fix(docker): configure the attributed gateway subnet

.gitea/workflows/pre-release-test.yml

@@ -60,6 +60,9 @@ jobs:
 
   integration-docker:
     runs-on: ubuntu-latest
+    concurrency:
+      group: integration-docker-infra
+      cancel-in-progress: false
     steps:
       - name: Checkout
         uses: actions/checkout@v4

.gitea/workflows/test.yml

@@ -81,6 +81,9 @@ jobs:
 
   integration-docker:
     runs-on: ubuntu-latest
+    concurrency:
+      group: integration-docker-infra
+      cancel-in-progress: false
     steps:
       - name: Checkout
         uses: actions/checkout@v4

bot_bottle/backend/docker/gateway.py

@@ -17,6 +17,10 @@ from ...gateway import (
   DEFAULT_CA_TIMEOUT_SECONDS, CA_POLL_SECONDS, GATEWAY_CA_CERT, GatewayError
 )
 
+DEFAULT_GATEWAY_SUBNET = "10.242.255.0/24"
+_GATEWAY_SUBNET_LABEL = "bot-bottle.gateway-subnet"
+
+
 class DockerGateway(Gateway):
     """The consolidated gateway as a single, fixed-name Docker container.
 
@@ -36,6 +40,7 @@ class DockerGateway(Gateway):
         dockerfile: str | None = GATEWAY_DOCKERFILE,
         host_port_bindings: tuple[int, ...] = (),
         ca_mount_source: str | Path | None = None,
+        subnet: str | None = None,
     ) -> None:
         self.image_ref = image_ref
         self.name = name
@@ -60,6 +65,11 @@ class DockerGateway(Gateway):
         # backend's dev-harness gateway so VMs can reach it via their TAP link;
         # Docker's DNAT + the nft `ct status dnat accept` rule handle the rest.
         self._host_port_bindings = host_port_bindings
+        self._subnet = (
+            subnet
+            or os.environ.get("BOT_BOTTLE_DOCKER_GATEWAY_SUBNET", "").strip()
+            or DEFAULT_GATEWAY_SUBNET
+        )
         configured_ca = os.environ.get("BOT_BOTTLE_DOCKER_CA_MOUNT", "").strip()
         self._ca_mount_source = str(
             ca_mount_source or configured_ca or host_gateway_ca_dir()
@@ -114,10 +124,34 @@ class DockerGateway(Gateway):
     def _ensure_network(self) -> None:
         """Create the shared gateway network if it doesn't exist. Idempotent —
         a concurrent create loses harmlessly (the loser sees 'already exists').
-        Docker picks the subnet; the launcher reads it back to allocate IPs."""
-        if run_docker(["docker", "network", "inspect", self.network]).returncode == 0:
-            return
-        proc = run_docker(["docker", "network", "create", self.network])
+        The explicit subnet is required because bottle attribution pins source
+        IPs; Docker rejects static endpoint addresses on an auto-IPAM network."""
+        inspected = run_docker([
+            "docker", "network", "inspect",
+            "--format", f'{{{{index .Labels "{_GATEWAY_SUBNET_LABEL}"}}}}',
+            self.network,
+        ])
+        if inspected.returncode == 0:
+            marker = inspected.stdout.strip()
+            if marker in {"", self._subnet}:
+                return
+        if inspected.returncode == 0:
+            # Migrate the stale auto-IPAM network created by older releases.
+            # Removing the fixed gateway is safe here: this launch recreates it.
+            run_docker(["docker", "rm", "--force", self.name])
+            removed = run_docker(["docker", "network", "rm", self.network])
+            if removed.returncode != 0:
+                raise GatewayError(
+                    f"gateway network {self.network} needs explicit subnet "
+                    f"{self._subnet} but could not be replaced: "
+                    f"{removed.stderr.strip()}"
+                )
+        proc = run_docker([
+            "docker", "network", "create",
+            "--subnet", self._subnet,
+            "--label", f"{_GATEWAY_SUBNET_LABEL}={self._subnet}",
+            self.network,
+        ])
         if proc.returncode != 0 and "already exists" not in proc.stderr:
             raise GatewayError(
                 f"gateway network {self.network} failed to create: {proc.stderr.strip()}"
@@ -148,9 +182,9 @@ class DockerGateway(Gateway):
         # Recreate when the running container's image is stale (a rebuild),
         # so source changes to the gateway's flat daemons take effect — not
         # just when the container is absent.
+        self._ensure_network()
         if self.is_running() and self._running_image_is_current():
             return
-        self._ensure_network()
         # Clear any stale (stopped OR outdated-image) container holding the
         # fixed name, then start fresh. `rm --force` on an absent name is a
         # tolerated no-op.

docs/ci.md

@@ -12,6 +12,10 @@ reaches control-plane siblings through the job's Docker network and uses named
 Docker volumes for orchestrator/CA state the host daemon must mount. The
 orchestrator runs the package baked into the image built from the checkout; it
 does not bind the job container's invisible workspace into a sibling container.
+Docker integration jobs share fixed singleton names, so required and manual
+runs use one non-cancelling concurrency group. The shared agent/gateway network
+has an explicit subnet, which Docker requires for the pinned source IPs used as
+the isolation/attribution key.
 
 `scripts.unittest_gate` enforces the Docker job's contract: all 22 integration
 tests must execute and none may skip. This includes the real gateway-image,

tests/unit/test_orchestrator_gateway.py

@@ -7,7 +7,10 @@ import unittest
 from pathlib import Path
 from unittest.mock import Mock, patch
 
-from bot_bottle.backend.docker.gateway import DockerGateway
+from bot_bottle.backend.docker.gateway import (
+    DEFAULT_GATEWAY_SUBNET,
+    DockerGateway,
+)
 from bot_bottle.gateway import (
     GATEWAY_CA_CERT,
     GATEWAY_NAME,
@@ -209,7 +212,38 @@ class TestDockerGateway(unittest.TestCase):
         with patch(_RUN_DOCKER, side_effect=fake):
             self.sc.connect_to_orchestrator(_ORCH_URL, _TOKEN)
         creates = [c for c in calls if c[:3] == ["docker", "network", "create"]]
-        self.assertEqual([["docker", "network", "create", self.sc.network]], creates)
+        self.assertEqual(
+            [[
+                "docker", "network", "create",
+                "--subnet", DEFAULT_GATEWAY_SUBNET,
+                "--label",
+                f"bot-bottle.gateway-subnet={DEFAULT_GATEWAY_SUBNET}",
+                self.sc.network,
+            ]],
+            creates,
+        )
+
+    def test_ensure_running_replaces_stale_auto_ipam_network(self) -> None:
+        calls: list[list[str]] = []
+
+        def fake(argv: list[str], **_kw: object) -> Mock:
+            calls.append(argv)
+            if argv[:2] == ["docker", "ps"]:
+                return _proc(stdout="")
+            if argv[:3] == ["docker", "network", "inspect"]:
+                return _proc(stdout="<no value>\n")
+            return _proc()
+
+        with patch(_RUN_DOCKER, side_effect=fake):
+            self.sc.connect_to_orchestrator(_ORCH_URL, _TOKEN)
+        self.assertIn(
+            ["docker", "rm", "--force", self.sc.name],
+            calls,
+        )
+        self.assertIn(
+            ["docker", "network", "rm", self.sc.network],
+            calls,
+        )
 
     def test_ca_cert_pem_reads_from_container(self) -> None:
         with patch(_RUN_DOCKER, return_value=_proc(stdout=_CA_PEM)) as m: