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How to do JVM performance analysis in docker container?
Prerequisite Java application with docker based on JDK 8 and alpine. This app is a Jhipster application. Dockerfile:
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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
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#!/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" "$@" |
Precheck Enter container to check the process. Of course, we have only...
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...
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
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
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...
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...
Set statement timeout for query execution
How to set statement timeout for query execution? Prerequisites: sqlalchemy 1.3.19 MySQL 5.7.13 You can set the connection timeout easily like this:
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sqlalchemy.create_engine("mysql+pymysql://{}:{}@{}:{}/{}?charset={}", connect_args={'connect_timeout': 10}) //10 seconds |
Be careful, when you are using CrudReporsitory.save() in JPA
in some JPA project, CrudReporsitory.save() is used this way:
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repository.save(oldtEntity) |
sometime the oldEntity will be set with new properties, but sometimes you will find that the new assigned ID has not been set to...
The message is xxx bytes when serialized which is larger than the maximum request size you have configured with the max.request.size configuration.
org.apache.kafka.common.errors.RecordTooLargeException: The message is xxxx bytes when serialized which is larger than the maximum request size you have configured with the max.request.size configuration. How to fix this when you are using confluent Kafka docker....
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