Liren Tu tuliren

Cloudflare redirection

Example: redirect from old.com to new.com, and www.old.com to www.new.com

Add redirect rule

Go to Rules / Redirect Rules page
Create a new rule
Select Custom filter expression
Add matching rules
Field Hostname, operator equals, value old.com, or

# show
defaults write com.apple.dock desktop-picture-show-debug-text -bool TRUE  && killall Dock
# hide
defaults write com.apple.dock desktop-picture-show-debug-text -bool FALSE  && killall Dock

Install Ruby with openssl 1.0

brew switch openssl 1.0.2s
export PATH="/usr/local/opt/[email protected]/bin:$PATH"
export LDFLAGS="-L/usr/local/opt/[email protected]/lib ${LDFLAGS}"
export CPPFLAGS="-I/usr/local/opt/[email protected]/include ${CPPFLAGS}"
RUBY_CONFIGURE_OPTS=--with-openssl-dir=/usr/local/Cellar/openssl/1.0.2s/ rbenv install 2.3.0

Fix and use libxml2

Lessons from Scaling to Hundreds of Millions of Users

Tammy Butow presentation on DigitalOcean Tide SF

Before launch

Kubernetes
- 3 primaries and 3 nodes
- Docker containers
- Load balancer
Private network

Parameter	Purpose	Default
`yarn.app.mapreduce.am.resource.mb`	The physical memory requirement, in MiB, for the ApplicationMaster.	1 GiB
`mapreduce.map.memory.mb`	The amount of physical memory, in MiB, allocated for each map task of a job.	1 GiB
`mapreduce.reduce.memory.mb`	The amount of physical memory, in MiB, allocated for each reduce task of a job.	1 GiB
`mapreduce.map.java.opts`	Java opts for the map processes.	`-Djava.net.preferIPv4Stack=true`
`mapreduce.reduce.java.opts`	Java opts for the reduce processes.	`-Djava.net.preferIPv4Stack=true`
`mapred.child.java.opts`	Java opts for the map processes. It has been deprecated in Hadoop 2.0.	`-Djava.net.preferIPv4Stack=true`
`yarn.nodemanager.vmem-pmem-ratio`	Virtual / physical memory ratio. Virtual memory is allocated based on this ratio	2.1

OS X Screencast to animated GIF

This gist shows how to create a GIF screencast using only free OS X tools: QuickTime, ffmpeg, and gifsicle.

Instructions

To capture the video (filesize: 19MB), using the free "QuickTime Player" application:

	interface Base {
	base1: string;
	base2: string;
	a: string;
	}

	interface Interface1 extends Base {
	b: number;
	}

	#!/usr/bin/env bash

	set -euo pipefail
	set -x

	ROOT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
	cd "${ROOT_DIR}"

	SOURCE_CONFIG_URL="https://raw.githubusercontent.com/airbytehq/airbyte/master/airbyte-integrations/connectors/source-file/integration_tests/config.json"
	SOURCE_IMAGE_NAME="airbyte/source-file"

	{
	"\UF729" = "moveToBeginningOfLine:"; /* Home */
	"\UF72B" = "moveToEndOfLine:"; /* End */

	"$\UF729" = "moveToBeginningOfLineAndModifySelection:"; /* Shift + Home */
	"$\UF72B" = "moveToEndOfLineAndModifySelection:"; /* Shift + End */

	"\UF72C" = "moveToBeginningOfDocument:"; /* PageUp */
	"\UF72D" = "moveToEndOfDocument:"; /* PageDown */
	}

	# Show database charset
	SELECT default_character_set_name FROM information_schema.SCHEMATA
	WHERE schema_name = "<database>";

	# Chase database charset
	ALTER DATABASE <database> CHARACTER SET = utf8mb4 COLLATE = utf8mb4_unicode_ci;

	# Show table charset
	SELECT CCSA.character_set_name, T.table_name FROM information_schema.`TABLES` T,
	information_schema.`COLLATION_CHARACTER_SET_APPLICABILITY` CCSA