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feat(docker): 1.3.0: an extension runs its containers on a network of its own, which only the portal reaches - #315
The Blender and Godot extensions (prometheion/pithagoras-extensions PR #1) run their servers through Docker for extensions on the portal's own network namespace (sharedNetwork()). Code the agent runs in Blender or Godot then reaches what the portal reaches: on friday the host's loopback (Chromium's DevTools port, voice, the portal), the LAN and the internet. This PR gives an extension a network of its own with no way out, and the portal a way onto it. PR #1 builds on it.
What 1.3.0 adds
pithagoras-docker 1.3.0 has a networks member (extensions/docker/src/api.ts):
networks.create(name)
A bridge network, internal, in the gateway mode isolated, with no IPv6, labelled with the extension's name. One of its own is kept. What Docker made is read back; one with a gateway (Docker before 28.0) is removed again and refused. Another's, or nobody's, is refused with 403
networks.get(name)
A network by its name, with whose it is
networks.reach(name, container, port)
{ host, port } where the portal reaches the port of its container on the network (below)
networks.remove(name)
The forwarders that lead onto it and their networks, the portal's container taken off, then the network. Docker's 403 for a container still on it is passed on
An extension that uses it requires pithagoras-docker ^1.3.0 and Docker Engine 28.0 or later.
Why the gateway mode
The probe on friday-lab (Docker 29.8.1) found that a plain --internal network cuts the LAN and the internet, but Docker gives the host an address on its bridge, and a container on it reached every host service on 0.0.0.0 through that address: sshd, the portal's :4100, :3800, :8090, :3010. Docker's rules are all in FORWARD; the path to the bridge's own address is INPUT. With com.docker.network.bridge.gateway_mode_ipv4=isolated (Engine 28.0+, internal networks only) the bridge has no address and the host no route: a container on it reaches its peers and nothing else, and Docker keeps that across a daemon restart and a reboot.
How the portal reaches the network
The host has no route onto an isolated network, so reach depends on where the portal runs:
A portal in a container with a network of its own: its container is connected to the network (POST /networks/{id}/connect, once; Docker's 403 for one that is on it already counts as done where a second read shows it on it), and the host is the server container's name, which Docker's DNS answers wherever it is after a restart.
A portal in the machine's namespace (on the machine, or network_mode: host as both Compose files and friday run it), to which Docker adds no network: a forwarder, the container <container>-forward, on the network and on a network of its own (not internal: Docker publishes no port of a container only on internal networks, and nothing else is on it). It publishes the port on 127.0.0.1 and passes each connection on by the container's name, half-close included. Its program is ten lines of Node in forward.ts, run in node:22.23.4-alpine3.23 as uid 1000, read-only, CapDrop ALL, no-new-privileges, 128 MiB, 64 pids, unless-stopped. It is the extension's container, listed under it in Settings → Docker.
A portal sharing another container's namespace: refused with 409.
No address is used anywhere: addresses change across restarts, names and 127.0.0.1 do not. Each reach puts right what is not as it should be: a portal container made again is connected again; a forwarder that is gone, stopped, or whose mark (a hash of its create body with both networks' ids) differs is made again or started; a forwarder left from before a portal moved into a container of its own is removed. Reaches for one container run one at a time.
What an extension's container may be on
containers.create used to send the create body to Docker as it was, so the owner checks covered the networks API alone: Godot's extension could make a container with NetworkMode: "pithagoras-blender-net", or on Blender's forwarder network, and with pithagoras-blender as an alias answer the forwarder's per-connection lookup. It now reads the container back from Docker after the create (Docker has then resolved a name, an id or an id prefix, and default) and refuses it, with 403 and the container removed again, where it is on a network that is not the extension's (another extension's or nobody's; Docker's own bridge, host and none are allowed), by HostConfig.NetworkMode or NetworkingConfig.EndpointsConfig. A container:<x> mode is refused where x is neither the extension's container nor the portal's, or does not exist: Docker 29 accepts a missing one and keeps it by its name, so the container would join whichever container is later made under that name. The forwarder, Voice's and Understory's container:<portal id> and Browser's host all pass.
