Issue building flannel on Ubuntu

[wapptastic]

Installing Flannel on Ubuntu using the following:
Step 1: sudo apt-get install linux-libc-dev golang gcc
Step 2: git clone https://github.com/coreos/flannel.git
Step 3: Run the build script: cd flannel; make

I'm getting the following errors:

vagrant@node03:~/flannel$ make
go build -o dist/flanneld \
	  -ldflags "-X github.com/coreos/flannel/version.Version=v0.6.1-39-gf6d7239"
main.go:37:2: cannot find package "github.com/coreos/flannel/backend/alloc" in any of:
	/usr/lib/go/src/pkg/github.com/coreos/flannel/backend/alloc (from $GOROOT)
	/home/vagrant/go/src/github.com/coreos/flannel/backend/alloc (from $GOPATH)
main.go:38:2: cannot find package "github.com/coreos/flannel/backend/awsvpc" in any of:
	/usr/lib/go/src/pkg/github.com/coreos/flannel/backend/awsvpc (from $GOROOT)
	/home/vagrant/go/src/github.com/coreos/flannel/backend/awsvpc (from $GOPATH)
main.go:39:2: cannot find package "github.com/coreos/flannel/backend/gce" in any of:
	/usr/lib/go/src/pkg/github.com/coreos/flannel/backend/gce (from $GOROOT)
	/home/vagrant/go/src/github.com/coreos/flannel/backend/gce (from $GOPATH)
main.go:40:2: cannot find package "github.com/coreos/flannel/backend/hostgw" in any of:
	/usr/lib/go/src/pkg/github.com/coreos/flannel/backend/hostgw (from $GOROOT)
	/home/vagrant/go/src/github.com/coreos/flannel/backend/hostgw (from $GOPATH)
main.go:41:2: cannot find package "github.com/coreos/flannel/backend/udp" in any of:
	/usr/lib/go/src/pkg/github.com/coreos/flannel/backend/udp (from $GOROOT)
	/home/vagrant/go/src/github.com/coreos/flannel/backend/udp (from $GOPATH)
main.go:42:2: cannot find package "github.com/coreos/flannel/backend/vxlan" in any of:
	/usr/lib/go/src/pkg/github.com/coreos/flannel/backend/vxlan (from $GOROOT)
	/home/vagrant/go/src/github.com/coreos/flannel/backend/vxlan (from $GOPATH)
main.go:30:2: cannot find package "github.com/coreos/flannel/network" in any of:
	/usr/lib/go/src/pkg/github.com/coreos/flannel/network (from $GOROOT)
	/home/vagrant/go/src/github.com/coreos/flannel/network (from $GOPATH)
main.go:31:2: cannot find package "github.com/coreos/flannel/remote" in any of:
	/usr/lib/go/src/pkg/github.com/coreos/flannel/remote (from $GOROOT)
	/home/vagrant/go/src/github.com/coreos/flannel/remote (from $GOPATH)
main.go:32:2: cannot find package "github.com/coreos/flannel/subnet" in any of:
	/usr/lib/go/src/pkg/github.com/coreos/flannel/subnet (from $GOROOT)
	/home/vagrant/go/src/github.com/coreos/flannel/subnet (from $GOPATH)
main.go:33:2: cannot find package "github.com/coreos/flannel/subnet/kube" in any of:
	/usr/lib/go/src/pkg/github.com/coreos/flannel/subnet/kube (from $GOROOT)
	/home/vagrant/go/src/github.com/coreos/flannel/subnet/kube (from $GOPATH)
main.go:34:2: cannot find package "github.com/coreos/flannel/version" in any of:
	/usr/lib/go/src/pkg/github.com/coreos/flannel/version (from $GOROOT)
	/home/vagrant/go/src/github.com/coreos/flannel/version (from $GOPATH)
main.go:26:2: cannot find package "github.com/coreos/pkg/flagutil" in any of:
	/usr/lib/go/src/pkg/github.com/coreos/pkg/flagutil (from $GOROOT)
	/home/vagrant/go/src/github.com/coreos/pkg/flagutil (from $GOPATH)
main.go:27:2: cannot find package "github.com/golang/glog" in any of:
	/usr/lib/go/src/pkg/github.com/golang/glog (from $GOROOT)
	/home/vagrant/go/src/github.com/golang/glog (from $GOPATH)
main.go:28:2: cannot find package "golang.org/x/net/context" in any of:
	/usr/lib/go/src/pkg/golang.org/x/net/context (from $GOROOT)
	/home/vagrant/go/src/golang.org/x/net/context (from $GOPATH)
make: *** [dist/flanneld] Error 1

[HerrmannHinz]

u can go get the missing dependencies one after the other until u have all packages.
just doing this - this is of course just a temporary fix.

[HerrmannHinz]

oh wait but it fails on this one, no step further possible:

root@localhost:/opt/src/flannel# go get k8s.io/kubernetes/pkg/controller/framework package k8s.io/kubernetes/pkg/controller/framework imports k8s.io/kubernetes/pkg/controller/framework imports k8s.io/kubernetes/pkg/controller/framework: cannot find package "k8s.io/kubernetes/pkg/controller/framework" in any of: /usr/lib/go/src/pkg/k8s.io/kubernetes/pkg/controller/framework (from $GOROOT) /root/go/src/k8s.io/kubernetes/pkg/controller/framework (from $GOPATH)

[fabianromerorcc]

Hi HerrmannHinz! Did you figure out how to resolve that package?

I'll appreciate any help

Cheers!

[HerrmannHinz]

@fabianromerorcc no not yet. haven't tried anymore.

[besnik]

Hi all,
following has worked for me (I don't know go so I apologize if there is better solution). You need to specify GOPATH env variable so go can find packages of dependencies that are located in vendor folder. The trick is that you need to clone flannel project into specific path (src/github.com/coreos) and set GOPATH to the directory where src subdirectory is, see below:

Assuming you are in your home directory:

cd ~
export GOPATH=$(pwd)
mkdir -p src/github.com/coreos
cd src/github.com/coreos
git clone https://github.com/coreos/flannel.git
cd flannel
make dist/flanneld

It would be great if go or flannel team could review this as suggest better solution. Ideally vendor folder with dependencies should be located with respect to current directory of calling make (flannel folder). I dont know if this is problem of Go or could be enhanced in Makefile or somewhere.

[tomdee]

Pushed #594 to improve the instructions.

The info from @besnik is exactly right (#552 (comment)) Please add this to the README in a PR if you'd like to see it included.

[tomdee]

@HerrmannHinz if you have your GOPATH set up properly you shouldn't need to go get any packages,