add filesystem checks check_fs_errors and check_fs_writable

check_cpu.md

+# IML Checks for Icinga / Nagios
+
+[Home](readme.md)
+
+---
+
+## check CPU
+
+### Introduction
+
+**check_cpu** is a plugin to check cpu usage and cpu io wait.
+It reads cpu data from output of top command and shows
+
+   hwi - Time spent handling hardware interrupt routines. (Whenever a peripheral unit want attention form the CPU, it literally pulls a line, to signal the CPU to service it)
+   swi - Time spent handling software interrupt routines. (a piece of code, calls an interrupt routine...)
+    st - Time spent on involuntary waits by virtual cpu while hypervisor is servicing another processor (stolen from a virtual machine)
+
+  nice - Time spent running niced user processes (User defined priority)
+  wait - Time spent on waiting on IO peripherals (eg. disk)
+
+system - Time spent in kernel space
+  user - Time spent in user space
+  idle - Time spent in idle operations
+
+For all values it sends performance data.
+
+### Syntax
+
+``$ check_NAME [-c CRITICAL] [-w WARING] [-i CRITICAL_IO]``
+
+#### Parameters
+
+```text
+    -w VALUE       cpu usage warning level  (default: 75)
+    -c VALUE       cpu usage critical level (default: 90)
+
+    -i VALUE       io wait critical level   (default: 50)
+
+    -h or --help   show this help.
+
+```
+
+# Examples
+
+``check_cpu -w 60 -c 80 -i 40``
+    check cpu usage.
+    It shows a warning if usage is higer 60%.
+    It shows critical status if usage is higer 80% or io wait is 40%

check_fs_errors

+#!/usr/bin/env bash
+# ======================================================================
+#
+# Check filesystem errors
+#
+#
+# requirements:
+# - sudo permission on /bin/journalctl
+#
+# ----------------------------------------------------------------------
+# 2021-03-23  v0.0  <axel.hahn@iml.unibe.ch>
+# ======================================================================
+
+
+. `dirname $0`/inc_pluginfunctions
+
+
+# ----------------------------------------------------------------------
+# functions
+# ----------------------------------------------------------------------
+
+function showHelp(){
+cat <<EOF
+______________________________________________________________________
+
+CHECK_FS_ERRORS check if kernel logs inconsistency messages
+
+(c) Institute for Medical Education - Univerity of Bern
+Licence: GNU GPL 3
+______________________________________________________________________
+
+
+SYNTAX:
+`basename $0` [-h]
+
+OPTIONS:
+
+    -h or --help   show this help.
+
+PARAMETERS:
+
+    none
+
+EXAMPLE:
+`basename $0`
+
+EOF
+}
+# ----------------------------------------------------------------------
+# MAIN
+# ----------------------------------------------------------------------
+
+# --- check required tools
+# ph.require bc top
+
+
+# --- check param -h
+case "$1" in
+    "--help"|"-h")
+        showHelp
+        exit 0
+        ;;
+    *)
+esac
+
+
+# ----- MAKE CHECK
+
+out=$( sudo /bin/journalctl | grep 'kernel: ' | grep -v 'check_fs_errors' | grep -E '(error|fail)' | grep 'inconsistent' )
+test ! -z "$out" && ph.setStatus "critical"
+
+
+# ----- OUTPUT
+
+ph.status "check if kernel logs inconsistency messages"
+echo $out
+
+
+# ----- CLEANUP AND BYE!
+
+ph.exit
+
+# ----------------------------------------------------------------------

check_fs_writable

+#!/usr/bin/env bash
+# ======================================================================
+#
+# Check filesystem ... is it readonly?
+#
+# requirements:
+# - none
+#
+# ----------------------------------------------------------------------
+# 2021-03-23  v0.0  <axel.hahn@iml.unibe.ch>
+# ======================================================================
+
+
+. `dirname $0`/inc_pluginfunctions
+
+dirs2test="/tmp /var/tmp"
+out=""
+
+# ----------------------------------------------------------------------
+# functions
+# ----------------------------------------------------------------------
+
+function showHelp(){
+cat <<EOF
+______________________________________________________________________
+
+CHECK_FS_READONLY check if filesystem is readonly - v0.0
+
+(c) Institute for Medical Education - Univerity of Bern
+Licence: GNU GPL 3
+______________________________________________________________________
+
+
+SYNTAX:
+`basename $0` [directory [more directories]]
+
+OPTIONS:
+
+    -h or --help   show this help.
+
+PARAMETERS:
+
+    DIRECTORY where to touch a temporary file
+
+EXAMPLE:
+`basename $0` /tmp /root /var/www
+
+EOF
+}
+# ----------------------------------------------------------------------
+# MAIN
+# ----------------------------------------------------------------------
+
+# --- check required tools
+# ph.require bc top
+
+
+# --- check param -h
+case "$1" in
+    "--help"|"-h")
+        showHelp
+        exit 0
+        ;;
+    *)
+esac
+
+# params are directory names ... if a param was given it overrides the internal default
+test $# -gt 0 && dirs2test="$*"
+
+
+# ----- MAKE CHECK
+
+for mydir in $dirs2test
+do
+  touchfile=$mydir/icinga_touch_testfile__${RANDOM}_${RANDOM}
+  out="$out
+
+--- touching something into $mydir
+  $( touch $touchfile && ls -l $touchfile && rm -f $touchfile 2>&1 )"
+  if [ $? -ne 0 ]; then
+    ph.setStatus "critical"
+  fi
+done
+
+
+# ----- OUTPUT
+
+ph.status "check if filesystem is writable in $dirs2test $out"
+#echo "$out"
+
+
+# ----- CLEANUP AND BYE!
+
+ph.exit
+
+# ----------------------------------------------------------------------