{"id":88897,"date":"2019-02-26T10:00:11","date_gmt":"2019-02-26T08:00:11","guid":{"rendered":"https:\/\/www.javacodegeeks.com\/?p=88897"},"modified":"2019-02-25T12:40:36","modified_gmt":"2019-02-25T10:40:36","slug":"monitor-prometheus-kubernetes","status":"publish","type":"post","link":"https:\/\/www.javacodegeeks.com\/2019\/02\/monitor-prometheus-kubernetes.html","title":{"rendered":"Monitor applications using Prometheus Operator on Kubernetes"},"content":{"rendered":"

You can make the Prometheus configuration aware of the Kubernetes environment your applications are running in. I\u2019ve described how to do that manually, in a previous blog post<\/a>. Prometheus Operator<\/a> is an extension to Kubernetes that manages Prometheus monitoring instances in a more automated and effective way.<\/p>\n

Prometheus Operator allows you to define and manage monitoring instances as Kubernetes resources. If you know how to manage Kubernetes, there\u2019s a low threshold to get started and effectively define the monitoring of your applications.<\/p>\n

In order to enable our Kubernetes for Prometheus operators, we setup the resource and RBAC definitions that you can find here<\/a>. This enhances our cluster with more Kubernetes resources types, such as ServiceMonitor<\/code>, or Prometheus<\/code>. Similarly, you can use the Prometheus Operator helm chart<\/a>.<\/p>\n

We define the operators of our config-example<\/code> application, similar to the previous post:<\/p>\n

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apiVersion: monitoring.coreos.com\/v1<\/code><\/div>\n
kind: ServiceMonitor<\/code><\/div>\n
metadata:<\/code><\/div>\n
  <\/code>name: config-example<\/code><\/div>\n
  <\/code>labels:<\/code><\/div>\n
    <\/code>team: example<\/code><\/div>\n
spec:<\/code><\/div>\n
  <\/code>selector:<\/code><\/div>\n
    <\/code>matchLabels:<\/code><\/div>\n
      <\/code>app: config-example<\/code><\/div>\n
  <\/code>endpoints:<\/code><\/div>\n
  <\/code>- basicAuth:<\/code><\/div>\n
      <\/code>password:<\/code><\/div>\n
        <\/code>name: basic-auth<\/code><\/div>\n
        <\/code>key: password<\/code><\/div>\n
      <\/code>username:<\/code><\/div>\n
        <\/code>name: basic-auth<\/code><\/div>\n
        <\/code>key: username<\/code><\/div>\n
    <\/code>port: https<\/code><\/div>\n
    <\/code>scheme: https<\/code><\/div>\n
    <\/code>path: <\/code>'\/metrics\/'<\/code><\/div>\n
    <\/code>tlsConfig:<\/code><\/div>\n
      <\/code>insecureSkipVerify: <\/code>true<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n
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apiVersion: monitoring.coreos.com\/v1<\/code><\/div>\n
kind: Prometheus<\/code><\/div>\n
metadata:<\/code><\/div>\n
  <\/code>name: prometheus<\/code><\/div>\n
spec:<\/code><\/div>\n
  <\/code>serviceAccountName: prometheus<\/code><\/div>\n
  <\/code>serviceMonitorSelector:<\/code><\/div>\n
    <\/code>matchLabels:<\/code><\/div>\n
      <\/code>team: example<\/code><\/div>\n
  <\/code>resources:<\/code><\/div>\n
    <\/code>requests:<\/code><\/div>\n
      <\/code>memory: 400Mi<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n
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apiVersion: v1<\/code><\/div>\n
kind: Service<\/code><\/div>\n
metadata:<\/code><\/div>\n
  <\/code>name: prometheus<\/code><\/div>\n
spec:<\/code><\/div>\n
  <\/code>ports:<\/code><\/div>\n
  <\/code>- port: <\/code>9090<\/code><\/div>\n
    <\/code>name: http<\/code><\/div>\n
  <\/code>selector:<\/code><\/div>\n
    <\/code>prometheus: prometheus<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n
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apiVersion: v1<\/code><\/div>\n
kind: Secret<\/code><\/div>\n
metadata:<\/code><\/div>\n
  <\/code>name: basic-auth<\/code><\/div>\n
data:<\/code><\/div>\n
  <\/code>password: YWRtaW5hZG1pbg==<\/code><\/div>\n
  <\/code>username: YWRtaW4=<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

This sets up a prometheus instance, that will scrape applications that are deployed with the app: config-example<\/code> label using the provided configuration to access it. It also creates a prometheus<\/code> service to access the monitoring instances.

<\/div> <\/div><\/p>\n

You can find a full description of the Prometheus Operator API in the documentation<\/a>.<\/p>\n

After we applied all resources, we can see the running monitoring instances in our cluster:<\/p>\n

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gt; kubectl get pods NAME READY STATUS RESTARTS AGE config-example-7db586bb95-jdmsx <\/code>1<\/code>\/<\/code>1<\/code> Running <\/code>0<\/code> 12m config-example-7db586bb95-z4ln8 <\/code>1<\/code>\/<\/code>1<\/code> Running <\/code>0<\/code> 12m [...] prometheus-prometheus-<\/code>0<\/code> 3<\/code>\/<\/code>3<\/code> Running <\/code>0<\/code> 14m<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

This enables us to simply monitor all application instances without manually configuring the Prometheus instances.<\/p>\n

Have a look at the full example on GitHub<\/a> (deployment\/<\/code> directory).<\/p>\n

Found the post useful? Subscribe to my newsletter for more free content, tips and tricks on IT & Java:<\/p>\n

Success! Now check your email to confirm your subscription.<\/p>\n

\u00a9 Sebastian Daschner, CC BY-NC-SA 4.0<\/p>\n

\n\n\n\n
\n

Published on Java Code Geeks with permission by Sebastian Daschner, partner at our JCG program<\/a>. See the original article here: Monitor applications using Prometheus Operator on Kubernetes<\/a><\/p>\n

Opinions expressed by Java Code Geeks contributors are their own.<\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

You can make the Prometheus configuration aware of the Kubernetes environment your applications are running in. I\u2019ve described how to do that manually, in a previous blog post. Prometheus Operator is an extension to Kubernetes that manages Prometheus monitoring instances in a more automated and effective way. Prometheus Operator allows you to define and manage …<\/p>\n","protected":false},"author":7568,"featured_media":112,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[8],"tags":[1064,1857],"class_list":["post-88897","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-enterprise-java","tag-kubernetes","tag-prometheus"],"yoast_head":"\nMonitor applications using Prometheus Operator on Kubernetes - Java Code Geeks<\/title>\n<meta name=\"description\" content=\"Interested to learn about Prometheus Operator? 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