check_local_webservice.sh: optional number of lines to be printed and some changes on script output.

check_local_webservice.sh

@@ -15,6 +15,11 @@ declare -a alert_email_arr
 # --- Read Configurations from $conf_file
 # -------------
 
+# Some default values
+#
+DEFAULT_NUMBER_LINES=20
+DEFAULT_TIME_OUT=20
+
 if [[ ! -f "$conf_file" ]]; then
    echo ""
    echo -e "   [ Fatal ] Configuration file '$(basename ${conf_file})' not found!"
@@ -33,7 +38,7 @@ done
 [[ -n "$sender_address" ]] || sender_address="check_local_webservice@$(hostname -f)"
 [[ -n "$content_type" ]] || content_type='Content-Type: text/plain;\n charset="utf-8"'
 
-[[ -n "$TIME_OUT" ]] || TIME_OUT=30
+[[ -n "$TIME_OUT" ]] || TIME_OUT=$DEFAULT_TIME_OUT
 TIME_OUT_MAX="$(expr ${TIME_OUT} + 5)"
 
 
@@ -168,6 +173,16 @@ echo_skipped() {
    fi
 }
 
+is_number() {
+
+   return $(test ! -z "${1##*[!0-9]*}" > /dev/null 2>&1);
+
+   # - also possible
+   # -
+   #[[ ! -z "${1##*[!0-9]*}" ]] && return 0 || return 1
+   #return $([[ ! -z "${1##*[!0-9]*}" ]])
+}
+
 reboot_system() {
 
    content_type='Content-Type: text/plain;\n charset="utf-8"'
@@ -286,8 +301,21 @@ msg="${msg_head}\n${msg00}\n${msg01}\n${msg02}\n\n${msg03}\n${msg04}\n${msg05}\n
 
 if [[ ${#LOG_FILES_TO_MONITOR} -gt 0 ]] ; then
    msg_user_defined="\n==========\nUser defined logfiles\n==========\n"
-   for _log_file in $LOG_FILES_TO_MONITOR ; do
-      msg_user_defined="${msg_user_defined}\n---\nLast entries (20 lines) of \"${_log_file}\":\n---\n$(tail -n 20 ${_log_file})\n"
+   for _val in $LOG_FILES_TO_MONITOR ; do
+
+      IFS=':' read -a _val_arr <<< "${_val}"
+      _log_file="${_val_arr[0]}"
+      if [[ -n "${_val_arr[0]}" ]] && is_number "${_val_arr[1]}" ; then
+         _number_lines=${_val_arr[1]}
+      else
+         _number_lines=$DEFAULT_NUMBER_LINES
+      fi
+
+      if [[ -s "${_log_file}" ]] ; then
+         msg_user_defined="${msg_user_defined}\n---\nLast entries (${_number_lines} lines) of \"${_log_file}\":\n---\n$(tail -n ${_number_lines} ${_log_file})\n"
+      else
+         msg_user_defined="${msg_user_defined}\n---\nLast entries (${_number_lines} lines) of \"${_log_file}\":\n---\n-- FILE IS EMPTY --\n"
+      fi
    done
    msg_user_defined="${msg_user_defined}\n\n"
 else
@@ -303,7 +331,7 @@ if [[ ! -f "$RESTART_CHECK_FILE" ]]; then
    err_msg="\n[ Warning ]: The local webservice seems to be down.\n\n             Some Websites do not respond as expected:\n"
 
    for _site in $LOCAL_WEBSITES_TO_CHECK ; do
-      err_msg+="   $_site\n"
+      
       if $LOGGING ; then
          echo -e "\t           \033[1m$_site\033[m"
       else
@@ -317,7 +345,7 @@ if [[ ! -f "$RESTART_CHECK_FILE" ]]; then
    datum="$(date +"%d.%m.%Y %H:%M")"
    for _email in ${alert_email_arr[@]} ; do
 
-      echo -e "To:${_email}\n${content_type}\nSubject:[Warn: Local Webservice NOT rsponding] - Do nothing for now\n$err_msg\n${msg_user_defined}\n${msg}" \
+      echo -e "To:${_email}\n${content_type}\nSubject:[Warn: Local Webservice NOT rsponding] - Do nothing for now\n$err_msg\nFilesystem usage:\n=================\n$(df -h)\n\n${msg_user_defined}\n${msg}" \
          | sendmail -F "Error `hostname -f`" -f $sender_address $_email
   done
 
@@ -328,7 +356,6 @@ else
    err_msg="\n[ Error ]: The local webservice seems to be down.\n\n           Some Websites still not responding:\n"
 
    for _site in $LOCAL_WEBSITES_TO_CHECK ; do
-      err_msg+="   $_site\n"
       if $LOGGING ; then
          echo -e "\t           \033[1m$_site\033[m"
       else
@@ -342,12 +369,12 @@ else
    datum="$(date +"%d.%m.%Y %H:%M")"
    for _email in ${alert_email_arr[@]} ; do
 
-      echo -e "To:${_email}\n${content_type}\nSubject:[Error: Local Webservice IS STILL NOT rsponding] - A system restart is triggered.\n$err_msg\n${msg_user_defined}\n${msg}" \
+      echo -e "To:${_email}\n${content_type}\nSubject:[Error: Local Webservice IS STILL NOT rsponding] - A system restart is triggered.\n$err_msg\nFilesystem usage:\n=================\n$(df -h)\n\n${msg_user_defined}\n${msg}" \
          | sendmail -F "Error `hostname -f`" -f $sender_address $_email
   done
 
    rm -f "$RESTART_CHECK_FILE"
-   reboot_system "The local web service is still down - a system restart is triggered."
+   #reboot_system "The local web service is still down - a system restart is triggered."
 
 fi
 

conf/check_local_webservice.conf.sample

@@ -17,10 +17,21 @@
 # -
 LOCAL_WEBSITES_TO_CHECK=""
 
-# - LOG_FILES_TO_MONITOR
+# - LOG_FILES_TO_MONITOR[:<n>]
 # -
-# - Print out the last 20 lines from theses logfiles
+# - Print out the last lines from theses given logfiles
 # -
+# - its possible to give a number of lines, which should be printed out 
+# - by appending it seperated ba a colon ':'.
+# -
+# - The default number of printed out lines is 20.
+#
+# - Example:
+# -    LOG_FILES_TO_MONITOR="
+# -       /var/log/apache2/ip_requests.log:40
+# -       /var/log/php-7.4-fpm/php_errors.log
+# -      /var/log/mysql/mysql.err:15
+# -    "
 # -
 LOG_FILES_TO_MONITOR=""