docker-maven-plugin This is a Maven plugin for building Docker images and managing containers for integration tests. It works with Maven 3.0.5 and Docker 1.6.0 or later.
What is the best Maven plugin for Docker images?
A Maven plugin for building and pushing Docker images. We recommend you use dockerfile-maven instead. This plugin was the initial Maven plugin used at Spotify for building Docker images out of Java services. It was initially created in 2014 when we first began experimenting with Docker.
What is Docker-Maven-plugin?
docker-maven-plugin This is a Maven plugin for building Docker images and managing containers for integration tests. It works with Maven 3.0.5 and Docker 1.6.0 or later.
Is it possible to call a native Docker executable from Maven?
I have seen at least two companies that instead of using a dedicated Docker plugin, are just calling the native Docker executable via the maven exec plugin. This means that the Docker version that is injected in the Maven lifecycle is always the same as the Docker daemon that will actually run the image.
How do I create a dockerfile from Maven assembly files?
An own configuration syntax can be used to create a Dockerfile. For specifying artefacts and other files, the plugin uses the assembly descriptor format from the maven-assembly-plugin to copy over those file into the Docker image. An external Dockerfile can be specified in which Maven properties can be inserted.
What is Docker maven?
Maven is used for project build, dependency management, and documentation. The pom. xml file of a maven-based project holds all the dependencies, repositories, etc., needed to build and run that project. Dockerizing is the process of packing, deploying, and running applications using Docker containers. -
Is Docker and Maven same?
Docker belongs to "Virtual Machine Platforms & Containers" category of the tech stack, while Apache Maven can be primarily classified under "Java Build Tools". Some of the features offered by Docker are: Integrated developer tools. open, portable images.
How do I create a Docker image using Maven plugin?
Access to a Docker repo (optional, only if you want the image to be pushed to a remote repo).Define a Dockerfile and place it under your Maven project root folder where pom. xml resides.In your pom.xml, under
What is fabric8 Maven plugin?
The fabric8-maven-plugin (f8-m-p) brings your Java applications on to Kubernetes and OpenShift. It provides a tight integration into Maven and benefits from the build configuration already provided. This plugin focus on two tasks: Building Docker images and creating Kubernetes and OpenShift resource descriptors.
How do I run a docker image in Maven?
Working example.Generate an application. Use the spring initializer to generate a demo app. ... Create a Dockerfile. ... Build the image. ... Run the image.
How do I run a Maven test in Docker?
Instructions to run in docker container: Run a container using the image built in the first step. Run mvn clean test command inside the container. (This command can be run using the docker file itself.
Can Maven build Docker images?
Jib is a Maven and Gradle plugin for creating Docker images for Java applications. A benefit is that it does not require Docker to be installed locally* which can be useful for Continuous Integration / build server — the jib-maven-plugin will build and push the image straight to the Docker registry of choice.
What is an image in Docker?
A Docker image is a file used to execute code in a Docker container. Docker images act as a set of instructions to build a Docker container, like a template. Docker images also act as the starting point when using Docker. An image is comparable to a snapshot in virtual machine (VM) environments.
What is Docker image in spring boot?
Docker is a Linux container management toolkit with a “social” aspect, letting users publish container images and consume those published by others. A Docker image is a recipe for running a containerized process. In this guide, we build one for a simple Spring boot application.
What is the meaning of Fabric8?
What is it? Fabric8 is an integrated open source DevOps and Integration Platform which works out of the box on any Kubernetes or OpenShift environment and provides Continuous Delivery, Management, ChatOps and a Chaos Monkey.
What is io Fabric8?
fabric8 is discontinued Maven plugin for running and creating Docker images. OpenShift ElasticSearch plugin. Dynamically update the SearchGuard ACL based on a user's name. Transform kibana index requests to support multi-tenant deployments for non-operations users when so configured.
What is Maven OpenShift?
Introduction. The openshift-maven-plugin brings your Java applications on to OpenShift. It provides a tight integration into Maven and benefits from the build configuration already provided. This plugin focus on two tasks: Building Docker images and creating Kubernetes resource descriptors.
What is the difference between Docker and Apache?
Apache Tomcat is a Java process that contains J2EE servlets and JavaServer Pages. A Docker container is an operating system (OS) construct that contains a usable OS (as close as it can get) seperate from the host OS (as seperate as it can).
What is a Docker file?
A Dockerfile is a text document that contains all the commands a user could call on the command line to assemble an image. Using docker build users can create an automated build that executes several command-line instructions in succession. This page describes the commands you can use in a Dockerfile .
How do I install Docker?
