phoenix very simple deploy in digitalOcean

deploy-phoenix.sh

USER="root" # default digitalOcean user
APP_NAME="xxx"
DEPLOY_DIR="/var/www/${APP_NAME}/"
HOST="xxx.xxx.xxx.xxx"

echo -e "1) update project"
CMD="cd ${DEPLOY_DIR} && git pull"
echo $CMD
ssh ${USER}@${HOST} $CMD

echo -e "2) mix deps.get --only prod"
CMD="cd ${DEPLOY_DIR} && mix deps.get --only prod"
echo $CMD
ssh ${USER}@${HOST} $CMD

echo -e "3) MIX_ENV=prod mix compile"
CMD="cd ${DEPLOY_DIR} && MIX_ENV=prod mix compile"
echo $CMD
ssh ${USER}@${HOST} $CMD

echo -e "4) get a pid by server.pid"
CMD="cat ${DEPLOY_DIR}server.pid"
echo $CMD
PID=$(ssh ${USER}@${HOST} $CMD )

echo -e "5) kill by server.pid"
CMD="kill -9 ${PID}"
echo $CMD
ssh ${USER}@${HOST} $CMD

echo -e "6) run server"
CMD="cd ${DEPLOY_DIR} && MIX_ENV=prod PORT=80 elixir \
--detached \
-e \"File.write! 'server.pid', :os.getpid\" \
-pa _build/prod/consolidated -S mix phoenix.server"
echo $CMD
ssh ${USER}@${HOST} $CMD