From d86142b18c51ed3e2edd82cd44fa9cc871addd23 Mon Sep 17 00:00:00 2001
From: 100daysofdevops <100daysofdevops@gmail.com>
Date: Mon, 13 Mar 2023 16:23:54 -0700
Subject: [PATCH] Script to calculates the memory utilization of a Linux system
 and send alert if threshold exceed

---
 check_system_utilization_metrics/README.md    | 24 +++++++++
 .../check_memory_usage.sh                     | 50 +++++++++++++++++++
 2 files changed, 74 insertions(+)
 create mode 100644 check_system_utilization_metrics/README.md
 create mode 100644 check_system_utilization_metrics/check_memory_usage.sh

diff --git a/check_system_utilization_metrics/README.md b/check_system_utilization_metrics/README.md
new file mode 100644
index 0000000..4597972
--- /dev/null
+++ b/check_system_utilization_metrics/README.md
@@ -0,0 +1,24 @@
+# Foobar
+
+Memory Utilization Check Shell Script
+
+This shell script calculates the memory utilization of a Linux system by subtracting the free, shared, and buffer cache memory from the total memory. If the memory utilization exceeds the threshold (default: 70%), the script will also send an email alert to the specified recipient.
+
+## Requirements
+
+```
+Bash shell
+mail command (for email alerts)
+```
+
+## Usage
+
+```
+bash check_memory_usage.sh
+
+```
+
+## Contributing
+
+Contributions are welcome! If you find any issues or have any suggestions for improvements, please submit an issue or pull request on GitHub.
+
diff --git a/check_system_utilization_metrics/check_memory_usage.sh b/check_system_utilization_metrics/check_memory_usage.sh
new file mode 100644
index 0000000..ec312bd
--- /dev/null
+++ b/check_system_utilization_metrics/check_memory_usage.sh
@@ -0,0 +1,50 @@
+#!/bin/bash
+# Script to Calculate the memory utilization after subtracting the free, shared, and buffer cache memory from the total memory
+
+
+# Set the memory average threshold
+THRESHOLD=70
+
+# Get the total available memory in the system
+total_memory=$(awk '/MemTotal/ {print $2}' /proc/meminfo)
+# Get free memory
+free_memory=$(awk '/MemFree/  {print $2}' /proc/meminfo)
+# Get shared memory
+shared_memory=$(awk '/Shmem/  {print $2}' /proc/meminfo)
+# Get buffer cache memory
+buffer_cache_memory=$(awk '/Buffers/  {print $2}' /proc/meminfo)
+
+# Check if the memory value is numeric
+for val in $total_memory $free_memory $shared_memory $buffer_cache_memory; do
+    if ! [[ $val =~ ^[0-9]+$ ]]; then
+        echo "Error: Invalid memory value"
+        exit 1
+    fi
+done
+
+# Calculate memory utilization
+used_memory=$((total_memory - free_memory - shared_memory - buffer_cache_memory))
+memory_utilization=$((used_memory * 100 / total_memory))
+
+# Check if mail command is installed
+if ! type "mail" > /dev/null
+then
+    echo "mail command is not installed. Installing now..."
+    sudo yum -y install mailx
+else
+    echo "mail command is already installed"
+fi
+
+# Check memory utilization against threshold
+if [ $memory_utilization -gt $THRESHOLD ]
+then
+    echo "Memory utilization is above the threshold of $threshold%"
+    
+    # Send email alert
+    email_subject="Memory utilization is above threshold"
+    email_body="Memory utilization is currently at $memory_utilization%. Please check the server immediately."
+    recipient_email="recipient@example.com"
+    echo "$email_body" | mail -s "$email_subject" "$recipient_email"
+else
+    echo "Memory utilization is below the threshold of $threshold%"
+fi
\ No newline at end of file