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Kubeflow 部署(使用 kfctl_k8s_istio)
安装 Kubeflow的一些指南(使用 kfctl_k8s_istio 配置部署到已有的Kubernetes集群中)。该配置清单创建Kubeflow的核心部件部署,但不包括外部依赖,可以根据您的环境需要进行优化。KubeFlow 1.2.0部署到Ubuntu20.04和k8s 1.21.0,其它平台可能有些变化。
该Kubeflow deployment要求 StorageClass 支持 dynamic volume provisioner。确认缺省的StorageClass的 provisioner
域的设置。如果换没有 provisioner, 确保配置了 volume provisioning,按照下面的描述在 Kubernetes cluster 进行设置(参考 below)。
使用 kfctl_k8s_istio.v1.2.0.yaml 配置安装,需要考虑下面的选项:
-
Disabling istio installation – 如果 Kubernetes cluster 已有 Istio 安装,可以选择不安装Istio,通过一移除配置文件kfctl_k8s_istio.v1.0.2.yaml中的
istio-crds
和istio-install
参数。
准备环境
下载 kfctl 的 Kubeflow CLI 工具,然后手动设置环境变量:
-
下载kfctl v1.2.0 发布版本,到 Kubeflow releases page。
wget https://github.com/kubeflow/kfctl/releases/download/v1.2.0/kfctl_v1.2.0-0-gbc038f9_linux.tar.gz tar -vxf kfctl_v1.2.0-0-gbc038f9_linux.tar.gz sudo cp kfctl /usr/bin/
-
创建环境变量,简化部署过程:
# The following command is optional. It adds the kfctl binary to your path.# If you don't add kfctl to your path, you must use the full path# each time you run kfctl.# Use only alphanumeric characters or - in the directory name.export PATH=$PATH:"<path-to-kfctl>"##实际如下:##export PATH=$PATH:"/home/supermap/openthings/kubeflow"# Set KF_NAME to the name of your Kubeflow deployment. You also use this# value as directory name when creating your configuration directory.# For example, your deployment name can be 'my-kubeflow' or 'kf-test'.export KF_NAME=<your choice of name for the Kubeflow deployment>##实际如下:##export KF_NAME="kubeflow"# Set the path to the base directory where you want to store one or more # Kubeflow deployments. For example, /opt/.# Then set the Kubeflow application directory for this deployment.export BASE_DIR=<path to a base directory>export KF_DIR=${BASE_DIR}/${KF_NAME}##实际如下:##export BASE_DIR="/home/supermap/openthings/"##export KF_DIR=${BASE_DIR}/${KF_NAME}# Set the configuration file to use when deploying Kubeflow.# The following configuration installs Istio by default. Comment out # the Istio components in the config file to skip Istio installation. # See https://github.com/kubeflow/kubeflow/pull/3663export CONFIG_URI="https://raw.githubusercontent.com/kubeflow/manifests/v1.2-branch/kfdef/kfctl_k8s_istio.v1.2.0.yaml"##实际如下:##export CONFIG_URI=${BASE_DIR}/${KF_NAME}/kfctl_k8s_istio.v1.2.0.yaml
注意:
-
${KF_NAME} – Kubeflow 部署的名称。如果要定制部署的 deployment name,通过该参数指定。例如,
my-kubeflow
或kf-test
。该 KF_NAME 必须小写字母或者 ‘-', 开始和结束必须为字母。该变量不能超过 25 个字符。只能包含名称,不能包含目录路径。同时将作为创建目录的名称,用于保存 Kubeflow configurations,即Kubeflow application directory。 -
${KF_DIR} – Kubeflow application directory的全路径。
-
${CONFIG_URI} -该 GitHub address,位于 https://raw.githubusercontent.com/kubeflow/manifests/v1.2-branch/kfdef/kfctl_k8s_istio.v1.2.0.yaml。当运行
