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

[isayme]
text(bold)=eaeaea
magenta(bold)=ff00ff
text=ffffff
white(bold)=eaeaea
green=00c000
red(bold)=d20000
green(bold)=00ff00
black(bold)=808080
red=c00000

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

替换上你的Email，密码，域名ID，记录ID等参数，就可以运行了。 会在后台一直运行，每隔30秒检查一遍IP，如果修改了就更新IP。

获得domain_id可以用curl curl -k https://dnsapi.cn/Domain.List -d "login_email=xxx&login_password=xxx"

获得record_id类似 curl -k https://dnsapi.cn/Record.List -d "login_email=xxx&login_password=xxx&domain_id=xxx"

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