redis: support IPv6 addresses with no port

closes #356

CHANGELOG.md

@@ -19,6 +19,7 @@ changed to just run docker commands in the Makefile. See `make docker-run` and
 ### Bugfixes
 - [#331](https://github.com/influxdb/telegraf/pull/331): Dont overwrite host tag in redis plugin.
 - [#336](https://github.com/influxdb/telegraf/pull/336): Mongodb plugin should take 2 measurements.
+- [#356](https://github.com/influxdb/telegraf/pull/356): Redis plugin IPv6 fix. Thanks @nkatsaros!
 
 ## v0.2.0 [2015-10-27]
 

plugins/redis/redis.go

@@ -114,7 +114,7 @@ const defaultPort = "6379"
 func (r *Redis) gatherServer(addr *url.URL, acc plugins.Accumulator) error {
 	_, _, err := net.SplitHostPort(addr.Host)
 	if err != nil {
-		addr.Host = addr.Host + ":" + defaultPort
+		addr.Host = net.JoinHostPort(addr.Host, defaultPort)
 	}
 
 	c, err := net.Dial("tcp", addr.Host)