Install from a packageInstall Docker Engine, changing the path below to the path where you downloaded the Docker package. $ sudo dpkg -i /path/to/package.deb. The Docker daemon starts automatically.Verify that Docker Engine is installed correctly by running the hello-world image. $ sudo docker run hello-world.
What is Java Maven project?
Maven is written in Java and is used to build projects written in C#, Scala, Ruby, etc. Based on the Project Object Model (POM), this tool has made the lives of Java developers easier while developing reports, checks build and testing automation setups.
What are the configuration options for Docker Maven?
Other configuration options exist for building Docker image, they are: “contextDir” (what I mentioned), “dockerFile”, and “dockerArchive”. For more detail, see the documentation of Docker Maven Plugin, chapter 5.1 docker:build.
What is port mapping in Docker?
Port mapping ( <ports> ). The “ports” configuration contains a list of port mappings. Each of them binds a port of the container to a port of the host machine. This is equivalent to the port mapping when using the Docker CLI with option -p. In Debezium, the container port defined by Maven property postgres.port (value: 5432) is bound to port 5432 of the host machine.
What are the artifacts created by Maven?
The typical artifacts created by Maven are JAR, WAR, and EAR. Thanks to Maven Docker Plugin, we can also deliver Docker images from Maven build. It means that we can run the build in one line even with Docker included. Without Docker Maven Plugin, meeting this requirement wouldn’t be easy, it would require us to configure the build pipeline in CI, such as Travis, Jenkins, or GitLab. This will be less user-friendly for localhost development and more CI-dependent. Also, using Docker Maven Plugin makes the build benefit from maven properties or the Maven system in general.
Why use Binding Goal Docker Stop?
Also, binding goal docker:stop to phase post-integration-test so those containers can be trashed after integration tests. It is recommended to use the maven-failsafe-plugin for integration testing to stop the docker container even when the tests fail.
What is the expression $base in Maven?
In that “src/main/docker” folder under that sample module, you can see the following Dockerfile. Expressions like $ {base} are placeholders and their actual values are injected by Maven using the filtering mechanism:
Can you run Docker Maven?
Being able to run Docker containers during Maven build is another advantage. It enables many possibilities for testing: you can test apps running on different versions of Java, different programming languages, different operation systems, and more. It also helps to avoid classpath conflicts in your dependencies. Thanks to Docker Maven Plugin, Debezium can test different databases, such as MySQL, PostgreSQL, and SQL Server effortlessly.
Can you declare Maven plugins in POM?
You can declare Docker Maven Plugin as other Maven plugins in your POM file. Here is an example from “Debezium Connector for PostgreSQL”. In this excerpt, we can see that the configuration is grouped by image: each image has its configuration sections for building ( <build>) and running ( <run> ). The structure of both sections is very similar to their original Docker commands: docker-build command (Dockerfile reference) and docker-run command . Let’s get into these commands in the next paragraphs.
What is a Maven plugin?
This plugin was the initial Maven plugin used at Spotify for building Docker images out of Java services . It was initially created in 2014 when we first began experimenting with Docker. This plugin is capable of generating a Dockerfile for you based on configuration in the pom.xml file for things like the FROM image, resources to add with ADD / COPY, etc.
How to use Dockerfile?
To use a Dockerfile, you must specify the dockerDirectory element. If specified, the baseImage, maintainer, cmd and entryPoint elements will be ignored. The contents of the dockerDirectory will be copied into $ {project.build.directory}/docker. Use the resources element to copy additional files, such as the service's jar file.
Where is the Docker log?
Check the Docker daemon log (typically at /var/log/docker.log or /var/log/upstart/docker.log) for more details.
What are other docker-standard environment variables?
Other docker-standard environment variables are honored too such as TLS and certificates.
Can you force docker to overwrite image tags?
Optionally, you can force docker to overwrite your image tags on each new build:
Does Docker Maven use authentication?
Since version 1.0.0, the docker-maven-plugin will automatically use any authentication present in the do cker-cli configuration file at ~/.dockercfg or ~/.docker/config.json, without the need to configure anything (in earlier versions of the plugin this behavior had to be enabled with <useConfigFile>true</useConfigFile>, but now it is always active).
Can you bind a Maven project to a Maven phase?
If you have a multi-module project where a sub-module builds an image, you will need to do this binding so the image gets built when maven is run from the parent project.
What is the purpose of Docker plugin?
One purpose of this plugin is to create Docker images holding the actual application. This is done with the docker:build goal. It is easy to include build artefacts and their dependencies into an image.
What does stop docker do?
Stops and removes a docker container. This goal stops every container started with <docker:start> either during the same build (e.g. when bound to lifecycle phases when doing integration tests) or for containers created by a previous call to <docker:start>
Why use maven failsafe?
