IPFS daemon cannot start multicast-listener on boot (as service)

[RubenKelevra]

Description:

Looks like the daemon starts too early, while After=network.target in [Unit] for the systemd service is set. This is a desktop system, so Network-Manager handles the wifi connections.

The issue here is not that the multicast-listener cannot be started, but that it's not just deferred until it's possible.

Log

Mär 28 20:41:15 i3 systemd[1]: Started InterPlanetary File System (IPFS) daemon.
Mär 28 20:41:16 i3 ipfs[1082]: Initializing daemon...
Mär 28 20:41:16 i3 ipfs[1082]: go-ipfs version: 0.5.0-dev-3561de074
Mär 28 20:41:16 i3 ipfs[1082]: Repo version: 9
Mär 28 20:41:16 i3 ipfs[1082]: System version: amd64/linux
Mär 28 20:41:16 i3 ipfs[1082]: Golang version: go1.14.1
Mär 28 20:41:17 i3 ipfs[1082]: 2020-03-28T20:41:17.381+0100        ERROR        p2pnode        libp2p/discovery.go:46        mdns error: No multicast listeners could be started
Mär 28 20:41:17 i3 ipfs[1082]: github.com/ipfs/go-ipfs/core/node/libp2p.SetupDiscovery.func1
Mär 28 20:41:17 i3 ipfs[1082]:         /home/ruben/.cache/yay/go-ipfs-git/src/go-ipfs/core/node/libp2p/discovery.go:46
Mär 28 20:41:17 i3 ipfs[1082]: reflect.Value.call
Mär 28 20:41:17 i3 ipfs[1082]:         /usr/lib/go/src/reflect/value.go:460
Mär 28 20:41:17 i3 ipfs[1082]: reflect.Value.Call
Mär 28 20:41:17 i3 ipfs[1082]:         /usr/lib/go/src/reflect/value.go:321
Mär 28 20:41:17 i3 ipfs[1082]: go.uber.org/dig.(*Container).Invoke
Mär 28 20:41:17 i3 ipfs[1082]:         /home/ruben/go/pkg/mod/go.uber.org/dig@v1.8.0/dig.go:397
Mär 28 20:41:17 i3 ipfs[1082]: go.uber.org/fx.(*App).executeInvokes
Mär 28 20:41:17 i3 ipfs[1082]:         /home/ruben/go/pkg/mod/go.uber.org/fx@v1.10.0/app.go:649
Mär 28 20:41:17 i3 ipfs[1082]: go.uber.org/fx.New
Mär 28 20:41:17 i3 ipfs[1082]:         /home/ruben/go/pkg/mod/go.uber.org/fx@v1.10.0/app.go:435
Mär 28 20:41:17 i3 ipfs[1082]: github.com/ipfs/go-ipfs/core.NewNode
Mär 28 20:41:17 i3 ipfs[1082]:         /home/ruben/.cache/yay/go-ipfs-git/src/go-ipfs/core/builder.go:24
Mär 28 20:41:17 i3 ipfs[1082]: main.daemonFunc
Mär 28 20:41:17 i3 ipfs[1082]:         /home/ruben/.cache/yay/go-ipfs-git/src/go-ipfs/cmd/ipfs/daemon.go:339
Mär 28 20:41:17 i3 ipfs[1082]: github.com/ipfs/go-ipfs-cmds.(*executor).Execute
Mär 28 20:41:17 i3 ipfs[1082]:         /home/ruben/go/pkg/mod/github.com/ipfs/go-ipfs-cmds@v0.1.4/executor.go:77
Mär 28 20:41:17 i3 ipfs[1082]: github.com/ipfs/go-ipfs-cmds/cli.Run
Mär 28 20:41:17 i3 ipfs[1082]:         /home/ruben/go/pkg/mod/github.com/ipfs/go-ipfs-cmds@v0.1.4/cli/run.go:137
Mär 28 20:41:17 i3 ipfs[1082]: main.mainRet
Mär 28 20:41:17 i3 ipfs[1082]:         /home/ruben/.cache/yay/go-ipfs-git/src/go-ipfs/cmd/ipfs/main.go:169
Mär 28 20:41:17 i3 ipfs[1082]: main.main
Mär 28 20:41:17 i3 ipfs[1082]:         /home/ruben/.cache/yay/go-ipfs-git/src/go-ipfs/cmd/ipfs/main.go:72
Mär 28 20:41:17 i3 ipfs[1082]: runtime.main
Mär 28 20:41:17 i3 ipfs[1082]:         /usr/lib/go/src/runtime/proc.go:203
Mär 28 20:41:17 i3 ipfs[1082]: Swarm listening on /ip4/127.0.0.1/tcp/4001
Mär 28 20:41:17 i3 ipfs[1082]: Swarm listening on /ip6/::1/tcp/4001
Mär 28 20:41:17 i3 ipfs[1082]: Swarm listening on /p2p-circuit
Mär 28 20:41:17 i3 ipfs[1082]: Swarm announcing /ip4/127.0.0.1/tcp/4001
Mär 28 20:41:17 i3 ipfs[1082]: Swarm announcing /ip6/::1/tcp/4001
Mär 28 20:41:17 i3 ipfs[1082]: API server listening on /ip4/127.0.0.1/tcp/5001
Mär 28 20:41:17 i3 ipfs[1082]: WebUI: http://127.0.0.1:5001/webui
Mär 28 20:41:17 i3 ipfs[1082]: Gateway (readonly) server listening on /ip4/127.0.0.1/tcp/8080
Mär 28 20:41:17 i3 ipfs[1082]: Daemon is ready

[Stebalien]

Our current mdns library is hopelessly broken, unfortunately. See libp2p/go-libp2p#623.

But yeah, we also need to react to interface changes.

[RubenKelevra]

Well, it's kind of hard to find those stuff before opening a bug here... since IPFS is segmented in such many repositories and the Github search can't search on a project level - just globally or repository based :/

[Stebalien]

I agree, I'm sorry. We're trying to keep most top-level issues to go-ipfs and go-libp2p at this point. Also, this particular issue hasn't been captured there.

[RubenKelevra]

Well, that's more a GitHub limitations than everything else :)

[RubenKelevra]

I casually reached out to GitHub via Twitter. Hope they do implement this soon. :)

https://twitter.com/GitHubHelp/status/1245367922891067394?s=19