Alexander Karelas akarelas

You have to do 2 things in order to allow your container to access your host's postgresql database

Make your postgresql listen to an external ip address
Let this client ip (your docker container) access your postgresql database with a given user

Obs: By "Host" here I mean "the server where docker is running on".

Make your postgresql listen to an external ip address

Find your postgresql.conf (in case you don't know where it is)

$ sudo find / -type f -name postgresql.conf

If you have already taken a course in algorithms, why read Grokking Algorithms (manning.com/bhargava)?

If you were learning graph algorithms, which approach would you prefer:

Imagine you have to take public transit from your home to your office. How do you figure out the fastest route? Use graph algorithms! OR
We can choose between two standard ways to represent a graph G = (V, E): as a collection of adjacency lists or as an adjacency matrix. Either way applies to both directed and undirected graphs.

I prefer the first way: lead with lots of examples, and clear writing. The second way is an excerpt from "Introduction to Algorithms"...that's how they start their section on graph algorithms.

The introduction to Reactive Programming you've been missing

(by @andrestaltz)

This tutorial as a series of videos

If you prefer to watch video tutorials with live-coding, then check out this series I recorded with the same contents as in this article: Egghead.io - Introduction to Reactive Programming.

Redis FAQ or: what you learn when idling in #redis

First: this here is the unofficial FAQ, only containing things that come up by users in the IRC channel #redis on Freenode. There's also a more official FAQ. This document is also available on my site.

X is weird in my instance. Can you help?

Maybe. To better help please give the following info:

Output of redis-cli INFO
Output of redis-cli CONFIG GET '*'

	<!--
	<form autocomplete="off"> will turn off autocomplete for the form in most browsers
	except for username/email/password fields
	-->
	<form autocomplete="off">

	<!-- fake fields are a workaround for chrome/opera autofill getting the wrong fields -->
	<input id="username" style="display:none" type="text" name="fakeusernameremembered">
	<input id="password" style="display:none" type="password" name="fakepasswordremembered">

	use Mojolicious::Lite;

	# Catch magical detach exception and rethrow everything else
	hook around_dispatch => sub {
	my ($next, $c) = @_;
	return if eval { $next->(); 1 };
	die $@ unless $@ eq "MOJO_DETACH\n";
	};

	# Throw magical detach exception

	#!/opt/perl

	use Mojolicious::Lite;

	get '/' => sub {
	my $self = shift;

	die("Here") if $self->param("exception");

	$self->render("slash");

	#
	# Open 10k concurrent WebSocket connections with the client and server running
	# in the same process and perform 10k WebSocket message roundtrips
	#
	# Tested on OS X 10.9.2 (MacBook Air) with Perl 5.18.2 and EV 4.17 (kqueue)
	#
	# 560.9MB memory usage, 0% CPU usage once roundtrips are finished after 36s
	# (with all 20k sockets still open)
	#
	# Get the latest version of Mojolicious from http://github.com/kraih/mojo