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- We are setting a precedent for installation of optional third-party components
- To simplify the installation process, keep each operation atomic, and to allow components to be installed in any order, all component installations will be decoupled from the base anax installation.
- The process should also function if a person is "bringing their own already-installed component" and we are just integrating anax with a pre-existing EdgeLake installation.
- EdgeLake interactions with Open Horizon will be expressed as intents in a "data" policy
- This data policy can be embedded within a node policy, service definition, and/or a deployment policy.
- Deployment policies can override the node's default data policy due to greater specificity.
- The default case will be based on native applications, not containerized versions, although both options or a mix thereof should work.
- The integration should also be easily reversible.
- A node may have more than one anax agent running, but anax > 1 must always be containerized.
anax agent installation
Today, installing the agent on the target device involves running the "agent-install.sh" script as documented at Automated agent installation and registration. At this point, we are assuming that no signal needs to be sent to this installation script and process to notify it that EdgeLake should also be installed. If that were the case, we should consider a flag in the form of an installation argument or an environment variable. This will allow us to decouple the process of installing EdgeLake as an optional data component.
EdgeLake agent installation
Instead of altering the "agent-install.sh" script to trigger the EdgeLake installation process, we are proposing that a completely separate script be created that will install a native EdgeLake application, and then signal to anax that it has been installed and is ready to use. This assumes that anax has already been installed and configured, but does not need to be registered with an exchange for EdgeLake to be installed. In fact, if we are proposing to create or modify the node policy file, it is better if the anax agent is not currently registered.
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