huangsam

from datetime import datetime
from random import randint
from time import sleep

from flask import Flask, jsonify, render_template


app = Flask(__name__)

huangsam

function ssh_tunnel() {
    target_host="$1"
    target_port="$2"
    tunnel_host="$3"
    source_port="$4"
    [[ `ps axu | grep $target_port | grep ssh` ]] && return
    ssh -Nf -L "$source_port:$target_host:$target_port" "$tunnel_host"
}

huangsam

#!/bin/bash
# kafka-demo.sh: A playground for running Kafka on a Docker container
# https://www.tutorialspoint.com/apache_kafka/apache_kafka_basic_operations.htm

# Initialization step
# openjdk:8 image uses the following software:
# Java 1.8.0_212 and Debian 9 (stretch)
docker run --rm -it --name kafka openjdk:8 bash

# All the commands below are run within the Docker container

huangsam

Official links:

• User guide as PDF
• Official code snippets

Codebase links:

• platypus.doctemplate
• platypus.flowables
• pdfgen.canvas

huangsam

import dns.message
import dns.name
import dns.rdatatype
import dns.query


def do_work(target, nameserver):
    qname = dns.name.from_text(target)
    responses = []
    for dtype in (dns.rdatatype.A, dns.rdatatype.NS):

huangsam

#!/bin/bash

yum install bind bind-utils -y
vi /etc/named.conf
vi /var/named/mydomain.com.zone

systemctl start named
systemctl status named

dig @localhost mydomain.com

huangsam

import dns.message
import dns.name
import dns.rdatatype
import dns.query


def do_work(target, nameserver):
    qname = dns.name.from_text(target)
    responses = []
    for dtype in (dns.rdatatype.A, dns.rdatatype.NS):

huangsam

all: complex simple
complex: complex.go
	go build complex.go
simple: simple.go
	go build simple.go
clean:
	rm complex simple

huangsam

#!/bin/bash
find . -name 'meta-*.yml' | xargs awk -F':' -f metadata.awk

huangsam

package main

import "fmt"

func main() {
	jobs := make(chan int)
	done := make(chan bool)

	// Wait for job and send done signal
	go func() {