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This.isDevOps(powah_code=36)

Thuan Duong thuandt

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This.isDevOps(powah_code=36)
  • Ho Chi Minh, Vietnam
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@thuandt
thuandt / no_accent_vietnamese.py
Created Aug 22, 2012
Chuyển đổi từ Tiếng Việt có dấu sang Tiếng Việt không dấu
View no_accent_vietnamese.py
#!/usr/bin/env python
# -*- coding: utf-8 -*-
"""Chương trình chuyển đổi từ Tiếng Việt có dấu sang Tiếng Việt không dấu
Chỉnh sửa từ mã nguồn của anh NamNT
http://www.vithon.org/2009/06/14/x%E1%BB%AD-ly-ti%E1%BA%BFng-vi%E1%BB%87t-trong-python
"""
import re
INTAB = "ạảãàáâậầấẩẫăắằặẳẵóòọõỏôộổỗồốơờớợởỡéèẻẹẽêếềệểễúùụủũưựữửừứíìịỉĩýỳỷỵỹđẠẢÃÀÁÂẬẦẤẨẪĂẮẰẶẲẴÓÒỌÕỎÔỘỔỖỒỐƠỜỚỢỞỠÉÈẺẸẼÊẾỀỆỂỄÚÙỤỦŨƯỰỮỬỪỨÍÌỊỈĨÝỲỶỴỸĐ"
@thuandt
thuandt / install_xenserver_usb.md
Created Oct 30, 2013
Create XenServer USB Install
View install_xenserver_usb.md

Installing XenServer 6.2.0 from a USB Stick

  • Download the XenServer 6.2.0 ISO image

  • Format a USB stick using FAT32.

  • Use unetbootin to install the ISO to the USB stick. Use the “DiskImage” option instead of the “Distribution” one, and point it right to the ISO file.

  • Now we need to fix up some boot stuff (All paths are relative to the root of the USB drive)

View openwrt-setup.sh
#!/bin/sh
# Setup OpenWRT router
set -e
if [ -f /etc/upgraded ]; then
echo "router has been configured properly!"
else
if ping -q -c 1 -W 1 8.8.8.8 >/dev/null; then
echo "start reconfigure router"
@thuandt
thuandt / st_icon_512.png
Last active Apr 1, 2020
Replace Sublime Text Icon in Ubuntu
View quick-tips-optimizing-jvm.md

Quick Tips for Fast Code on the JVM

I was talking to a coworker recently about general techniques that almost always form the core of any effort to write very fast, down-to-the-metal hot path code on the JVM, and they pointed out that there really isn't a particularly good place to go for this information. It occurred to me that, really, I had more or less picked up all of it by word of mouth and experience, and there just aren't any good reference sources on the topic. So… here's my word of mouth.

This is by no means a comprehensive gist. It's also important to understand that the techniques that I outline in here are not 100% absolute either. Performance on the JVM is an incredibly complicated subject, and while there are rules that almost always hold true, the "almost" remains very salient. Also, for many or even most applications, there will be other techniques that I'm not mentioning which will have a greater impact. JMH, Java Flight Recorder, and a good profiler are your very best friend! Mea

@thuandt
thuandt / deployment-tool-ansible-puppet-chef-salt.md Choosing a deployment tool - ansible vs puppet vs chef vs salt
View deployment-tool-ansible-puppet-chef-salt.md

Requirements

  • no upfront installation/agents on remote/slave machines - ssh should be enough
  • application components should use third-party software, e.g. HDFS, Spark's cluster, deployed separately
  • configuration templating
  • environment requires/asserts, i.e. we need a JVM in a given version before doing deployment
  • deployment process run from Jenkins

Solution

View useful_pandas_snippets.py
# List unique values in a DataFrame column
# h/t @makmanalp for the updated syntax!
df['Column Name'].unique()
# Convert Series datatype to numeric (will error if column has non-numeric values)
# h/t @makmanalp
pd.to_numeric(df['Column Name'])
# Convert Series datatype to numeric, changing non-numeric values to NaN
# h/t @makmanalp for the updated syntax!
@thuandt
thuandt / random-crontab.md
Created Jan 9, 2017
Random delay for cron.daily, cron.weekly, cron.monthly
View random-crontab.md

Random delay for cron.daily, cron.weekly, cron.monthly

Source

Wouldn’t it be nice if cron’s daily, weekly and monthly jobs could be run with a slight offset? At least that’s what I thought when 20+ servers were hitting my backup infrastructure at once. The scripts in /etc/cron.daily, /etc/cron.weekly and /etc/cron.monthly are triggered directly from crontab at fixed times. Here’s what /etc/crontab looks like in Ubuntu Server 16.04:

@thuandt
thuandt / python_random_item.md
Created Jan 11, 2013
Select a random item from a list/tuple/data stucture in Python
View python_random_item.md

One of the most common tasks that requires random action is selecting one item from a group, be it a character from a string, unicode, or buffer, a byte from a bytearray, or an item from a list, tuple, or xrange. It’s also common to want a sample of more than one item.

Don’t do this when randomly selecting an element

A naive approach to these tasks involves something like the following; to select a single item, you would use randrange (or randint) from the random module, which generates a pseudo-random integer from the range indicated by its arguments:

import random
 
items = ['here', 'are', 'some', 'strings', 'of',
@thuandt
thuandt / XenServer-software-RAID1.md
Last active Jun 4, 2017
Instructions for switching to RAID 1 for XenServer 6.2 with GPT
View XenServer-software-RAID1.md

Instructions for switching to RAID 1 for XenServer 6.2 with GPT

  • Create new partition for Local Storage
# gdisk /dev/sda
  • Check /dev/sda partition table