Prometheus 基于pod服务发现监控tomcat

Prometheus 基于pod服务发现监控tomcat

构建镜像

默认tomcat镜像不提供普罗米修斯相关的支持，所以需要自己制作镜像。

在tomcat发布目录下需要有一个metrics.war，这样接口地址才能暴露tomcat的一些指标，以及采集指标的tomcat_exporter_client-0.0.12.jar

[root@master tomcat]# cat Dockerfile FROM tomcatADD metrics.war /usr/local/tomcat/webapps/ADD simpleclient-0.8.0.jar  /usr/local/tomcat/lib/ADD simpleclient_common-0.8.0.jar /usr/local/tomcat/lib/ADD simpleclient_hotspot-0.8.0.jar /usr/local/tomcat/lib/ADD simpleclient_servlet-0.8.0.jar /usr/local/tomcat/lib/ADD tomcat_exporter_client-0.0.12.jar /usr/local/tomcat/lib/[root@master tomcat]# docker build -t 'tomcat_prometheus:v1' .Sending build context to Docker daemon    128kBStep 1/7 : FROM tomcatlatest: Pulling from library/tomcat5e0b432e8ba9: Pull complete a84cfd68b5ce: Pull complete e8b8f2315954: Pull complete Digest: sha256:429d5c140820d5eba38042823501d5f4e0f03b282133513e29c22d6358daa7c7Status: Downloaded newer image for tomcat:latest ---> 24207ccc9cceStep 2/7 : ADD metrics.war /usr/local/tomcat/webapps/ ---> 65f67a4763eaStep 3/7 : ADD simpleclient-0.8.0.jar  /usr/local/tomcat/lib/ ---> 72d7414ff158Step 4/7 : ADD simpleclient_common-0.8.0.jar /usr/local/tomcat/lib/ ---> 8e58e81f047fStep 5/7 : ADD simpleclient_hotspot-0.8.0.jar /usr/local/tomcat/lib/ ---> 2324ee685ac8Step 6/7 : ADD simpleclient_servlet-0.8.0.jar /usr/local/tomcat/lib/ ---> deb785fb6740Step 7/7 : ADD tomcat_exporter_client-0.0.12.jar /usr/local/tomcat/lib/ ---> 92539e485933Successfully built 92539e485933Successfully tagged tomcat_prometheus:v1

放在公有仓库上面了。

docker pull xianchao/tomcat_prometheus:v1 #在k8s的node节点拉取镜像拉取镜像

基于上面的镜像创建一个tomcat实例

pod里面这个字段也就是说我们创建的pod可以被Prometheus抓取到。

annotations:        prometheus.io/scrape: 'true'

[root@master tomcat]# cat deploy.yaml apiVersion: apps/v1kind: Deploymentmetadata:  name: tomcat-deployment  namespace: monitorspec:  selector:     matchLabels:      app: tomcat  replicas: 1 # tells deployment to run 2 pods matching the template  template: # create pods using pod definition in this template    metadata:      labels:        app: tomcat      annotations:        prometheus.io/scrape: 'true'    spec:      containers:      - name: tomcat        image: xianchao/tomcat_prometheus:v1        ports:        - containerPort: 8080        securityContext:           privileged: true

[root@master prometheus]# kubectl get pod -n monitor -o wideNAME                                 READY   STATUS    RESTARTS   AGE   IP              NODE     NOMINATED NODE   READINESS GATESgrafana-757fcd5f7c-n6sj7             1/1     Running   19         26d   10.233.96.236   node2node-exporter-26849                  1/1     Running   21         36d   192.168.100.5   masternode-exporter-jbbcq                  1/1     Running   23         36d   192.168.100.6   node1node-exporter-mh78s                  1/1     Running   21         36d   192.168.100.7   node2prometheus-server-5775f99578-6pxsj   1/1     Running   0          89s   10.233.90.131   node1tomcat-deployment-699d65b574-6zzcn   1/1     Running   0          10m   10.233.96.242   node2

我们可以看到 kubernetes-pods下面出现了很多实例，这是因为这里我们使用的是 pod 类型的服务发现，那么我们应该怎样来过滤出这个pod来呢？

keep，就是只把符合我们要求的给保留下来，哪些才是符合我们要求的呢？

我们可以把鼠标放置在任意一个 target 上，可以查看到Before relabeling里面所有的元数据

- job_name: 'kubernetes-pods-tomcat'      kubernetes_sd_configs:      - role: pod      relabel_configs:      - source_labels: [__meta_kubernetes_namespace,__meta_kubernetes_pod_label_app]        action: keep        regex: monitor;tomcat

可以看到最后被监控上了。 指标如下

[root@master prometheus]# curl HELP jvm_classes_loaded The number of classes that are currently loaded in the JVM# TYPE jvm_classes_loaded gaugejvm_classes_loaded 2760.0# HELP jvm_classes_loaded_total The total number of classes that have been loaded since the JVM has started execution# TYPE jvm_classes_loaded_total counterjvm_classes_loaded_total 2760.0# HELP jvm_classes_unloaded_total The total number of classes that have been unloaded since the JVM has started execution# TYPE jvm_classes_unloaded_total counterjvm_classes_unloaded_total 0.0# HELP process_cpu_seconds_total Total user and system CPU time spent in seconds.# TYPE process_cpu_seconds_total counterprocess_cpu_seconds_total 7.53# HELP process_start_time_seconds Start time of the process since unix epoch in seconds.# TYPE process_start_time_seconds gaugeprocess_start_time_seconds 1.639707011452E9

最后这个通过访问物理机ip和端口访问tomcat界面service可以创建也可以不创建。

cat tomcat-service.yamlkind: Service  #service 类型apiVersion: v1metadata:#  annotations:#    prometheus.io/scrape: 'true'  name: tomcat-servicespec:  selector:    app: tomcat  ports:  - nodePort: 31360    port: 80    protocol: TCP    targetPort: 8080  type: NodePort

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