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simple (?) consul-template for HAProxy to allow it to work nicely with consul

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haproxy-consultemplate

simple (?) consul-template for HAProxy to allow it to work nicely with consul.

This scans for all services with the tag "proxy" then adds a LB rule for them. Following additional behaviors worth noting:

  • RUBY VARIABLES <%= @target_domain %> AND <%= @ipaddress %> must equal the served domain suffix and IP address of haproxy.
  • <%= @wildcardcertpath %> should probably be replaced with your own wildcard certificate
  • consul kv store is searched for "service/< servicename >" for overriding values incase defaults arn't correct.
    • "balance_addport" is an addiional port number to LB (not on 443, but as passthrough)
    • "balance_type" overrides the default roundrobin mode (usually to "source")
    • "balance_addserveroptions" inserts said string directly into the backend server options. Catch-all for things like timeout
  • "service/manual-haproxy" allows for a K/V list of maunally input HAPproxy endpoints, incase you wish to use a service not defined in consul. The tempalte will set the KEY as the URL to redirect, and the VALUE as the target URL.

Note as this is using consul, there are no checks generated, as it's assumed your checks are defined and monitored in consul itself.

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