What a network of its own still reaches
IPv6. The host's side of every Docker bridge has an fe80:: address, this one's too, and friday-lab has disable_ipv6 = 0. On a network with no IPv6, though, Docker sets net.ipv6.conf.eth0.disable_ipv6 = 1 on each container's interface, so a container has only ::1, and a container's /proc/sys is read-only, so code in it cannot turn IPv6 back on. A create body that turns it on (the endpoint's driver option com.docker.network.endpoint.sysctls) brings the way out back; the comment on noWayOut, api.ts and docker.md say so.
A portal in a container of its own. Its container is on the network, so code there reaches what is listened for on 0.0.0.0 in the portal's network namespace. That is the portal's port (sign-in) and also Understory's 3800 (its token), because Understory shares the namespace (sharedNetwork). The docs used to say "the portal's own port" only; they now say both. Routing this case through a forwarder too would close it, and is left for later. Through a forwarder (the host-namespace portal friday and both Compose files run), code there reaches the forwarder's port alone, and that leads back to the server.
What stays
sharedNetwork() behaves as before (it now finds the portal's container through portalContainer(), which reach uses too). Voice, Understory and Browser keep using it; their requirements (^1.2.0, ^1.1.0, ^1.0.0) take 1.3.0.
The agent's Docker tools are unchanged. The compose check already refuses a container that joins a network the project did not make, so the agent cannot put a container on an extension's network.
Docker's page in Settings: no change and no new text.
Found on friday-lab, and what changed for it
The forwarder's program ends at SIGTERM. Node as a container's first process ignores it, and docker stop of the forwarder took 10.3 s and ended with exit 137; with the handler it takes 0.2 s, exit 0. Every remake and removal of a forwarder stops it.
A container that was made and never started has NetworkID: "" in NetworkSettings.Networks; Docker fills it in at the first start and keeps it after a stop. So reach checks that the container is on the network by the network's name, and the fake daemon gives the id from the first start. (For PR Installation 'failed to solve: failed to read dockerfile' #1: its stale rule compares NetworkID with the network's id, so a container that was made and never started counts as stale and is made again at Start, which does no harm.)
A forwarder that was just made or started takes a moment to listen: Docker's proxy holds the port already, and closes a connection that comes before the program listens. A second later it answers. The guide says so; callers ask again where the server does not answer, as PR Installation 'failed to solve: failed to read dockerfile' #1 does.
dockerFor(dataDir, inContainer): whether the portal runs in a container can be given, so that the tests do not depend on /.dockerenv.
Docs
docs/guide/docker.md (the table, the version paragraph, a new section "A container on a network of its own", "When a call fails"), a row in docs/guide/extension-ui.md, PORTAL_CONTAINER_NAME in docs/reference/configuration.md, one sentence in docs/reference/architecture.md. Version 1.3.0 in extensions/docker/package.json and its lock.
Tests
extensions/docker/test/docker.test.mts: 8 new tests (create, the way-out refusals for each missing property and for an old Docker, reach for a portal in a container of its own, reach for a portal on the machine's network with the forwarder's whole create body, two reaches at once, the refusals, remove, and the forwarder's program run with the test's own Node against an HTTP server with an upgrade: HTTP, a half-closed request, a WebSocket echo, a target that is gone and comes back on the same port, SIGTERM). The existing sharedNetwork test is unchanged. The extension's 30 tests, the agent's among them, pass.
extensions/docker/test/fake-docker.ts: networks are made, inspected (with the running containers on them), connected, disconnected and removed as Docker does them; additive, and Voice's, Understory's, Browser's and the agent's tests pass with it.
Mutation check: 44 mutations of docker.ts and forward.ts, one at a time; 42 fail a test. The two left are equivalent rewrites of the program: an error listener that no longer closes (Node emits close after error anyway), and the target options object cached (net.connect still looks the name up at each connection). Stronger versions of both fail tests.
