I regularly start EC2 instances in the AWS and use the spot market whenever I can. Typically this results in reduced costs of at least 25% and frequently much more than that. Lately I’ve been launching an instance to do some OpenShift work (using oc cluster up). Generally I’ve used a c4.2xlarge instance with 100 gb attached. This works very well for my purposes but the spot cost of that instance will range from $0.11 to $0.14 per hour.

While this does not sound like a lot it does add up after a day or two. I decided to check the cpu utilization of it and it runs less than 20%. As a result I am trying out the c4.xlarge at around $0.05 per hour (spot).

This looks like the following


$ 0.14*24
$ 3.36


$ 0.05*24
$ 1.20

This may not look like a lot but when you do it regularly in your personal account your bill begins to be noticeable.

I am going to do my usual work on the c4.xlarge and if it performs well enough I’ll make it a habit.

The key points in this post are to use the spot market if possible and check your instance utilization. If you can get by with smaller/cheaper then do so.

Don’t spend money that you do not have to.

Also, if you want to run OpenShift oc cluster up will do so all in containers. Take a look at https://github.com/openshift/origin/ for details.

To fully provision your instance include the following in the user data at launch.

yum update -y
yum install -y mlocate
yum install -y git
yum install -y docker
service docker start
sleep 5
usermod -a -G docker ec2-user
sed -i 's/^OPTIONS.*/OPTIONS="--insecure-registry\/16 --default-ulimit nofile=1024:4096"/' /etc/sysconfig/docker
service docker restart
sleep 5
cd /tmp/
wget https://github.com/openshift/origin/releases/download/v3.6.0/openshift-origin-client-tools-v3.6.0-c4dd4cf-linux-64bit.tar.gz
gunzip openshift-origin-client-tools-v3.6.0-c4dd4cf-linux-64bit.tar.gz
tar xvf openshift-origin-client-tools-v3.6.0-c4dd4cf-linux-64bit.tar
cp openshift-origin-client-tools-v3.6.0-c4dd4cf-linux-64bit/oc /usr/local/bin/
mount --make-shared /
sed -i.bak -e 's:^\(\ \+\)"$unshare" -m -- nohup:\1"$unshare" -m --propagation shared -- nohup:' /etc/init.d/docker

After launch, do the following to get your cluster up.

/usr/local/bin/oc  cluster up --routing-suffix=`curl`.nip.io --public-hostname=`curl`