kfctl apply
或kfctl build
(see the next step), kfctl 创建一个 YAML 文件的本地版本,可以进一步定制化。
⚠️注意:
-
运行kfctl build或apply -V -f xxx时,出现manifest下载不成功,可以将其下载下来,然后修改kfctl_k8s_istio.v1.2.0.yaml的下面内容,将manifest指向本地路径。如下:
repos: - name: manifests uri: /home/supermap/openthings/kubeflow/v1.2.0.tar.gz version: v1.2-branch
设置和部署 Kubeflow
使用缺省设置来设置和部署 Kubeflow using the default settings,运行 kfctl apply
如下:
mkdir -p ${KF_DIR} cd ${KF_DIR} kfctl apply -V -f ${CONFIG_URI}
检查 resources deployed in namespace kubeflow
:
kubectl -n kubeflow get all
可选,设置以后部署的配置参数:
在部署 Kubeflow时,如果需要定制安装参数,可以编辑该配置文件,然后运行 Kubeflow的部署命令即可:
-
运行
kfctl build
命令设置安装参数:mkdir -p ${KF_DIR} cd ${KF_DIR} kfctl build -V -f ${CONFIG_URI}
-
编辑配置文件,描述如上 customizing your Kubeflow deployment。
-
设置环境变量指向本地的配置文件:
export CONFIG_FILE=${KF_DIR}/kfctl_k8s_istio.v1.2.0.yaml
-
运行
kfctl apply
目录实施 Kubeflow 部署:kfctl apply -V -f ${CONFIG_FILE}
出现错误:
2021/04/28 10:24:44 absolute path error in '/home/supermap/openthings/kubeflow/.cache/manifests/namespaces/base' : evalsymlink failure on '/home/supermap/openthings/kubeflow/.cache/manifests/namespaces/base' : lstat /home/supermap/openthings/kubeflow/.cache/manifests/namespaces: no such file or directory ERRO[0000] Error evaluating kustomization manifest for namespaces: accumulating resources: accumulating resources from '../../.cache/manifests/namespaces/base': open /home/supermap/openthings/kubeflow/.cache/manifests/namespaces/base: no such file or directory filename="kustomize/kustomize.go:155" Error: failed to apply: (kubeflow.error): Code 500 with message: kfApp Apply failed for kustomize: (kubeflow.error): Code 500 with message: error evaluating kustomization manifest for namespaces: accumulating resources: accumulating resources from '../../.cache/manifests/namespaces/base': open /home/supermap/openthings/kubeflow/.cache/manifests/namespaces/base: no such file or directory
-
查看.cache目录,发现manifest位于 ~/openthings/kubeflow/.cache/manifests/manifests-1.2.0 目录下,而不是上面的manifests目录。
-
将manifests-1.2.0下的所有文件移到上一级即manifest目录下,再次运行kfctl apply。如下:
cd manifests-1.2.0 mv -r * ../
-
但是运行kfctl apply发现会将.cache目录删除,导致上面的复制方法失效。
-
直接修改配置文件,修改所有自定义资源的路径,改完后的配置文件如下:
apiVersion: kfdef.apps.kubeflow.org/v1 kind: KfDef metadata: creationTimestamp: null namespace: kubeflow spec: applications: - kustomizeConfig: repoRef: name: manifests path: manifests-1.2.0/namespaces/base name: namespaces - kustomizeConfig: repoRef: name: manifests path: manifests-1.2.0/application/v3 name: application - kustomizeConfig: repoRef: name: manifests path: manifests-1.2.0/stacks/kubernetes/application/istio-1-3-1-stack name: istio-stack - kustomizeConfig: repoRef: name: manifests path: manifests-1.2.0/stacks/kubernetes/application/cluster-local-gateway-1-3-1 