yinheli

Android Emulator (ARM64) on EC2 - 2022
---------------------------------------
1. Launch EC2 ARM based Instance (a1.metal / a1.2xlarge): (16 Gb RAM, 32Gb Disk), Ubuntu Server 22.04 LTS (HVM) ARM x64
2. sudo apt update && sudo apt upgrade
3. sudo apt install default-jdk python3-pip repo python-is-python3 unzip libpcre2-dev adb
4. wget https://dl.google.com/android/repository/commandlinetools-linux-8512546_latest.zip 
5. unzip commandlinetools-linux-8512546_latest.zip -d android-sdk
6. sudo mv android-sdk /opt/
7. mkdir /opt/android-sdk/cmdline-tools/latest
8. mv /opt/android-sdk/cmdline-tools/* /opt/android-sdk/cmdline-tools/latest  (ignore the error)

yinheli

How to compress PDF using ghostscript

As a developer, it bothers me when someone sends me a large pdf file compared to the number of pages. Recently, I recieved a 12MB scanned document for just one letter-sized page... so I got to googlin, like I usually do, and found ghostscript!

to learn more abot ghostscript (gs): https://www.ghostscript.com/

What we are interested in, is the gs command line tool, which provides many options for manipulating PDF, but we are interested in compressign those large PDF's into small yet legible documents.

credit goes to this answer on askubuntu forum: https://askubuntu.com/questions/3382/reduce-filesize-of-a-scanned-pdf/3387#3387?newreg=bceddef8bc334e5b88bbfd17a6e7c4f9

yinheli

import javax.net.ssl.SSLSocket;
import javax.net.ssl.SSLSocketFactory;
import java.io.*;

/** Establish a SSL connection to a host and port, writes a byte and
 * prints the response. See
 * http://confluence.atlassian.com/display/JIRA/Connecting+to+SSL+services
 */
public class SSLPoke {
    public static void main(String[] args) {

yinheli

# Example usage with several configuration sets as in multiple connections durations and threads. 
# You may go take the rest of the day off while this will run ;)

for duration in 10s 1m 10m 1h
do 
  for connections in 100 200 300 400 500 600
  do
    for thread in 1 2 3 4 5
    do
      wrk -d$duration -c$connections -t$thread -s wrk-script.lua http://localhost:4001/beacon/0001/demo-load-test/test/web

yinheli

package main

import (
	"fmt"
	"io"
	"io/ioutil"
	"net"
	"os"
	"strings"

yinheli

package main

import (
	"log"
	"bufio"
	"time"
	"os"
	"fmt"
	"io"
	"net"

yinheli

#
# This config file is a combination of ideas from:
#   http://www.37signals.com/svn/posts/1073-nuts-bolts-haproxy
#   http://www.igvita.com/2008/05/13/load-balancing-qos-with-haproxy/
#   http://wiki.railsmachine.com/HAProxy
#   http://elwoodicious.com/2008/07/15/nginx-haproxy-thin-fastcgi-php5-load-balanced-rails-with-php-support/
#   http://upstream-berlin.com/2008/01/09/using-haproxy-with-multiple-backends-aka-content-switching/
#   http://wiki.railsmachine.com/HAProxy
#   http://gist.github.com/raw/25482/d39fb332edf977602c183194a1cf5e9a0b5264f9
#

yinheli

# in case of conflict with local nginx:
# make sure in all *.confs (
#   also in default and example to avoid error like 
#     'nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Address already in use)'
# )
# set for instance "listen 127.0.0.1:80" instead of "listen *:80"

# docker & network settings
DOCKER_IMAGE_NAME="maxexcloo/nginx-php"                 # build of nginx-php - for example
DOCKER_CONTAINERS_NAME="nginx_bridged"                  # our container's name

yinheli

[unix_http_server]
file=/tmp/supervisor.sock                       ; path to your socket file

[supervisord]
logfile=/var/log/supervisord/supervisord.log    ; supervisord log file
logfile_maxbytes=50MB                           ; maximum size of logfile before rotation
logfile_backups=10                              ; number of backed up logfiles
loglevel=error                                  ; info, debug, warn, trace
pidfile=/var/run/supervisord.pid                ; pidfile location
nodaemon=false                                  ; run supervisord as a daemon

yinheli

" copy all this into a vim buffer, save it, then...
" source the file by typing :so %
" Now the vim buffer acts like a specialized application for mastering vim

" There are two queues, Study and Known.  Depending how confident you feel
" about the item you are currently learning, you can move it down several
" positions, all the way to the end of the Study queue, or to the Known
" queue.

" type ,, (that's comma comma)