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The L2-anchor spec's behavioral guarantee — an idle link stays silent for 5 s once the enslavement burst settles — only ran in the Dynamips and Docker suites. It now also runs in QEMU, IOU, the IOL container, the switch fast path and the switch cascade, which covers every host-device creation path: * tap create (Dynamips/QEMU/IOU anchors), docker create_veth (Docker host ends; the cascade's race-loser end is hardened after create by the server), bridge add_nio_tap (the IOL container anchor, the fifth creator), and the brctl switch bridges, whose multicast snooping is off precisely so the bridge role can reach silence; * each scenario silences its guests first (IOS interfaces shut through the console; Docker guests' links down) and re-verifies the ping after; * the cascade measures 8 devices at once (four absorbed router anchors, both cascade ends, both switch bridges). IOL 158 s, cascade 293 s, ESW fast path 378 s, QEMU 428 s, IOU 308 s — all green.
132 lines
7.6 KiB
Markdown
132 lines
7.6 KiB
Markdown
<!--
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SPDX-License-Identifier: CC-BY-SA-4.0
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See LICENSE file for licensing information.
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-->
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# Live end-to-end tests
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Tests under this directory run against a **real** server: real uBridge, real
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kernel interfaces (privileged), real emulator binaries and real images. They
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verify what unit tests cannot — that a datapath actually forwards traffic,
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that kernel bridges actually enslave anchors, that tc impairments actually
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shape packets. They are marked `e2e` and **excluded from normal test runs**
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(see `tests/pytest.ini`); run them explicitly:
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```bash
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pytest -m e2e tests/e2e -s # -s shows the progress prints
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pytest -m e2e tests/e2e -k dynamips # one scenario
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```
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Two run modes, chosen per test through `harness.live_server(kernel=...)`:
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* **Target an existing server** — set `GNS3_E2E_URL` (e.g.
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`http://127.0.0.1:3080/v3`, plus `GNS3_E2E_USER`/`GNS3_E2E_PASSWORD`,
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default admin/admin). The server must already be configured for the
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datapath under test (kernel links need `enable_kernel_datapath = True`).
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* **Isolated instance** (the default) — the harness starts its own server
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process on a free port with its own config directory (the controller DB
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and every path follow the config), so nothing on the machine is touched.
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It needs `ubridge`, `dynamips` and an images directory
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(`GNS3_E2E_IMAGES`, default `~/GNS3/images`) available locally — the IOU
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scenario takes its L3 image from that directory's `IOU` subfolder, the
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QEMU scenario its L3 IOSv qcow2 from the `QEMU` subfolder; the Docker
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scenarios additionally need the Docker daemon the server talks to.
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Either way each test creates its own project and deletes it again. Set
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`GNS3_E2E_KEEP=1` to keep the project (and a started instance) on failure
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and print where to look at it.
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The dynamips scenarios give their routers an idle-PC: detected once per
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image through the controller's `auto_idlepc` (a throwaway project and a
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real CPU-usage measurement — the GUI's idle-PC finder path) and cached in
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`~/.cache/gns3-e2e/idlepc.json` keyed by the image checksum. Without one,
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each c7200 burns a **full CPU core** for the whole scenario — the e2e
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creates raw nodes, so no template supplies a value. Set `GNS3_E2E_IDLEPC`
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to skip the detection and use the given value (detection failing is never
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fatal: the routers simply run without one).
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`harness.py` holds the shared pieces — REST client, server lifecycle, the
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IOS console driver, the Docker guest driver (a tiny Docker Engine API
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client over the daemon socket, plus the digest-pinned image helper), a
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WebSocket notification collector (a sync facade over `websockets`' sync
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client for asserting on live notification streams), host-side kernel
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inspections (bridge membership, tap admin state, tc qdiscs, the L2-anchor
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spec §E assertions) — so a new node type adds only its own scenario module.
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Current scenarios:
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* `test_dynamips_kernel_datapath.py` — two real c7200 routers: kernel link
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(anchors, per-link bridge, netem delay, suspend, capture, delete/re-create,
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stop/start) plus a serial link staying on the relay, and a negative
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control on an isolated relay-configured instance.
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* `test_ethernet_switch_kernel_datapath.py` — a real Ethernet switch
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(kernel bridge) between two c7200 routers: deferred joins on boot, VLAN
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isolation, absorbed-anchor filters/suspend/capture, VPCS peers staying on
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the relay, and a relay negative control.