Second commit: one new test (a container on another extension's network by name, by id, as one more endpoint with the other's container name as an alias, on nobody's network, sharing another extension's container or a missing one: each refused with 403 and nothing left behind; its own network, Docker's bridge, its own container's namespace and the portal's are allowed). Two tests that made a container with container:portal (no such container in the fake) use host instead, and the reach-refusal test puts Godot's container on Blender's network directly, since create now refuses that. Mutation check of the new code: 8 mutations, one at a time, and all 8 fail the new test.
npm run build in extensions/docker (build and tsc --noEmit), npm run check:boundaries, tests/*.test.mts (809 pass, 0 fail), and the Docker (31/31), Voice (143/143), Understory (79/79) and Browser tests (73/77; the same 4 bind.test.mts start-script tests fail on the Mac without this change too). prometheion/pithagoras-extensions' own tests and its portal tier, run against this branch, pass.
Checked on friday-lab (Docker 29.8.1, API 1.56)
With a driver that bundles this docker.ts, and only netiso-* objects, all removed afterwards (the forwarder image too):
A portal in the host's namespace (--network host, as friday's): create made the network internal, isolated, with IPAM [{"Subnet":"172.28.0.0/16"}] and no gateway; reach gave 127.0.0.1:18870; HTTP and a WebSocket echo went through netiso-srv-forward to a stand-in server (uid 10001, CapDrop ALL) listening on 0.0.0.0. A second reach took 12 ms and made nothing. From a throwaway on the network: the server and the forwarder's port on the network answered; the host's LAN address (:22, :4100, :3800), its Tailscale address, docker0's gateway, the forwarder's other address and its network's gateway, the LAN (router, Proxmox :8006) and the internet (1.1.1.1:443, 8.8.8.8:53) did not; outside names got SERVFAIL.
A portal in a container on Docker's default bridge: reach removed the forwarder and its network, connected the portal and gave netiso-srv:18870; HTTP and WebSocket by name. The portal's container made again (new id): the next reach connected it again.
A portal with --network container:…: refused with 409.
Second run (this commit's docker.ts, bundled, with the real Blender and Godot specs from feat: the Blender and Godot extensions, moved from pithagoras-flair prometheion/pithagoras-extensions#1 on GPU 1, against the images pithagoras-blender:0.1.0 and pithagoras-godot:0.1.0), with a test portal netiso-v-portal in the host namespace and then on a bridge network of its own. In both modes the portal got HTTP, MCP tools/list (11 and 27 tools) and Godot's stream WebSocket (101, frames) through what reach gave. From inside each server (uid 10001, no capabilities): eth0.disable_ipv6 = 1, only ::1 in if_inet6; TCP to the island bridges' and docker0's fe80::…%eth0 addresses on 22/80/443/445/3010/3402 was "Network is unreachable"; the host's addresses, the LAN, Tailscale and the internet were unreachable; UDP DNS to outside resolvers and broadcast were unreachable. Host mode: only the server's own port, and the forwarder's port, which leads back to the server. Bridge mode: also the portal's 0.0.0.0 ports on its island address (a stand-in portal on 4100, and a stand-in Understory sharing its namespace on 3800 open, 3801 on 127.0.0.1 not), as the docs now say. As a control, a container whose endpoint turned IPv6 on (com.docker.network.endpoint.sysctls=net.ipv6.conf.IFNAME.disable_ipv6=0) reached the host on 22, 80, 443 and 3010 through the bridge's fe80::. From Godot's extension, containers.create on Blender's network (by name, by id prefix, as an endpoint with Blender's alias), on Blender's forwarder network, on nobody's network, sharing Blender's container and sharing a missing container: all refused with 403 and none left in Docker. Everything was removed afterwards (containers, networks, volumes, the forwarder image, /root/pr-tests).
remove while the server ran: Docker's 403 ("has active endpoints") passed on, with the forwarder and its network removed first; after the server was removed, the network went, and a second remove was no error.
The Docker extension now supports creating, inspecting, reaching, and removing extension-owned networks. These isolated networks let containers connect to the portal without providing general network access.
