Configure munin nodes & master.

Interhost communications are protected by stunnel4.  The graphs are only
visible on the master itself, and content is generated by Fast CGI.

1 files changed, 43 insertions, 0 deletions

diff --git a/roles/common/files/usr/local/share/munin/plugins/dovecot_who b/roles/common/files/usr/local/share/munin/plugins/dovecot_who
new file mode 100755
index 0000000..fe3c743
--- /dev/null
+++ b/roles/common/files/usr/local/share/munin/plugins/dovecot_who
@@ -0,0 +1,43 @@
+#!/bin/sh
+
+# Munin plugin for monitoring Dovecot IMAP connections and unique users.
+# Copyright © 2015 Guilhem Moulin <guilhem@fripost.org>
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+PATH=/usr/bin:/bin:/usr/sbin:/sbin
+set -u
+
+case "${1:-}" in
+    config) cat <<- EOF
+		graph_title Dovecot concurrent IMAP usage
+		graph_args --base 1000 -l 0
+		graph_scale no
+		graph_category dovecot
+		connections.label connections
+		connections.min 0
+		users.label unique users
+		users.min 0
+	EOF
+    exit 0
+    ;;
+esac
+
+tmpfile="$(mktemp --tmpdir)"
+trap 'rm -f "$tmpfile"' EXIT
+
+doveadm -f flow who -1 | sed -nr 's/^username=(\S+)\s+proto=imap\s.*/\1/p' >"$tmpfile"
+
+echo connections.value $(wc -l <"$tmpfile")
+echo users.value       $(sort -u "$tmpfile" | wc -l)