itxx00 itxx00

self signed ssl certificates

When setting up a development server that will be accessible over the internet, it is a good idea to use ssl.

Below are some snippets for setting up self signed certificates:

sudo openssl req -x509 -nodes -days 365 \
                 -newkey rsa:2048 \
 -keyout /etc/nginx/ssl/nginx.key \

#Ambari API - Run all Service Checks In order to check the status and stability of your cluster it makes sense to run the service checks that are included in Ambari. Usually each Ambari Service provides its own service check, but their might be services that wont include any service check at all. To run a service check you have to select the service (e.g. HDFS) in Ambari and click "Run Service Check" in the "Actions" dropdown menu.

Service Checks can be started via the Ambari API and it is also possible to start all available service checks with a single API command. To bulk run these checks it is necessary to use the same API/method that is used to trigger a rolling restart of Datanodes (request_schedules). The "request_schedules" API starts all defined commands in the specified order, its even possible to specify a pause between the commands.

Available Service Checks:

Service Name	service_name	Command
HDFS	HDFS	HDFS_SERVICE_CHECK

	#! /usr/bin/env python
	# -- coding: utf-8 --

	import time, os, socket
	import json

	metric = ['usr', 'nice', 'sys', 'idle', 'iowait', 'irq', 'soft', 'steal', 'guest']
	host = socket.gethostname()

	def get_cpu_core_stat(num):

	/*
	* Licensed to the Apache Software Foundation (ASF) under one or more
	* contributor license agreements. See the NOTICE file distributed with
	* this work for additional information regarding copyright ownership.
	* The ASF licenses this file to You under the Apache License, Version 2.0
	* (the "License"); you may not use this file except in compliance with
	* the License. You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*

	"""
	Server to answer requests from Libvirt VMs to http://169.254.169.254/
	Cloud images usually don't have a preset user/password, and this is needed to add a ssh pub key to .ssh/authorized_hosts.
	Change SSH_PUB_KEY path below.

	pip install bottle

	sudo ip address add 169.254.169.254 dev virbr0
	open firewall
	-A ufw-user-input -s 192.168.122.0/24 -d 169.254.169.254/32 -i virbr0 -p tcp -m tcp --dport 80 -j ACCEPT