Mobabel

Mobabel Blog

November 10, 2022

API Call always get 400 Bad Request response after upgrading Spring Boot to 2.7.x

In the past few weeks, my team met a critical issue. Our service ABC just upgraded the spring boot version from 2.2.x to 2.7.x. After testing and deployment to the production environment, we found...

Hibernate Oracle sessions not be closed correctly

Ohters

March 27, 2022

Hibernate Oracle sessions not be closed correctly

We got escalation today, a lot of services are very slow or stop working. Our Oracle database(10g) admin has found that there are a huge number of unclosed sessions in the Oracle database. In...

Increase the building heap-size for Jenkins jobs

DevOps Practice

March 1, 2022

Increase the building heap-size for Jenkins jobs

In Jenkins configuration the following configs have been set: Maven Project Configuration->Global MAVEN_OPTS

-Xmx8192m -XX:MaxPermSize=1024m

1	-Xmx8192m -XX:MaxPermSize=1024m

Global properties->Environment variables

Name:
MAVEN_OPTS
Value:
-Xmx8192m -XX:MaxPermSize=1024m -Djava.io.tmpdir=/clusters/shared_workspace/tmp

Name:

MAVEN_OPTS

Value:

-Xmx8192m -XX:MaxPermSize=1024m -Djava.io.tmpdir=/clusters/shared_workspace/tmp

DevOps Practice

February 25, 2022

Jenkins pipeline to create and trigger jobs dynamically inside a loop

There is a requirement from the customer, to build a pipeline, which will be executed to call 100 remote entry points. Of course, we have a classic approach to do this:

     stage('aa_11'){
         steps{
             build job: 'Tasks/pipeline_to_call_remote_api',
             wait: true,
             parameters: [
                 string(name: 'PARAM1', value: 'aa'),
                 string(name: 'PARAM2', value: '11')
             ]
         }
     }

     stage('aa_22'){
         steps{
             build job: 'Tasks/pipeline_to_call_remote_api',
             wait: true,
             parameters: [
                 string(name: 'PARAM1', value: 'aa'),
                 string(name: 'PARAM2', value: '22')
             ]
         }
     }
.......

stage('aa_11'){

steps{

build job: 'Tasks/pipeline_to_call_remote_api',

wait: true,

parameters: [

string(name: 'PARAM1', value: 'aa'),

string(name: 'PARAM2', value: '11')

]

}

stage('aa_22'){

steps{

build job: 'Tasks/pipeline_to_call_remote_api',

wait: true,

parameters: [

string(name: 'PARAM1', value: 'aa'),

string(name: 'PARAM2', value: '22')

]

}

.......

January 5, 2022

Liveness and Readiness Probes with Spring Boot – for k8s

In Kubernetes, the Liveness and Readiness Kubernetes concepts represent facets of the application state. The Liveness state of an application tells whether the internal state is valid. If Liveness is broken, this means that the application...

How to do JVM performance analysis in docker container?

Performance Benchmark

May 22, 2021

How to do JVM performance analysis in docker container?

1. Prerequisite Java application with docker based on JDK 8 and alpine. This app is a Jhipster application. Dockerfile:

FROM openjdk:8-jre-alpine

ENV SPRING_OUTPUT_ANSI_ENABLED=ALWAYS \
    JHIPSTER_SLEEP=0 \
    JAVA_OPTS=""

# Add a jhipster user to run our application so that it doesn't need to run as root
RUN adduser -D -s /bin/sh jhipster
WORKDIR /home/jhipster

ADD entrypoint.sh entrypoint.sh
RUN chmod 755 entrypoint.sh && chown jhipster:jhipster entrypoint.sh
USER jhipster

ENTRYPOINT ["./entrypoint.sh"]

EXPOSE 18082 5701/udp

ADD *.jar app.jar

FROM openjdk:8-jre-alpine

ENV SPRING_OUTPUT_ANSI_ENABLED=ALWAYS \

JHIPSTER_SLEEP=0 \

JAVA_OPTS=""

# Add a jhipster user to run our application so that it doesn't need to run as root

RUN adduser -D -s /bin/sh jhipster

WORKDIR /home/jhipster

ADD entrypoint.sh entrypoint.sh

RUN chmod 755 entrypoint.sh && chown jhipster:jhipster entrypoint.sh

USER jhipster

ENTRYPOINT ["./entrypoint.sh"]

EXPOSE 18082 5701/udp

ADD *.jar app.jar

entrypoint.sh

#!/bin/sh

echo "The application will start in ${JHIPSTER_SLEEP}s..." && sleep ${JHIPSTER_SLEEP}
exec java ${JAVA_OPTS} -Djava.security.egd=file:/dev/./urandom -Xdebug -Xrunjdwp:server=y,transport=dt_socket,address=5005,suspend=n -jar "${HOME}/app.jar" "$@"

#!/bin/sh

echo "The application will start in ${JHIPSTER_SLEEP}s..." && sleep ${JHIPSTER_SLEEP}

exec java ${JAVA_OPTS} -Djava.security.egd=file:/dev/./urandom -Xdebug -Xrunjdwp:server=y,transport=dt_socket,address=5005,suspend=n -jar "${HOME}/app.jar" "$@"

2. Precheck Enter container to check the process. Of course, we...

Hibernate second-level cache stops all database operation

Performance Diagnosing

May 7, 2021

Hibernate second-level cache stops all database operation

The customer reported today that one of our services stopped working, the new coming data can not be saved into the database. After checking the logs, there are a lot of “Hazelcast instance is...

DevOps Practice

April 18, 2021

Memory/CPU limit in Docker Swarm

Running 1,000 Containers in Docker Swarm How to Limit Resources for Docker Swarm Services https://docs.docker.com/config/containers/resource_constraints/ What does –oom-kill-disable do for a Docker container? Unable to use oom-kill-disable configuration Docker Container Resource Management: CPU, RAM...

Getting data from docker MySQL database with Jenkins pipeline and send Email as attachment

DevOps Practice

March 15, 2021

Getting data from docker MySQL database with Jenkins pipeline and send Email as attachment

In this post, a simple daily data report for one microservice will be created using the Jenkins pipeline. Prerequisites: Publish Over SSH Mattermost Notification Plugin Groovy Postbuild Jenkins

DevOps Practice

March 1, 2021

Use multiple JDKs in one Jenkinsfile

As usual, the Jenkins pipeline will only use the default JDK to execute the task. How to use multiple JDKs in one Jenkinsfile for different stages? First, define the multiple JDKs in Jenkins “Global...

Log Aggregation

November 16, 2020

Disable Logback log files in containers

We found the spring boot project running containers will keep restarting after some time, maybe 10 days, maybe 5 days. The root cause is spring logback is writing log files into /tmp/ directory as...

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Mobabel

Mobabel Blog

API Call always get 400 Bad Request response after upgrading Spring Boot to 2.7.x

Hibernate Oracle sessions not be closed correctly

Increase the building heap-size for Jenkins jobs

Jenkins pipeline to create and trigger jobs dynamically inside a loop

Liveness and Readiness Probes with Spring Boot – for k8s

How to do JVM performance analysis in docker container?

Hibernate second-level cache stops all database operation

Memory/CPU limit in Docker Swarm

Getting data from docker MySQL database with Jenkins pipeline and send Email as attachment

Use multiple JDKs in one Jenkinsfile

Disable Logback log files in containers

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