is cross-stack subresource ownership possible? ex....
# getting-startedm
magnificent-soccer-44287
10/15/2023, 9:05 PMis cross-stack subresource ownership possible? ex.:
• I have an ApplicationLoadBalancer defined in "core-infrastructure" github repo / pulumi project
• I'd like to load it in a different repo and add a target group to it which that repo / stack owns.
or do all target groups need to be created in "core-infrastructure" and then their ARNs exported + StackRef'd
l
little-cartoon-10569
10/15/2023, 10:57 PMNo, there is no concept of sub-resources. You can create a TG in any project and its LoadBalancerID can be from any other project.
little-cartoon-10569
10/15/2023, 10:57 PMYou need to be aware of these dependencies, because they make actions like replacements harder to track. But that's all.
m
magnificent-soccer-44287
10/15/2023, 10:58 PMgotcha. would it be a possible circular though? let's say i got:
• project A with ALB
• project B with targetGroup
B imports ARN from A
does A need any awareness of B?
l
little-cartoon-10569
10/15/2023, 10:58 PMYou should absolutely avoid that sort of thing. It is possible through a sequence of deployments, but you shouldn't do it.
m
magnificent-soccer-44287
10/15/2023, 10:59 PMi figured as much - how do I work around that?
l
little-cartoon-10569
10/15/2023, 10:59 PMIt means you can't destroy either project's stacks without code changes and redeployments
m
magnificent-soccer-44287
10/15/2023, 10:59 PMyeah
l
little-cartoon-10569
10/15/2023, 10:59 PMWhat's the problem that requires a workaround?
m
magnificent-soccer-44287
10/15/2023, 10:59 PMI'm working on a microstack pattern outlined here -> https://blog.bitsrc.io/managing-micro-stacks-using-pulumi-87053eeb8678
is this a fair resource? I havent found many [n] microstack examples in the pulumi example github
magnificent-soccer-44287
10/15/2023, 11:00 PMright now the problem is mostly my lack of comprehension 😅
l
little-cartoon-10569
10/15/2023, 11:01 PMPulumi introduced Micro-StacksI wonder where he got that from. There's nothing called "micro-stacks" in the Pulumi docs, afaik. It's just a project architecture.
m
magnificent-soccer-44287
10/15/2023, 11:01 PMgood to know for starters!
l
little-cartoon-10569
10/15/2023, 11:02 PMSpend a little time designing your solution. Ensure all your dependencies follow a single direction, and nothing is circular. If you can do that, then you should have fewer problems.
m
magnificent-soccer-44287
10/15/2023, 11:03 PMi mean yeah the fundamental patterns of sane infra don't change regardless of the tool haha;
magnificent-soccer-44287
10/15/2023, 11:03 PMjust curious about the implementation pattern more than anything
l
little-cartoon-10569
10/15/2023, 11:03 PMAlso, it's not a biggy, but I recommend against using CallbackFunction. In my experience, mushing the app code into the infra codebase isn't terribly helpful and can lead to maintenance problems.
m
magnificent-soccer-44287
10/15/2023, 11:04 PMum... yeah. just looked it up, that's an antipattern to say the least
magnificent-soccer-44287
10/15/2023, 11:04 PMi guess its okay to have as an absolute oh 💩 button
l
little-cartoon-10569
10/15/2023, 11:05 PMIt's great for rapid prototyping, it can be ok for infra-specific code.. but for app code, since you often have different devs, different deploy cycles, and different test regimes and requirements, it's just too hard to keep them in one codebase.
little-cartoon-10569
10/15/2023, 11:06 PMIf nothing else, the testability goes way down.
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