Merge pull request #761 from benyanke/patch-1

Allowing TTL to be specified by Env var

infra-templates/digitalocean-dns/3/README.md

@@ -11,7 +11,7 @@ Rancher External DNS service powered by DigitalOcean
 #### Usage
 
 ##### DigitalOcean DNS record TTL
-The DigitalOcean API currently does not support per-record TTL setting. You should configure the global TTL setting for the domain manually and set it to a low value (e.g. 60).
+The DigitalOcean API currently supports per-record TTL setting (https://developers.digitalocean.com/documentation/v2/#create-a-new-domain-record), but it is not yet implemented in this tool. You should configure the global TTL setting for the domain manually and set it to a low value (e.g. 60).
 
 ##### Limitation when running the service on multiple Rancher servers
 

infra-templates/digitalocean-dns/3/docker-compose.yml

@@ -7,7 +7,7 @@ digitalocean:
     DO_PAT: ${DO_PAT}
     ROOT_DOMAIN: ${ROOT_DOMAIN}
     NAME_TEMPLATE: ${NAME_TEMPLATE}
-    TTL: 300
+    TTL: ${DNS_TTL}
   labels:
     io.rancher.container.create_agent: "true"
     io.rancher.container.agent.role: "external-dns"

infra-templates/digitalocean-dns/3/rancher-compose.yml

@@ -15,6 +15,13 @@
       description: "The domain name managed by DigitalOcean."
       type: "string"
       required: true
+    - variable: "DNS_TTL"
+      label: "TTL"
+      description: |
+        TTL used for new DNS records.
+      type: "string"
+      default: "300"
+      required: true      
     - variable: "NAME_TEMPLATE"
       label: "DNS Name Template"
       description: |