Cannot build Docker image

[gouthamve]

What did you do?
make docker on master and then tried to run the image.

What did you expect to see?
Prometheus runs!

What did you see instead? Under which circumstances?
standard_init_linux.go:178: exec user process caused "no such file or directory"

Environment

• System information:

Linux 4.9.8-1-ARCH x86_64

• Prometheus version:

prometheus, version 1.5.2 (branch: gouthamve-1637, revision: 7e14533b32afb163209867c295918004e35f8eca)
  build user:       goutham@beast
  build date:       20170301-06:09:00
  go version:       go1.8

I think this is because of dynamic linking, but I would have expected make docker to run out of the box!

[sdurrheimer]

How did you build the prometheus binary ?

[gouthamve]

I did make. I also tried with:
go build -o prometheus github.com/prometheus/prometheus/cmd/prometheus

Both give the same issue :/

[gouthamve]

My hunch was right, when I compile it statically, it works!
I compiled it via

CGO_ENABLED=0 go build -a -o prometheus -installsuffix cgo github.com/prometheus/prometheus/cmd/prometheus

now prometheus starts up in docker!

[brancz]

Yes I've observed this as well, unfortunately the go compiler behaves differently when on OSX or linux. On OSX because there is no glibc to link to it compiles a binary that does not link to it, even when not explicitly disabling cgo. Then when you compile the same thing on linux there is a glibc available and so it links to it, and when you then put that binary in a container it doesn't work anymore.

[gouthamve]

Yes, I think we should be building static binaries only.

But I think this is an issue with promu or the config here. promu is building dynamic ones even after explicitly telling it not to.

[brancz]

Yes I agree, it's quite confusing as the binaries are actually built statically when releasing (using make crossbuild), so the released binaries are statically linked, but not the ones built with make build.

[lock]

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