I’ve grown up reading Tom Clancy and probably most of you have at least seen Red October, so this book caught my eye when browsing used books for a recent trip. It’s a fairly human look at what’s involved in sailing on a Trident missile submarine…
I saw recently an email where someone stated that the reason that they manually create deployment scripts is that because of the restirctions put on them by the requirements for auditing and the ability to be able to demonstrate exactly what was deployed at what time.
When automating deployments it really makes sense to use a tool to generate the deployment so you can concentrate on writing productive code instead of deployment scripts. How do you balance the ideal of spending less time writing deployments but also ensure you can audit what happened?
If your deployment process looks something like:
- 1. Compare source and destination + Deploy changes
Then you don’t have much chance, but if you split it into two discrete steps:
- 1. Compare source and destination + Create deploy script
- 2. Run deploy script against target
Then this means that you automatically have an audit trail of what was deployed (the deployment script). You also get the added benefit that the deployment script can be manually reviewed and a friendly dba can run it manually or automatically if they have the capabilities.
If you are writing a deployment pipeline for a database and you miss out the continuous delivery step and go straight for continuous deployment then life is actually a little more complicated, especially from an auditing / non-trust of tools point of view.