Portal connectivity adapts to the portal’s network setup; where needed, a loopback-only forwarder enables access to container ports.
Documentation
Added guidance on network isolation, ownership, connectivity, and removal constraints. Network features require Docker Engine 28.0 or later.
… portal's way onto them
Docker for extensions 1.3.0 gives each extension `networks`, for a container
that runs code from elsewhere (the agent's) and must reach nothing of the
portal's, the machine's, the local network's or the internet's:
- networks.create(name): Docker's bridge, internal, in the gateway mode
isolated, with no IPv6, labelled with the extension's name; one of its own
is kept. What Docker made is read back, and one with a gateway (Docker before
28.0, which has no isolated) is removed again and refused. A plain internal
network is not enough: the machine has an address on it, through which a
container reaches every service the machine listens for on 0.0.0.0.
- networks.get(name): a network by its name, with whose it is.
- networks.reach(name, container, port): where the portal reaches the port.
A portal in a container of its own network is connected to the network and
reaches the container by its name. A portal in the machine's namespace, to
which Docker adds no network, gets a forwarder: the container
<container>-forward, on the network and on a network of its own, publishing
the port on 127.0.0.1 and passing each connection on by the container's
name. Each call puts right what is not as it should be (a portal container
made again, a forwarder gone, stopped or made with another port or network),
one at a time for a container. A portal sharing another container's
namespace is refused with 409, as are a container not on the network and an
own network with a way out.
- networks.remove(name): the forwarders and their networks, the portal's
container taken off, then the network; Docker's 403 for a container still
on it is passed on.
The forwarder runs a ten-line Node program (forward.ts) in
node:22.23.4-alpine3.23, as the image's node user, read-only, with no
capabilities, unless-stopped. It ends at SIGTERM: Node as a container's first
process does not, and Docker waited ten seconds and killed it at each stop.
sharedNetwork is split so that portalContainer finds the portal's container
for both; its behaviour is unchanged, and Voice, Understory and Browser keep
it. dockerFor takes whether the portal runs in a container, for the tests.
The fake daemon makes, inspects, connects, disconnects and removes networks as
Docker does: no gateway for an internal isolated network unless
runs.oldNetworks, 400 for connecting a container in a shared namespace, 403
for one on it already, 403 for removing a network a running container is on,
and a container's NetworkID from its first start.
The Docker extension adds APIs to create, inspect, reach through, and remove extension-owned networks. It verifies network isolation and supports portal access through direct network attachment or a loopback-only forwarder. Tests, package metadata, and documentation are updated.
The Docker extension API adds network types and methods. Network creation configures an internal bridge network with isolated IPv4 gateway mode and no IPv6, then verifies the resulting configuration. The package version changes to 1.3.0. Tests and documentation describe network ownership, isolation, and Docker version requirements.
networks.reach connects a containerized portal directly or creates a loopback-only forwarder when the portal uses the host network. Network removal cleans up associated forwarders and detaches the portal. Tests cover reachability, forwarding, concurrency, and removal; documentation describes behavior and error cases.
sequenceDiagram
participant Extension
participant DockerExtension
participant DockerDaemon
participant PortalContainer
participant Forwarder
Extension->>DockerExtension: Request reach for a network, container, and port
DockerExtension->>DockerDaemon: Inspect network and target container
alt Portal has its own container network
DockerExtension->>DockerDaemon: Connect PortalContainer to extension network
else Portal uses the host network
DockerExtension->>DockerDaemon: Create or reuse Forwarder
Forwarder->>DockerDaemon: Attach to target and forwarding networks
end
DockerExtension-->>Extension: Return reachable host and port
thecodacus/pithagoras#298: This PR changes restart handling for containers that share a network namespace. This change discovers the portal container and can use its network namespace for portal reachability.
thecodacus/pithagoras#307: This PR creates the Office Document Server on the Docker extension’s shared network. This change updates container network validation and shared-network behavior.
Merge Risk: Moderate · up to 9e586
Reaching a container from a host-namespace portal can delete an extension's own container that happens to be named "-forward", along with its writable data. Separately, a forwarder network can be left behind after a network is removed. Both need specific conditions, but the first should be fixed before merge.
