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Monitor Docker containers from your Mac

Know when a container on your Mac crashes, runs out of memory or can't start. The alert carries its last 30 log lines, and an agent you hand it to gets them too.

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What CoIsland watches in Docker

Each monitor kind brings its own query and its own card in the island.

How to monitor Docker containers on your Mac

A container that dies in the background is easy to miss until a page stops loading. A Docker monitor checks every minute, says which container went down and why, and brings what it printed last.

-- name: My app's containers
-- kind: docker.down
-- connector: docker
-- every: 1m

project:my-app

name: takes a container’s name or a glob like name:web-*, project: a Compose project, and image: an image, with or without its tag. Connect Docker covers the socket, both kinds and the limits you can set. Local dev watches the ports and processes beside your containers, and all connectors share one page.

Connect it in three steps

  1. Add a Docker connector. It needs only a name, and finds Docker Desktop, OrbStack, Colima, Rancher Desktop or Podman by itself.

  2. Pick a monitor kind and the containers it watches, by name or Compose project. name:* watches every one.

  3. Containers down also comes as a recommended monitor, added in one click. Each monitor checks every minute unless you change it.

Built for Docker

  • Read only. Every request to Docker is a GET, and CoIsland never starts or stops a container.
  • No token and nothing to install. It reads Docker through its socket on this Mac.
  • A crash alerts once, with the container's last 30 log lines. A clean docker stop or quitting Docker stays quiet.
  • When Docker isn't running, the card says so and nothing alerts. Nothing is lost when it comes back.

Then hand it to an agent

A click on the alert opens the agent in a terminal under it, with the whole alert as its first message.

Docker questions

Which Docker apps does it work with?

Docker Desktop, OrbStack, Colima, Rancher Desktop and Podman. CoIsland finds their socket by itself. If yours lives somewhere else, give its path in the connector's Socket field.

Does stopping a container raise an alert?

Not when it exits 0, 130, 137 or 143, the codes docker stop and quitting Docker leave. A program that exits with its own error code when told to stop still alerts, and so do a crash, an out-of-memory kill or a failed start, once each.

What does an agent get when I hand it a crash?

The whole alert as its first message, the container's last 30 log lines included. Claude Code, Codex and Cortex Code all get the same.

Does it watch a remote Docker host or Kubernetes?

No. It reads Docker on this Mac only, and it only reads. It never starts, stops or changes a container.

Other connectors

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