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fix(node-agent): R1/R2/R3 — stop deleting deliberately stopped containers

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R1 (critical): _prune_stopped_containers no longer calls containers.prune().
The unfiltered API call removes EVERY non-running container, ignoring
RestartPolicy and compose labels — that is what deleted ollama@solaria 19 s
after an operator `docker stop`. No filter argument can fix it (`until` filters
on creation time, not stop time). Replaced with explicit enumeration over
containers.list(all=True, filters={"status": "exited"}), skipping anything with
restart policy unless-stopped/always/on-failure or a com.docker.compose.project
label. A stopped managed service is recorded operator intent and now belongs to
the module's NEVER TOUCHED list; only one-off leftovers are removed. Dangling
image and build cache prune are unchanged.

R2 (high): _sd_card_rate_ok → _cleanup_rate_ok, applied to every cleanup-
eligible node type. ai_node and standard pruned every 60 s (1440/day, "0 MB
reclaimed" in practically every cycle) with no rate limit at all; they now share
sd_card's CLEANUP_INTERVAL_SECS (24 h) and mark the cleanup timestamp.

R3 (medium): removals are named in the log — WARNING with the container names
when the list is non-empty, INFO otherwise. The old line reported megabytes
only, which is why ollama's deletion looked identical to every no-op cycle.

Tests: services/node-agent/tests/test_safe_cleanup.py (22 cases) — the ollama
regression (exited + unless-stopped survives, prune() never called), all three
restart policies, compose-label protection, disposable-leftover removal, sweep
continues past a failed remove, WARNING-level naming, and the rate limit for
ai_node/standard/sd_card plus lte_node still doing nothing.

Refs docs/incidents/2026-07-30-ollama-solaria-vanish.md §7 R1-R3.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
This commit is contained in:
oskar 2026-08-04 14:55:26 +02:00
parent f6a016f551
commit 0526af1299
2 changed files with 273 additions and 12 deletions
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84
services/node-agent/src/node_agent.py
View file

@ -13,10 +13,10 @@ Runs as a Docker container on every managed node. Each cycle it:
6. Optionally rsyncs events (including action_result) to VPS so the
control-plane observer/executor can process them.
Cleanup policy (matches health-monitor.sh):
Cleanup policy (matches health-monitor.sh). Every type below is additionally
rate-limited to one cleanup run per CLEANUP_INTERVAL_SECS (24 h):
lte_node (chelsty-infra, chelsty-ha) : NO cleanup, NO image operations
sd_card (piha, saturn) : dangling images + stopped containers,
max once per 24 h
sd_card (piha, saturn) : dangling images + stopped containers
ai_node (solaria) : dangling + containers + build cache,
NEVER docker image prune -a
standard (vps) : dangling + containers + build cache +
@ -27,6 +27,9 @@ NEVER TOUCHED on any node:
/opt/homelab/config/ All hand-crafted and repo-seeded configuration
/opt/homelab/state/ Heartbeat files, observer checkpoint
actions/pending|approved|running Live work queue
Stopped containers with a restart policy or a compose project label — a
stopped service is recorded operator intent, not garbage. Container cleanup
enumerates explicitly and never calls the unfiltered containers.prune().
"""
import json
@ -131,7 +134,8 @@ MEM_CRIT_PCT = 95
# that is actually stuck flapping. Configurable via env for tuning per fleet.
CRASH_LOOP_RESTART_THRESHOLD = int(os.getenv("CRASH_LOOP_RESTART_THRESHOLD", "3"))
# SD-card nodes: enforce 24-hour gap between Docker cleanup runs
# Minimum gap between Docker cleanup runs, on EVERY cleanup-eligible node type
# (was sd_card-only until the 2026-07-30 unfiltered-prune incident)
CLEANUP_INTERVAL_SECS = 86_400
