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Kafka Topics

List existing topics

bin/kafka-topics.sh --zookeeper localhost:2181 --list

Describe a topic

bin/kafka-topics.sh --zookeeper localhost:2181 --describe --topic mytopic

Purge a topic

bin/kafka-topics.sh --zookeeper localhost:2181 --alter --topic mytopic --config retention.ms=1000

... wait a minute ...

lananhbk168

Adjusting child processes for PHP-FPM (Nginx)

When setting these options consider the following:

• How long is your average request?
• What is the maximum number of simultaneous visitors the site(s) get?
• How much memory on average does each child process consume?

Determine if the max_children limit has been reached.

• sudo grep max_children /var/log/php?.?-fpm.log.1 /var/log/php?.?-fpm.log

lananhbk168

Intro

TCL-Expect scripts are an amazingly easy way to script out laborious tasks in the shell when you need to be interactive with the console. Think of them as a "macro" or way to programmaticly step through a process you would run by hand. They are similar to shell scripts but utilize the .tcl extension and a different #! call.

Setup Your Script

The first step, similar to writing a bash script, is to tell the script what it's executing under. For expect we use the following:

#!/usr/bin/expect

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#!/usr/bin/python

# Modified by Travis Lee
# Last Updated: 4/21/14
# Version 1.16
#
# -changed output to display text only instead of hexdump and made it easier to read
# -added option to specify number of times to connect to server (to get more data)
# -added option to send STARTTLS command for use with SMTP/POP/IMAP/FTP/etc... 
# -added option to specify an input file of multiple hosts, line delimited, with or without a port specified (host:port)

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import BaseHTTPServer
from SimpleHTTPServer import SimpleHTTPRequestHandler
import sys
import base64

key = ""

class AuthHandler(SimpleHTTPRequestHandler):
    ''' Main class to present webpages and authentication. '''
    def do_HEAD(self):

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from datetime import datetime, time

def dateDiffInSeconds(date1, date2):
  timedelta = date2 - date1
  return timedelta.days * 24 * 3600 + timedelta.seconds

def daysHoursMinutesSecondsFromSeconds(seconds):
	minutes, seconds = divmod(seconds, 60)
	hours, minutes = divmod(minutes, 60)
	days, hours = divmod(hours, 24)

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// Setting up an IRC server on Cent 6

// Create a user and group for this guy
$ groupadd ircadmin && useradd -m -g ircadmin -s /bin/bash ircadmin

// Make a working directory (/var/source/)
mkdir source && cd source

// Grab the latest versions of Anope and UnrealIRCd
$ wget http://www.unrealircd.com/downloads/Unreal3.2.9.tar.gz http://downloads.sourceforge.net/project/anope/anope-stable/Anope%201.8.7/anope-1.8.7.tar.gz

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require 'gollum/frontend/app'
require 'digest/sha1'

class App < Precious::App
  User = Struct.new(:name, :email, :password_hash, :can_write)

  before { authenticate! }
  before /^\/(edit|create|delete|livepreview|revert)/ do authorize_write! ; end

  helpers do