stephanGarland

# create a simple dataset with a small record size, and chown it

❯ sudo zfs create -o recordsize=512 tank/foobar && sudo chown $YOUR_USER:$YOUR_GROUP tank/foobar
❯ cd tank/foobar

# make a 1K file filled with hex FF (pull from /dev/zero, then use tr to translate to FF, which is 377 in octal)
# if it's just zeros, there isn't much to look at with zdb
❯ dd if=/dev/zero bs=1k count=1 | tr "\000" "\377" >file.txt
1+0 records in
1+0 records out

stephanGarland

# ChatGPT output surrounded by ``` fence

I'm going to give you some simple MySQL 8 schema, and then values to fill it with.
The table creation will be from the output of SHOW CREATE TABLE <table>,
but the values will be of a simpler format, like this:

<table> = {
col_name:col_type
value
}

stephanGarland

DELIMITER // -- This is needed so that the individual commands don't end the stored procedure
CREATE PROCEDURE insert_zaps(IN num_rows int, IN pct_shared float) -- Two input args are needed
BEGIN
  DECLARE loop_count bigint; -- Variables are initialized with a type
  DECLARE len_table bigint;
  DECLARE rand_base float;
  DECLARE rand_offset float;
  DECLARE rand_ts timestamp;
  DECLARE rand_user bigint;
  DECLARE shared_with_user bigint;

stephanGarland

import argparse
from collections import deque
from concurrent.futures import ProcessPoolExecutor, ThreadPoolExecutor, wait
from math import floor
from multiprocessing import Value
from os import urandom
import random

class Allocator:
    def __init__(self, id_max: int):

stephanGarland

Examining MySQL 8.0.23 with strace during SELECT COUNT(*), TRUNCATE TABLE, and DROP TABLE operations

Notes

• Ran on a Proxmox VM on a Dell R620 with dual E5-2650 v2, all 32 cores given to the VM, and 64 GiB of RAM allocated
• Disk was an ext4 filesystem on an HDD-based virtual disk, presented via a ZFS array in another physical server
• Captured with strace -T -ff -o /usr/local/mysql/trace /usr/local/mysql/bin/mysqld

Tests

This is running a SELECT COUNT(*), then a TRUNCATE, then a DROP, with FOREIGN_KEY_CHECKS=OFF

stephanGarland

#!/usr/bin/env bash

remove_claim() {
    pvc=$(export name="$1" && kubectl get pv --no-headers | awk -v name="$name" '$0~name {print $1}')
    kubectl patch pv $pvc --type json -p '[{"op": "remove", "path": "/spec/claimRef"}]'
}

if [ -n $2 ]; then
  namespace=$2
else

stephanGarland

#!/usr/bin/env bash
set -e

read -p "Enter Unifi controller's container name: " container
curl -s https://dlcdn.apache.org/logging/log4j/2.15.0/apache-log4j-2.15.0-bin.tar.gz -o log4j.tar.gz
mkdir -p ./log4j && tar xzf log4j.tar.gz -C ./log4j --strip-components=1
cd log4j
for file in log4j-{api,core,slf4j-impl}-2.15.0.jar; do 
	docker cp "$file" "$container:/usr/lib/unifi/lib/"
done

stephanGarland

#!/usr/bin/env python3

import datetime
import os
import socket
import subprocess
import sys
import time

MAC_ADDR = "0025904F3A00"

stephanGarland

#!/usr/bin/env python3

import argparse
from datetime import date

from PyPDF2 import PdfFileReader, PdfFileWriter
from PyPDF2.generic import BooleanObject, NameObject, IndirectObject

def setup_args():
    parser = argparse.ArgumentParser(description="Modify a PDF's fields for HSA contribution changes.")

stephanGarland

#!/usr/bin/env bash

# Replace the directory on L7 with your actual location

echo "Stopping Plex"
docker stop plex
cd "/mnt/nvme_plex/config/Library/Application Support/Plex Media Server/Plug-in Support/Databases"
existing="com.plexapp.plugins.library.db"
echo "Backing up $existing to $existing.bak"
cp $existing $existing.bak