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Infrastructure Config

Python Environment

Python3.10 should be installed to support the running of DesFaaS in the master VM and worker VMs, and related dependencies should be installed. In master VM, the dependencies is in requirements_master.txt, while worker VMs in requirements_worker.txt

Worker VMs

To run DesFaaS, every worker VM needs to meet such conditions:

  • CRI-O is deployed as the basic container runtime.
  • The checkpoint/restore(C/R) capacity of CRI-O is active.
  • CRI-O version is greater than 1.25.
  • The Buildah tool is installed as an image build tool.
  • Shared disk among VMs of one physical machine is configured.

Kubernetes

In order to use DesFaaS, the Kubernetes cluster needs to meet such conditions:

  • OpenFaaS is deployed as the basic serverless runtime.
  • CAdvisor, Node-exporter, Kube-metrics, and Prometheus are deployed and configured to monitor cluster information DesFaaS requires.
  • The checkpoint capacity of Kubernetes is active.
  • The Kubernetes version is greater than 1.25.

External Infrastructure

Desfaas requires the following external infrastructure:

  • Disk of an external server is required as state external storage.
  • An external image repository is required to store function runtime images.

DesFaaS Config

The config.py must be modified to meet the cluster config and other infrastructures on which DesFaaS relies. Here are the related global parameters.

Global Variable Name Meaning Type
MASTRE_IP The IP address of the master node of kubernetes string
CLUSTER_CONFIG The IP and corresponding server name of worker nodes dict
CLUSTER_SETTINGS The shared disk config about with CLUSTER_CONFIG dict
NAMESPACE The Kubernetes namespace where the stateful functions are running string
PROMETHEUS The path of Prometheus string
FUNCTION_CONFIG_PATH The path of OpenFaaS stateful function config YAML file string
FUNCTION_CONFIG_PATH the path to store the OpenFaaS YAML files string
WORKER_NODES_USERNAME The user name of worker nodes string
WORKER_NODES_PASSWORD The password of worker nodes string
WORKER_NODES_PORT The SSH connection port of worker nodes int
WORKER_STATE_DISK_PATH The shared disk path in worker nodes string
WORKER_CHECKPOINT_DISK_PATH The path to store checkpoint files in worker nodes string
EXTERNAL_IMAGE_STORAGE The URL of external image storage string
EXTERNAL_STATE_SERVER_IP The IP of state external storage server string
EXTERNAL_STATE_SERVER_USERNAME The username of state external storage server string
EXTERNAL_STATE_SERVER_PASSWORD The password of the state external storage server string
PORT The SSH port of the state external storage server int
EXTERNAL_STATE_SERVER_STORAGE_PATH The storage path of state external storage server string

DesFaaS Deployment

After completing the above configuration, DesFaaS can be used. The modified source code of DesFaaS needs to be copied to the master VM and each worker VM, and run the components of DesFaaS on the corresponding ports in the corresponding VM:

conponent name port Introduction runnninga location
state monitor 8053 Monitor and schedule global state messages. master VM
state manager 8054 Manage local state replicas. worker VM
migration monitor 8055 Monitor cluster and function information. master VM
migration decision-maker / Make migration decisions for local functions. worker VM
migration scheduler 8051 Coordinate the entire process of migration decisions. master VM
migration excutor 8052 Perform specific migration operations on the worker nodes. worker VM