Containers in Artemis

Artemis is Toit's fleet management system. It takes full advantage of Toit's containerization to provide a convenient way to manage multiple programs on a device.

Prerequisites

We assume that you have read the container introduction.

Pod specification

Containers are usually declared in the pod specification.

For example:

  "containers": {
    "hello": {
      "entrypoint": "hello.toit"
    },
    "solar": {
      "entrypoint": "examples/solar_example.toit",
      "git": "https://github.com/toitware/toit-solar-position.git",
      "branch": "v0.0.3"
    }
  }

When building a pod, Artemis will compile the container programs (potentially downloading them via git) and bundle the resulting binaries into the pod.

Pods can then be used to update devices. See the fleet description for more information.

Installing containers manually

Artemis also supports installing containers manually on individual devices. In that case, Artemis behaves slightly similar to Jaguar, in that containers are installed dynamically on the device and are executed without the device needing to reboot. However, Artemis (contrary to Jaguar) installs containers asynchronously. That is, Artemis uploads the container and updates the device's configuration to install the container, but it does not wait for the container to be installed before returning. The next time the device connects to the broker it will download and install the container.

To install a container manually, use the following command:

artemis device -d <device-id> container install <container-name> <path-to-program>

Containers can also be installed with triggers, such as --trigger=gpio-high:32. See the help of the container install command.