alces’s gists

alces / terraform_existing_instances.py

Created November 24, 2017 11:55

return a list of google compute instances existing before a current run of terraform

	import json

	data = json.load(open('terraform.tfstate'))
	all_res = [mod['resources'].values() for mod in data['modules']]
	res_list = reduce(lambda x, y: x + y, all_res)

	disk_attrs = [r['primary']['attributes'] for r in res_list if r['type'] == 'google_compute_disk']
	print [a['users.0'].split('/')[-1] for a in disk_attrs if 'users.0' in a]

alces / build.gradle

Created July 17, 2017 12:19

Download dependencies into current directory and remove versions from filenames

	apply plugin: 'java'
	defaultTasks 'download'

	dependencies {
	runtime 'org.yaml:snakeyaml:1.18', 'org.mongodb:mongo-java-driver:3.4.2'
	}

	repositories {
	mavenCentral()
	}

alces / ansible_install_centos7.sh

Created July 7, 2017 08:11

Install the lates Ansible on CentOS 7

	yum install -y gcc python-devel openssl-devel epel-release
	yum install -y python-pip
	pip install ansible

alces / mvn_unique_version.md

Created July 7, 2017 06:11

How to set unique version for each build in Maven

Put in pom.xml a variable version:

<version>${my.artifact.version}</version>

And set this variable in mvn command line:

mvn -Dmy.artifact.version=1.0-$(date +%Y%m%d%H%M%S) deploy

alces / nip_io.md

Created June 30, 2017 05:30

Pseudo domain names for non-routable IP addresses

10.0.0.1.nip.io maps to 10.0.0.1
app.10.0.0.1.nip.io maps to 10.0.0.1
customer1.app.10.0.0.1.nip.io maps to 10.0.0.1
customer2.app.10.0.0.1.nip.io maps to 10.0.0.1
otherapp.10.0.0.1.nip.io maps to 10.0.0.1

alces / mvn_download.sh

Created June 22, 2017 08:36

Download an artifact from a Maven repository (such as Maven Central) into a local directory

mvn dependency:copy -Dartifact=org.yaml:snakeyaml:1.18 -DoutputDirectory=. -Dmdep.stripVersion=true

alces / scheduleDownstreamRun.groovy

Last active June 14, 2017 09:07

Schedule a build of a Jenkins job and print its URL after its start.

	import hudson.model.*
	// in order to pass environment variables into build, EnvInjectPlugin should be installed
	import org.jenkinsci.plugins.envinject.EnvInjectPluginAction

	println Hudson.instance.getItem('down_stream_job_name').scheduleBuild2(
	5, // quiet period
	new ParametersAction( // build parameters
	new StringParameterValue('STR_PARAM', 'Its value'), // string parameter
	new BooleanParameterValue('BOOL_PARAM', true) // boolean parameter
	),

alces / obscure_string.yml

Created May 30, 2017 10:45

Genereta an idempotent, pretty obscure string (can be used as a database password, etc.)

	- connection: local
	hosts: localhost
	tasks:
	- debug:
	msg: "{{ ('secretword' \| password_hash('sha256', 'salt_string')).split('$')[-1][:16] }}"

alces / add_user_to_mongo.js

Last active May 30, 2017 09:27

Add user to MongoDB (if no admin user exists, first create it)

	var ADMIN_USER = 'root';
	var ADMIN_PASS = 'ass4' + ADMIN_USER
	var NEW_USER = 'dummy';
	var TARGET_DB = 'mydb';

	var conn = new Mongo();
	var admDb = conn.getDB('admin');
	try {
	admDb.createUser({user: ADMIN_USER,
	pwd: ADMIN_PASS,

alces / eve_token.py

Created May 30, 2017 06:41

Eve server with token authentication

	#!/usr/bin/env python
	# to connect it using curl:
	# curl -H 'Authorization: Token 9d003d9a-2288-46b8-bfeb-7cec1eb53074' http://my.host.name/api/my_collection/

	import eve

	class MyTokenAuth(eve.auth.TokenAuth):
	def check_auth(self, token, allowed_roles, resource, method):
	return token == '9d003d9a-2288-46b8-bfeb-7cec1eb53074'

Alexey Zalesny alces