Nym-node CPU cron service

node_cpu_usage.sh

#!/bin/bash
# -----------------------------------------
# this script is designed to monitor the load on your mixnode or gateway
# whilst there's plenty of ways to do this, this is a simple cron service that polls the nym binary every minute to check CPU 
# you can amend this script on your own accord to do what you need with the results
# in the interim this will write to a simple log file
# -----------------------------------------

# add to your crontab -e 
# chmod +x node_cpu_usage.sh
# */1 * * * * /usr/local/bin/node_cpu_usage.sh nym-mixnode

if [ $# -eq 0 ]; then
    echo "usage: $0 <process_name>"
    exit 1
fi

PROCESS_NAME=$1
LOG_FILE="/var/log/nym_node_cpu_usage.log"

case $PROCESS_NAME in
nym-mixnode | nym-gateway)
    PROCESS_USAGE=$(ps -eo %cpu,comm | grep $PROCESS_NAME | awk '{print $1}')
    ;;
*)
    echo "unsupported process: $PROCESS_NAME"
    exit 2
    ;;
esac

OVERALL_USAGE=$(top -bn1 | grep "Cpu(s)" | sed "s/.*, *\([0-9.]*\)%* id.*/\1/" | awk '{print 100 - $1}')

TIMESTAMP=$(date "+%Y-%m-%d %H:%M:%S")

echo "$TIMESTAMP - $PROCESS_NAME CPU usage: $PROCESS_USAGE%, overall CPU usage: $OVERALL_USAGE%" >>$LOG_FILE