查看命名空间列表：

命名空间 keda 一直处于Terminating 状态

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kubectl get ns

NAME               STATUS        AGE
default            Active        87d
dev                Active        21d
ingress-nginx      Active        126m
keda               Terminating   126m
kube-flannel       Active        87d
kube-node-lease    Active        87d
kube-public        Active        87d
kube-system        Active        87d
openfaas           Active        87d
openfaas-fn        Active        87d
openfunction       Active        28h
tekton-pipelines   Active        126m

解决办法

将无法删除命名空间的json格式配置文件导出：

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kubectl get ns keda -o json > keda.json

编辑json配置文件的"spec"配置，将"finalizers"清空：

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"spec": {
    "finalizers": [
    ]
},

根据修改后的json配置replace掉原来的ns配置：

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kubectl replace --raw "/api/v1/namespaces/keda/finalize" -f ./keda.json

再度查看：

已成功删除

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kubectl get ns

NAME               STATUS   AGE
default            Active   87d
dev                Active   21d
ingress-nginx      Active   144m
kube-flannel       Active   87d
kube-node-lease    Active   87d
kube-public        Active   87d
kube-system        Active   87d
openfaas           Active   87d
openfaas-fn        Active   87d
openfunction       Active   28h
tekton-pipelines   Active   144m