fix(cluster_scripts): adjust port allocation to avoid overlap

Adjusted the base port allocation to start from 23000 instead of 32000 to
ensure it does not overlap with the ephemeral port range, which is usually
32768 to 60999. This change helps in preventing potential port conflicts.

Author: mkoura

README.md

@@ -98,6 +98,7 @@ Tests execution can be configured using env variables.
 * `BOOTSTRAP_DIR` – path to a bootstrap dir for the given testnet (genesis files, config files, faucet data) (default: unset)
 * `KEEP_CLUSTERS_RUNNING` – don't stop cluster instances after testrun is finished
   (WARNING: this implies interactive behavior when running tests using the `./.github/regression.sh` script)
+* `PORTS_BASE` - base port number for ports range used by cluster instances (default: 23000)
 
 When running tests using the `./.github/regression.sh` script, you can also use
 

cardano_node_tests/utils/cluster_scripts.py

@@ -169,7 +169,7 @@ def get_instance_ports(self, instance_num: int) -> InstancePorts:
         # Allocate 100 ports per each 15 pools
         ports_per_instance = ((self.num_pools - 1) // 15 + 1) * 100
         offset = instance_num * ports_per_instance
-        base = 32000 + offset
+        base = configuration.PORTS_BASE + offset
         last_port = base + ports_per_instance - 1
         ports_per_node = 5
 

cardano_node_tests/utils/configuration.py

@@ -31,6 +31,10 @@ def _check_cardano_node_socket_path() -> None:
 DBSYNC_DB = "dbsync"
 IS_XDIST = bool(os.environ.get("PYTEST_XDIST_TESTRUNUID"))
 
+# Make sure the ports don't overlap with ephemeral port range. It's usually 32768 to 60999.
+# See `cat /proc/sys/net/ipv4/ip_local_port_range`.
+PORTS_BASE = int(os.environ.get("PORTS_BASE") or 23000)
+
 # Used also in startup scripts as `if [ -n "$VAR" ]...`
 ENABLE_LEGACY = (os.environ.get("ENABLE_LEGACY") or "") != ""
 # Used also in startup scripts as `if [ -n "$VAR" ]...`