Consul-Template - Is there any way to query the current DC

[m...@pagerduty.com]

Hi Folks,

Is there any way in consul-template to identify the datacenter that the template is being rendered in?

Basically, I want to render an HAProxy config file, and I want servers in the local datacenter to be rendered one way, and servers not in the local datacenter to be rendered another way (as backups). I'm good with using {{datacenters}} and looping over the service in each datacenter, but how will I know when I'm in the local datacenter?

Thanks!

mia

[Webert de Souza Lima]

You can use Consul Key-Value Store to store the datacenter information and fetch it like you'd fetch it using the template.

[Michael Fischer]

Alternatively, query Consul before you launch consul-template to fetch the current DC name and store it in an environment variable (e.g. $CONSUL_DC), then then reference it using {{env "CONSUL_DC"}}.

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