国内从 Docker Hub 拉取镜像有时会遇到困难,此时可以配置镜像加速器。Docker 官方和国内很多云服务商都提供了国内加速器服务。
Dockerized 实践 https://github.com/y0ngb1n/dockerized
Ubuntu 16.04+、Debian 8+、CentOS 7+
国内从 Docker Hub 拉取镜像有时会遇到困难,此时可以配置镜像加速器。Docker 官方和国内很多云服务商都提供了国内加速器服务。
Dockerized 实践 https://github.com/y0ngb1n/dockerized
Ubuntu 16.04+、Debian 8+、CentOS 7+
import asyncio | |
from asyncio.queues import Queue | |
TERMINATOR = object() | |
class TaskPool(object): | |
def __init__(self, loop, num_workers): | |
self.loop = loop | |
self.tasks = Queue(loop=self.loop) |
This document is research for the selection of a communication platform for robot-net.
The purpose of this component is to enable rapid, reliable, and elegant communication between the various nodes of the network, including controllers, sensors, and actuators (robot drivers). It will act as the core of robot-net to create a standardized infrastructure for robot control.
Requirements:
Magic words:
psql -U postgres
Some interesting flags (to see all, use -h
or --help
depending on your psql version):
-E
: will describe the underlaying queries of the \
commands (cool for learning!)-l
: psql will list all databases and then exit (useful if the user you connect with doesn't has a default database, like at AWS RDS)For this configuration you can use web server you like, i decided, because i work mostly with it to use nginx.
Generally, properly configured nginx can handle up to 400K to 500K requests per second (clustered), most what i saw is 50K to 80K (non-clustered) requests per second and 30% CPU load, course, this was 2 x Intel Xeon
with HyperThreading enabled, but it can work without problem on slower machines.
You must understand that this config is used in testing environment and not in production so you will need to find a way to implement most of those features best possible for your servers.
var Promise = require('bluebird'); | |
var promiseWhile = function(condition, action) { | |
var resolver = Promise.defer(); | |
var loop = function() { | |
if (!condition()) return resolver.resolve(); | |
return Promise.cast(action()) | |
.then(loop) | |
.catch(resolver.reject); |
/* | |
In the node.js intro tutorial (http://nodejs.org/), they show a basic tcp | |
server, but for some reason omit a client connecting to it. I added an | |
example at the bottom. | |
Save the following server in example.js: | |
*/ | |
var net = require('net'); |
Each of these commands will run an ad hoc http static server in your current (or specified) directory, available at http://localhost:8000. Use this power wisely.
$ python -m SimpleHTTPServer 8000
// Load the TCP Library | |
net = require('net'); | |
// Keep track of the chat clients | |
var clients = []; | |
// Start a TCP Server | |
net.createServer(function (socket) { | |
// Identify this client |