Andrews Medina andrewsmedina

tmux cheat sheet

(C-x means ctrl+x, M-x means alt+x)

Prefix key

The default prefix is C-b. If you (or your muscle memory) prefer C-a, you need to add this to ~/.tmux.conf:

remap prefix to Control + a

A few show tricks to find slow queries in mongodb

Enable profiling

First, you have to enable profiling

> db.setProfilingLevel(1)

Now let it run for a while. It collects the slow queries ( > 100ms) into a capped collections, so queries go in and if it's full, old queries go out, so don't be surprised that it's a moving target...

Simple ambassador container

The Simple Ambassador Container (let's just call it the ambassador) is a reusable container which can be added to your stack to represent a remote service. Using an ambassador your application can discover remote services using docker's standard links features.

Usage

Example usage:

REDIS_REMOTE_IP=1.2.3.4

	-- show running queries (pre 9.2)
	SELECT procpid, age(clock_timestamp(), query_start), usename, current_query
	FROM pg_stat_activity
	WHERE current_query != '<IDLE>' AND current_query NOT ILIKE '%pg_stat_activity%'
	ORDER BY query_start desc;

	-- show running queries (9.2)
	SELECT pid, age(clock_timestamp(), query_start), usename, query
	FROM pg_stat_activity
	WHERE query != '<IDLE>' AND query NOT ILIKE '%pg_stat_activity%'

	#!/usr/bin/env python

	import argparse
	import json
	import os
	import urllib2


	def get_envs(app_name):
	resp = request("/apps/{}/env".format(app_name))

	# Compiled source #
	###################
	*.com
	*.class
	*.dll
	*.exe
	*.o
	*.so

	# Packages #

	#!/usr/bin/env python

	import pymongo, redis, os

	REDIS_HOST = os.getenv('REDIS_HOST', 'localhost')
	REDIS_PORT = os.getenv('REDIS_PORT', 6379)
	MONGO_HOST = os.getenv('MONGODB_HOST', 'localhost')
	MONGO_PORT = os.getenv('MONGODB_PORT', 27017)

	mongo = pymongo.MongoClient(MONGO_HOST, MONGO_PORT)

	import redis, os

	HOST = os.getenv("HOST", "localhost")
	PORT = os.getenv("PORT", 6379)

	r = redis.StrictRedis(host=HOST, port=PORT)
	cnames_app = r.get("cname*")

	for cname_app in cnames_app:
	cname = r.get(cname_app)

	db.currentOp().inprog.forEach(
	function(op) {
	if(op.secs_running > 5) printjson(op);
	}
	)

	#!/bin/bash

	PREFIX=registry.cloud.tsuru.io/tsuru/

	read command
	for image in "$@"
	do
	echo "Generating $image... "
	full_image=${PREFIX}${image}
	id=`docker -H 127.0.0.1:4243 run -d $full_image $command`