From c48cc985b242ad43ea560abbb1b8c6e06534ae49 Mon Sep 17 00:00:00 2001
From: "Dustin C. Hatch" <dustin@hatch.name>
Date: Wed, 3 Aug 2022 21:21:36 -0500
Subject: [PATCH] r/collectd: Ignore filesystems by path

In addition to ignoring particular types of filesystems, e.g. OverlayFS,
we can also ignore filesystems by their mount point.  This could be
useful, for example, for bind-mounted directories, such as those used on
Kubernetes nodes.
---
 group_vars/kubelet.yml                       | 4 ++++
 roles/collectd/defaults/main.yml             | 1 +
 roles/collectd/templates/collectd-df.conf.j2 | 9 +++++++++
 3 files changed, 14 insertions(+)

diff --git a/group_vars/kubelet.yml b/group_vars/kubelet.yml
index cfd491c..4773cea 100644
--- a/group_vars/kubelet.yml
+++ b/group_vars/kubelet.yml
@@ -8,3 +8,7 @@ collectd_processes_controller:
 - name: etcd
 - name: kube-apiserver
 - name: kube-controller
+collectd_df_ignore_mountpoint:
+- /etc/cni/net.d
+- /opt/cni
+- /usr/libexec/kubernetes/kubelet-plugins
diff --git a/roles/collectd/defaults/main.yml b/roles/collectd/defaults/main.yml
index ea06caa..c5b0842 100644
--- a/roles/collectd/defaults/main.yml
+++ b/roles/collectd/defaults/main.yml
@@ -2,6 +2,7 @@ collectd_default_config: true
 collectd_load_network_plugin: false
 collectd_network_servers: []
 collectd_network_listen: []
+collectd_df_ignore_mountpoint: []
 collectd_df_ignore_fstype:
 - overlay
 
diff --git a/roles/collectd/templates/collectd-df.conf.j2 b/roles/collectd/templates/collectd-df.conf.j2
index 53d8925..3ed4121 100644
--- a/roles/collectd/templates/collectd-df.conf.j2
+++ b/roles/collectd/templates/collectd-df.conf.j2
@@ -6,3 +6,12 @@
     IgnoreSelected true
 </Plugin>
 {% endif %}
+{% if collectd_df_ignore_mountpoint %}
+
+<Plugin df>
+{% for path in collectd_df_ignore_mountpoint %}
+    MountPoint "{{ path }}"
+{% endfor %}
+    IgnoreSelected true
+</Plugin>
+{% endif %}