Upload:

(FILE=Docker.tmpl.external-elb.json checksum=$(md5 -q ./$FILE) && aws s3 cp ./$FILE s3://cf-cloudformation-templates/$FILE.$checksum)

References

• https://www.terraform.io/docs/providers/aws/r/cloudwatch_log_metric_filter.html

Bastion SSH host

• https://www.digitalocean.com/community/tutorials/how-to-set-up-multi-factor-authentication-for-ssh-on-ubuntu-16-04
• https://www.cyberciti.biz/faq/linux-unix-ssh-proxycommand-passing-through-one-host-gateway-server/
• https://medium.com/@Adim/setting-up-an-infallible-bastion-node-for-private-instances-on-aws-using-cloud-formation-5f383658362
• https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/amazon-linux-ami-basics.html#amazon-linux-cloud-init
• https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/user-data.html#user-data-cloud-init