Allow customizing the list of monitored network interfaces (#18)

* Allow customizing the list of monitored network interfaces This is a simple way to customize the selection of network interfaces. If INTERFACE_NAMES_OVERRIDE is set in muninlite.conf, that list is used instead of auto-detection. As muninlite.conf itself is also a script, it is even possible to write a custom command. This feature is helpful in environments with virtual machines or containers, like docker or lxc where there are lots of br-*, veth*, lxcbr* etc interfaces where monitoring doesn't make much sense. I didn't find a way to reliably filter physical interfaces. * Add examples for config with INTERFACE_NAMES_OVERRIDE * Fix "parameter not set" error ./muninlite: 651: INTERFACE_NAMES_OVERRIDE: parameter not set * Make example more portable Co-authored-by: Kenyon Ralph <[email protected]> * Remove example code as requested --------- Co-authored-by: Kenyon Ralph <[email protected]>
munin-monitoring · Jan 13, 2025 · 1b9e7ae · 1b9e7ae
1 parent 0d7e824
commit 1b9e7ae
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diff --git a/muninlite.conf b/muninlite.conf
@@ -1,3 +1,5 @@
 # the following variables are added to the top of the assembled muninlite script
 NTP_PEER="pool.ntp.org"
 DF_IGNORE_FILESYSTEM_REGEX="(none|unknown|rootfs|iso9660|squashfs|udf|romfs|ramfs|debugfs|cgroup_root|devtmpfs)"
+
+#INTERFACE_NAMES_OVERRIDE="eth0"
diff --git a/muninlite.in b/muninlite.in
@@ -78,7 +78,11 @@ RES=""
 for PLUG in $PLUGINS; do
   case "$PLUG" in
     if_|if_err_)
-      interface_names=$(sed 's/^ *//; s/:.*$//; / /d; /^lo$/d' /proc/net/dev)
+      if [ -z "${INTERFACE_NAMES_OVERRIDE:-}" ]; then
+        interface_names=$(sed 's/^ *//; s/:.*$//; / /d; /^lo$/d' /proc/net/dev)
+      else
+        interface_names="$INTERFACE_NAMES_OVERRIDE"
+      fi
       for INTER in $interface_names; do
         INTERRES=$(echo "$INTER" | sed -e 's/\./VLAN/' -e 's/\-/_/g')
         RES="$RES ${PLUG}${INTERRES}"