Harness with Docker-compose

Version 1.1-SNAPSHOT

With docker-compose Harness and all services it depends on run in Docker Containers, even the harness-cli is installed in its own container. This makes it fairly easy to install on a single machine for experiments or when only vertical scaling is required.

Harness + UR

Prerequisites

Install the Docker components for managing containers. This should be done as a regular user on the host -- a non-root user with passwordless sudoer permissions. See instructions like these or as appropriate for your "host" OS. You'll need from Docker:
- Docker itself, including whtever is needed to host running containers.
- Docker-compose, some extensions that allow a network of containers to be run on a single host.
Although this project MAY work on Windows it has not been tested and the examples commands below assume a 'nix style command shell like bash.

Configure

Map container directories into the host filesystem for all of the composed containers.

cd harness-docker-compose
cp .env.sample .env
edit the .env file if the defaults are not adequate.

One important thing to note is that in order to import files using harness-cli import <engine-id> some/path/to/json the path to the json must be resolved in the harness container AND the harness-cli container will need a place to persist engine json files. This is solved by mapping a host directory into both containers (for convenience) like this:

Deployment

With the docker daemon running:

docker-compose up -d --build for first time setup

Once deployed one or more containers in the collection can be updated. It is best to explore the docker-compose cli and options as well as docker commands. Some useful commands for updates are:

docker-compose down stops all container in the local yaml file. Do this before any other docker-compose updates.
git pull origin <branch> for this repo the lastest vesion under test is in branch develop, the last stable release is in master. The git repo contains the latest project structure and docker-compose.yml.
docker-compose up -d --build --force-recreate to bring up all updated containers by recreating all images.
docker-compose pull is a very important command that will get the latest image version from the ActionML automated CI/CD pipeline. Note: this project uses a possibly unstable develop/SNAPSHOT version of Harness. To change this, edit docker-compose.yml and change the versions to harness:latest and harness-cli:latest, which will get stable released versions.

Operations

Once installed the containers work somewhat like a cluster of virtual machines all running on a single host. You can login to them, examine logs, and start and stop them.

Upgrades Experimental

Note: This project uses watchtower to monitor the image tagged actionml/harness:develop When it is updated the new image will be automatically pulled and deployed. This may not fit your use case and since the "develop" image is targeted this will pull unreleased code! To change this, fork the project and edit docker-compose.yml to target any supported image tag, like actionml/harness/latest to get the latest release.

This is not a thorough upgrade mechanism since some migration of data may be required during an upgrade so beware anything but experimental use of this feature based on watchtower.

Upgrades Stable

To use this docker-comnpose project reliably is is best to target a named version of Harness tagged with 0.5.1 (due for release Feb 28 2020) or later and only upgrade manually by updating the image tag you have in docker-compose.yml and following Docker instructions for things like:

docker-compose pull
docker-compose down
docker-compose up -d --build --force-recreate

Be aware the this may be dangerous if Harness schemas have changed, consult release notes for your version and the version you wish to use

Logs

Harness logs are in the docker-persistence/harness/... directory and can be tailed on the host as any local log file. Other containers may have logs available by using:

docker-compose logs <some-container-id>

Monitoring

Simple monitoring can be done by looking at memory, disk and CPU usage since all containers are running on the host.

To get more granular several tools allow monitoring individual containers.

Persistence

The way Docker supports persistence uses a mapping of container internal file system to the host's file system. By default they will appear in harness-docker-compose/docker-persistence/... Be careful with these files, they will contain data for the database and elasticsearch.

Harness CLI

The Harness-CLI is also started in a container. To use it, log-in.

docker-compose exec harness-cli bash

This starts a bash shell in the container, configured to communicate with the Harness container
docker-compose exec harness-cli bash -c 'harness-cli status'

this will return the status of Harness

The harness-cli can also be installed on the host OS as desired. It uses the REST API to control Harness and so can be on any host that can connect.

Versions

1.1-SNAPSHOT: Upgrades to Mongo 4.2
1.0: containers:
- harness develop
- harness-cli develop
- mongo:3.2
- elasticsearch:7.6

actionml/harness-docker-compose

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