It is recommended to use the maven-failsafe-plugin for integration testing in order to stop the docker container even when the tests fail. For proper isolation, container exposed ports can be dynamically and flexibly mapped to local host ports.
What is plugin configuration?
The plugin configuration contains a global part and a list of image-specific configuration within a <images> list, where each image is defined within a <image> tag. See below for an example.
What is a mount container?
A container can bind (or "mount") volumes from various source when starting up: Either from a directory of the host system or from another container which exports one or more directories. The mount configuration is specified within a <volumes> section of the run configuration. It can contain the following sub elements:
Can you build a service image in Maven?
You can build the service image, start up all containers and go into a watch loop. Again, you need the package phase in order that the assembly can find the artifact build by this project. This is a Maven limitation. The db image will never be watch since it assumed to not change while watching.
Can you use placeholders in Maven?
When specifying the image name in the configuration with the <name> field you can use several placeholders which are replaced during runtime by this plugin. In addition you can use regular Maven properties which are resolved by Maven itself.
Docker-Maven-Plugin
By default the plugin will try to connect to docker on localhost:2375. Set the DOCKER_HOST environment variable to connect elsewhere.
Docker Machine
If you're using Docker Machine, these environment variables are set when you run :
Docker for Windows
If you're on Windows, you may find it helpful to use the native client Docker to give everything a more native experience.
What is Spotify Maven Docker?
The Docker plugin from Spotify is the embodiment of simplicity. It actually supports only two operations: building a Docker image and pushing a Docker image to the Registry.
Why does Maven have two plugins?
The two plugins work by allowing Maven to control Docker during the build process.
Where is the Docker image placed?
Once you select your Dockerfile and without any other configuration Codefresh performs a build and the resulting Docker image is placed on the internal Docker registry (built-in with each Codefresh account).
What are the advantages of Docker?
The approach has several advantages. First of all, it makes the combination , future proof as the API of the docker daemon is no longer relevant to the build process. Secondly, it makes for really simple build slaves (they only have Docker installed and nothing else)
Does Fabric8 support Docker?
Hopefully, the fabric8 plugin also supports plain Dockerfiles. Even there, however, it has some strong opinions. It assumes that the Dockerfile of a project is in src/main/docker and also it uses the assembly syntax for actually deciding what artifact is available during the Docker build step.
Can you use Fabric8 without Docker?
At first glance, the fabric8 plugin seems very opinionated. As a starting point, you can create Docker images with it without actually having a Dockerfile! Instead, the plugin allows you to describe your image in an XML format that will be then converted to a Dockerfile on the fly. Here is an example straight out of the documentation.
Is Maven the same as Docker?
I have seen at least two companies that instead of using a dedicated Docker plugin, are just calling the native Docker executable via the maven exec plugin. This means that the Docker version that is injected in the Maven lifecycle is always the same as the Docker daemon that will actually run the image. This solution is not very elegant but it is more resistant to API breakage and guarantees the latest Docker version for the Maven build process.
Overview
Motivation
- If we don’t have the failsafe plugin in our pom.xmlfile, let’s add it first: Now, let’s add the Docker Maven plugin in our pom.xmlfile: The failsafe Maven plugin allows to add hooks before and after the integration test execution using the pre-integration-test and post-integration-test. Here, we’re configuring the plugin to start the images before ...
Structure
Build
Run
- The typical artifacts created by Maven are JAR, WAR, and EAR. Thanks to MavenDocker Plugin, we can also deliver Docker images from Maven build. It means thatwe can run the build in one line even with Docker included. Without Docker MavenPlugin, meeting this requirement wouldn’t be easy, it would require us toconfigure the build pipeline in CI, such as Travis, Jenkins, or GitLa…
Goal Binding
- You can declare Docker Maven Plugin as other Maven plugins in your POM file.Here is an example from “Debezium Connector for PostgreSQL”. In this excerpt, wecan see that the configuration is grouped by image: each image hasits configuration sections for building (<build>) and running (<run>).The structure of bothsections is very similar to their ori...
Conclusion
- There are two modes to build a Docker image using Docker Maven Plugin: inline pluginconfiguration or external Dockerfile/Docker archive. Regardless which modechosen, the images will be built via Maven goal: Note that if you just want to run tests against an existing image, you don’tneed build your own image: pulling that image from Docker registry is enough.
References
- Creating and running Docker containers is done using Maven goal “docker:start”.This goal evaluates the configuration of <run>section of each image. We are going to explore some detail using the source code of “DebeziumConnector for PostgreSQL”. We will see the configuration for naming strategy,environment variables, port mapping, logging, and wait for startup completion. …