Make prometheus reverse proxy upstream variable (#101)

Author: nelsonkopliku

roles/rproxy/defaults/main/main.yml

@@ -15,5 +15,6 @@ rproxy_ssl_cert_as_base64: "{{ nginx_ssl_cert_as_base64 }}"
 rproxy_ssl_key: "{{ nginx_ssl_key }}"
 rproxy_ssl_key_as_base64: "{{ nginx_ssl_key_as_base64 }}"
 rproxy_provision_prometheus: false
+rproxy_prometheus_upstream_name: "prometheus"
 rproxy_prometheus_host: "{{ trento_prometheus_effective_host }}"
 rproxy_prometheus_port: "{{ trento_prometheus_port }}"

roles/rproxy/tasks/main.yml

@@ -54,6 +54,7 @@
     web_upstream: "{{ rproxy_web_upstream_name }}"
     wanda_upstream: "{{ rproxy_wanda_upstream_name }}"
     wanda_location: "{{ rproxy_wanda_location }}"
+    prometheus_upstream: "{{ rproxy_prometheus_upstream_name }}"
   notify:
     - Restart nginx
 

roles/rproxy/templates/trento.conf.j2

@@ -12,7 +12,7 @@ upstream {{ wanda_upstream }} {
 }
 
 {% if rproxy_provision_prometheus -%}
-upstream prometheus {
+upstream {{ prometheus_upstream }} {
   server {{ rproxy_prometheus_host }}:{{ rproxy_prometheus_port }} max_fails=5 fail_timeout=60s;
 }
 {% endif %}
@@ -49,7 +49,7 @@ server {
 
     # Add final slash to replace the prometheus_location value by the value in proxy_pass
     # https://nginx.org/en/docs/http/ngx_http_proxy_module.html#proxy_pass
-    proxy_pass http://prometheus/;
+    proxy_pass http://{{ prometheus_upstream }}/;
   }
 {% endif %}