LAST_CLEANUP_FILE = STATE_DIR / "last-docker-cleanup"
@ -591,8 +595,14 @@ class NodeAgent:
# Safe Docker cleanup
# ------------------------------------------------------------------
def _sd_card_rate_ok(self) -> bool:
"""Return True only if 24 hours have elapsed since last cleanup."""
def _cleanup_rate_ok(self) -> bool:
"""Return True only if CLEANUP_INTERVAL_SECS has elapsed since last cleanup.
Applies to EVERY cleanup-eligible node type, not just sd_card. Before
R2 this guard covered sd_card alone, so ai_node and standard pruned
every 60 s — 1440 chances a day to delete a deliberately stopped
container, for `0 MB reclaimed` in practically every cycle.
"""
if LAST_CLEANUP_FILE.exists():
try:
last_ts = int(LAST_CLEANUP_FILE.read_text().strip())
@ -623,14 +633,58 @@ class NodeAgent:
logger.error(f"Image prune failed: {exc}")
def _prune_stopped_containers(self):
"""Remove exited containers that are unambiguously disposable.
NEVER uses containers.prune(): the Docker API removes *every*
non-running container, ignoring RestartPolicy and compose labels. That
is what deleted `ollama` on SOLARIA 19 s after an operator stopped it
(docs/incidents/2026-07-30-ollama-solaria-vanish.md). No filter can fix
it either — `until` filters on creation time, not stop time, so it
never protects a long-lived service.
A container carrying `restart: unless-stopped|always|on-failure` or a
compose project label is recorded operator intent, exactly like the
paths in this module's NEVER TOUCHED list. Only one-off leftovers
(restart policy `no`, no compose project) are removed.
"""
if not self.docker_client:
return
try:
result = self.docker_client.containers.prune()
reclaimed = result.get("SpaceReclaimed", 0) // (1024 * 1024)
logger.info(f"Pruned stopped containers ({reclaimed} MB reclaimed)")
containers = self.docker_client.containers.list(
all=True, filters={"status": "exited"}
)
except Exception as exc:
logger.error(f"Container prune failed: {exc}")
logger.error(f"Container list for prune failed: {exc}")
return
removed, kept = [], 0
for c in containers:
try:
policy = (
(c.attrs.get("HostConfig") or {})
.get("RestartPolicy", {})
.get("Name", "")
)
if policy in ("unless-stopped", "always", "on-failure"):
kept += 1 # operator intent — do not touch
continue
if (c.labels or {}).get("com.docker.compose.project"):
kept += 1 # compose-managed — do not touch
continue
c.remove()
removed.append(c.name)
except Exception as exc:
logger.error(f"Failed to remove stopped container {c.name}: {exc}")
# R3: name what was deleted. The old log line reported megabytes only,
# which is why ollama's removal looked identical to every no-op cycle.
if removed:
logger.warning(
f"Removed {len(removed)} disposable stopped container(s): "
f"{', '.join(removed)} (kept {kept} managed)"
)
else:
logger.info(f"No disposable stopped containers (kept {kept} managed)")
def _prune_build_cache(self):
if not self.docker_client:
@ -651,9 +705,14 @@ class NodeAgent:
logger.debug("Skipping Docker cleanup: LTE node")
return
# Rate limit applies to every cleanup-eligible node type (R2). Cleanup
# is housekeeping, not a health function: once per CLEANUP_INTERVAL_SECS
# reclaims the same space as once per minute, at a fraction of the I/O
# and of the exposure to accidental deletion.
if not self._cleanup_rate_ok():
return
if self.node_type == "sd_card":
if not self._sd_card_rate_ok():
return
self._prune_dangling_images()
self._prune_stopped_containers()
# No builder prune: minimise write cycles on SD card
@ -665,6 +724,7 @@ class NodeAgent:
self._prune_dangling_images()
self._prune_stopped_containers()
self._prune_build_cache()
self._mark_cleanup_done()
# ------------------------------------------------------------------
# VPS-specific: control-plane filesystem rotation

