Open_Ultra_SAST/ops/ax/README.md

ax on this host

The service plane (.kiro/specs/ai-service-plane/) runs every task on google/ax over Agent Substrate in a single-node kind cluster. ax is the only executor; ousast plane run submits, resumes, starts and collects.

Bring-up

ops/ax/up.sh          # idempotent: kind + registry, Substrate, ax, gVisor worker pool, egress gateway,
                      # receiver Service, runner image (digest pinned), ax CLI, smoke Task
ousast plane doctor   # kind, Substrate, ax controller, runner image
ops/ax/smoke-run.sh   # end to end: repo-facts on ax, artifacts back on the host, attribution table
ops/ax/down.sh        # deletes the cluster and its registry

Tools live in ~/go/bin (kind, ax, ko, kubectl-ate) and ~/.local/bin (kubectl); sources and rendered files in ~/.cache/ousast/ax-src/ (the runner digest pin is runner-image there).

Measured footprint (2026-09-29, idle, two workers)

Item	Value
kind node container memory	1.7 GiB (27% of the 7.7 GiB host)
registry container memory	34 MiB
node volume (images, containerd)	4.9 GB on disk
worker pool	2 gVisor workers, 1 CPU / 1.5 GiB limit each

Disk is the binding constraint: the Substrate install and ko builds need several GB of Go caches. Clear them afterwards (go clean -cache -modcache); rerunning the full Substrate install on a near-full disk fails in ko resolve.

What this host taught (each one cost a failed live run)

• Substrate installs no WorkerPool ("no free workers") -> workerpool.yaml.tmpl.
• Actor images must be pinned by digest; ax's default runner image on gcr.io needs credentials.
• A release ax CLI skews from the server; build it from the deployed checkout.
• ax's API rejects unknown fields; metadata is name + atespace; Git entries have no commit.
• ax apply leaves a Task Suspended until ax resume; the first resume may time out while Substrate builds the template's golden snapshot. ax has no Completed phase: completion is our artifact delivery.
• Substrate boots each template once as a golden actor with the task's env, so the runner waits for a start request sent through atenet-router; the provider key travels only in that request.
• Actor egress goes through the atenet-egress gateway, deny by default, one EgressPolicy per actor, hostnames only; the gateway dials the address the actor connected to, so the receiver is a Service dialled by ClusterIP with its name as Host. The Envoy gateway needs a Rust build; the agentgateway variant needs none.
• Apply a Task after the Workspaces it binds; ax copies them at create time.
• Every Task is its own actor template with a golden actor (~24 MB under /var/lib/ate/actors on the node). Deleting them failed while the snapshot bucket ax's templates name (dberkov-gke-dev3, from AX_SNAPSHOTS_BUCKET) did not exist in rustfs: golden actors piled up in DELETING and filled the disk during a 600-task harvest (2026-10-01). Create that bucket in rustfs (an aws-cli pod with the rustfs-bucket-init env); even then a deleted actor's directory stays on the node, so long Runs need a janitor that removes directories no live actor owns.
• A Workspace's files reach the actor inline in one environment variable: above ~20 KB of content the template fails with "actor template not found" (an 86 KB and a 31 KB excerpt did; 7 KB ran).

Memory store on S3 (MinIO or RustFS)

OUSAST_MEMORY=minio://<bucket>[/<prefix>] puts the plane's memory store (plane/memory.py) in an S3-compatible bucket. MinIO and RustFS both work; the maintainer's server is RustFS. Endpoint and credentials come from .env (MINIO_ENDPOINT, MINIO_ACCESS_KEY, MINIO_SECRET_KEY, MINIO_SECURE, optional MINIO_REGION, which avoids a GetBucketLocation call) and are never printed.

The store never configures its bucket. An admin sets it up once. Each time a MinioStore is opened it checks the setup (MinioStore.verify_bucket), using reads plus one small probe object at <prefix>/_probe/select.jsonl. If anything is missing, it refuses to start with a MemoryStoreError that lists each missing piece and the admin command that fixes it. Nothing is skipped quietly. The store needs:

• versioning Enabled, because provenance cites object version ids;
• an enabled lifecycle rule expiring <prefix>/runs/ (raw run outputs) after a number of days, 30 by default. The rule must be a plain prefix filter, and no rule may expire the whole store (repos/, facts/, index.jsonl and the blobs are kept);
• S3 Select (SelectObjectContent over JSON Lines). Every filtered read is pushed down to the server, and there is no fetch-and-filter fallback. A server without Select (some MinIO releases removed it) is refused;
• object tags readable, because rows are filtered by their kind tag.