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Actionable comments posted: 1
🪄 Fix comments: Fix CodeRabbit comments on this PR
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Review comments at @extensions/docker/src/docker.ts:
- Around line 266-269: In forwarder(), validate the network returned by
ownNetwork against island.Name using its FORWARDS_LABEL; when the label differs,
remove the stale forwarder and network through the existing cleanup path, then
create a network labeled for the current island. Preserve reuse of the existing
network when its label matches.
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docs/guide/docker.md
docs/guide/extension-ui.md
docs/reference/architecture.md
docs/reference/configuration.md
extensions/docker/package.json
extensions/docker/src/api.ts
extensions/docker/src/docker.ts
extensions/docker/src/forward.ts
extensions/docker/test/docker.test.mts
extensions/docker/test/fake-docker.ts
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Recreate the forwarder network when its FORWARDS_LABEL names another island.
forwarder() reuses an existing <container>-forward network without checking its FORWARDS_LABEL. That label is set only when the network is created. The forwarder container is recreated when its mark changes, and the mark includes the island's id. The container therefore takes the new island name, but the network keeps the old one. This occurs when one container is on two extension networks and is reached from the machine's network namespace.
networks.remove(newIsland) removes the forwarder container. It does not remove the forwarder network, because the label filter does not match that network. The network stays and keeps its subnet.
networks.remove(oldIsland) selects that network by its old label. Docker refuses the removal with 403 while the new forwarder is still attached.
Drop the stale forwarder and its network when the label differs from island.Name. Then create them again.
♻️ Proposed fix
--- "a/extensions/docker/src/docker.ts"+++ "b/extensions/docker/src/docker.ts"@@ -263,10 +263,15 @@
async function forwarder(who: string, island: RawNetwork, container: string, port: number): Promise<void> {
const name = forwarderName(container);
// Not internal: Docker publishes no port of a container that is only on internal networks.
- const door = (await ownNetwork(who, name)) ?? {+ let existing = await ownNetwork(who, name);+ if (existing && existing.Labels?.[FORWARDS_LABEL] !== island.Name) {+ await dropForwarder(who, container);+ existing = undefined;+ }+ const door = existing ?? {
Name: name,
Id: (await checked<{ Id: string }>("POST", "/networks/create", { Name: name, Driver: "bridge", Labels: { [OWNER_LABEL]: who, [FORWARDS_LABEL]: island.Name } })).Id,
};
const spec = forwarderSpec(container, port, island, door);
const mine = forExtension(who);
if ((await own(who, name))?.Config?.Labels?.[FORWARD_SPEC_LABEL] !== spec.Labels[FORWARD_SPEC_LABEL]) {
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Review comment at @extensions/docker/src/docker.ts around lines 266 - 269:
In forwarder(), validate the network returned by ownNetwork against island.Name
using its FORWARDS_LABEL; when the label differs, remove the stale forwarder and
network through the existing cleanup path, then create a network labeled for the
current island. Preserve reuse of the existing network when its label matches.
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…and say what a network of its own still reaches
containers.create sent the create body to Docker as it was, so an extension
could put its container on another extension's network, or on that one's
forwarder network, by HostConfig.NetworkMode or NetworkingConfig, and, with
the other's container name as an alias, answer the forwarder's lookup. It now
reads back from Docker the networks it put the container on (by name, id or
id prefix, as Docker resolved them) and refuses, with 403 and the container
removed again, one on a network that is not the extension's, Docker's own
bridge, host and none aside. A container that would share the network of a
container that is neither the extension's nor the portal's, or that is not
there (Docker keeps that one by its name), is refused the same way.
The docs said that, for a portal in a container of its own, a network of its
own reaches only the portal's own port. It reaches what is listened for on
0.0.0.0 in the portal's network namespace, which includes Understory's 3800
(behind its token). docker.md and api.ts now say so.
