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Added an Initial version of a NGINX demo #1451

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Added an Initial version of a NGINX demo #1451

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dzobbe
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@dzobbe dzobbe commented Dec 15, 2023 •
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Hi all,

I started to work on the setup of a NGINX demo in Occlum. Unfortunately, it still does not work completely. I addressed many startup errors and now the servers starts. However, when a client request is made, the clients connect to the server but it hangs.

It seems this is the issue:

[2023-12-15T13:06:18.256Z][TRACE][T2][#7824][···Write] Retval = 0x2c
[2023-12-15T13:06:18.256Z][TRACE][T2][#7825][RtSigsuspend] Syscall { num = RtSigsuspend }
[2023-12-15T13:06:18.256Z][ERROR][T2][#7825][RtSigsuspend] Error = ENOSYS (#38, Function not implemented): Unimplemented or unknown syscall [line = 1017, file = src/syscall/mod.rs]
[2023-12-15T13:06:18.256Z][TRACE][T2][#7825][RtSigsuspend] Retval = 0xffffffffffffffda
[2023-12-15T13:06:18.256Z][TRACE][T2][#7826][ClockGettime] Syscall { num = ClockGettime, clockid = 0, ts_u = 0x7f09543ff960 }
[2023-12-15T13:06:18.256Z][TRACE][T2][#7826][ClockGettime] Retval = 0x0
[2023-12-15T13:06:18.256Z][TRACE][T2][#7827][ClockGettime] Syscall { num = ClockGettime, clockid = 1, ts_u = 0x7f09543ff980 }
[2023-12-15T13:06:18.256Z][TRACE][T2][#7827][ClockGettime] Retval = 0x0
[2023-12-15T13:06:18.256Z][TRACE][T2][#7828][···Write] Syscall { num = Write, fd = 4, buf = 0x7f09543ff150, size = 50 }
[2023-12-15T13:06:18.256Z][DEBUG][T2][#7828][···Write] write: fd: 4
[2023-12-15T13:06:18.256Z][TRACE][T2][#7828][···Write] Retval = 0x32
[2023-12-15T13:06:18.257Z][TRACE][T2][#7829][···Write] Syscall { num = Write, fd = 4, buf = 0x7f09543ff150, size = 44 }
[2023-12-15T13:06:18.257Z][DEBUG][T2][#7829][···Write] write: fd: 4
[2023-12-15T13:06:18.257Z][TRACE][T2][#7829][···Write] Retval = 0x2c
[2023-12-15T13:06:18.257Z][TRACE][T2][#7830][RtSigsuspend] Syscall { num = RtSigsuspend }

I would like to have some help :)

Cheers.

@qzheng527
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@dzobbe By my undestanding, the nginx uses fork which is not supported by Occlum.
That was also why we didn't add nginx demo.
Is "fork" not necessary in nginx now? Or you can modify the "fork“ with "vfork" or "posix_spawn" which Occlum supports?

@dzobbe
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dzobbe commented Dec 18, 2023

Yes, in fact I modified the fork with vfork to make it compile
https://github.com/occlum/occlum/pull/1451/files#diff-7141555e4dbf090d6677dbc5a83bf4a54497c169fad03dea9de890a0fae428c7R17

@jessehui
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@dzobbe Thanks for your contribution. It looks like the rt_sigsuspend is not supported and it looks like an important syscall for Nginx.

@dzobbe
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dzobbe commented Dec 19, 2023

Oh, didn't notice that. So it seems there is no way to make it work? :(

@jessehui
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Not really. For rt_sigsuspend, it doesn't seem to be an impossible task. We will have a discussion about that. May we know the scenario of your use case or the reason why you want to support Nginx?

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@dzobbe @qzheng527 @jessehui