From f8cc9719a237ab221594a7ac2c42c4cc18d1859a Mon Sep 17 00:00:00 2001
From: Daniel Nelson <daniel.nelson@influxdb.com>
Date: Wed, 20 Feb 2019 17:57:08 -0800
Subject: [PATCH] Document how to increase the file limit in the ping input

---
 plugins/inputs/ping/README.md | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/plugins/inputs/ping/README.md b/plugins/inputs/ping/README.md
index 4f953c8e1..1083c0074 100644
--- a/plugins/inputs/ping/README.md
+++ b/plugins/inputs/ping/README.md
@@ -40,6 +40,27 @@ apt-get install iputils-ping
   # arguments = ["-c", "3"]
 ```
 
+#### File Limit
+
+Since this plugin runs the ping command, it may need to open several files per
+host.  With a large host list you may receive a `too many open files` error.
+
+To increase this limit on platforms using systemd it must be done in the
+service file.
+
+
+Find the service unit file:
+```
+$ systemctl show telegraf.service -p FragmentPath
+FragmentPath=/lib/systemd/system/telegraf.service
+```
+
+Set the file number limit:
+```
+[Service]
+LimitNOFILE=4096
+```
+
 ### Metrics:
 
 - ping