babatundebusari

Resize a Hard Disk for a Virtual Machine

Our Virtual Machines are provisioned using Vagrant from a Linux base box to run using VirutalBox. If the Hard Disk space runs out and you cannot remove files to free-up space, you can resize the Hard Disk using some VirtualBox and Linux commands.

Some assumptions

The following steps assume you've got a set-up like mine, where:

Nginx FastCGI cache

Example /etc/nginx/nginx.conf using FastCGI (e.g. to PHP-FPM) with FastCGI cache enabled. This will capture returned data and persist it to a disk based cache store for a configurable amount of time, great for robust full page caching.

Will need to create a directory to hold cache files, for the example given here that would be:

$ sudo mkdir -p /var/cache/nginxfastcgi
$ chown www-data: /var/cache/nginxfastcgi

Python for System Admins / Operators

Installing Python

Most Unix/Linux systems come with python pre-installed:

$ python -V

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.

	#
	# Customized VCL file for serving up a Drupal site with multiple back-ends.
	#
	# Based on this excellent Lullabot article:
	# http://www.lullabot.com/articles/varnish-multiple-web-servers-drupal
	#

	# Hooks for New Relic
	C{
	#include <sys/time.h>

	# get it
	docker pull mongo

	# startup a 3 node replica set
	docker run --name mongo-rs-1 -d mongo --nojournal --oplogSize 10 --replSet rs
	docker run --name mongo-rs-2 -d mongo --nojournal --oplogSize 10 --replSet rs
	docker run --name mongo-rs-3 -d mongo --nojournal --oplogSize 10 --replSet rs

	# connect to first node
	docker run -it --link mongo-rs-1:mongo1 --link mongo-rs-2:mongo2 --link mongo-rs-3:mongo3 --rm mongo /bin/bash

	# Hello, and welcome to makefile basics.
	#
	# You will learn why `make` is so great, and why, despite its "weird" syntax,
	# it is actually a highly expressive, efficient, and powerful way to build
	# programs.
	#
	# Once you're done here, go to
	# http://www.gnu.org/software/make/manual/make.html
	# to learn SOOOO much more.

	#! /bin/sh
	# /etc/init.d/kafka: start the kafka daemon.

	# chkconfig: - 80 20
	# description: kafka

	KAFKA_HOME=/usr/share/kafka
	KAFKA_USER=root
	KAFKA_SCRIPT=$KAFKA_HOME/bin/kafka-server-start.sh
	KAFKA_CONFIG=$KAFKA_HOME/config/server.properties

	# /opt/zookeeper/conf/java.env

	ZOO_LOG4J_PROP="INFO,ROLLINGFILE"
	ZOO_LOG_DIR="/var/log/zookeeper/"

	function drips(){
	docker ps -q \| xargs -n 1 docker inspect --format '{{ .NetworkSettings.IPAddress }} {{ .Name }}' \| sed 's/ \// /'
	}