research-iobserve / execution-evaluation-experiments

Execution of Evaluation Experiments

This repository contains PCM models of the JPetstore to evaluate the execution of system adaptations on a kubernetes cluster. It contains the following artifacts:

• The kubernetes folder contains different kubernetes configurations for different scenarios. They are used to create an initial JPetStore deployment.
• The iobserve folder contains dummy configuration files for iObserve's planning, adaptation, and execution services. These files contain placeholders for concrete paths.
• The scenarios folder contains a runtime and a redeployment model for each evaluated adaptation scenario as they would result from iObserve's planning phase. The further represents the JPetStore's present architecture and the latter represents its intended architecture. The included correspondence model maps the PCM model components to the deployable images.

A number of scripts can be used to execute the evaluation. We recommend to use watch kubectl get <target> to watch services, deployments, and pods while executing the different scripts. Before executing the evaluation scripts take a look at the config file:

• Use the config file to set the paths to your working directory and docker repository they differ from the preset values. Set the SCENARIO variable to choose the scenario you want to execute. Currently migration, replication, and dereplication are possible scenarios.

The following scripts are included and should be executed in the given order:

1. startup-kube-jpetstore.sh depending on the scenario from the config file it creates an initial JPetStore deployment.
2. iobserve-setup sets up the working directories of the different services, creates configuration files with concrete paths instead of placeholders, and modifies the planning's main method to mock the actual planning and just send out predefined models. Depending on the scenario runtime and redeployment models are inserted to the planning's working directory.
3. iobserve-run-all starts planning, adaptation, and execution services and finishes them after a given time. The planning service will send out the models from its working directory.
4. shutdown-kube-jpetstore terminates the deployed kubernetes instances.

As an alternative to the iobserve-run-all you can use the following scripts:

• iobserve-run-planning, iobserve-run-adaptation, and iobserve-run-execution can be used to start the different services indepentently.
• iobserve-setup-planning can be used to (re)configure only the planning service while adaptation and execution keep running. Before reconfiguring the planning service a new scenario may be chosen by editing the config file.

The evaluaton results can be found at the lbl-results branch in the results folder.