Random things from WWG @wewearglasses-blog - Tumblr Blog

Add some headers for uwsgi (flask/django) app in nginx

location @app{ include uwsgi_params; uwsgi_pass unix:/tmp/zana_website.sock; uwsgi_param HTTP_X_company 'WWG'; }

Must use HTTP_ to set it as header. The header will be passed in as X-Company, capitalized. with _ changed to -. The X_ part is not compulsory but it is a convention to have it.

#python #django #flask #nginx #server #uwsgi

lftp mirror folder

mirror -R --only-newer --parallel=5 LOCAL REMOTE

#lftp #linux

Flask Request URL/Paths

There isn’t any documentation for Flask’s request (because it is from werkzeug, not really part of Flask). From time to time I need to get some path related attributes from request. Once for all, I document it here

http://localhost:8080/update/all?id=123

host: localhost:8080

host_url: http://localhost:8080/

base_url: http://localhost:8080/update/all?

path: /update/all

full_path: /update/all?id=123

#flask #python #werkzeug #documentation

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“In the pay-per-pageview model, every post is a conflict of interest.” Excerpt From: Holiday, Ryan. “Trust Me, I'm Lying: Confessions of a Media Manipulator.” Penguin Group, 2012-07-18T16:00:00+00:00. iBooks. This material may be protected by copyright.

When there are no rules there are no loopholes.

vim configurations

After tying all sorts of advanced IDE, I’m going back to vim again. I coded best using vim when I was programming ActionScript 2. I could remember all the libraries and function names without any code hinting. Maybe all the advanced IDE’s had made me lazy and sloppy.

This .vimrc file is based off https://github.com/vinitkumar/.vim. Please follow the installation instruction there and replace the .vimrc with the following one. I removed some golang related bundles, set the default color theme to fruity, set the default font and standardized tab sizes for all filetype. Please let know if there is anything else can be improved

#vim #vimrc #programming #ide

ffempg GIF with palette

Join a few images into a gif. Name your images as 1.jpg, 2.jpg and 3.jpg etc. If not make changes to "%d.jpg" part to suit you needs.

The command first join the images into a video, "out.mp4"

Then it will generate a color palette from the video file

Last, it converts the video into a gif file using the palette it generated.

!/bin/sh palette="/tmp/gif-pallet.png" filters="fps=2.0,scale=300:-1:flags=lanczos" ffmpeg -framerate 2 -i “%d.jpg” -y out.mp4 ffmpeg -v warning -i out.mp4 -vf "$filters,palettegen=stats_mode=full" -y $palette ffmpeg -i out.mp4 -i $palette -lavfi "$filters [x]; [x][1:v] paletteuse" -y out.gif

#ffmpeg #gif #command

hyperallergic

People who encountered a vending machine dispensing free compliments in the Meatpacking District or a group of women knitting and unraveling white aprons in Union Square over the weekend might have considered them part of New York City’s continually anomalous street life, or felt an odd pang of déjà vu. This year’s edition of the annual Art in Odd Places (AiOP) festival, which presents art interventions along 14th Street in Manhattan from the Hudson River to Avenue C, was titled Recall. Held October 7 to 11 and curated by Sara Reisman and Kendal Henry, its 47 artists were selected from the previous decade of AiOP festivals.

Art in Odd Places Revisits a Decade of Fleeting Experiences

Useful commands for CUPS

After updating the printer’s driver, I encountered some problem printing via CUPS. The system always give “the paper size is not supported” error. I used to use “Custom.WIDTHxHEIGHT” convention to set the media size. However, no matter how I tweak the numbers the printer refuses to print. After searching online for a while, I found out the follow commands to get the right parameters to use. Directly copy and paste one option from the list shown by “lpoptions -l” did the trick.

List connected printers

lpstat -d

Get status of the printer

lpoptions

Get paper size(media) supported by the printer

lpoptions -l

#cups #printer #driver #programming

All about domains and hostings for business owners

As a business owner, you must have a domain name for your company. You may not need a website but at least you need a respectable email address ([email protected] is not a good choice).

I have been helping my clients managing their domains for many years and I have seen so much trouble they had gone through when they let a third party vendor to manage their domains. Here is my guide on how to setup domains by yourself.

Disclaimer: I am NOT affiliated with any of the hosting companies mentioned in this article.

Reasons why you should manage your domain yourself

Whoever manages your domain may disappear (leave the company, got angry with you or other unfortunate events). It is very difficult to get your domain back. You may not know where to start.

Whoever has the control over your domain can potentially read all your emails. Some of the email hosts do not encrypt the email. The admin can download all the emails of all accounts.

You can easily make changes on your email or hosting service when needed.

Domain Registrar

To register a domain, you need to go through a domain registrar. They are like the government body where you register your company (like ACRA in Singapore). The difference is that there are many domain registrars world wide. Although there are regulations on running a domain registrar business but you can never trust them more than trusting your government (if you ever trust your government). You need to pick a reliable one. I recommend godaddy.com at the moment.

Domain Transfer

When you transfer domain from one company to another, you are actually changing domain registrars. All the domains are locked by default preventing from other people stealing them. When you want to transfer your domain from Registrar A to Registrar B, you need to unlock the domain first. This was normally done through an online control panel they provide. You will be given a code (password) when the domain is unlocked. The code (password) is then used to authenticate you as the rightful owner when you do the transfer at your new registrar.

Web Hosting Server

Domain and hosting are commonly mistaken as one thing. They are not. A domain is like the operation permit of a company. You need to let the domain registrar know where your operating office's address, which is the IP address of the web hosting server.

When a person visits your domain, the computer will get the web server address from your domain registrar. Then the computer will call the hosting server to download and display your website content.

Email Hosting Server

Similar to web hosting, the email hosting server address is also recorded at your domain registrar. When an email is sent to you, the email software will get the address of your email server from your domain registrar and send it over.

You should buy the email hosting service from your web hosting provider to avoid any troubles configure the server again, fumbling with IP address and tons of new jargons like MX, A-name, etc.

From the control panel provided by your hosting/email provider, you can easily find out where to add/remove more emails and how to setup outlook/mail to get your emails to your machine/phone.

Auto-renewal

If you have chosen a reputable domain registrar, they always have auto-renew function enabled by default. On your end, you need to make sure to update your credit card information when your credit card expires or changes. They will notify you if there is anything wrong and do not take their emails lightly. Treat them like letters from the government.

#hosting #web #domain #email #server #godaddy #google #tips #guide #business owner #business

Install PIL on CentOS

Had some problem getting PIL running properly on CentOS x64 machine. Here are a few things I found out.

Do not use pip install pillow or PIL, use yum install python-imaging instead. This may be mainly a issue of my python version is 2.6 and the pip is outdated.

In CentOS, the dev package is named as “-devel” not “-dev”. If I tried “yum search” first, I would have saved more time guessing the package names. (Note to my self: need to learn more about the tools)

Because the image is 64 bit, the libraries are installed in /usr/lib64 folder and some scripts do not know the path and only tries /usr/lib folder. You may need to symbol link the libraries from “lib64″ folder into “lib” folder.

First, make sure all these libraries are installed:

libpng-devel

zlib-devel

libfreetype-devel

libjpeg-devel

Then use “yum install python-imaging”

Then it’s done!

#centos #python #pil #imaging #linux #unix #yum

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