03-Solution-Application-Failure.md

Practice Test - Application Failure

• Take me to Practice Test of the Application Failure

  Solution

  1. Check Solution

      kubectl delete svc mysql -n alpha
     

      apiVersion: v1
      kind: Service
      metadata:
        name: mysql-service
        namespace: alpha
      spec:
        ports:
        - port: 3306
          protocol: TCP
          targetPort: 3306
        selector:
          name: mysql
        sessionAffinity: None
        type: ClusterIP
      status:
        loadBalancer: {}
     

  2. Check Solution

     You can edit the mysql-service service and change the targetPort "8080" to "3306".

     kubectl edit svc mysql-service -n beta
     

     OR

     Delete the mysql-service service and then apply below manifest:

     kubectl delete svc mysql-service -n beta
     

     apiVersion: v1
     kind: Service
     metadata:
       name: mysql-service
       namespace: beta
     spec:
       ports:
       - port: 3306
         protocol: TCP
         targetPort: 3306
       selector:
         name: mysql
       sessionAffinity: None
       type: ClusterIP
     status:
       loadBalancer: {}
     

  3. Check Solution

     kubectl edit svc mysql-service -n gamma
     Press Esc, then colon(:)
     :%s/sql00001/mysql/
     

  4. Check Solution

     kubectl edit deployment.apps/webapp-mysql -n delta
     
     Change the DB_User's value to root.
     
     :%s/sql-user/root
     
     - name: DB_User
       value: root
     

  5. Check Solution

     kubectl edit pod mysql -n epsilon
     
     Replace the DB_Password with the correct password as shown below, then delete the pod and re-create it again.
     
     :%s/passwooooorrddd/paswrd
     
     save the file with ":wq" in vi editor and it will create a temporary file with random name under the default path /tmp/kubectl-edit-xxxxx.yaml. After deleting the existing one, re-create it again with kubectl apply -f or kubectl create -f command.
     
     In the "webapp-mysql" deployments, change the DB_User's value to root.
     
     kubectl edit deployment.apps/webapp-mysql -n epsilon
     
     :%s/sql-user/root
     
     - name: DB_User
       value: root
       
     save the file and exit with ":wq" in vi editor. 
     

  6. Check Solution

     kubectl edit deployment.apps/webapp-mysql -n zeta
     
     Change the DB_User's value to root.
     
     :%s/sql-user/root
     
     - name: DB_User
       value: root
     

     Replace the DB_Password with the correct password as shown below, delete the pod and re-create it.
     
     kubectl edit pod mysql -n zeta
     
     :%s/passwooooorrddd/paswrd
     
     save the file with ":wq" in vi editor and it will create a temporary file with random name under the default path /tmp/kubectl-edit-xxxxx.yaml. After deleting the existing one, re-create it again with kubectl apply -f or kubectl create -f command. 
     

     kubectl edit svc web-service -n zeta
     
     Change the nodePort from "30088" to "30081".
     
     :%s/30088/30081