201
services/node-agent/tests/test_safe_cleanup.py Normal file
View file

@ -0,0 +1,201 @@
"""Tests for NodeAgent Docker cleanup — regression cover for the 2026-07-30
unfiltered-prune incident (docs/incidents/2026-07-30-ollama-solaria-vanish.md).
`containers.prune()` removes EVERY non-running container, ignoring restart
policy and compose labels; that is what deleted `ollama` on SOLARIA 19 s after
an operator stopped it. These tests pin down the replacement:
R1 — explicit enumeration; a stopped container with `restart: unless-stopped`
or a compose project label is never removed, and prune() is never called.
R2 — the cleanup rate limit applies to ai_node / standard, not sd_card only.
R3 — removals are named in a WARNING log line.
"""
from __future__ import annotations
import time
from unittest.mock import MagicMock
import pytest
import node_agent
# ---------------------------------------------------------------------------
# Fake Docker container helper
# ---------------------------------------------------------------------------
def make_stopped(name, *, restart_policy="no", compose_project=None):
c = MagicMock()
c.name = name
c.status = "exited"
c.attrs = {"HostConfig": {"RestartPolicy": {"Name": restart_policy}}}
c.labels = {"com.docker.compose.project": compose_project} if compose_project else {}
return c
def with_containers(agent, containers):
client = MagicMock()
client.containers.list.return_value = containers
agent.docker_client = client
return client
# ---------------------------------------------------------------------------
# R1 — the incident itself
# ---------------------------------------------------------------------------
def test_unless_stopped_container_survives(agent):
"""THE regression: ollama@solaria — exited, restart=unless-stopped, must live."""
ollama = make_stopped("ollama", restart_policy="unless-stopped")
client = with_containers(agent, [ollama])
agent._prune_stopped_containers()
ollama.remove.assert_not_called()
client.containers.prune.assert_not_called()
@pytest.mark.parametrize("policy", ["unless-stopped", "always", "on-failure"])
def test_every_restart_policy_is_operator_intent(agent, policy):
c = make_stopped("svc", restart_policy=policy)
with_containers(agent, [c])
agent._prune_stopped_containers()
c.remove.assert_not_called()
def test_compose_managed_container_survives(agent):
"""No restart policy, but compose owns it → still off limits."""
c = make_stopped("outline-redis-1", restart_policy="no", compose_project="outline")
with_containers(agent, [c])
agent._prune_stopped_containers()
c.remove.assert_not_called()
def test_disposable_leftover_is_removed(agent):
"""restart=no and no compose project → a one-off leftover, safe to remove."""
c = make_stopped("nervous-shell-42", restart_policy="no")
with_containers(agent, [c])
agent._prune_stopped_containers()
c.remove.assert_called_once()
def test_only_exited_containers_are_enumerated(agent):
"""Running containers must never even enter the candidate list."""
client = with_containers(agent, [])
agent._prune_stopped_containers()
_args, kwargs = client.containers.list.call_args
assert kwargs["all"] is True
assert kwargs["filters"] == {"status": "exited"}
def test_mixed_set_removes_only_the_disposable_one(agent):
keep_policy = make_stopped("ollama", restart_policy="unless-stopped")
keep_compose = make_stopped("umami-db", compose_project="umami")
drop = make_stopped("tmp-build", restart_policy="no")
with_containers(agent, [keep_policy, keep_compose, drop])
agent._prune_stopped_containers()
keep_policy.remove.assert_not_called()
keep_compose.remove.assert_not_called()
drop.remove.assert_called_once()
def test_remove_failure_does_not_abort_the_sweep(agent):
boom = make_stopped("boom", restart_policy="no")
boom.remove.side_effect = RuntimeError("device or resource busy")
later = make_stopped("later", restart_policy="no")
with_containers(agent, [boom, later])
agent._prune_stopped_containers()
later.remove.assert_called_once()
def test_no_docker_client_is_noop(agent):
agent.docker_client = None
agent._prune_stopped_containers() # must not raise
# ---------------------------------------------------------------------------
# R3 — say what was deleted
# ---------------------------------------------------------------------------
def test_removal_is_logged_at_warning_with_names(agent, caplog):
with_containers(agent, [make_stopped("tmp-build", restart_policy="no")])
with caplog.at_level("INFO", logger="node-agent"):
agent._prune_stopped_containers()
warnings = [r for r in caplog.records if r.levelname == "WARNING"]
assert len(warnings) == 1
assert "tmp-build" in warnings[0].message
def test_nothing_removed_stays_at_info(agent, caplog):
with_containers(agent, [make_stopped("ollama", restart_policy="unless-stopped")])
with caplog.at_level("INFO", logger="node-agent"):
agent._prune_stopped_containers()
assert [r for r in caplog.records if r.levelname == "WARNING"] == []
# ---------------------------------------------------------------------------
# R2 — rate limit covers every node type
# ---------------------------------------------------------------------------
@pytest.fixture
def cleanup_calls(agent, monkeypatch):
"""Record which prune helpers run, without touching Docker."""
calls = []
for helper in ("_prune_dangling_images", "_prune_stopped_containers",
"_prune_build_cache"):
monkeypatch.setattr(agent, helper, lambda h=helper: calls.append(h))
return calls
@pytest.fixture
def fresh_cleanup_marker(tmp_path, monkeypatch):
monkeypatch.setattr(node_agent, "LAST_CLEANUP_FILE", tmp_path / "last-docker-cleanup")
return node_agent.LAST_CLEANUP_FILE
@pytest.mark.parametrize("node_type", ["ai_node", "standard", "sd_card"])
def test_recent_cleanup_blocks_next_run(agent, cleanup_calls, fresh_cleanup_marker,
node_type):
"""Was true for sd_card only; after R2 it holds for ai_node and standard too."""
agent.node_type = node_type
fresh_cleanup_marker.write_text(str(int(time.time())))
agent.run_safe_cleanup()
assert cleanup_calls == []
@pytest.mark.parametrize("node_type,expected", [
("ai_node", ["_prune_dangling_images", "_prune_stopped_containers",
"_prune_build_cache"]),
("standard", ["_prune_dangling_images", "_prune_stopped_containers",
"_prune_build_cache"]),
("sd_card", ["_prune_dangling_images", "_prune_stopped_containers"]),
])
def test_stale_marker_allows_cleanup_and_is_refreshed(agent, cleanup_calls,
fresh_cleanup_marker,
node_type, expected):
agent.node_type = node_type
stale = int(time.time()) - node_agent.CLEANUP_INTERVAL_SECS - 1
fresh_cleanup_marker.write_text(str(stale))
agent.run_safe_cleanup()
assert cleanup_calls == expected
# Marker refreshed for every type, otherwise the guard never engages.
assert int(fresh_cleanup_marker.read_text()) > stale
def test_lte_node_still_does_nothing(agent, cleanup_calls, fresh_cleanup_marker):
agent.node_type = "lte_node"
agent.run_safe_cleanup()
assert cleanup_calls == []
assert not fresh_cleanup_marker.exists()