Setup Sprite as a Docker builder

install.sh

#! /bin/bash
#
# Installs sshd and dockerd services on a fresh Sprite instance.
#
# curl -fsSL "https://gist.githubusercontent.com/schrockwell/658ee396f6372f54bd9d28276281bd10/raw/install.sh" | bash
#

set -e

sudo apt update && sudo apt upgrade -y
sudo apt install curl openssh-server -y

curl -fsSL https://get.docker.com -o get-docker.sh
sh get-docker.sh

sprite-env services create sshd --cmd /usr/sbin/sshd
sprite-env services create dockerd --cmd sudo --args /usr/bin/dockerd

echo '----------------------------------------------------------'
echo 'Next steps:'
echo
echo '  1. Add your public key to /root/.ssh/authorized_keys'
echo '  2. Locally, `sprite proxy 2223:22`'
echo '  3. Locally, use root@localhost:2223 for Docker builds'
echo '----------------------------------------------------------'

kamal-deploy.yml

builder:
  arch: amd64
  remote: ssh://root@localhost:2223

kamal-post-deploy-hook.sh

#! /bin/bash

if [ -f .kamal/hooks/.pre-build-proxy-pid ]; then
  PROXY_PID=$(cat .kamal/hooks/.pre-build-proxy-pid)
  kill $PROXY_PID
  rm .kamal/hooks/.pre-build-proxy-pid
fi

kamal-pre-build-hook.sh

#! /bin/bash

# kill any existing sprite processes
if [ -f .kamal/hooks/.sprite-pids ]; then
  while read -r pid; do
    if kill -0 "$pid" > /dev/null 2>&1; then
      kill "$pid"
    fi
  done < .kamal/hooks/.sprite-pids
  rm .kamal/hooks/.sprite-pids
fi

# start a console to keep the proxy running
nohup sprite console --sprite docker-build > /dev/null 2>&1 &
disown
echo $! > .kamal/hooks/.sprite-pids

# set up SSH proxy
nohup sprite proxy --sprite docker-build 2223:22 > /dev/null 2>&1 &
disown
echo $! >> .kamal/hooks/.sprite-pids