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Nomad Jobs

We've included Nomad jobs for the following:

System jobs run on all nodes. We have the following:

  • dnsmasq -- DNS server on port 53. Forwards requests like prometheus.service.consul to the local Consul server, and uses the container's resolv.conf to reply to all other requests. This allows all jobs to set the dns_servers Docker config to the node IP.
  • fabio -- HTTP load balancer. Used to forward apps to :9990/$APP_NAME. Set a Consul service tag like fabio-/something and it will forward traffic from :9990/something to that service.
  • telegraf -- collects stats from the system, Consul and Nomad. Requires influxdb

We also run some jobs as services:

  • influxdb -- service that stores data from telegraf
  • prometheus -- collects metrics from Nomad
  • grafana -- displays dashboards with data from Prometheus and Influxdb
  • registry -- local registry to cache docker images

Finally, we have one periodic job:

  • docker-system-prune -- runs docker system prune --all --force --volumes on a single node every hour, since periodic system jobs are not supported by Nomad.

The ./cluster.py run-jobs command will trigger the deployment of the files in ./etc/*.nomad. This command is automatically run by the start command.

To start some of these jobs, set:

[cluster]
run_jobs = fabio,grafana,prometheus,dnsmasq