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resque_to_cloudwatch

This is a gem containing a daemon for submitting Resque metrics to AWS Cloudwatch. In addition, it can (optionally) submit these metrics to Graphite.

It collects and pushes the following metrics:

  • number of jobs in all Resque queues (resque_queues)
  • number of workers currently working (resque_workers_working)
  • number of workers currently alive (resque_workers_alive)
  • work remaining, which is workers working + queue length (resque_work_remaining)

Usage

The daemon lives at bin/resque_to_cloudwatch, and takes only a single parameter:

bin/resque_to_cloudwatch --config /path/to/config.yaml

If you don't supply this parameter, the daemon will look for a config file in the current directory.

Configuration

The config file has the following format (in YAML):

access_key_id: asdfasfasd
secret_access_key: asdfasdfasf
region: 
 - us-west-2
project: testing
hostname: laptop
redis_host: some.redis.host
redis_port: 6379
period: 60
namespace: F3D

access_key_id, secret_access_key

Your AWS access key/secret key pair.

region

Region(s) of Cloudwatch the metrics should be submitted to. This can either be a string, or a list of regions to send the metric to.

project, namespace, hostname

These can actually contain any text - they are submitted as "dimensions" along with the metric value. A single metric in Cloudwatch is uniquely identified by its name (hardcoded to resque_queues, resque_workers_working and resque_workers_alive in this gem), and any dimensions it has. At Forward3D, we have a number of autoscaling "projects" (codebases), so we use the project dimension to represent that. Namespace is more important, as that determines how the metric is categorised in the Cloudwatch interface. Hostname can be anything, or blank - we set it to the hostname of the submitting machine.

redis_host, redis_port

Redis host and port.

enable_graphite, graphite_host, graphite_port

This gem can also send the metric it collects to Graphite - set enable_graphite to true, and set the Graphite host and port if you want to the daemon to do this.

period

The period of the EventMachine loop - how often stats are collected and sent.

Graphite metric

The Graphite metric name will look like this:

resque_to_cloudwatch.namespace.metric_name.hostname.project