Split CloudFormation Stacks
This page explains how to convert a master stack system into a split stack system.
Rationale
This section only applies to Datomic 990-9202 and lower. Newer versions of Datomic Cloud do not use the Master stack templates.
A Datomic Cloud system comprises at least 2 CloudFormation stacks per AWS best practice guidelines:
- One storage resource stack
- One or more compute stacks
These stacks are nested under a master stack. The master stack makes various operational tasks more difficult. For production operation, use a split stack system, i.e. separate top-level storage and compute stacks.
There are two ways to run a split stack system:
- Create a split stack system from scratch
- Convert a master stack system into a split stack system, as the instructions below
How to Split Datomic Stacks
The following steps convert a Datomic system from the master stack setup to the split stack setup. There are two steps:
Delete the Master Stack
Deleting the master stack will make your system temporarily unavailable, but does not harm your data:
- Select the root stack for your system in the CloudFormation console. The root stack will have a Stack Name that is the same as your system name.
- Click "Delete" from the menu bar. Confirm this in the Delete Stack popup, then wait for the stack deletion to complete. This can take 10 minutes or more.
Recreating Stacks
The process of recreating the stacks is the same as starting a new split stack system with the following exceptions:
- Storage stack name is the name of the system that you just deleted
- Reuse existing storage must be set to "True"
The split stack instructions are annotated where necessary for recreating your stack.