Only needed to create new machines: (skip this step)

  https://app.packet.net/
  u: bradfitz@golang.org
  p: see link in email (l:password packet)

Machines:

golang-builder-1:

     $ ssh -i ~/keys/id_ed25519_golang1 root@147.75.109.230
     (key: http://go/golang-ssh-key)

Machine details:

  root@golang-builder-1:~# cat /proc/cpuinfo | grep process | wc -l
  96
 
  root@golang-builder-1:~# free
  total        used        free      shared  buff/cache   available
  Mem:      131971924      526620   131055328       12700      389976   130876088
  Swap:       3321056           0     3321056

  root@golang-builder-1:~# lsb_release  -a
  No LSB modules are available.
  Distributor ID:    Ubuntu
  Description:       Ubuntu 16.04.1 LTS
  Release:           16.04
  Codename:          xenial


But each machine is setup like:

   $ apt-get install docker.io
   
   $ build.sh (with Dockerfile in same directory)

   $ echo "<BUILDER KEY>" > /etc/gobuild.key
   
   $ GOARCH=arm64 GOOS=linux go install golang.org/x/build/cmd/rundockerbuildlet && \
     scp -i ~/keys/id_ed25519_golang1 ~/bin/linux_arm64/rundockerbuildlet root@147.75.109.230:/usr/local/bin

   $ scp -i ~/keys/id_ed25519_golang1 rundockerbuildlet.service root@147.75.109.230:/usr/local/bin:/etc/systemd/user/

   $ systemctl enable /etc/systemd/user/rundockerbuildlet.service
   $ systemctl start rundockerbuildlet.service