Adding a retry to the initial telegraf database connection

Fixes #187

CHANGELOG.md

@@ -12,6 +12,7 @@ a naming consistency issue, so cpu_percentageIdle will become cpu_usage_idle
 - [#181](https://github.com/influxdb/telegraf/issues/181): Makefile GOBIN support. Thanks @Vye!
 - [#203](https://github.com/influxdb/telegraf/pull/200): AMQP output. Thanks @ekini!
 - [#182](https://github.com/influxdb/telegraf/pull/182): OpenTSDB output. Thanks @rplessl!
+- [#187](https://github.com/influxdb/telegraf/pull/187): Retry output sink connections on startup.
 
 ### Bugfixes
 - [#170](https://github.com/influxdb/telegraf/issues/170): Systemd support

agent.go

@@ -88,9 +88,14 @@ func (a *Agent) Connect() error {
 			log.Printf("Attempting connection to output: %s\n", o.name)
 		}
 		err := o.output.Connect()
+		if err != nil {
+			log.Printf("Failed to connect to output %s, retrying in 15s\n", o.name)
+			time.Sleep(15 * time.Second)
+			err = o.output.Connect()
 			if err != nil {
 				return err
 			}
+		}
 		if a.Debug {
 			log.Printf("Successfully connected to output: %s\n", o.name)
 		}