Unifi Controller (Follow up: monitoring with Digital Ocean)

tl;dr The code for the complete Unifi setup is available in the niels-s/unifi-terraform-example repo

After setting up my droplet and keeping an eye on it, I noticed DigitalOcean offers some more “enhanced” monitoring. Unfortunately, we don’t get that functionality straight out of the box because we use a CoreOS image 😅. So we have to do a little more work than with other distros.

Setting up the DigitalOcean client is straight forward since DO already provides a Docker image. We can practically do the same as we did before and add another systemd service to run the DO agent.

data "ignition_config" "unifi_controller" {
  ...

  systemd = [
    ...
    data.ignition_systemd_unit.do_agent_unit.rendered
  ]
}

// DigitalOcean Metric Agent
data "ignition_systemd_unit" "do_agent_unit" {
  name    = "do-agent.service"
  enabled = true

  content = <<-CONFIG
    [Unit]
    Description=The DigitalOcean Monitoring Agent
    Requires=docker.service
    After=docker.service
    After=network-online.target
    Wants=network-online.target

    [Service]
    Restart=always
    ExecStartPre=/usr/bin/docker pull digitalocean/do-agent:stable
    ExecStartPre=-/usr/bin/docker stop do-agent
    ExecStartPre=-/usr/bin/docker rm do-agent
    ExecStart=/usr/bin/docker run \
        --name do-agent \
        --restart=no \
        -v /proc:/host/proc:ro \
        -v /sys:/host/sys:ro \
        digitalocean/do-agent:stable

    [Install]
    WantedBy=multi-user.target
  CONFIG
}

Alerts

At the time of writing, the Digital Ocean Terraform provider doesn’t implement setting up alerts, so you will need to visit the DO Dashboard, so configure some rules yourself.

I was hoping I could also monitor the extra block volume I’ve attached, but unfortunately, the DO agent doesn’t recognize/monitor that volume at the moment. I will need to spend some more time looking into it perhaps it’s configurable 🤞

The code for the complete Unifi setup is available in the niels-s/unifi-terraform-example repo , the changes of this post can be found in this commit