Anton Egorov satyrius

Connect to a Google Cloud Compute Engine using Mosh (mobile shell)

Mosh is a great way to overcome lag and flakey connection issues when accessing remote terminals over SSH: https://mosh.org/

Unfortunately, there's still not a lot of clear documentation for "idiots" because a lot of the existing guides assume a) "it just works", or b) you're already skilled enough to set everything up from scratch (assumed knowledge/use cases).

One of the problems I ran into for quite a long time yesterday was getting the darn thing to connect to my Google Cloud instance. I kept running into the mosh: Nothing received from server on UDP port 60001. [To quit: Ctrl-^ .] error (by the way - to quit, you have to press . after Ctrl-^ - it's not just Ctrl-^, there is a dot there too!)

FAQs and the like made vague spartan references to NATs, firewalls, iptables and the like and I tried out various commands and configurations on the se

Working with ansible-vault

I've been using a lot of Ansible lately and while almost everything has been great, finding a clean way to implement ansible-vault wasn't immediately apparent.

What I decided on was the following: put your secret information into a vars file, reference that vars file from your task, and encrypt the whole vars file using ansible-vault encrypt.

Let's use an example: You're writing an Ansible role and want to encrypt the spoiler for the movie Aliens.

WARNING: If you're reading this in 2021 or later, you're likely better served by reading:

(This gist was created in 2013 and targeted the legacy GOPATH mode.)

$ ssh -A vm
$ git config --global url."[email protected]:".insteadOf "https://github.com/"

tmux shortcuts & cheatsheet

start new:

tmux

start new with session name:

tmux new -s myname

	ssh-keygen -t rsa -b 4096 -m PEM -f jwtRS256.key
	# Don't add passphrase
	openssl rsa -in jwtRS256.key -pubout -outform PEM -out jwtRS256.key.pub
	cat jwtRS256.key
	cat jwtRS256.key.pub

	// #!Swift-1.1
	import Foundation


	// MARK: - (1) classes

	// Solution 1:
	// - Use classes instead of struct
	// Issue: Violate the concept of moving model to the value layer
	// http://realm.io/news/andy-matuschak-controlling-complexity/

	source: http://www.markbrilman.nl/2011/08/howto-convert-a-pfx-to-a-seperate-key-crt-file/

	`openssl pkcs12 -in [yourfile.pfx] -nocerts -out [keyfile-encrypted.key]`

	What this command does is extract the private key from the .pfx file. Once entered you need to type in the importpassword of the .pfx file. This is the password that you used to protect your keypair when you created your .pfx file. If you cannot remember it anymore you can just throw your .pfx file away, cause you won’t be able to import it again, anywhere!. Once you entered the import password OpenSSL requests you to type in another password, twice!. This new password will protect your .key file.

	Now let’s extract the certificate:

	`openssl pkcs12 -in [yourfile.pfx] -clcerts -nokeys -out [certificate.crt]`

	from django.contrib import admin


	class ReadOnlyModelAdmin(admin.ModelAdmin):
	"""
	ModelAdmin class that prevents modifications through the admin.

	The changelist and the detail view work, but a 403 is returned
	if one actually tries to edit an object.

	# Some good references are:
	# http://russbrooks.com/2010/11/25/install-postgresql-9-on-os-x
	# http://www.paolocorti.net/2008/01/30/installing-postgis-on-ubuntu/
	# http://postgis.refractions.net/documentation/manual-1.5/ch02.html#id2630392

	#1. Install PostgreSQL postgis and postgres

	brew install postgis
	initdb /usr/local/var/postgres
	pg_ctl -D /usr/local/var/postgres -l /usr/local/var/postgres/server.log start

	#!/usr/bin/env python

	#
	# Converts any integer into a base [BASE] number. I have chosen 62
	# as it is meant to represent the integers using all the alphanumeric
	# characters, [no special characters] = {0..9}, {A..Z}, {a..z}
	#
	# I plan on using this to shorten the representation of possibly long ids,
	# a la url shortenters
	#