Prometheus 与 OSM 集成

Prometheus 与 OSM 集成

To familiarize yourself on how OSM works with Prometheus, try installing a new mesh with sample applications to see which metrics are collected. 为了熟悉 OSM 如何与 Promethues 工作，试着安装网格和示例应用来看收集了哪些指标。

  1. 安装 OSM 并使用你自己的 Prometheus 实例：

    $ osm install --set osm.deployPrometheus=true,osm.enablePermissiveTrafficPolicy=true
OSM installed successfully in namespace [osm-system] with mesh name [osm]

  2. 为示例工作负载创建命名空间：

    $ kubectl create namespace metrics-demo
namespace/metrics-demo created

  3. 让 OSM 监控新创建的命名空间：

    $ osm namespace add metrics-demo
Namespace [metrics-demo] successfully added to mesh [osm]

  4. 配置 Prometheus 从新的命名空间获取指标：

    $ osm metrics enable --namespace metrics-demo
Metrics successfully enabled in namespace [metrics-demo]

  5. 安装示例应用：

    $ kubectl apply -f https://raw.githubusercontent.com/openservicemesh/osm-docs/release-v1.2/manifests/samples/curl/curl.yaml -n metrics-demo
serviceaccount/curl created
deployment.apps/curl created
$ kubectl apply -f https://raw.githubusercontent.com/openservicemesh/osm-docs/release-v1.2/manifests/samples/httpbin/httpbin.yaml -n metrics-demo
serviceaccount/httpbin created
service/httpbin created
deployment.apps/httpbin created

    确保所有的 pod 和容器已经启动并运行：

    $ kubectl get pods -n metrics-demo
NAME                       READY   STATUS    RESTARTS   AGE
curl-54ccc6954c-q8s89      2/2     Running   0          95s
httpbin-8484bfdd46-vq98x   2/2     Running   0          72s

  6. 生成流量：

    下面的命令让 curl Pod 来不停地以每秒 1 个请求的速度访问 httpbin Pod。

    $ kubectl exec -n metrics-demo -ti "$(kubectl get pod -n metrics-demo -l app=curl -o jsonpath='{.items[0].metadata.name}')" -c curl -- sh -c 'while :; do curl -i httpbin.metrics-demo:14001/status/200; sleep 1; done'
HTTP/1.1 200 OK
server: envoy
date: Tue, 23 Mar 2021 17:27:44 GMT
content-type: text/html; charset=utf-8
access-control-allow-origin: *
access-control-allow-credentials: true
content-length: 0
x-envoy-upstream-service-time: 1

HTTP/1.1 200 OK
server: envoy
date: Tue, 23 Mar 2021 17:27:45 GMT
content-type: text/html; charset=utf-8
access-control-allow-origin: *
access-control-allow-credentials: true
content-length: 0
x-envoy-upstream-service-time: 2

...

  7. 在 Prometheus 中查看指标：

    转发 Prometheus 端口：

    $ kubectl port-forward -n osm-system $(kubectl get pods -n osm-system -l app=osm-prometheus -o jsonpath='{.items[0].metadata.name}') 7070
Forwarding from 127.0.0.1:7070 -> 7070
Forwarding from [::1]:7070 -> 7070

    在浏览器中访问 http://localhost:7070 查看 Prometheus 用户界面。下面的查询会显示 curl pod 每秒发送多少请求到 httpbin pod，应该是 1:

    irate(envoy_cluster_upstream_rq_xx{source_service="curl", envoy_cluster_name="metrics-demo/httpbin"}[30s])

    在 Prometheus 用户界面中可随意访问其他的指标。

  8. 清理

    一旦演示资源使用完，通过删除应用命名空间来清理：

    $ kubectl delete ns metrics-demo
namespace "metrics-demo" deleted

    然后，卸载 OSM：

    $ osm uninstall mesh
Uninstall OSM [mesh name: osm] ? [y/n]: y
OSM [mesh name: osm] uninstalled

    在卸载 OSM 后删除集群范围的资源，执行下面的命令。参阅 卸载指南 获取更多信息。

    $ osm uninstall mesh --delete-cluster-wide-resources