Installing one of the linaro machines,

Currently:

Host arm64-go-1
    User brad.fitzpatrick
    StrictHostKeyChecking no
    UserKnownHostsFile /dev/null
    ProxyCommand ssh -A brad.fitzpatrick@aus-colo.linaro.org nc -q0 r2-a25-go1 %p
Host arm64-go-2
    User brad.fitzpatrick
    StrictHostKeyChecking no
    UserKnownHostsFile /dev/null
    ProxyCommand ssh -A brad.fitzpatrick@aus-colo.linaro.org nc -q0 r2-a25-go2 %p
Host arm64-go-3
    User brad.fitzpatrick
    StrictHostKeyChecking no
    UserKnownHostsFile /dev/null
    ProxyCommand ssh -A brad.fitzpatrick@aus-colo.linaro.org nc -q0 r2-a25-go3 %p
Host arm64-go-4
    User brad.fitzpatrick
    StrictHostKeyChecking no
    UserKnownHostsFile /dev/null
    ProxyCommand ssh -A brad.fitzpatrick@aus-colo.linaro.org nc -q0 r2-a25-go4 %p
Host arm64-go-5
    User brad.fitzpatrick
    StrictHostKeyChecking no
    UserKnownHostsFile /dev/null
    ProxyCommand ssh -A brad.fitzpatrick@aus-colo.linaro.org nc -q0 r1-a4-go5 %p

... which permit ssh public key:

ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQDnW173QBalrgEiAf6NTEkB+Mi/jO1g+y6p0irn1KJ81gNaMAgbRIbNSARBGDLm0TcNCGRwmKCIQZLSPgXdIRf7wHr9vZWLUvSYTExTU839XxlazhV8LW4jj8qLd78JA4oEnsTVFgMnSbQ1wqk4CMU8/PGK+wEJr9aZ3LUoATCfgJJfqOMq51zzcvLWN9H3QDwVwL9kECgqFnfetwZ+Ie0dLo8oUsLUei0+ajWPwjMFBm8jcuEd3X+CCKkTWe9z7UaKqQWtYkaNFjUs5cQG8ycLcYrgdSAUEiw8PKvf8CDOpSmONOAr/boY8V2V9iCBZiHVKl05bdkl+KRB9B85fVA7 bradfitz@laptop

For each node above: (sadly, not automated)

- cp sources.list to /etc/apt/sources.list
# apt-get update

- Put builder key for "linux-arm64-buildlet" at /root/.gobuildkey
- Put buildlet.service at /etc/systemd/system/
# systemctl enable buildlet.service
# systemctl start buildlet.service