One-time admin setup (admin credentials, bucket sast-memory, store at the bucket root):

aws s3api put-bucket-versioning --endpoint-url "$MINIO_ENDPOINT" --bucket sast-memory \
    --versioning-configuration Status=Enabled
aws s3api put-bucket-lifecycle-configuration --endpoint-url "$MINIO_ENDPOINT" --bucket sast-memory \
    --lifecycle-configuration '{"Rules":[{"ID":"ousast-runs-expiry","Status":"Enabled",
      "Filter":{"Prefix":"runs/"},"Expiration":{"Days":30}}]}'

put-bucket-lifecycle-configuration replaces every rule on the bucket, so merge this rule with any rules already there. The agent account's policy can read the bucket's configuration but not change it. It reads and writes objects and their tags, and it gets no Put* on versioning or lifecycle:

{"Version": "2012-10-17", "Statement": [
  {"Effect": "Allow", "Action": ["s3:ListBucket", "s3:GetBucketLocation", "s3:GetBucketVersioning",
                                 "s3:GetLifecycleConfiguration"],
   "Resource": ["arn:aws:s3:::sast-memory"]},
  {"Effect": "Allow", "Action": ["s3:GetObject", "s3:GetObjectVersion", "s3:PutObject", "s3:DeleteObject",
                                 "s3:GetObjectTagging", "s3:PutObjectTagging"],
   "Resource": ["arn:aws:s3:::sast-memory/*"]}]}

Measured state on 2026-10-02 (agent sast-memory-agent): versioning was Enabled and a 30-day rule on runs/ was in place. verify_bucket still refused, because GetObjectTagging returned AccessDenied for the agent.

Known RustFS limit (measured 2026-10-02): Select infers an object's JSON schema from its leading rows. A where field that is missing there, even if row 5000 has it, fails with EvaluatorBindingDoesNotExist instead of matching. The store raises a MemoryStoreError that names the field. It does not answer "no rows", since that answer could silently drop matches.

The real-server contract tests (OUSAST_MEMORY_TEST_MINIO=1, bucket OUSAST_MEMORY_TEST_BUCKET, else MINIO_BUCKET) verify the bucket at its root and write only under a fresh contract-<id>/ prefix. They never configure the bucket.

Moving to a separate Kubernetes cluster (planned)

The maintainer will deploy the plane to its own Kubernetes environment. The manifests under plane/ move as they are; these parts assume this laptop and must change first (checked 2026-09-30):

Assumption	Where	Needed in a real cluster
Artifact receiver runs on the developer host, reached through the ousast-receiver Service with an EndpointSlice to the kind gateway 172.19.0.1:18090	egress.py, receiver-service.yaml.tmpl	the receiver as an in-cluster Deployment (or object storage, e.g. Substrate's S3-compatible store), with the reconciler reading from it
Registry localhost:5001, rewritten by Substrate for kind	up.sh, doctor.py:45, runner digest pin	a registry the workers can pull from; keep digest pins (Substrate rejects tags)
kubectl context kind-$KIND_CLUSTER_NAME	doctor.py:39, egress.py, router.py	one configurable context (for example OUSAST_KUBE_CONTEXT)
ax's snapshot bucket: AX_SNAPSHOTS_BUCKET in ax's deploy/ax-server.yaml points at the ax authors' GCS bucket	ax deploy manifest	your own bucket, set before deploying ax
Egress gateway applied by hand (agentgateway variant, no Rust build)	this README	the Substrate-installed gateway; per-task EgressPolicies work unchanged
Worker pool of 2 x 1 CPU / 1.5 GiB for the 7 GB host	workerpool.yaml.tmpl	sized to the cluster; --workers to match
Plane memory store and results under ~/ousast-results/ on the host	reconciler, memory layer (harnessx-removal Req 6)	a persistent volume or bucket shared by the reconciler

The provider key already travels only in the start request through atenet-router, which works the same through a port-forward to any cluster.

What a larger ax deployment needs

A Kubernetes cluster with Agent Substrate (and its egress gateway), the ax control plane, a registry the workers can pull from, the runner image pinned by digest, the receiver reachable as a Service, and the provider host allowed per task. The manifests under plane/ move unchanged; only OUSAST_ARTIFACT_* and the context change.