Viewing and working with logs generated by your application

• Viewing and working with logs generated by your application
  • Prerequisite
  • Review Application Code Logging
  • Monitor Container Log with Developer Console
  • Monitor Container Log with EFK Stack in Openshift
  • Next Step

Prerequisite

• Complete Deploy application to openshift with s2i
• Go to your project (same as your username)
• Open Web Terminal by click '>_' on top of OpenShift Web Console
• use web terminal to run command line

Review Application Code Logging

• Example code with logging (Quarkus Framework)
  • Code URL: https://raw.githubusercontent.com/chatapazar/openshift-workshop/main/src/main/java/org/acme/getting/started/BackendResource.java
  • Example Code Logging

    import org.jboss.logging.Logger;
    ...
    private static final Logger logger = Logger.getLogger(BackendResource.class);
    ...
     URL url;
            try {
                logger.info("Request to: " + backend);
    ...
    

• example log property (Quarkus Framework)
  • Properties URL: https://raw.githubusercontent.com/chatapazar/openshift-workshop/main/src/main/resources/application.properties
  • Example properties:

    #Logging
    quarkus.log.level=INFO
    # quarkus.log.category."com.example.quarkus".level=INFO
    # quarkus.log.category."com.example.quarkus.health".level=DEBUG
    quarkus.log.console.enable=true
    quarkus.log.console.format=%d{HH:mm:ss} %-5p [%c{2.}] (%t) %s%e%n
    quarkus.log.console.color=false
    %dev.quarkus.log.console.color=true
    

Monitor Container Log with Developer Console

• go to web terminal
• test call backend service

  BACKEND_URL=https://$(oc get route backend -o jsonpath='{.spec.host}')
  curl $BACKEND_URL/backend
  

• view log in pod, go to Topology, click Duke icon (backend), in backend deployment select Resources Tab, click 'View logs' of Pod
• in pod details, select Logs tab to view log of container 'backend'
• re call backend service and check log in pod append (retry call 2-3 times for view logs append)

    BACKEND_URL=https://$(oc get route backend -o jsonpath='{.spec.host}')
    curl $BACKEND_URL/backend
  

  check log append at log terminal
• click raw icon to view log in another browser tab
• click download to download currnet log

Monitor Container Log with EFK Stack in Openshift

• From Logs tab in Pod details, click show in Kibana icon to open kibana in new tab
• Optional: for firstime, openshift will request you re-login and allow authorized to kibana (with oauth), click allow selected permissions
• Openshift will Open Kibana from EFK Stack, default page is Discover and auto add filter with pod name, namespace/project and container name
• Developer can custom filter to view log.
• For monitor more than 1 pod, developer can access kibana from logging menu on top of Developer Console (near web terminal menu icon)
• with this link, developer can custom filter to view log.

Next Step

• Basic Container Storage