Meena automates the morning checklist

#!/bin/bash
# The shebang line - always first. Tells Linux to use bash.

echo "Hello from my first script"
echo "Running as: $(whoami) on $(hostname)"
echo "Time: $(date)"

chmod +x hello.sh    # make it executable
./hello.sh           # run it
bash -x hello.sh     # debug mode - prints every command as it runs

#!/bin/bash
set -euo pipefail    # always add this - exits on any error safely

APP="payment-service"
TODAY=$(date +%Y-%m-%d)
DISK=$(df / | awk 'NR==2{print $5}' | tr -d '%')

if [ "$DISK" -gt 90 ]; then
    echo "CRITICAL: Disk at ${DISK}%"
    exit 1
elif [ "$DISK" -gt 80 ]; then
    echo "WARNING: Disk at ${DISK}%"
else
    echo "OK: Disk at ${DISK}%"
fi

# Check multiple servers:
for SERVER in web-01 web-02 web-03; do
    ping -c 1 $SERVER > /dev/null 2>&1 && echo "$SERVER: UP" || echo "$SERVER: DOWN"
done

# Wait for app after deployment (up to 3 minutes):
for i in {1..18}; do
    HTTP=$(curl -s -o /dev/null -w "%{http_code}" http://localhost:8080/health)
    [ "$HTTP" = "200" ] && echo "App is UP!" && exit 0
    echo "Attempt $i/18 - waiting 10 seconds"
    sleep 10
done
echo "App did not come up in 3 minutes"
exit 1

#!/bin/bash
set -euo pipefail

SERVICES="payment-svc inventory-svc cart-svc"
LOG_DIR="/opt/app/logs"
STATUS="OK"

log() { echo "[$(date '+%H:%M:%S')] $*"; }

check_disk() {
    local USAGE
    USAGE=$(df / | awk 'NR==2{print $5}' | tr -d '%')
    if [ "$USAGE" -gt 85 ]; then
        STATUS="CRITICAL"
        log "CRITICAL: Disk at ${USAGE}%"
    else
        log "OK: Disk at ${USAGE}%"
    fi
}

check_services() {
    for SVC in $SERVICES; do
        if systemctl is-active --quiet "$SVC"; then
            log "OK: $SVC running"
        else
            STATUS="CRITICAL"
            log "DOWN: $SVC is not running!"
        fi
    done
}

log "=== Morning health check ==="
check_disk
check_services
log "Final status: $STATUS"
[ "$STATUS" = "OK" ] && exit 0 || exit 1