name: cluster-local-gateway - kustomizeConfig: repoRef: name: manifests path: manifests-1.2.0/istio/istio/base name: istio - kustomizeConfig: repoRef: name: manifests path: manifests-1.2.0/stacks/kubernetes/application/cert-manager-crds name: cert-manager-crds - kustomizeConfig: repoRef: name: manifests path: manifests-1.2.0/stacks/kubernetes/application/cert-manager-kube-system-resources name: cert-manager-kube-system-resources - kustomizeConfig: repoRef: name: manifests path: manifests-1.2.0/stacks/kubernetes/application/add-anonymous-user-filter name: add-anonymous-user-filter - kustomizeConfig: repoRef: name: manifests path: manifests-1.2.0/metacontroller/base name: metacontroller - kustomizeConfig: repoRef: name: manifests path: manifests-1.2.0/admission-webhook/bootstrap/overlays/application name: bootstrap - kustomizeConfig: repoRef: name: manifests path: manifests-1.2.0/stacks/kubernetes/application/spark-operator name: spark-operator - kustomizeConfig: repoRef: name: manifests path: manifests-1.2.0/stacks/kubernetes name: kubeflow-apps - kustomizeConfig: repoRef: name: manifests path: manifests-1.2.0/knative/installs/generic name: knative - kustomizeConfig: repoRef: name: manifests path: manifests-1.2.0/kfserving/installs/generic name: kfserving - kustomizeConfig: repoRef: name: manifests path: manifests-1.2.0/stacks/kubernetes/application/spartakus name: spartakus repos: - name: manifests uri: /home/supermap/openthings/kubeflow/v1.2.0.tar.gz version: v1.2-branch status: {}
-
删除kustomize目录,重新运行kfctl build和kfctl apply.
KubeFlow的镜像较多,完全启动需要比较长的时间,需要耐心等待。
过段时间看,有些pod已经启动起来了,主界面已经可以访问了。
查看状态,有些镜像和服务有问题,包括镜像下载、存储卷设置等,留待后续解决。
(base) supermap@xriver02:~$ kubectl get pod -n kubeflow NAME READY STATUS RESTARTS AGE admission-webhook-bootstrap-stateful-set-0 0/1 ImagePullBackOff 0 36h admission-webhook-deployment-5cd7dc96f5-l9rxl 1/1 Running 0 36h application-controller-stateful-set-0 0/1 ImagePullBackOff 0 36h argo-ui-657cf69ff5-kn966 1/1 Running 0 36h cache-deployer-deployment-5f4979f45-q6psq 1/2 ImagePullBackOff 0 36h cache-server-7859fd67f5-kx8zm 0/2 Init:0/1 0 36h centraldashboard-86744cbb7b-44rbc 1/1 Running 0 36h jupyter-web-app-deployment-8486d5ffff-9czzl 1/1 Running 0 36h katib-controller-7fcc95676b-tsbzx 1/1 Running 1 36h katib-db-manager-67867f5498-jzrgh 0/1 Running 442 36h katib-mysql-6b5d848bf5-gs95h 0/1 Pending 0 36h katib-ui-65dc4cf6f5-pqj5p 1/1 Running 0 36h kfserving-controller-manager-0 1/2 ImagePullBackOff 0 36h kubeflow-pipelines-profile-controller-797fb44db9-vznlv 1/1 Running 0 36h metacontroller-0 1/1 Running 0 36h metadata-db-c65f4bc75-m2ggv 0/1 Pending 0 36h metadata-envoy-deployment-67bd5954c-jl7pn 1/1 Running 0 36h metadata-grpc-deployment-577c67c96f-29dwx 