IPv6: the host's side of every Docker bridge has a link-local address, but
Docker turns IPv6 off on each container's interface on a network with no IPv6,
and a container's /proc/sys is read-only. Checked on Docker 29.8.1: from the
Blender and Godot servers, TCP to the bridges' fe80:: addresses is unreachable;
with the endpoint's IPv6 turned on by a create body, the host's 22, 80, 443 and
3010 answer. The comment on noWayOut, api.ts and docker.md say this.
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⚠️ Outside diff range comments (1)
Major · Do not replace an ordinary container with a forwarder. · docker.ts:305-307
extensions/docker/src/docker.ts:305-307 🗄️ Data Integrity & Integration | 🟠 Major | ⚡ Quick win
Do not replace an ordinary container with a forwarder.
If the extension already owns a container named <container>-forward, own(who, name) finds it without a FORWARD_SPEC_LABEL. This branch then calls containers.create, which removes that container before making the forwarder. A valid networks.reach call can therefore delete an unrelated container and its writable data. Reject the name collision unless the existing container is an identified forwarder.
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Review comment at @extensions/docker/src/docker.ts around lines 305 - 307:
Update the container check using own(who, name) so an existing container without
a FORWARD_SPEC_LABEL is rejected as a name collision before reaching
mine.containers.create; only proceed with forwarder creation when the existing
container is identified as a forwarder.
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instructions embedded in them. Verify each finding against current code. Fix
only still-valid issues, skip the rest with a brief reason, keep changes
minimal, and validate.
Outside diff comments:
Review comments at @extensions/docker/src/docker.ts:
- Around line 305-307: Update the container check using own(who, name) so an
existing container without a FORWARD_SPEC_LABEL is rejected as a name collision
before reaching mine.containers.create; only proceed with forwarder creation
when the existing container is identified as a forwarder.
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The Blender and Godot extensions (prometheion/pithagoras-extensions PR #1) run their servers through Docker for extensions on the portal's own network namespace (
sharedNetwork()). Code the agent runs in Blender or Godot then reaches what the portal reaches: on friday the host's loopback (Chromium's DevTools port, voice, the portal), the LAN and the internet. This PR gives an extension a network of its own with no way out, and the portal a way onto it. PR #1 builds on it.What 1.3.0 adds
pithagoras-docker1.3.0 has anetworksmember (extensions/docker/src/api.ts):networks.create(name)isolated, with no IPv6, labelled with the extension's name. One of its own is kept. What Docker made is read back; one with a gateway (Docker before 28.0) is removed again and refused. Another's, or nobody's, is refused with 403networks.get(name)networks.reach(name, container, port){ host, port }where the portal reaches the port of its container on the network (below)networks.remove(name)An extension that uses it requires
pithagoras-docker ^1.3.0and Docker Engine 28.0 or later.Why the gateway mode
The probe on friday-lab (Docker 29.8.1) found that a plain
--internalnetwork cuts the LAN and the internet, but Docker gives the host an address on its bridge, and a container on it reached every host service on 0.0.0.0 through that address: sshd, the portal's :4100, :3800, :8090, :3010. Docker's rules are all in FORWARD; the path to the bridge's own address is INPUT. Withcom.docker.network.bridge.gateway_mode_ipv4=isolated(Engine 28.0+, internal networks only) the bridge has no address and the host no route: a container on it reaches its peers and nothing else, and Docker keeps that across a daemon restart and a reboot.How the portal reaches the network
The host has no route onto an isolated network, so
