user data for dockerized zcash

zcash-user-data-1.sh

#!/bin/bash

IMG_LABEL=zcash
APP_INIT_URL=https://s3.amazonaws.com/your-bucket-app/myapp-init.tar.gz

function prepare_instance {
  apt-get -y update
  apt-get -y install nginx
  curl -sSL https://get.docker.com/ | sh
  mkdir /opt
  curl -o /opt/deployer.sh http://169.254.169.254/latest/user-data
  chmod 775 /opt/deployer.sh
}

# function download_app {
#   curl -o /tmp/current.tar.gz $1
#   rm -rf /opt/app
#   mkdir -p /opt/app
#   tar zxvf /tmp/current.tar.gz -C /opt/app
#   rm /tmp/current.tar.gz
# }

function dockerfile {
  mkdir -p /opt/app
  cat <<EOT > /opt/app/Dockerfile
FROM ubuntu:xenial
RUN apt-get -y update
RUN apt-get install -y build-essential pkg-config libc6-dev m4 g++-multilib autoconf libtool \
  ncurses-dev unzip git python zlib1g-dev wget bsdmainutils automake
RUN git clone https://github.com/zcash/zcash.git \
  && cd zcash \
  && git checkout v1.0.0-beta2
RUN /zcash/zcutil/fetch-params.sh
RUN /zcash/zcutil/build.sh -j$(nproc)
RUN mkdir ~/.zcash
COPY zcash.conf /root/.zcash/

EXPOSE 22
CMD ["/zcash/src/zcashd"]
EOT
}

function build_image {
  docker tag ${IMG_LABEL}:latest ${IMG_LABEL}:prev || echo "No built app"
  docker build -t ${IMG_LABEL}:latest /opt/app
}

function run_container {
  APP_CID=$(docker run -d ${IMG_LABEL}:latest)
  APP_IP=$(docker inspect --format '{{ .NetworkSettings.IPAddress }}' ${APP_CID})
}

function setup_proxy {
  rm /etc/nginx/sites-enabled/*
  cat <<EOT > /etc/nginx/sites-enabled/app.conf
map \$http_upgrade \$connection_upgrade {
  default upgrade;
  ''      close;
}
upstream app.local {
  server ${APP_IP};
}
server {
  listen 80;
  location / {
    proxy_pass http://app.local;
    include /etc/nginx/proxy_params;
    proxy_http_version 1.1;
    proxy_set_header Upgrade \$http_upgrade;
    proxy_set_header Connection \$connection_upgrade;
  }
}
EOT
  service nginx reload
}

function destroy_previous {
  (docker ps -a --before="${APP_CID}" | awk '{ print $1,$2 }' | grep "${IMG_LABEL}" | awk '{print $1 }' | xargs -I {} docker stop {} | xargs -I {} docker rm {}) || echo "No previous container"
  docker rmi ${IMG_LABEL}:prev || echo "No previous image"
}

if [ ! -f /opt/deployer.sh ];
then
  prepare_instance
  download_app ${APP_INIT_URL}
else
  download_app $1
fi

dockerfile
build_image
run_container
setup_proxy
destroy_previous