A Summer of Scripting and Troubleshooting

July 11, 2005. It’s been a whirlwind month in tech—Xen hypervisor is hot, Google’s hiring spree is underway, Firefox hits the streets, and web 2.0 starts to buzz like crazy. But here on my desk, I’m knee-deep in shell scripts and Python code, wrestling with the sysadmin’s never-ending battle: keeping our servers humming without breaking anything.

The day before, we launched a new feature that was supposed to be a game-changer for our site. We were confident—after all, it was built on solid LAMP architecture, and everything seemed to work in testing. But Murphy’s Law had other plans. The first wave of traffic hit, and disaster struck. Our database servers were creaking under the strain, and we were getting error messages like “Too Many Connections.” Panic set in, but I knew better than to let fear dictate my actions.

I pulled up a few of our old scripts, some Perl ones that I wrote for monitoring and logging. They hadn’t been touched in months, so they were a bit rusty. But it was time to dust them off. The first thing I did was run a script to check the current database connections:

psql -l | grep "connections" | awk '{print $3}' > /tmp/conn.txt

After getting those numbers, I started digging into the logs. It’s always a bit of a hunt, but this time I found some interesting patterns. It seemed that a particular cron job was running every minute and hitting the database too hard. That explained the connection issues! I quickly whipped up a Python script to throttle that cron job:

import time

while True:
    print("Cron Job Running")
    time.sleep(60)  # Sleep for one minute

Once I tested this in our staging environment, everything looked good. I scheduled the new version of the cron job and waited for it to take effect.

But then came another issue: the web servers were slow. We had a few PHP scripts that were supposed to be lightweight but turned out to have some performance bottlenecks. Time for more scripting. I wrote a simple load balancer in Python using gevent to handle requests more efficiently:

from gevent import monkey; monkey.patch_all()
import gevent
from flask import Flask, request

app = Flask(__name__)

@app.route('/')
def index():
    return "Hello from our improved server!"

if __name__ == "__main__":
    greenlets = [gevent.spawn(app.run) for _ in range(10)]
    gevent.joinall(greenlets)

I deployed this with a bit of trepidation but it seemed to do the trick. The load on the servers eased up, and we didn’t see as many timeouts.

This summer has been a lot of work, but also incredibly rewarding. I feel like a sysadmin in the age of scripting, where automation is key. It’s no longer about just turning lights on and off; it’s about writing clean, efficient code that can handle whatever comes our way. And sometimes, it means going back to old scripts, tweaking them, and making sure they still work.

As I sit here late into the night, debugging yet another issue, I’m reminded of why I love this job: the challenge, the problem-solving, and the joy of making something better with each line of code. And while tech moves on, these experiences are what make every day worthwhile.

Stay tuned for more adventures in scripting and sysadmin-ing!