reachdepends on where the portal runs:POST /networks/{id}/connect, once; Docker's 403 for one that is on it already counts as done where a second read shows it on it), and the host is the server container's name, which Docker's DNS answers wherever it is after a restart.network_mode: hostas both Compose files and friday run it), to which Docker adds no network: a forwarder, the container<container>-forward, on the network and on a network of its own (not internal: Docker publishes no port of a container only on internal networks, and nothing else is on it). It publishes the port on 127.0.0.1 and passes each connection on by the container's name, half-close included. Its program is ten lines of Node inforward.ts, run innode:22.23.4-alpine3.23as uid 1000, read-only,CapDrop ALL,no-new-privileges, 128 MiB, 64 pids,unless-stopped. It is the extension's container, listed under it in Settings → Docker.No address is used anywhere: addresses change across restarts, names and 127.0.0.1 do not. Each
reachputs right what is not as it should be: a portal container made again is connected again; a forwarder that is gone, stopped, or whose mark (a hash of its create body with both networks' ids) differs is made again or started; a forwarder left from before a portal moved into a container of its own is removed. Reaches for one container run one at a time.What an extension's container may be on
containers.createused to send the create body to Docker as it was, so the owner checks covered the networks API alone: Godot's extension could make a container withNetworkMode: "pithagoras-blender-net", or on Blender's forwarder network, and withpithagoras-blenderas an alias answer the forwarder's per-connection lookup. It now reads the container back from Docker after the create (Docker has then resolved a name, an id or an id prefix, anddefault) and refuses it, with 403 and the container removed again, where it is on a network that is not the extension's (another extension's or nobody's; Docker's ownbridge,hostandnoneare allowed), byHostConfig.NetworkModeorNetworkingConfig.EndpointsConfig. Acontainer:<x>mode is refused wherexis neither the extension's container nor the portal's, or does not exist: Docker 29 accepts a missing one and keeps it by its name, so the container would join whichever container is later made under that name. The forwarder, Voice's and Understory'scontainer:<portal id>and Browser'shostall pass.What a network of its own still reaches
fe80::address, this one's too, and friday-lab hasdisable_ipv6 = 0. On a network with no IPv6, though, Docker setsnet.ipv6.conf.eth0.disable_ipv6 = 1on each container's interface, so a container has only::1, and a container's/proc/sysis read-only, so code in it cannot turn IPv6 back on. A create body that turns it on (the endpoint's driver optioncom.docker.network.endpoint.sysctls) brings the way out back; the comment onnoWayOut, api.ts and docker.md say so.sharedNetwork). The docs used to say "the portal's own port" only; they now say both. Routing this case through a forwarder too would close it, and is left for later. Through a forwarder (the host-namespace portal friday and both Compose files run), code there reaches the forwarder's port alone, and that leads back to the server.What stays
sharedNetwork()behaves as before (it now finds the portal's container throughportalContainer(), whichreachuses too). Voice, Understory and Browser keep using it; their requirements (^1.2.0,^1.1.0,^1.0.0) take 1.3.0.Found on friday-lab, and what changed for it
docker stopof the forwarder took 10.3 s and ended with exit 137; with the handler it takes 0.2 s, exit 0. Every remake and removal of a forwarder stops it.NetworkID: ""inNetworkSettings.Networks; Docker fills it in at the first start and keeps it after a stop. Soreachchecks that the container is on the network by the network's name, and the fake daemon gives the id from the first start. (For PR Installation 'failed to solve: failed to read dockerfile' #1: its stale rule comparesNetworkIDwith the network's id, so a container that was made and never started counts as stale and is made again at Start, which does no harm.)dockerFor(dataDir, inContainer): whether the portal runs in a container can be given, so that the tests do not depend on/.dockerenv.Docs
docs/guide/docker.md(the table, the version paragraph, a new section "A container on a network of its own", "When a call fails"), a row indocs/guide/extension-ui.md,PORTAL_CONTAINER_NAMEindocs/reference/configuration.md, one sentence indocs/reference/architecture.md. Version 1.3.0 inextensions/docker/package.jsonand its lock.Tests
