# Docker Image Example

This is an example on how you could create your own Docker Image For Apache
ActiveMQ Artemis based on CentOS or Ubuntu (Eclipse Temurin JDK images).

# Preparing

Use the script ./prepare-docker.sh as it will copy the docker files under the
binary distribution.

Below is shown the command to prepare the build of the Docker Image starting
from the local distribution (from the source codes of ActiveMQ Artemis)

```
# Prepare for build the Docker Image from the local distribution. Replace the 
# {local-distribution-directory} with your directory.
$ ./prepare-docker.sh --from-local-dist --local-dist-path {local-distribution-directory}
```

The output of the previous command is shown below.

```
$ ./prepare-docker.sh --from-local-dist --local-dist-path ../artemis-distribution/target/apache-artemis-2.17.0-SNAPSHOT-bin/apache-artemis-2.17.0-SNAPSHOT

Using ../artemis-distribution/target/apache-artemis-2.17.0-SNAPSHOT-bin/apache-artemis-2.17.0-SNAPSHOT
Cleaning up ../artemis-distribution/target/apache-artemis-2.17.0-SNAPSHOT-bin/apache-artemis-2.17.0-SNAPSHOT/docker
Docker file support files at:
../artemis-distribution/target/apache-artemis-2.17.0-SNAPSHOT-bin/apache-artemis-2.17.0-SNAPSHOT/docker
├── Dockerfile-centos7-11
├── Dockerfile-ubuntu-11
├── Dockerfile-ubuntu-11-jre
└── docker-run.sh

0 directories, 4 files

Well done! Now you can continue with building the Docker image:

  # Go to ../artemis-distribution/target/apache-artemis-2.17.0-SNAPSHOT-bin/apache-artemis-2.17.0-SNAPSHOT
  $ cd ../artemis-distribution/target/apache-artemis-2.17.0-SNAPSHOT-bin/apache-artemis-2.17.0-SNAPSHOT

  # For CentOS with full JDK
  $ docker build -f ./docker/Dockerfile-centos7-11 -t artemis-centos .

  # For Ubuntu with full JDK
  $ docker build -f ./docker/Dockerfile-ubuntu-11 -t artemis-ubuntu .

  # For Ubuntu with just JRE
  $ docker build -f ./docker/Dockerfile-ubuntu-11-jre -t artemis-ubuntu .

  # For Ubuntu on Linux ARMv7/ARM64 with full JDK
  $ docker buildx build --platform linux/arm64,linux/arm/v7 --push -t {your-repository}/apache-artemis:2.17.0-SNAPSHOT -f ./docker/Dockerfile-ubuntu-11 .

Note: -t artemis-centos and -t artemis-ubuntu are just tag names for the purpose of this guide

For more info see readme.md.
```

The command to prepare the build of the Docker Image starting from the official
release of ActiveMQ Artemis is shown below

```
# Prepare for build the Docker Image from the release version. Replace the
# {release-version} with the version that you want 
$ ./prepare-docker.sh --from-release --artemis-version {release-version}
```

The output of the previous command is shown below.

```
$ ./prepare-docker.sh --from-release --artemis-version 2.16.0
Creating _TMP_/artemis/2.16.0
Downloading apache-artemis-2.16.0-bin.tar.gz from https://downloads.apache.org/activemq/activemq-artemis/2.16.0/...
################################################################################################################################################################################################################################ 100,0%
Expanding _TMP_/artemis/2.16.0/apache-artemis-2.16.0-bin.tar.gz...
Removing _TMP_/artemis/2.16.0/apache-artemis-2.16.0-bin.tar.gz...
Docker file support files at:
_TMP_/artemis/2.16.0/docker
├── Dockerfile-centos7-11
├── Dockerfile-ubuntu-11
├── Dockerfile-ubuntu-11-jre
└── docker-run.sh

0 directories, 4 files

Well done! Now you can continue with building the Docker image:

  # Go to _TMP_/artemis/2.16.0
  $ cd _TMP_/artemis/2.16.0

  # For CentOS with full JDK
  $ docker build -f ./docker/Dockerfile-centos7-11 -t artemis-centos .

  # For Ubuntu with full JDK
  $ docker build -f ./docker/Dockerfile-ubuntu-11 -t artemis-ubuntu .

  # For Ubuntu with just JRE
  $ docker build -f ./docker/Dockerfile-ubuntu-11-jre -t artemis-ubuntu .

  # For Ubuntu on Linux ARMv7/ARM64 with full JDK
  $ docker buildx build --platform linux/arm64,linux/arm/v7 --push -t {your-repository}/apache-artemis:2.16.0 -f ./docker/Dockerfile-ubuntu-11 .

Note: -t artemis-centos and -t artemis-ubuntu are just tag names for the purpose of this guide

For more info read the readme.md
```

