Cross-compile Elastic Filebeat for ARM with docker. Works Raspberry Pi 2

cross-compile_filebeat_arm.sh

#----- Create a Docker for cross-compilation -----#
mkdir build && cd $_
docker run -it --rm -v `pwd`:/build golang:1.8.3 /bin/bash
#----- Inside docker -----#
go get github.com/elastic/beats       
cd /go/src/github.com/elastic/beats/filebeat/
git checkout v5.6.3
GOARCH=arm go build
cp filebeat /build
exit
#----- Verify the outputfile -----#
file filebeat 
#filebeat: ELF 32-bit LSB executable, ARM, EABI5 version 1 (SYSV), statically linked, not stripped