alex2006hw

tmux shortcuts & cheatsheet

start new:

tmux

start new with session name:

tmux new -s myname

alex2006hw

The introduction to Reactive Programming you've been missing

(by @andrestaltz)

So you're curious in learning this new thing called Reactive Programming, particularly its variant comprising of Rx, Bacon.js, RAC, and others.

Learning it is hard, even harder by the lack of good material. When I started, I tried looking for tutorials. I found only a handful of practical guides, but they just scratched the surface and never tackled the challenge of building the whole architecture around it. Library documentations often don't help when you're trying to understand some function. I mean, honestly, look at this:

Rx.Observable.prototype.flatMapLatest(selector, [thisArg])

Projects each element of an observable sequence into a new sequence of observable sequences by incorporating the element's index and then transforms an observable sequence of observable sequences into an observable sequence producing values only from the most recent observable sequence.

alex2006hw

# sfdisk -d /dev/xvdb to obtain disk geometry output to use below
# 
# Format ephemeral disk into partition for swap on /dev/xvdb2

sfdisk /dev/xvdb <<EOF
unit: sectors

/dev/xvdb1 : start=     2048, size=209715200, Id=83

alex2006hw

#!/bin/sh

DEBUG=""
DATE=$(date +%Y-%m-%d)
HOSTNAME=`/bin/hostname`
AMINAME="$DATE-$HOSTNAME-AMI"
AMIDESC="$HOSTNAME backup to AMI on $DATE"

EC2_INSTANCE_ID="`wget -q -O - http://169.254.169.254/latest/meta-data/instance-id || die \"wget instance-id has failed: $?\"`"
test -n "$EC2_INSTANCE_ID" || die 'cannot obtain instance-id'

alex2006hw

en
conf t
aaa new-model
aaa authentication login default local
aaa authorization exec default local 
aaa session-id common
ip ssh version 2
ip domain-name alex2006hw.com
hostname alex2006hw-switch1
crypto key gen rsa gen mod 1024

alex2006hw

```
wget http://aspersa.googlecode.com/svn/trunk/rel
wget http://aspersa.googlecode.com/svn/trunk/align
chmod +x rel align
while sleep 1; do grep sdb1 /proc/diskstats; done > stats
```

# CTRL-C after a while
```
echo m m dev  reads   rd_mrg rd_sectors ms_reading \

alex2006hw

#######################################################
###  copy from Calomel.org  /etc/nginx.conf  BEGIN
#######################################################

#
worker_processes     4;     # one(1) worker or equal the number of _real_ cpu cores. 4=4 core cpu
worker_priority      15;    # renice workers to reduce priority compared to system processes for
                            # machine health. worst case nginx will get ~25% system resources at nice=15
#worker_rlimit_nofile 1024; # maximum number of open files

alex2006hw

#######################################################
###  copy from Calomel.org  /etc/nginx.conf  BEGIN
#######################################################

#
worker_processes     4;     # one(1) worker or equal the number of _real_ cpu cores. 4=4 core cpu
worker_priority      15;    # renice workers to reduce priority compared to system processes for
                            # machine health. worst case nginx will get ~25% system resources at nice=15
#worker_rlimit_nofile 1024; # maximum number of open files

alex2006hw

#######################################################
### copy from Calomel.org  /etc/nginx.conf  BEGIN
#######################################################
#
worker_processes     4;     # one(1) worker or equal the number of _real_ cpu cores. 4=4 core cpu
worker_priority      15;    # renice workers to reduce priority compared to system processes for
                            # machine health. worst case nginx will get ~25% system resources at nice=15
#worker_rlimit_nofile 1024; # maximum number of open files

events {

alex2006hw

Content-Security-Policy: default-src 'self' ajax.googleapis.com XXX.com YYY.com

http://caniuse.com/#feat=contentsecuritypolicy
http://www.w3.org/TR/CSP/