Why does Consul support tags at all?

[edw...@csdisco.com]

I was immediately taken aback the moment I realized that after defining multiple tags for my nodes, that consul doesn't support filtering based on multiple tags.

I'm completely confounded, why are multiple tags even supported in the first place? How are people getting around this?

My example is I'm registering 'elasticsearch' as a service, and may have multiple clusters, some with master \ data \ client nodes, and some with HTTP access disabled.

If I register them all under 'elasticsearch', I can then just tag them appropriately, and if I was able to filter by multiple tags, always get back exactly which IPs I need.

Without that filtering though, what am I supposed to do? Am I supposed to register a bunch of different service names? because that would be extremely painful.

Thanks

[Chris Miller]

Personally I've created a wrapper API that performs additional filtering on the client side for tags beyond the first one. There's obviously a bit of extra overhead with network traffic but our service queries are infrequent it doesn't matter at all. If/when Consul adds support for filtering on multiple tags, I can just change the wrapper implementation without affecting the rest of the codebase.

[Michael Fischer]

Have you tried the prepared-query functionality?  https://www.consul.io/docs/agent/http/query.html

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[Ethan Edwards]

I'm aware of prepared queries, but I need disposable CRUD automation for them, and neither Terraform or the consul chef cookbook support them.

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Ethan Edwards | Engineer, Development Operations

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