fix: Add safety-guard for PVE 8 users when activating conntrack-aware migrations mistakenly.

Fixes: #359

.changelogs/1.1.10/359-add-pve8-user-protections-for-conntrack-aware-migrations.yml

@@ -0,0 +1,2 @@
+fixed:
+  - Add safety-guard for PVE 8 users when activating conntrack-aware migrations mistakenly (@gyptazy). [#359]

proxlb/main.py

@@ -19,6 +19,7 @@ from utils.cli_parser import CliParser
 from utils.config_parser import ConfigParser
 from utils.proxmox_api import ProxmoxApi
 from models.nodes import Nodes
+from models.features import Features
 from models.guests import Guests
 from models.groups import Groups
 from models.calculations import Calculations
@@ -80,6 +81,9 @@ def main():
         proxlb_data = {**meta, **nodes, **guests, **pools, **groups}
         Helper.log_node_metrics(proxlb_data)
 
+        # Validate usable features by PVE versions
+        Features.validate_available_features(proxlb_data)
+
         # Update the initial node resource assignments
         # by the previously created groups.
         Calculations.set_node_assignments(proxlb_data)

proxlb/models/features.py

@@ -0,0 +1,90 @@
+"""
+ProxLB Features module for validating and adjusting feature flags
+based on Proxmox VE node versions and cluster compatibility.
+"""
+
+__author__ = "Florian Paul Azim Hoberg <gyptazy>"
+__copyright__ = "Copyright (C) 2025 Florian Paul Azim Hoberg (@gyptazy)"
+__license__ = "GPL-3.0"
+
+
+from typing import List
+from typing import Dict, Any
+from utils.logger import SystemdLogger
+from packaging import version
+
+logger = SystemdLogger()
+
+
+class Features:
+    """
+    ProxLB Features module for validating and adjusting feature flags
+    based on Proxmox VE node versions and cluster compatibility.
+
+    Responsibilities:
+        - Validate and adjust feature flags based on Proxmox VE node versions.
+
+    Methods:
+        __init__():
+            No-op initializer.
+
+        validate_available_features(proxlb_data: dict) -> None:
+            Static method that inspects proxlb_data["nodes"] versions and disables
+            incompatible balancing features for Proxmox VE versions < 9.0.0.
+            This function mutates proxlb_data in place.
+
+    Notes:
+        - Expects proxlb_data to be a dict with "nodes" and "meta" keys.
+    """
+    def __init__(self):
+        """
+        Initializes the Features class.
+        """
+
+    @staticmethod
+    def validate_available_features(proxlb_data: any) -> None:
+        """
+        Validate and adjust feature flags in the provided proxlb_data according to Proxmox VE versions.
+
+        This function inspects the cluster node versions in proxlb_data and disables features
+        that are incompatible with Proxmox VE versions older than 9.0.0. Concretely, if any node
+        reports a 'pve_version' lower than "9.0.0":
+        - If meta.balancing.with_conntrack_state is truthy, it is set to False and a warning is logged.
+        - If meta.balancing.mode equals "psi", meta.balancing.enable is set to False and a warning is logged.
+
+            proxlb_data (dict): Cluster data structure that must contain:
+                - "nodes": a mapping (e.g., dict) whose values are mappings containing a 'pve_version' string.
+                - "meta": a mapping that may contain a "balancing" mapping with keys:
+                    - "with_conntrack_state" (bool, optional)
+                    - "mode" (str, optional)
+                    - "enable" (bool, optional)
+
+            None: The function mutates proxlb_data in place to disable incompatible features.
+
+        Side effects:
+            - Mutates proxlb_data["meta"]["balancing"] when incompatible features are detected.
+            - Emits debug and warning log messages.
+
+        Notes:
+            - Unexpected or missing keys/types in proxlb_data may raise KeyError or TypeError.
+            - Version comparison uses semantic version parsing; callers should provide versions as strings.
+
+        Returns:
+            None
+        """
+        logger.debug("Starting: validate_available_features.")
+
+        any_non_pve9_node = any(version.parse(n['pve_version']) < version.parse("9.0.0") for n in proxlb_data["nodes"].values())
+        if any_non_pve9_node:
+
+            with_conntrack_state = proxlb_data["meta"].get("balancing", {}).get("with_conntrack_state", False)
+            if with_conntrack_state:
+                logger.warning("Non Proxmox VE 9 systems detected: Deactivating migration option 'with-conntrack-state'!")
+                proxlb_data["meta"]["balancing"]["with_conntrack_state"] = False
+
+            psi_balancing = proxlb_data["meta"].get("balancing", {}).get("mode", None)
+            if psi_balancing == "psi":
+                logger.warning("Non Proxmox VE 9 systems detected: Deactivating balancing!")
+                proxlb_data["meta"]["balancing"]["enable"] = False
+
+        logger.debug("Finished: validate_available_features.")