Prometheus监控Tomcat

原文：https://mp.weixin.qq.com/s/vFNFy3IyfpkJLUy9hISaVQ

（1）制作tomcat镜像，按如下步骤

mkdir /root/tomcat_image

把上面的war包和jar包传到这个目录下

cat Dockerfile

FROM tomcat
ADD 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/

docker build -t='xianchao/tomcat_prometheus:v1' .

 docker login

username：xianchao

password：1989317**

docker push xianchao/tomcat_prometheus:v1 

#上传镜像到hub仓库

docker pull xianchao/tomcat_prometheus:v1  

#在k8s的node节点拉取镜像

（2）基于上面的镜像创建一个tomcat实例

cat deploy.yaml

apiVersion: apps/v1
kind: Deployment
metadata:
  name: tomcat-deployment
  namespace: default
spec:
  selector: 
    matchLabels: 
     app: tomcat
  replicas: 2 # 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

kubectl apply -f deploy.yaml

 （3）创建一个service，可操作也可不操作

cat tomcat-service.yaml

kind: Service  #service 类型
apiVersion: v1
metadata:
#  annotations:
#    prometheus.io/scrape: 'true'
  name: tomcat-service
spec:
  selector:
    app: tomcat
  ports:
  - nodePort: 31360
    port: 80
    protocol: TCP
    targetPort: 8080
  type: NodePort

kubectl apply -f tomcat-service.yaml