szaydel

It may be necessary at times to modify umask settings in order to allow for shared file access.
This sets the umask to 0022, but other variants are also possible, assuming it is a value unix umask value.

# sudo launchctl config user umask 022

szaydel

#!/usr/sbin/dtrace -qCs

#define	NT_STATUS_WRONG_PASSWORD	0xC000006A
#define	NT_STATUS_LOGON_FAILURE		0xC000006D

BEGIN
{
	printf("%-32s %s\n", "USER", "IP");
}

szaydel

#!/bin/sh
# MIT License
#
# Copyright (c) 2017 RackTop Systems / Sam Zaydel.
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is

szaydel

; fio profile for basic sanity validation of configured system.

[global]
ioengine=solarisaio
; ioengine=linuxaio
; ioengine=libaio
; fsync=16
; rw=read
iodepth=16
; rw=randrw ; Random IO

szaydel

package main

import (
    "fmt"
)

func main() {
    fmt.Println("Hello, What's your favorite number?")
    var i int
    fmt.Scanf("%d\n", &i)

szaydel

dtrace -qn '
/* Result is a CSV with three columns: 
1) path,
2) count of open(s) without matching close(s) 
3) number of times opened*/
int self fd[int];
string self path;
BEGIN {
start = timestamp;
}

szaydel

dtrace -qn '
  BEGIN {
    printf("timestamp(ns),latency(us),iotype,device,filename,blk.number,blk.count");
  }
  io:::start {
    ts[args[0]->b_edev, args[0]->b_blkno] = timestamp;
  }
  io:::done /ts[args[0]->b_edev, args[0]->b_blkno] != 0/ {
    this->lat_us = (timestamp - ts[args[0]->b_edev, args[0]->b_blkno]) 
                    / 1000;

szaydel

Unix domain socket server and client There are three types of unix domain socket.

"unix" corresponds to SOCK_STREAM "unixdomain" corresponds to SOCK_DGRAM "unixpacket" corresponds to SOCK_SEQPACKET When you write a “unix” or “unixpacket” server, use ListenUnix().

 l, err := net.ListenUnix("unix",  &net.UnixAddr{"/tmp/unixdomain", "unix"})

szaydel

The following steps allow one to either read data from L0 block directly or after converting DVA to physical device address, read data from device instead with dd.

We'll pretend that we have pool p03 with dataset path: p03/global/data0. We have a single file on this data0 dataset, called words. It is basically a list of words, the good'ol unix dictionary.

1. Get information with zdb about dataset, we want to get list of indirect blocks.

# zdb -AA -ddddd p03/global/data0
...snip...
    Object  lvl   iblk   dblk  dsize  lsize   %full  type
        14    2   128K   128K  19.8M  19.8M  100.00  ZFS plain file

szaydel

#!/usr/bin/env bash

runtime=60
interval=10

while getopts i:t: name; do
    case $name in
    i)  interval="$OPTARG";;
    t)  runtime="$OPTARG";;
    ?)  printf "Usage: %s: [-i <value>] [-t <value>]\n" "$0"