The official Docker mariadb image will run all *.sh and *.sql scripts in its /docker-entrypoint-initdb.d directory automatically when it starts. Table of contents: 1. Create an init.sql 2. Run an init script for Docker MariaDB 3. Access the MariaDB running container 4. References Technologies used: Docker 24.0.5 Official Docker mariadb image (latest tag) 1. Create […]
This article shows how to use Docker to run MariaDB as a container. Tables of contents: 1. Run MariaDB as a container 2. Specify the MariaDB version 3. Access the running MariaDB container 4. MariaDB Persistent Storage with Volume 5. Access the MariaDB container log 6. Stop the MariaDB Container 7. Start the MariaDB Container […]
The official Docker postgres image will run all *.sh and *.sql scripts in its /docker-entrypoint-initdb.d directory automatically when it starts. Table of contents: 1. Create an init.sql 2. Copy init.sql to container 3. Start the Postgres container 4. Access the Postgres container 5. References Technologies used: Docker 24.0.5 Official Docker postgres image (latest) 1. Create […]
Learn how to run PostgreSQL as a Docker container using Docker Compose. This guide is perfect for developers who want a clean, isolated database environment for local development and testing.
This article shows how to test the Spring Boot REST endpoints using TestRestTemplate and Testcontainers (PostgreSQL container). Technologies used : Spring Boot 3.1.2 (Spring Web MVC, Spring Data JPA and Spring Test) Testcontainers 1.19.0 PostgreSQL 15, Alpine Linux base image postgres:15-alpine Java 17 JUnt 5 Tables of contents: 1. Project Structure 2. Project Dependencies 3. […]
This article shows how to create or scaffold a Gradle + Quarkus JAX-RS hello world project, which creates a /hello endpoint and returns a string. Technologies used: Quarkus 1.11.0 Gradle 6.7 Maven 3.6.3 Java 11 Topics Creating a new Gradle + Quartus project Gradle + Quarkus Project Structure Quarkus and build.gradle Quarkus Dependencies (runtimeClasspath) Quarkus […]
This article shows how to use the quarkus-maven-plugin to create or scaffold a Maven + Quarkus JAX-RS hello world project. Technologies used: Quarkus 1.11.0 Maven 3.6.3 Java 11 Topics Creating a new Maven + Quartus project Maven + Quarkus Project Structure Quarkus and pom.xml Quarkus Dependencies Quarkus JAX-RX endpoint Quarkus and Dockerfile Run Quarkus in […]
On Docker, –rm option means automatically remove the container when it exits. $ docker run –rm <container_id> Done 🙂 Please read on to understand more about –rm. 1. Remove a container On Docker, the container is an instance of an image, and we can create multiple containers from an image. If the container is exited […]
In Docker, we can use docker ps to show all running containers, docker ps -a to show all running and stopped containers. Here are some of the commonly used examples: Terminal # common $ docker ps // show only running containers $ docker ps -a // show all containers (running and stopped or exited) # […]
In Java 11, JEP 330 adds support to run single-file source code directly. Terminal # Before Java 11 $ javac Hello.java $ java Hello # Now Java 11 $ java Hello.java This indirectly supports the Java single-file program to run as a script using Unix Shebang. For example, run below .sh file will print Hello […]
docker run a container, but it displayed nothing, no output, no error? docker ps shows no running container? Terminal $ docker run -d -p 80:8080 -p 443:8443 -t markdownhtml:1.1 8eba06d44bf236109cf65b7b93842e9c898370cac1740aa2bab557a0fc8e52b9 $ docker ps CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES Solution Most of the time, the container hit an error and exited automatically. We […]
In this article, we will show you how to use docker cp to copy files or folders from a docker container to the host (local file system) or the reversed. For example, here is a running container, id is d362659da5fc, later we will copy files from and to this container. Terminal $ docker ps CONTAINER […]
Java Flight Recorder (JFR) is a Java profiling tool that used to monitor and diagnose a running Java application, it collects data about the running environment, JVM and Java application and dumps the recorded data into a .jfr file, and we can use Java Mission Control (JMC) to analyze and visualize the .jfr file. Tested […]
If bash shell is not working, try sh. Terminal $ docker ps CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES 3d1588519433 markdownhtml:0.1 "java -jar app.jar" About an hour ago Up About an hour 0.0.0.0:80->8080/tcp gracious_haibt $ docker exec -it 3d1588519433 bash OCI runtime exec failed: exec failed: container_linux.go:349: starting container process caused "exec: \"bash\": executable […]
The jcmd is available at the JDK/bin, not JRE. Make sure the installed Java is JDK, not JRE. Let review the following example, try to use jcmd to enable Java Flight Recorder inside a docker container. 1. DockerFile A simple Dokcerfile. Dockerfile FROM adoptopenjdk/openjdk11:alpine-jre ARG JAR_FILE=target/markdown.jar WORKDIR /opt/app COPY ${JAR_FILE} app.jar ENTRYPOINT ["java","-jar","app.jar"] 2. Docker […]
This article shows you how to use docker exec -it <container ID or Name> <sh or bash> to access or get into the container’s shell. Terminal # docker exec -it <contaier ID or name> <command> $ docker exec -it a5df11a07a0e bash /opt/app # $ docker exec -it stoic_bhaskara sh /opt/app # The docker exec -it […]
In Docker, we cannot remove a running container, stop it first. Stop all running containers. Terminal $ sudo docker stop $(sudo docker ps -aq) Remove all stopped containers. Terminal $ sudo docker rm $(sudo docker ps -aq) 1. Stop Container 1.1 List all containers sudo docker ps Terminal $ sudo docker ps CONTAINER ID IMAGE […]
In this tutorial, we will show you how to Dockerize a Spring Boot web application (mvc + thymeleaf). Tested with Docker 19.03 Ubuntu 19 Java 8 or Java 11 Spring Boot 2.2.4.RELEASE Maven At the end of the article, we will create a Spring Boot MVC web application and run inside a docker container. P.S […]
In this tutorial, we will show you how to Dockerize a Java Application (an executable Jar file). Tested with Docker 19.03 Ubuntu 19 Java 8 Maven At the end of the article, we will create an executable Jar file and run inside a docker container. 1. Project Directory 1.1 A standard Maven project structure. See […]
This article shows how to use Spring Web MVC to create REST endpoints for CRUD database operations using the Spring Data JPA and PostgreSQL. At the end of the tutorial, we will use Docker to start a PostgreSQL container to test the Spring Boot REST endpoints using curl commands. We will use Spring Test and […]
This article shows how to use Spring Web MVC to create REST endpoints to perform CRUD database operations using the Spring Data JPA and MySQL. At the end of the tutorial, we will use Docker to start a MySQL container to test the Spring Boot REST endpoints using curl commands. We will use Spring Test […]