0/1 CrashLoopBackOff 433 36h metadata-writer-756dbdd478-tlrpw 2/2 Running 325 36h minio-54d995c97b-jrmqq 0/1 Pending 0 36h ml-pipeline-8d6749d9c-drv2h 1/2 CrashLoopBackOff 662 36h ml-pipeline-persistenceagent-d984c9585-mhstn 2/2 Running 0 36h ml-pipeline-scheduledworkflow-5ccf4c9fcc-wqg4d 2/2 Running 0 36h ml-pipeline-ui-8ccbf585c-77krb 2/2 Running 0 36h ml-pipeline-viewer-crd-56c68f6c85-bssgc 1/2 ImagePullBackOff 0 36h ml-pipeline-visualizationserver-7446b96877-ffs7b 2/2 Running 0 36h mpi-operator-d5bfb8489-75m6b 1/1 Running 0 36h mxnet-operator-7576d697d6-jwks8 1/1 Running 0 36h mysql-74f8f99bc8-ndzqg 0/2 Pending 0 36h notebook-controller-deployment-dd4c74b47-k9fng 0/1 ImagePullBackOff 0 36h profiles-deployment-65f54cb5c4-9xtws 0/2 ImagePullBackOff 0 36h pytorch-operator-847c8d55d8-x6l4t 0/1 ImagePullBackOff 0 36h seldon-controller-manager-6bf8b45656-d7rvf 1/1 Running 0 36h spark-operatorsparkoperator-fdfbfd99-cst9l 0/1 ImagePullBackOff 0 36h spartakus-volunteer-558f8bfd47-tcvpn 1/1 Running 0 36h tf-job-operator-58477797f8-wr79t 1/1 Running 0 36h workflow-controller-64fd7cffc5-m6gkc 1/1 Running 0 36h
访问 Kubeflow 用户界面 (UI)
Kubeflow 部署完成后,Kubeflow Dashboard 的访问通过服务 istio-ingressgateway
来获取。loadbalancer在环境中不可用,NodePort 或 Port forwarding 可以用于访问 Kubeflow Dashboard,参考 Ingress Gateway guide 或者:
-
为私有Kubernetes集群创建LoadBalancer服务
-
Kubernetes dashboard 通过 Ingress 提供HTTPS访问
-
Kubernetes负载均衡器-Nginx ingress安装
删除 Kubeflow
运行下面的命令删除部署并回收资源:
cd ${KF_DIR}# If you want to delete all the resources, run:kfctl delete -f ${CONFIG_FILE}
理解部署过程
kfctl 部署过程包含下面几个命令:
-
kfctl build
– (可选) 创建配置文件,只在需要自行修改配置参数时才需要在kfctl apply之前运行
kfctl build
。 -
kfctl apply
– 创建或更新资源。 -
kfctl delete
– 删除资源。
应用的布局
您的 Kubeflow 应用目录 ${KF_DIR} 包含下面的文件和目录:
-
${CONFIG_FILE} 是一个 YAML 文件定义了kubeflow部署的参数:
-
该文件是 GitHub-based configuration YAML 文件的副本,位于: https://raw.githubusercontent.com/kubeflow/manifests/v1.0-branch/kfdef/kfctl_k8s_istio.v1.0.2.yaml,如果不能成功部署,需要先上github将其下载保存,然后修改URI指向到本地文件。
-
当运行
kfctl apply
或kfctl build
,kfctl 创建配置文件的本地副本${CONFIG_FILE}
, 然后可以对其编辑、客制化。 -
kustomize 是一个目录,包含 Kubeflow applications应用的定制化包。参考: how Kubeflow uses kustomize。
-
该目录在运行
kfctl build
或kfctl apply
时创建出来。 -
可以通过修改目录中的manifests来定制 Kubernetes resources ,然后重新运行
kfctl apply
进行部署和更新。
建议将${KF_DIR}
目录中的内容纳入版本管理系统。
Provisioning of Persistent Volumes in Kubernetes
如果已经有 dynamic volume provisioner,可以跳过本步骤
问题解决
Persistent Volume Claims 处于 Pending 状态
检查PersistentVolumeClaims 是否 Bound
到 PersistentVolumes,如下:
kubectl -n kubeflow get pvc
如果PersistentVolumeClaims (PVCs) 在 Pending
状态,部署后没有bound 到 PersistentVolumes (PVs),就需要手动为每一个PVC创建PV,或者安装 dynamic volume provisioning 来按需创建PVs ,以及删除存在的PVCs然后重新部署 Kubeflow。
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