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* `test_ethernet_switch_cascade.py` — two Ethernet switches cascaded through
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the link-owned veth pair (`gs<link_id>0/1`, each end enslaved into its own
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switch's bridge): a dot1q trunk cascade carrying two VLANs at once across
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two c7200 routers per switch, the symmetric access/trunk mode flip on the
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cascade ends, two-sided netem (one end per direction), suspend, link
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delete/re-create (the pair dies with the link, the replacement mints new
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names), zero residue.
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* `test_iol_docker_kernel_datapath.py` — two real iol-xe containers (Cisco
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CML iol-runner images): kernel link through the port bridge's swappable
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TAP leg (anchors at start, netem delay, the TAP-anchor classifier spot
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check for bpf match-drop and the eBPF every-nth mode, suspend, capture,
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link delete/re-create swap, node stop/start rewiring) and a relay
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negative control.
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* `test_iou_kernel_datapath.py` — two real IOU routers (a real IOU image
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from the images directory, the real IOS CLI on the server's telnet
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console): kernel link through the [IOL fabric ↔ TAP] port bridge (same
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lifecycle as the iol-xe containers) including the TAP-anchor classifier
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spot check and a filter surviving a node restart, a serial link staying
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on the relay (serial bays never anchor), and a relay negative control
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whose filters ride the IOU-specific `iol_bridge add_packet_filter` engine
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(delay and frequency_drop measured through real traffic).
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* `test_qemu_kernel_datapath.py` — two real IOSv routers (a real qcow2
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image from the images directory's `QEMU` subfolder, linked clone, the
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real IOS CLI on the server's telnet console): the anchor TAP is QEMU's
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own netdev (no port bridge in between) — the full kernel lifecycle plus
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a relay negative control where the anchor carries as the relay's
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AF_PACKET endpoint. IOSv boots a real IOS: this is the slowest scenario
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pair (~6½ min kernel, ~5 min relay).
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* `test_docker_kernel_datapath.py` — two real Alpine containers (the plain
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veth datapath): the per-link kernel bridge enslaves exactly the two veth
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host ends, real ICMP crosses, the filter matrix runs one type at a time
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(netem core and extensions, cls_bpf match-drop, the eBPF classifier —
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each measured through real traffic), plus a relay negative control whose
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own filters (delay, frequency_drop, bpf) really shape the wire as uBridge
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userspace bridge filters, and a relay→kernel reopen upgrade (the server's
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datapath choice is flipped across a restart).
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* `test_marker_kernel_datapath.py` — two real Alpine containers on a
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kernel-only link with traffic-insight markers attached to a veth anchor
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(`marker add_kernel`): `marker.match` signals collected off the dedicated
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marker WebSocket with their full identity (filter/tag/link_id/node_id/len
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and the tx/rx direction set of a ping), the main project channel asserted
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free of matches, BPF and direction enforcement, host pcap exactness,
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pause/resume silence counting against a still-firing sibling, tag replay
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(timeline, display filter, link narrowing, window, the 409 gate) and
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marker delete taking pcap plus signals with it.
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The Docker scenarios run a digest-pinned `alpine:3`, so every developer
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tests the same bytes: a cached copy in the local Docker daemon costs no
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network, a cache miss pulls through the server's own image-pull route, and
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with neither cache nor registry the scenario skips (`GNS3_E2E_DOCKER_IMAGE`
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overrides the reference). Their guests are addressed the way a GNS3 user
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does it — the node's persistent `/etc/network/interfaces`, which the
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container's `init.sh` applies at boot — and driven through the Docker
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daemon socket the server itself uses.
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Every kernel scenario also asserts the L2-anchor spec's server-side
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guarantees (`docs/design/ubridge-l2-anchor-spec.md` §E): anchors and bridges
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carry no L3 identity (`assert_pure_l2`), joined ports are FORWARDING
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(`assert_forwarding`), and an idle link with the guests silenced stays
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silent for 5 s (`assert_idle_silence`) — the guests are the IOS consoles'
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interfaces shut, the Docker guests' links down, or all four cascade routers
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silenced, whichever the scenario runs. These skip on a uBridge without
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`link l2only` (probed once by `harness.l2only_supported()`).
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Set `GNS3_E2E_DEBUG=1` to run the isolated instance with debug logging (the
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uBridge command stream lands in its `server.log`).
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