From 0ce33ddf7e4e4029f37d031799240c8287b2dc7b Mon Sep 17 00:00:00 2001
From: "Hahn Axel (hahn)" <axel.hahn@unibe.ch>
Date: Thu, 12 Oct 2023 14:49:12 +0200
Subject: [PATCH] add check_journallog
---
check_journallog | 130 +++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 130 insertions(+)
create mode 100755 check_journallog
diff --git a/check_journallog b/check_journallog
new file mode 100755
index 0000000..5f85292
--- /dev/null
+++ b/check_journallog
@@ -0,0 +1,130 @@
+#!/bin/bash
+# ======================================================================
+#
+# Check count of written entries in journallog
+#
+# requirements:
+# - journalctl
+#
+# ----------------------------------------------------------------------
+# 2023-10-12 v0.1 <axel.hahn@unibe.ch> initial version
+# ======================================================================
+
+
+. $( dirname $0 )/inc_pluginfunctions
+
+export self_APPVERSION=0.1
+
+tmpfile=/tmp/last_journallog_line_${USER}.txt
+
+# ----------------------------------------------------------------------
+# FUNCTIONS
+# ----------------------------------------------------------------------
+
+# show help text
+function showHelp(){
+ local _self; _self=$(basename $0)
+cat <<EOF
+$( ph.showImlHelpHeader )
+
+Show number of lines in journallog per min.
+A strong change of the written lines per min COULD indicate a problem.
+
+The status is ...
+- unknown - if journalctl is not available
+ - if the script is started the 1st time and stores the last
+ line of the journallog
+- ok - when showing written tnries per min
+- warning/ critical - when giving -c and -w parameter values
+
+This plugin sends performancedata.
+
+SYNTAX:
+ $_self [-h] [-w WARN_LIMIT] [-c CRITICAL_LIMIT]
+
+OPTIONS:
+ -h this help
+ -w VALUE warning level (default: 0)
+ -c VALUE critical level (default: 0)
+
+PARAMETERS:
+ None.
+
+EXAMPLES:
+
+ $_self show count of newly written log entries
+ $_self -w 100 -c 200
+ Set warning level to 100 written lines per min and
+ critical to 200.
+ $_self -w 100
+ Set warning level to 100 written lines per min but
+ no critical limit. This check then never will send a
+ critical status.
+EOF
+}
+
+# ----------------------------------------------------------------------
+# MAIN
+# ----------------------------------------------------------------------
+
+# handle params
+ph.hasParamoption "h" "$@"; bOptHelp=$?
+
+if [ $bOptHelp -eq 0 ]; then
+ showHelp
+ exit 0
+fi
+
+ph.require journalctl
+
+typeset -i iWarnLimit=$( ph.getValueWithParam 0 w "$@")
+typeset -i iCriticalLimit=$( ph.getValueWithParam 0 c "$@")
+
+
+lastLine=$( cat "$tmpfile" 2>/dev/null )
+if [ -z "$lastLine" ]; then
+ ph.setStatus unknown
+ ph.status "Initializing ... storing last line of jorunallog ..."
+ journalctl -n 1 > "$tmpfile"
+else
+ ts=$( cut -f 1-3 -d " " <<< "$lastLine" )
+ typeset -i iAge; iAge=$( ph.getFileAge "$tmpfile" )
+ data=$( journalctl --since "$ts" )
+
+ # for next run: insert last handled line
+ tail -1 <<< "$data" > "$tmpfile"
+
+ # detect last seen position and count lines from there
+ typeset -i iTotal; iTotal=$( wc -l <<< "$data" )
+ typeset -i iFrom; iFrom=$( grep -Fn "$lastLine" <<< "$data" | head -1 | cut -f 1 -d ':' )
+ typeset -i iLines; iLines=$iTotal-$iFrom
+ typeset -i iLinespermin; iLinespermin=$iLines*60/$iAge
+
+ if [ $iWarnLimit -gt 0 -a $iWarnLimit -le $iLinespermin ]; then
+ ph.setStatus "warning"
+ fi
+ if [ $iCriticalLimit -gt 0 -a $iCriticalLimit -le $iLinespermin ]; then
+ ph.setStatus "critical"
+ fi
+
+ ph.perfadd "lines-per-min" "${iLinespermin}"
+
+ # output
+ ph.status "Journallog stored $iLinespermin lines per min"
+ sLimits=""
+ test $iWarnLimit -gt 0 && sLimits+="WARNING at $iWarnLimit"
+ test $iWarnLimit -gt 0 || sLimits+="No warning level"
+ sLimits+="; "
+ test $iCriticalLimit -gt 0 && sLimits+="CRITICAL at $iCriticalLimit"
+ test $iCriticalLimit -gt 0 || sLimits+="No critical level "
+
+ echo "Limits: $sLimits"
+ # echo "Found $iLines new line(s) in the last $iAge sec"
+
+fi
+
+# cat "$tmpfile"
+
+ph.exit
+
+# ----------------------------------------------------------------------
--
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