The Deployinator™©

deploy.sh

#!/usr/bin/env bash

set -e

# This script will build a Docker image from the current state of the working tree.
# It will tag it with the short Git sha, and then push it to Quay.io under our company
# account. Afterwards the image can be picked up from other hosts to deploy.

export DEPLOY_HOST=<someapp>.<my-domain>
export REV=`git log -1 --pretty=%h`

echo "Buildind Docker image"
docker build . --build-arg APP_REVISION=$REV --build-arg RACK_ENV=production -t <someapp>:$REV

echo "Copying image to $DEPLOY_HOST"
docker save <someapp>:$REV | ssh -C root@$DEPLOY_HOST docker load

# The _data directory of the docker volume must be set to world-writable so that
# writing to it is possible from within the container. Not the most secure option
# but it does the job. Commented out because it was done from the terminal.
ssh root@$DEPLOY_HOST chmod a+r+w+x /var/lib/docker/volumes/<someapp>-sites/_data
ssh root@$DEPLOY_HOST chmod a+r+w+x /var/lib/docker/volumes/<someapp>-tmp/_data

echo "Running migrations"
docker -H ssh://root@$DEPLOY_HOST run  \
  --rm \
  --network="<someapp>-net" \
  -v <someapp>-sites:/webapp/sites:Z \
  <someapp>:$REV \
  /bin/sh -c 'cd /webapp; bundle exec rake db:migrate'

echo "Stopping the currently running worker container"
docker -H ssh://root@$DEPLOY_HOST stop <someapp>-app || true
docker -H ssh://root@$DEPLOY_HOST rm <someapp>-app || true

# The thing needs to run with --init in case we need to fork subprocesses
echo "Starting the new app container"
docker -H ssh://root@$DEPLOY_HOST run  \
  --name="<someapp>-app" \
  --detach --restart="unless-stopped" \
  --network="<someapp>-net" \
  -v <someapp>-sites:/webapp/sites:Z \
  -v <someapp>-tmp:/webapp/tmp:Z \
  --init \
  -p "9292:9292" \
  -e MALLOC_ARENA_MAX=2 \
  -e APP_REVISION=$REV \
  <someapp>:$REV

echo "Deleting the old <someapp> images"
DELETE_AFTER_AMOUNT=5
IMAGES_TO_DELETE=`docker -H ssh://root@$DEPLOY_HOST images -q <someapp> | awk 'NR>'$DELETE_AFTER_AMOUNT' { print $0 }'`
if [[ $IMAGES_TO_DELETE != "" ]]; then
  echo "Found old docker images, will clean up:"
  echo
  # show full list of images that are more than for ex. 5 (1st line is column name line, therefore 5 + 1) and the column name line itself
  docker -H ssh://root@$DEPLOY_HOST images <someapp> | awk 'NR==1; NR>'$DELETE_AFTER_AMOUNT+1' { print $0 }'
  # force delete the images
  docker -H ssh://root@$DEPLOY_HOST rmi -f $IMAGES_TO_DELETE
fi