Practical DevOps Scripts

import psutil
 
def check_system_health(cpu_threshold=80, mem_threshold=80):
    cpu_usage = psutil.cpu_percent(interval=1)
    mem_usage = psutil.virtual_memory().percent
    disk_usage = psutil.disk_usage('/').percent
 
    print(f"--- System Status ---")
    print(f"CPU:    {cpu_usage}%")
    print(f"Memory: {mem_usage}%")
    print(f"Disk:   {disk_usage}%")
 
    if cpu_usage > cpu_threshold:
        print("ALERT: High CPU Usage!")
    if mem_usage > mem_threshold:
        print("ALERT: High Memory Usage!")
 
if __name__ == "__main__":
    check_system_health()

--- System Status ---
CPU:    15.4%
Memory: 62.1%
Disk:   44.8%

import boto3
import tarfile
import os
from datetime import datetime
 
def backup_to_s3(source_dir, bucket_name):
    s3 = boto3.client('s3')
    date = datetime.now().strftime('%Y-%m-%d')
    archive_name = f"backup-{date}.tar.gz"
 
    # Create compressed archive
    with tarfile.open(archive_name, "w:gz") as tar:
        tar.add(source_dir, arcname=os.path.basename(source_dir))
    
    # Upload to S3
    print(f"Uploading {archive_name} to {bucket_name}...")
    s3.upload_file(archive_name, bucket_name, archive_name)
    print("Backup successful!")
 
# backup_to_s3('/var/www/html', 'my-devops-backups')

Uploading backup-2026-04-10.tar.gz to my-devops-backups...
Backup successful!

import re
 
def extract_errors(log_file):
    error_pattern = re.compile(r".*(ERROR|CRITICAL).*", re.IGNORECASE)
    
    with open(log_file, 'r') as f:
        errors = [line.strip() for line in f if error_pattern.match(line)]
    
    print(f"Found {len(errors)} critical issues:")
    for err in errors[:3]: # Show first 3
        print(f"  - {err}")
 
# extract_errors('app.log')

Found 12 critical issues:
  - 2026-04-10 12:01:04 ERROR: Database connection failed
  - 2026-04-10 12:05:12 CRITICAL: Out of memory on node-01
  - 2026-04-10 12:10:00 ERROR: Authentication service unreachable

from kubernetes import client, config
 
def audit_pods(namespace="default"):
    config.load_kube_config()
    v1 = client.CoreV1Api()
    
    pods = v1.list_namespaced_pod(namespace)
    print(f"Auditing pods in {namespace}...")
    
    for pod in pods.items:
        for status in pod.status.container_statuses:
            if status.restart_count > 5:
                print(f"ALERT: Pod {pod.metadata.name} has {status.restart_count} restarts!")
 
# audit_pods("production")

Auditing pods in production...
ALERT: Pod payment-processor-6789fb has 14 restarts!
ALERT: Pod redis-master-0 has 8 restarts!