# Building

Go to `$ARTEMIS_DIST` where you prepared the binary with Docker files.

## For CentOS

From within the `$ARTEMIS_DIST` folder:
```
$ docker build -f ./docker/Dockerfile-centos7-11 -t artemis-centos .
```

## For Ubuntu

From within the `$ARTEMIS_DIST` folder:
```
$ docker build -f ./docker/Dockerfile-ubuntu-11 -t artemis-ubuntu .
```

## Smaller Ubuntu image with just JRE
From within the `$ARTEMIS_DIST` folder:
```
$ docker build -f ./docker/Dockerfile-ubuntu-11-jre -t artemis-ubuntu .
```

# For Ubuntu (Build for linux ARMv7/ARM64)
```
$ docker buildx build --platform linux/arm64,linux/arm/v7 --push -t {your-repository}/apache-artemis:2.17.0-SNAPSHOT -f ./docker/Dockerfile-ubuntu-11 .
```

**Note:**
`-t artemis-centos` and `-t artemis-ubuntu` are just tag names for the purpose of this guide


# Environment Variables

Environment variables determine the options sent to `artemis create` on first execution of the Docker
container. The available options are:

**`ARTEMIS_USER`**

The administrator username. The default is `artemis`.

**`ARTEMIS_PASSWORD`**

The administrator password. The default is `artemis`.

**`ANONYMOUS_LOGIN`**

Set to `true` to allow anonymous logins. The default is `false`.

**`EXTRA_ARGS`**

Additional arguments sent to the `artemis create` command. The default is `--http-host 0.0.0.0 --relax-jolokia`.
Setting this value will override the default. See the documentation on `artemis create` for available options.

**Final broker creation command:**

The combination of the above environment variables results in the `docker-run.sh` script calling
the following command to create the broker instance the first time the Docker container runs:

    ${ARTEMIS_HOME}/bin/artemis create --user ${ARTEMIS_USER} --password ${ARTEMIS_PASSWORD} --silent ${LOGIN_OPTION} ${EXTRA_ARGS}

Note: `LOGIN_OPTION` is either `--allow-anonymous` or `--require-login` depending on the value of `ANONYMOUS_LOGIN`.

# Mapping point

- `/var/lib/artemis-instance`

It's possible to map a folder as the instance broker.
This will hold the configuration and the data of the running broker. This is useful for when you want the data persisted outside of a container.


# Lifecycle of the execution

A broker instance will be created during the execution of the instance. If you pass a mapped folder for `/var/lib/artemis-instance` an image will be created or reused depending on the contents of the folder.



## Running a CentOS image

The image just created in the previous step allows both stateless or stateful runs.
The stateless run is achieved by:
```
$ docker run --rm -it -p 61616:61616 -p 8161:8161 artemis-centos 
```
The image will also support mapped folders and mapped ports. To run the image with the instance persisted on the host:
```
docker run -it -p 61616:61616 -p 8161:8161 -v <broker folder on host>:/var/lib/artemis-instance artemis-centos 
```
where `<broker folder on host>` is a folder where the broker instance is supposed to
be saved and reused on each run.
