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daemon-scheduler

Description

The daemon-scheduler allows you to run exactly one task per host across all nodes in a cluster. It monitors the cluster state and launches tasks as new nodes join the cluster, and it is ideal for running monitoring agents, log collectors, etc. The daemon-scheduler can be used a reference for how to use the cluster-state-service to build custom scheduling logic.

Concepts

The daemon-scheduler defines and depends on the following concepts:

  • An Environment represents the configuration for desired state of the tasks to be maintained. For the daemon-scheduler, the environment indicates the task definition to launch in a specific cluster.
  • Deployment is the operation that brings the environment into existence. Deployment indicates to the scheduler that the desired configuration state in Environment should be established in the cluster.

REST API

The daemon-scheduler API:

  • Creates and lists environments
  • Creates and lists deployments

Building the daemon-scheduler

The daemon-scheduler depends on golang and go-swagger. Install and configure golang. For more information about installing go-swagger, see the go-swagger documentation.

$ git clone https://github.com/blox/blox.git blox/blox
$ cd blox/blox/daemon-scheduler
$ make get-deps
$ make

# Find the daemon-scheduler binary in 'out' folder
$ ls out/
LICENSE                 daemon-scheduler

Usage

The daemon-scheduler depends on the cluster-state-service. We provide an AWS CloudFormation template to set up the necessary prerequisites for the cluster-state-service. After the prerequisites are ready, you can launch the daemon-scheduler via the Docker compose file. For more information, see the Blox Deployment Guide.

To launch the daemon-scheduler manually, use the following steps.

Quick Start - Launching daemon-scheduler

The daemon-scheduler is provided as a Docker image for your convenience. You can launch it using the following command. Use the appropriate values for AWS_REGION, AWS_PROFILE, etcd IP address and port, and the cluster-state-service IP address and port.

docker run -e AWS_REGION=us-west-2 \
    AWS_PROFILE=default \
    -v ~/.aws:/.aws \
    -v /tmp/ds-logs:/var/output/logs \
    bloxoss/daemon-scheduler:0.3.0 \
    --etcd-endpoint $ETCD_IP:$ETCD_PORT \
    --css-endpoint $CSS_IP:$CS_PORT

API endpoint

After you launch the daemon-scheduler, you can interact with and use the REST API by using the endpoint at port 2000. Identify the daemon-scheduler container IP address and connect to port 2000. For more information about the API definitions, see the swagger specification.