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simulation.md

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Simulation at high scale

To simulate at high scale leaf-hub-status-sync component must be replaced with leaf-hub-simulator.

Please follow the instructions at leaf-hub-simulator to deploy the component.

Pay attention to NUMBER_OF_SIMULATED_LEAF_HUBS environment variable - it defines the number of additional (simulated) LHs. If the environment variable is not provided or equal to 0, the simulator will behave as the original leaf-hub-status-sync.

The simulation uses the following tools:

  • CLC simulator - creates, deletes or keeps alive mock managed clusters (ManagedCluster CR).
  • GRC simulator - patches policy (Policy CR) compliance statuses.

Recommendation: install the above tools on a separate VM and run them with the nohup command (nohup <YOUR COMMAND> &) to ensure the tools are running even when the terminal to the VM is disconnected.

Before starting the simulation ensure the environment is "clean":

  1. stop sync service at LH - kubectl scale deployment sync-service-ess -n sync-service --replicas 0
  2. stop hoh-status-transport-bridge at HoH - kubectl scale deployment hub-of-hubs-status-transport-bridge -n open-cluster-management --replicas 0
  3. stop leaf-hub-status-sync at LH - kubectl scale deployment leaf-hub-status-sync -n open-cluster-management --replicas 0
  4. clean database tables - delete from status.managed_clusters, delete from status.compliance
  5. clean sync service storage - you can use the tool sync-service-simulation-cleaner which uses internally edge-sync-service-client to clean objects that were created during simulation.
  6. start sync service at LH - kubectl scale deployment sync-service-ess -n sync-service --replicas 1
  7. start hoh-status-transport-bridge at HoH - kubectl scale deployment hub-of-hubs-status-transport-bridge -n open-cluster-management --replicas 1
  8. start leaf-hub-status-sync at LH - kubectl scale deployment leaf-hub-status-sync -n open-cluster-management --replicas 1

You have two options to run CLC simulator:

  1. The "create mock-cluster" mode - it creates the mock managed clusters and will keep them alive in case they weren't created before.
  2. The "keep-alive mode" - it brings back the mock managed clusters to the Ready status in case they were created before.

Once all managed clusters are ready you can run GRC simulator to patch policy compliance status periodically.