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aws cloudformation create-change-set \
--stack-name app \
--change-set-name app-$DOCKBIT_DEPLOYMENT_SHA \
--template-body file://./AutoScalingRollingUpdates.json \
--parameters \
ParameterKey=KeyName,UsePreviousValue=true \
ParameterKey=SHAVersion,ParameterValue=$DOCKBIT_DEPLOYMENT_SHA

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for i in $(seq 1 20); do 
  aws cloudformation list-change-sets --stack-name app | grep CREATE_COMPLETE && if [ $? == 0 ]; then break; else continue; fi 
done;
aws cloudformation execute-change-set \
--stack-name app \
--change-set-name app-$DOCKBIT_DEPLOYMENT_SHA

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aws cloudformation wait stack-update-complete --stack-name=app

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FROM busybox
ARG app_version
RUN echo “Building $app_version”

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Sending build context to Docker daemon   1.2 MB
Step 1 : FROM busybox
 ---> 1efc1d465fd6
Step 2 : ARG app_version
 ---> Running in 94d310838e79
 ---> 576425d2c33e
Removing intermediate container 94d310838e79
Step 3 : RUN echo “Building $app_version”
 ---> Running in 7683d34558d1
“Building 1.0”

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FROM busybox
ENV feature_enabled false
CMD sh -c 'if [ "$feature_enabled" = true ]; then echo "Feature activated"; else echo "Feature not activated"; fi'

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$ docker build -t my_app .
$ docker run -e feature_enabled=true my_app
Feature activated

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FROM ruby:%%RUBY_VERSION%%
CMD ruby --version

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#!/bin/bash

render() {
sedStr="
  s!%%RUBY_VERSION%%!$version!g;
"

sed -r "$sedStr" $1
}

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$ ls
2.1			2.3			Dockerfile.template	render.sh
$ cd 2.1 && docker build -t my_app:2.1 .
Sending build context to Docker daemon 2.048 kB
Step 1 : FROM ruby:2.1
 ---> 2903b59d264e
Step 2 : CMD ruby --version
 ---> Running in cea80b05db0f
 ---> 08c4ae2b2188
Removing intermediate container cea80b05db0f