Linux Monitor - Device Standards Script

#!/bin/bash

# This resource is provided as a convenience for Level users. We cannot 
# guarantee it will work in all environments. Please test before deploying 
# to your production environment. We welcome contributions to our community 
# library

# Level Library
# https://level.io/library/script-linux-monitor-device-standards

# Define minimum standards
MIN_CORES={{cf_minimum_cpu}}
MIN_RAM={{cf_minimum_ram}}  # in GB
MIN_DISK={{cf_minimum_storage}}  # in GB
STANDARDS_BYPASS={{cf_standards_bypass}}
echo "Current STANDARDS_BYPASS value: $STANDARDS_BYPASS"

# Check for standards bypass
if [ "${STANDARDS_BYPASS}" = "true" ] || [ "${STANDARDS_BYPASS}" = "1" ]; then
   echo "Standards check bypassed by configuration"
   exit 0
fi

# Initialize issues array
declare -a issues

# Check CPU Cores
CPU_CORES=$(nproc)
if [ "$CPU_CORES" -lt "$MIN_CORES" ]; then
   issues+=("ALERT: CPU has $CPU_CORES cores, below the minimum requirement of $MIN_CORES cores.")
fi

# Check RAM
TOTAL_RAM_KB=$(grep MemTotal /proc/meminfo | awk '{print $2}')
TOTAL_RAM_GB=$((TOTAL_RAM_KB / 1024 / 1024))
if [ "$TOTAL_RAM_GB" -lt "$MIN_RAM" ]; then
   issues+=("ALERT: System has $TOTAL_RAM_GB GB of RAM, below the minimum requirement of $MIN_RAM GB.")
fi

# Check Disk Space
TOTAL_DISK_KB=$(df / | awk 'NR==2 {print $2}')
TOTAL_DISK_GB=$((TOTAL_DISK_KB / 1024 / 1024))
if [ "$TOTAL_DISK_GB" -lt "$MIN_DISK" ]; then
   issues+=("ALERT: Total disk space is $TOTAL_DISK_GB GB, below the minimum requirement of $MIN_DISK GB.")
fi

# Check if disk is SSD (handles both standard and LVM setups)
ROOT_DEVICE=$(lsblk -no pkname,type $(df -P / | awk 'NR==2 {print $1}') 2>/dev/null | grep "disk" | awk '{print $1}')
if [ -n "$ROOT_DEVICE" ] && [ -f "/sys/block/$ROOT_DEVICE/queue/rotational" ]; then
   ROTATIONAL=$(cat "/sys/block/$ROOT_DEVICE/queue/rotational")
   if [ "$ROTATIONAL" = "1" ]; then
       issues+=("ALERT: The primary disk is not an SSD.")
   fi
fi

# Output results
if [ ${#issues[@]} -gt 0 ]; then
   printf '%s\n' "${issues[@]}"
   exit 1
else
   echo "System check passed:
- CPU cores: $CPU_CORES (min: $MIN_CORES)
- RAM: $TOTAL_RAM_GB GB (min: $MIN_RAM GB)
- Disk space: $TOTAL_DISK_GB GB (min: $MIN_DISK GB)"
   exit 0
fi