租户指导
https://www.kubeflow.org/docs/other-guides/multi-user-overview/#current-integration-and-limitations

解决
创建profile

[root@master defstor]# kubectl create -f fish.yaml
apiVersion: kubeflow.org/v1beta1
kind: Profile
metadata:
  name: fish   # replace with the name of profile you want
spec:
  owner:
    kind: User
    name: fish@fish.com   # replace with the email of the user

16、界面创建notebook的时候，一直创建中

问题

原因是pv没有创建

[root@master defstor]# kubectl describe pod fish-0 -n namespace

解决
创建workspace和Volume使用的pv

[root@master defstor]# kubectl create -f workspace-pv.yaml
kind: PersistentVolume
apiVersion: v1
metadata:
  name: workspace-fish
  namespace: fish
spec:
  storageClassName: kubeflow-nfs-storage
  capacity:
    storage: 10Gi
  accessModes:
    - ReadWriteOnce
  nfs:
    server: 192.168.1.100
    path: /ssd/nfsdata/k8s/defstor

[root@master defstor]# kubectl create -f vol-pv.yaml
kind: PersistentVolume
apiVersion: v1
metadata:
  name: fish-vol-1
  namespace: fish
spec:
  storageClassName: kubeflow-nfs-storage
  capacity:
    storage: 10Gi
  accessModes:
    - ReadWriteOnce
  nfs:
    server: 192.168.1.100
    path: /ssd/nfsdata/k8s/defstor