ninehills

- What do Etcd, Consul, and Zookeeper do?
  - Service Registration:
    - Host, port number, and sometimes authentication credentials, protocols, versions
      numbers, and/or environment details.
  - Service Discovery:
    - Ability for client application to query the central registry to learn of service location.
  - Consistent and durable general-purpose K/V store across distributed system.
    - Some solutions support this better than others.
    - Based on Paxos or some derivative (i.e. Raft) algorithm to quickly converge to a consistent state.
    - Centralized locking can be based on this K/V store.

ninehills

#!/usr/bin/env python
# a simple multi-threaded TCP Black Hole server
import sys
from socket import *
import threading
import thread
import time

def handler(clientsock,addr):
    try:

ninehills

set nocompatible
syntax enable
set encoding=utf-8
set showcmd                     " display incomplete commands
filetype plugin indent on       " load file type plugins + indentation

"" Whitespace
set nowrap                      " don't wrap lines
set tabstop=4 shiftwidth=4      " a tab is 4 spaces
set expandtab                   " use spaces, not tabs

ninehills

import os
import struct 
import socket

state_table = (
        "EMPTY SLOT",
        "ESTABLISHED",
        "SENT",
        "RECV",
        "WAIT1",

ninehills

import inspect
import logging
import re

# from https://github.com/baniuyao/Python-CLog/blob/master/CLog.py

class LogRecordWithStack(logging.LogRecord):
    def __init__(self, *args, **kargs):
        super(LogRecordWithStack, self).__init__(*args, **kargs)
        self.chain = self.get_meta_data()

ninehills

# http://snipperize.todayclose.com/snippet/py/64-%E5%92%8C-10%E8%BF%9B%E5%88%B6--93237/


def encode_b64(n):
    table = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ-_'
    result = []
    temp = n
    if 0 == temp:
    ¦   result.append('0')
    else:

ninehills

DevOps

• 监控 "信息采集，日志处理，报警"
  • Zabbix "http://www.zabbix.com/product.php"
  • heka #go "https://github.com/mozilla-services/heka"
  • 日志处理
• sentry #python 异常采集和聚合

ninehills

package main

import "fmt"

// fibonacci 函数会返回一个返回 int 的函数。
func fibonacci() func() int {
	sum1 := -1
	sum2 := 1
	return func() int {
		sum := sum1 + sum2

ninehills

set -eu
getent passwd | grep "^${1}:" | head -1 >> /etc/passwd
cp -r /etc/skel /home/$1
chown -R $1 /home/$1
usermod -d /home/$1 $1

ninehills

#!/usr/bin/env python
"""A fake smtp server, use system sendmail to send the mail. (need Python > 2.4)"""

import smtpd
import asyncore
from subprocess import Popen, PIPE

class FakeSMTPServer(smtpd.SMTPServer):
    """A Fake smtp server"""