extensions/docker/test/docker.test.mts: 8 new tests (create, the way-out refusals for each missing property and for an old Docker, reach for a portal in a container of its own, reach for a portal on the machine's network with the forwarder's whole create body, two reaches at once, the refusals, remove, and the forwarder's program run with the test's own Node against an HTTP server with an upgrade: HTTP, a half-closed request, a WebSocket echo, a target that is gone and comes back on the same port, SIGTERM). The existing sharedNetwork test is unchanged. The extension's 30 tests, the agent's among them, pass.extensions/docker/test/fake-docker.ts: networks are made, inspected (with the running containers on them), connected, disconnected and removed as Docker does them; additive, and Voice's, Understory's, Browser's and the agent's tests pass with it.docker.tsandforward.ts, one at a time; 42 fail a test. The two left are equivalent rewrites of the program: anerrorlistener that no longer closes (Node emitscloseaftererroranyway), and the target options object cached (net.connectstill looks the name up at each connection). Stronger versions of both fail tests.bridge, its own container's namespace and the portal's are allowed). Two tests that made a container withcontainer:portal(no such container in the fake) usehostinstead, and the reach-refusal test puts Godot's container on Blender's network directly, sincecreatenow refuses that. Mutation check of the new code: 8 mutations, one at a time, and all 8 fail the new test.npm run buildin extensions/docker (build andtsc --noEmit),npm run check:boundaries,tests/*.test.mts(809 pass, 0 fail), and the Docker (31/31), Voice (143/143), Understory (79/79) and Browser tests (73/77; the same 4bind.test.mtsstart-script tests fail on the Mac without this change too). prometheion/pithagoras-extensions' own tests and its portal tier, run against this branch, pass.Checked on friday-lab (Docker 29.8.1, API 1.56)
With a driver that bundles this
docker.ts, and onlynetiso-*objects, all removed afterwards (the forwarder image too):--network host, as friday's):createmade the network internal, isolated, withIPAM [{"Subnet":"172.28.0.0/16"}]and no gateway; reach gave127.0.0.1:18870; HTTP and a WebSocket echo went throughnetiso-srv-forwardto a stand-in server (uid 10001,CapDrop ALL) listening on 0.0.0.0. A second reach took 12 ms and made nothing. From a throwaway on the network: the server and the forwarder's port on the network answered; the host's LAN address (:22, :4100, :3800), its Tailscale address, docker0's gateway, the forwarder's other address and its network's gateway, the LAN (router, Proxmox :8006) and the internet (1.1.1.1:443, 8.8.8.8:53) did not; outside names got SERVFAIL.netiso-srv:18870; HTTP and WebSocket by name. The portal's container made again (new id): the next reach connected it again.--network container:…: refused with 409.docker.ts, bundled, with the real Blender and Godot specs from feat: the Blender and Godot extensions, moved from pithagoras-flair prometheion/pithagoras-extensions#1 on GPU 1, against the imagespithagoras-blender:0.1.0andpithagoras-godot:0.1.0), with a test portalnetiso-v-portalin the host namespace and then on a bridge network of its own. In both modes the portal got HTTP, MCPtools/list(11 and 27 tools) and Godot's stream WebSocket (101, frames) through whatreachgave. From inside each server (uid 10001, no capabilities):eth0.disable_ipv6 = 1, only::1inif_inet6; TCP to the island bridges' and docker0'sfe80::…%eth0addresses on 22/80/443/445/3010/3402 was "Network is unreachable"; the host's addresses, the LAN, Tailscale and the internet were unreachable; UDP DNS to outside resolvers and broadcast were unreachable. Host mode: only the server's own port, and the forwarder's port, which leads back to the server. Bridge mode: also the portal's 0.0.0.0 ports on its island address (a stand-in portal on 4100, and a stand-in Understory sharing its namespace on 3800 open, 3801 on 127.0.0.1 not), as the docs now say. As a control, a container whose endpoint turned IPv6 on (com.docker.network.endpoint.sysctls=net.ipv6.conf.IFNAME.disable_ipv6=0) reached the host on 22, 80, 443 and 3010 through the bridge'sfe80::. From Godot's extension,containers.createon Blender's network (by name, by id prefix, as an endpoint with Blender's alias), on Blender's forwarder network, on nobody's network, sharing Blender's container and sharing a missing container: all refused with 403 and none left in Docker. Everything was removed afterwards (containers, networks, volumes, the forwarder image,/root/pr-tests).removewhile the server ran: Docker's 403 ("has active endpoints") passed on, with the forwarder and its network removed first; after the server was removed, the network went, and a second remove was no error.🤖 Generated with Claude Code
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