Load test Monitor script

 #!/bin/bash

# Define logfile and other variables

LOGFILE="/path/to/mongod.log"    # Path to MongoDB log file

OUTPUT_FILE="/path/to/output.log" # Path where the output will be saved

# Record the date

echo "===== Date: $(date) =====" >> $OUTPUT_FILE

# Record just the first line of w output (system uptime, users, and load average)

echo "===== System Uptime, Users, and Load Average (w command) =====" >> $OUTPUT_FILE

w | head -n 1 >> $OUTPUT_FILE

# Record only the %user value from iostat

echo "===== I/O Statistics (%user from iostat command) =====" >> $OUTPUT_FILE

iostat | awk '/^ / {getline; print "User CPU: " $1 "%"}' >> $OUTPUT_FILE

# Capture top processes, filtering for MongoDB (mongod)

echo "===== Top Processes (top command) - Filter for mongod =====" >> $OUTPUT_FILE

top -b -n 1 | grep mongod >> $OUTPUT_FILE

# Filter MongoDB log for specific information (e.g., errors, warnings)

echo "===== MongoDB Logfile Filter =====" >> $OUTPUT_FILE

grep -E "ERROR|WARN" $LOGFILE >> $OUTPUT_FILE

# Optionally add a separator for clarity in the output

echo "===================================================" >> $OUTPUT_FILE