背景
在 Kubernetes 上，从部署 Deployment 到失常提供服务，整个流程可能会呈现各种各样问题，有趣味的能够浏览 Kubernetes Deployment 的故障排查可视化指南（2021 中文版）。从可视化指南也可能看出这些问题实际上都是有迹可循，依据错误信息根本很容易找到解决办法。随着 ChatGPT 的风行，基于 LLM 的文本生成我的项目不断涌现，k8sgpt 便是其中之一。
k8sgpt 是一个扫描 Kubernetes 集群、诊断和分类问题的工具。它将 SRE 教训编入其分析器，并通过 AI 帮忙提取并丰盛相干的信息。
其内置了大量的分析器：
- podAnalyzer
- pvcAnalyzer
- rsAnalyzer
- serviceAnalyzer
- eventAnalyzer
- ingressAnalyzer
- statefulSetAnalyzer
- deploymentAnalyzer
- cronJobAnalyzer
- nodeAnalyzer
- hpaAnalyzer（可选）
- pdbAnalyzer（可选）
- networkPolicyAnalyzer（可选）
k8sgpt 的能力是通过 CLI 来提供的，通过 CLI 能够对集群中的谬误进行疾速的诊断。
k8sgpt analyze --explain --filter=Pod --namespace=default --output=json{ "status": "ProblemDetected", "problems": 1, "results": [ { "kind": "Pod", "name": "default/test", "error": [ { "Text": "Back-off pulling image \"flomesh/pipy2\"", "Sensitive": [] } ], "details": "The Kubernetes system is experiencing difficulty pulling the requested image named \"flomesh/pipy2\". \n\nThe solution may be to check that the image is correctly spelled or to verify that it exists in the specified container registry. Additionally, ensure that the networking infrastructure that connects the container registry and Kubernetes system is working properly. Finally, check if there are any access restrictions or credentials required to pull the image and ensure they are provided correctly.", "parentObject": "test" } ]}然而，每次进行诊断都要执行命令，有点繁琐且限度较多。我想大家想要的必定是可能监控到问题并主动诊断。这就有了明天要介绍的 k8sgpt-operator
介绍
简略来说 k8sgpt-operator 能够在集群中开启自动化的 k8sgpt。它提供了两个 CRD： K8sGPT 和 Result。前者能够用来设置 k8sgpt 及其行为；而后者则是用来展现问题资源的诊断后果。
apiVersion: core.k8sgpt.ai/v1alpha1kind: K8sGPTmetadata: name: k8sgpt-sample namespace: kube-systemspec: model: gpt-3.5-turbo backend: openai noCache: false version: v0.2.7 enableAI: true secret: name: k8sgpt-sample-secret key: openai-api-key演示
试验环境应用 k3s 集群。
export INSTALL_K3S_VERSION=v1.23.8+k3s2curl -sfL https://get.k3s.io | sh -s - --disable traefik --disable local-storage --disable servicelb --write-kubeconfig-mode 644 --write-kubeconfig ~/.kube/config装置 k8sgpt-operator
helm repo add k8sgpt https://charts.k8sgpt.ai/helm repo updatehelm install release k8sgpt/k8sgpt-operator -n openai --create-namespace装置实现后，能够看到随 operator 装置的两个 CRD：k8sgpts 和 results。
kubectl api-resources | grep -i gptk8sgpts core.k8sgpt.ai/v1alpha1 true K8sGPTresults core.k8sgpt.ai/v1alpha1 true Result在开始之前，须要学生成一个 OpenAI 的 key，并保留到 secret 中。
OPENAI_TOKEN=xxxxkubectl create secret generic k8sgpt-sample-secret --from-literal=openai-api-key=$OPENAI_TOKEN -n openai接下来创立 K8sGPT 资源。
kubectl apply -n openai -f - << EOFapiVersion: core.k8sgpt.ai/v1alpha1kind: K8sGPTmetadata: name: k8sgpt-samplespec: model: gpt-3.5-turbo backend: openai noCache: false version: v0.2.7 enableAI: true secret: name: k8sgpt-sample-secret key: openai-api-keyEOF执行完下面的命令后在 openai 命名空间下会主动创立 Deployment k8sgpt-deployment 。
测试
应用一个不存在的镜像创立 pod。
kubectl run test --image flomesh/pipy2 -n default而后在 openai 命名空间下会看到一个名为 defaulttest 的资源。
kubectl get result -n openaiNAME AGEdefaulttest 5m7s详细信息中能够看到诊断内容以及呈现问题的资源。
kubectl get result -n openai defaulttest -o yamlapiVersion: core.k8sgpt.ai/v1alpha1kind: Resultmetadata: creationTimestamp: "2023-05-02T09:00:32Z" generation: 1 name: defaulttest namespace: openai resourceVersion: "1466" uid: 2ee27c26-61c1-4ef5-ae27-e1301a40cd56spec: details: "The error message is indicating that Kubernetes is having trouble pulling the image \"flomesh/pipy2\" and is therefore backing off from trying to do so. \n\nThe solution to this issue would be to check that the image exists and that the spelling and syntax of the image name is correct. Additionally, check that the image is accessible from the Kubernetes cluster and that any required authentication or authorization is in place. If the issue persists, it may be necessary to troubleshoot the network connectivity between the Kubernetes cluster and the image repository." error: - text: Back-off pulling image "flomesh/pipy2" kind: Pod name: default/test parentObject: test关注"云原生指北"公众号
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