rtomaszewski’s gists

rtomaszewski / cloud_api_limits.py

Created July 29, 2012 17:49

Be aware of the cloud API limitations when creating cloud servers

	# example code that creates cloud server and try not to hit the cloud API climits

	cs_count=13 # number of cs to build
	build_nr=1
	delayed_10s=False

	while build_nr <= cs_count :
	if 0==build_nr % 11 and not delayed_10s:
	time.sleep(60+10)

rtomaszewski / naive_cloud_api_limits.py

Created July 29, 2012 17:53

Naive API trying to create too many cloud server

	def cs_create(self, count, sample_nr):
	name='test' + str(int(time.time()))
	image=112
	flavor=1

	log("[%2d][%2d] creating image: " % (sample_nr, count) + pformat( {'name': name, 'image' : image, 'flavor' : flavor } ) )

	sm=self.cs.servers
	server=sm.create(name, image, flavor)

rtomaszewski / example_debug.py

Created July 29, 2012 19:41

Primitive logging functions in your python scripts that are buffered before will be printed on the stdout

	# Try to execute the script in two different modes to see the difference
	#
	# $ python log.py \| tee log
	# <noting for a long time>
	#
	# $ python -u log.py \| tee log
	# my log message 0
	#

	import time

rtomaszewski / gil_threads_test.py

Created July 31, 2012 20:39

An example of multithreaded python code that creates about 500 long running threads

	import threading
	import datetime
	import time
	from random import random

	class ThreadClass(threading.Thread):
	def set_id(self, id):
	self.id=id

	def dummy_delay(self):

rtomaszewski / object_variables_example.py

Created August 9, 2012 20:38

Differences between class and instance variables in Python

	class Test1InstanceVariable:
	mylist=[]

	def __init__(self, number):
	self.number= number

	def add(self, i):
	self.mylist.append(i)

	def show(self):

rtomaszewski / JavaExample.java

Created August 9, 2012 21:56

Simple java code showing that before we can assign value to variable it has to be known to the javac compiler in advance

	public class JavaExample {
	// with the next line commented the code is erroring out when we try to compile it
	//public int number;

	public JavaExample (int _number) {
	number=_number;
	}

	public void show() {
	System.out.println("[test " + number + "] list=%s");

rtomaszewski / ssh_example.py

Last active July 7, 2019 11:13

Example script written in python that executes remotely commands over ssh

	import paramiko

	ssh = paramiko.SSHClient()
	ssh.set_missing_host_key_policy( paramiko.AutoAddPolicy() )
	ssh.connect('5.79.4.10', username='root', password='7raW6nS6Krttest')

	stdin, stdout, stderr = ssh.exec_command('echo text on stdout stream; echo text on stderror stream 1>&2')

	print("reading outputs from the remote command")
	for l in stdout :

rtomaszewski / check_rackconnect.sh

Created August 13, 2012 21:47

An example bash script checking RackConnect deployment status

	#!/bin/bash

	iptables=$(iptables -nL)
	ret=no

	if echo $iptables \| grep -q 'Chain INPUT .policy DROP.' ; then
	if echo $iptables \| grep -q 'Chain FORWARD .policy DROP.' ; then
	if echo $iptables \| grep -q 'Chain OUTPUT .policy ACCEPT.' ; then
	if echo $iptables \| grep -q 'Chain RS-RackConnect-INBOUND' ; then
	ret=yes

rtomaszewski / example_paramiko_notty.py

Created August 19, 2012 19:05

example paramiko script that tries to run an interactive command that needs a terminal

	import paramiko

	bastion_ip='ip' # you have to edit and provide valid IP address
	bastion_pass='pass' # you have to edit it and provide valid password

	ssh = paramiko.SSHClient()
	ssh.set_missing_host_key_policy( paramiko.AutoAddPolicy() )
	ssh.connect(bastion_ip, username='root', password=bastion_pass)

	chan = ssh.invoke_shell()

rtomaszewski / example_paramiko_with_tty.py

Created August 19, 2012 19:49

example paramiko script with interactive terminal

	import paramiko
	import time
	import re

	bastion_ip='ip'
	bastion_pass='pass'

	ssh = paramiko.SSHClient()
	ssh.set_missing_host_key_policy( paramiko.AutoAddPolicy() )
	ssh.connect(bastion_ip, username='root', password=bastion_pass)

Radoslaw Tomaszewski rtomaszewski