From ee5827ccbdfcf28e4e388de562124303d7bf8cd5 Mon Sep 17 00:00:00 2001
From: Tomas Barton <barton.tomas@gmail.com>
Date: Wed, 13 Feb 2019 01:17:09 +0100
Subject: [PATCH] Remove error log when snmp6 directory does not exists with
 nstat input (#5403) (#5413)

---
 plugins/inputs/nstat/README.md |  2 ++
 plugins/inputs/nstat/nstat.go  | 13 +++++++------
 2 files changed, 9 insertions(+), 6 deletions(-)

diff --git a/plugins/inputs/nstat/README.md b/plugins/inputs/nstat/README.md
index c80f893b9..5d2ca6c0a 100644
--- a/plugins/inputs/nstat/README.md
+++ b/plugins/inputs/nstat/README.md
@@ -36,6 +36,8 @@ The sample config file
   # dump_zeros			= 	true
 ```
 
+In case that `proc_net_snmp6` path doesn't exist (e.g. IPv6 is not enabled) no error would be raised.
+
 ### Measurements & Fields
 
 - nstat
diff --git a/plugins/inputs/nstat/nstat.go b/plugins/inputs/nstat/nstat.go
index 5096d7b03..e6dcb420f 100644
--- a/plugins/inputs/nstat/nstat.go
+++ b/plugins/inputs/nstat/nstat.go
@@ -83,13 +83,14 @@ func (ns *Nstat) Gather(acc telegraf.Accumulator) error {
 		return err
 	}
 
-	// collect SNMP6 data
+	// collect SNMP6 data, if SNMP6 directory exists (IPv6 enabled)
 	snmp6, err := ioutil.ReadFile(ns.ProcNetSNMP6)
-	if err != nil {
-		return err
-	}
-	err = ns.gatherSNMP6(snmp6, acc)
-	if err != nil {
+	if err == nil {
+		err = ns.gatherSNMP6(snmp6, acc)
+		if err != nil {
+			return err
+		}
+	} else if !os.IsNotExist(err) {
 		return err
 	}
 	return nil