jahio

// Place your settings in this file to overwrite the default settings
{
  "editor.rulers": [80, 100],
  "editor.tabSize": 2,
  "editor.insertSpaces": true,
  "editor.mouseWheelZoom": true,
  "editor.fontLigatures": true,
  "editor.renderIndentGuides": true,
  "editor.codeLens": true,
  "diffEditor.ignoreTrimWhitespace": false,

jahio

Notes on making USB disks from the macOS Console

Since Apple destroyed the awesome tool that was Disk Utility in the pre-Capitan days, we now have to resort to this kind of lunacy to do what used to be a simple task. Way to go, Apple. You're making Microsoft look borderline useful with these kinds of fuck-ups, and I find myself gravitating toward the power, consistency and flexibility I can get with Linux with each passing day. Get your shit together.

...anyway...

tl;dr

jahio

#!/usr/bin/env $SHELL
alias lsblk="lsblk -o MODEL,VENDOR,NAME,LABEL,SIZE,MOUNTPOINT,FSTYPE"
alias gramps="nix-env -p /nix/var/nix/profiles/system --list-generations"
alias nixos-rebuild="nixos-rebuild -j 6 --cores 8"
      #
      # -j is how many "jobs" or simultaneous computational processes run in tandem
      # --cores is how many CPU cores you want to use
      # How do you get these values? `cat /proc/cpuinfo` and look at the number of
      # returned "CPUs". They're zero indexed, so if you get the last one as object
      # number seven (7), you have 8 cores.

jahio

<div>
  <input type=“text” placeholder=“Username”>
</div>

<div>
  <input type=“password” placeholder=“Password”>
</div>

<div>
  <input type=“submit” value=“Login”>

jahio

#!/usr/bin/env zsh

export NAMESRV_ADDR="localhost:9876"
export ROCKETMQ_HOME="/Users/jah/Applications/rocketmq"

ORIGINAL_DIR=$(pwd)

cd $ROCKETMQ_HOME 
# Purge nohup.out so we can have a fresh log for each session
if [[ -f nohup.out ]]

jahio

#!/usr/bin/env zsh

export NAMESRV_ADDR="localhost:9876"
export ROCKETMQ_HOME="/Users/jah/Applications/rocketmq"

ORIGINAL_LOCATION=$(pwd)

cd $ROCKETMQ_HOME
bin/mqshutdown broker
bin/mqshutdown namesrv

jahio

---
apiVersion: v1
kind: ServiceAccount
metadata:
  namespace: tweed
  name:      broker

---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole

jahio

LInux

Three system configuration parameters must be set to support a large number of open files and TCP connections with large bursts of messages. Changes can be made using the /etc/rc.d/rc.local or /etc/sysctl.conf script to preserve changes after reboot.

1. /proc/sys/fs/file-max: The maximum number of concurrently open files.

fs.file-max = 1000000

2. /proc/sys/net/ipv4/tcp_max_syn_backlog: Maximum number of remembered connection requests, which are still did not receive an acknowledgment from connecting client. The default value is 1024 for systems with more than 128Mb of memory, and 128 for low memory machines.

net.ipv4.tcp_max_syn_backlog = 3240000

3. /proc/sys/net/core/somaxconn: Limit of socket listen() backlog, known in userspace as SOMAXCONN. Defaults to 128.

net.core.somaxconn = 3240000

jahio

#!/usr/bin/env bash

# Uses `ps` from $PATH (usually /usr/bin/ps) to get processes, then filters
# those by how much rss they're using; anything lower than the amount defined
# below as $THRESHOLD is discarded. Outputs JSON to STDOUT. No arguments.

declare -a pids
declare -a cmds
declare -a rss

jahio

#!/usr/bin/env pwsh

# Uses Get-Process piped to some stuff to get a list of processes
# over a certain amount of memory and output those as JSON.
# Takes no arguments.

# NOTE: This threshold is defined as BYTES, not KILOBYTES like the shell script.
# Adjust the math accordingly.

$threshold = (200 * 1024) * 1024 # Don't report anything greater than 200MB