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Apache Consul Template Example

Apache httpd is a popular web server. You can read more about the Apache httpd configuration file syntax in the Apache httpd documentation.

Reverse Proxy based on Service Tags

Here is an example template for rendering part of an Apache httpd configuration file that is responsible for configuring a reverse proxy with dynamic end points based on service tags with Consul Template:

{{range $tag, $service := service "web" | byTag}}
# "{{$tag}}" api providers.
<Proxy balancer://{{$tag}}>
{{range $service}}  BalancerMember http://{{.Address}}:{{.Port}}
{{end}} ProxySet lbmethod=bybusyness
</Proxy>
Redirect permanent /api/{{$tag}} /api/{{$tag}}/
ProxyPass /api/{{$tag}}/ balancer://{{$tag}}/
ProxyPassReverse /api/{{$tag}}/ balancer://{{$tag}}/
{{end}}

Save this file to disk at a place reachable by the Consul Template process like /tmp/httpd.conf.ctmpl and run Consul Template:

$ consul-template \
  -template="/tmp/httpd.conf.ctmpl:/etc/httpd/sites-available/balancer.conf"

Here is an example of what the file may render:

# "frontend" api providers.
<Proxy balancer://frontend>
  BalancerMember http://104.131.109.106:8080
  BalancerMember http://104.131.109.113:8081
  ProxySet lbmethod=bybusyness
</Proxy>
Redirect permanent /api/frontend /api/frontend/
ProxyPass /api/frontend/ balancer://frontend/
ProxyPassReverse /api/frontend/ balancer://frontend/

# "api" api providers.
<Proxy balancer://api>
  BalancerMember http://104.131.108.11:8500
  ProxySet lbmethod=bybusyness
</Proxy>
Redirect permanent /api/api /api/api/
ProxyPass /api/api/ balancer://api/
ProxyPassReverse /api/api/ balancer://api/