Closed fmalk closed 1 year ago
If this is indeed a limitation with GrouphViz (as it seems to be), this is the best explanation I've found on it:
https://marc.info/?l=graphviz-interest&m=114421940507106
Sorry, no. General subgraphs can share nodes without implying subset containment but \ not clusters. The problem is in the drawing. If clusters can overlap arbitrarily, \ drawing them becomes the problem of drawing Venn diagrams, for which there are no \ good algorithms.
Which is a fair point. I've noticed PlantUML & C4 also don't encourage the use of "border icons", like the IGW at the top right of the first example on my previous post.
I also believe this is a limitation of GraphViz. It might be worth creating an issue under https://github.com/plantuml/plantuml/issues and see if other PlantUML users have ideas.
One thing with usual AWS diagrams is that some groups have overlaps, like ASG, ECS, etc:
Example: https://d2908q01vomqb2.cloudfront.net/fc074d501302eb2b93e2554793fcaf50b3bf7291/2022/09/29/Figure-1.-Launchmetrics-backend-architecture.png Another example: https://d2908q01vomqb2.cloudfront.net/fc074d501302eb2b93e2554793fcaf50b3bf7291/2022/01/12/Fig1-dataPlane.png
I've researched and it seems to me that PlantUML doesn't encourage that kind of overlap, I couldn't find any example of PlantUML or C4 diagram using that kind of overlap. If this is something that can be done by some sort of
retangle
orGrouping
, I'll be happy to try and submit an improvement if anyone can point me at a direction on how to achieve such a thing. By taking a look at the code source I came up empty on ideas.As it is, the only sane solution to describe how a number of resources can span multiple subnets in the same VPC is to describe the group/cluster as a group, and repeat the same subnets/AZ on each one.