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CODE FARM

0 - Kubernetes Overview

21 Feb 2019

What is Kubernetes? Kubernetes is a production-grade, open-source platform that orchestrates the placement (scheduling) and execution of application containers within and across computer clusters. Kubernetes provides a container-centric management environment. It orchestrates computing, networking, and storage infrastructure on behalf of user workloads. https://kubernetes.io/docs/concepts/overview/what-is-kubernetes/ Kubernetes vs Docker Swarm vs Apache Mesos...
Access Kubernetes API with Client Certificates

01 Feb 2019

Controlling Access to the Kubernetes API Users access the API using kubectl, client libraries, or by making REST requests. Both human users and Kubernetes serevice accounts can be authorized for API access. When a request reaches the API, it goes through several stages, illustrated in the following diagram: For more...
Cryptography and Public Key Infrastructure

31 Jan 2019

1. Cryptography Cryptography is used to protect information and communications. This is typically done by using cryptographic techniques to scramble plaintext (ordinary text) into ciphertext (encoded text) and back again. This scrambling process is called encryption. The reverse process is called decryption. Cryptography is concerned with the following objectives: Confidentiality:...
Install Kubernetes using kubeadm

28 Jan 2019

Using kubeadm,a minimum viable Kubernetes cluster can be created that conforms to best practices. In fact, kubeadm can be used to set up a cluster that will pass the Kubernetes Conformance tests. kubeadm also supports other cluster lifecycle functions, such as bootstrap tokens and cluster upgrades. [1] Figure 1. Kubernetes...
Tcpdump Examples

29 Dec 2018

1. Basics 1.1. BASIC COMMUNICATION Just see what’s going on, by looking at all interfaces. tcpdump -i any 1.2. PRINT THE LIST OF THE NETWORK INTERFACES Print the list of the network interfaces available on the system and on which tcpdump can capture packets. tcpdump --list-interfaces 1.3. SPECIFIC INTERFACE Basic...
Intall Minikube with kubeadm on Debian 9

27 Dec 2018

1. Install minikube binary with curl curl -Lo minikube https://github.com/kubernetes/minikube/releases/download/v0.32.0/minikube-linux-amd64 && chmod +x minikube && sudo cp minikube /usr/local/bin/ && rm minikube Use the following command to enable bash completion for kubernetes with kubectl: sudo apt-get install bash-completion && sudo sh -c 'minikube completion bash > /etc/bash_completion.d/minikube.bash' && source /etc/bash_completion.d/minikube.bash...
Python Notes 04 NUMERICS

04 Sep 2018

􀁺 数的简介 􀁺 整型 􀁺 布尔型 􀁺 标准的整型 􀁺 长整型 􀁺 浮点型实数 􀁺 复数 􀁺 操作符 􀁺 内建函数 􀁺 其它数字类型 􀁺 相关模块 5.1 数字类型数字提供了标量贮存和直接访问。它是不可更改类型，也就是说变更数字的值会生成新的对象。 Python 支持多种数字类型：整型、长整型、布尔型、双精度浮点型、十进制浮点型和复数。如何创建数值对象并用其赋值 (数字对象) : 创建数值对象和给变量赋值一样同样简单 anInt = 1 aLong = -9999999999999999L aFloat = 3.1415926535897932384626433832795 aComplex = 1.23+4.56J 如何更新数字对象通过给数字对象（重新）赋值，您可以“更新”一个数值对象。数值对象是不可改变对象，实际上你并没有更新该对象的原始数值，而是生成了一个新的数值对象，并得到它的引用。如何删除数字对象按照Python...
Python Notes 04 OBJECTS

04 Sep 2018

􀁺 Python 对象 􀁺 内建类型 􀁺 标准类型运算符 􀁺 值的比较 􀁺 对象身份比较 􀁺 布尔类型 􀁺 标准类型内建函数 􀁺 标准类型总览 􀁺 各种类型 􀁺 不支持的类型 4.1 Python 对象 Python 使用对象模型来存储数据。构造任何类型的值都是一个对象。尽管Python 通常当成一种“面向对象的编程语言”，但你完全能够写出不使用任何类和实例的实用脚本。不过Python 的对象语法和架构鼓励我们使用这些特性，下面让我们仔细研究一下Python 对象。所有的Python 对像都拥有三个特性：身份，类型和值。身份每一个对象都有一个唯一的身份标识自己，任何对象的身份可以使用内建函数id()来得到。这个值可以被认为是该对象的内存地址。您极少会用到这个值，也不用太关心它究竟是什么。类型对象的类型决定了该对象可以保存什么类型的值，可以进行什么样的操作，以及遵循什么样的规则。您可以用内建函数type()查看Python 对象的类型。因为在Python 中类型也是对象（还记得我们提到Python 是面向对象的这句话吗?)，所以type()返回的是对象而不是简单的字符串。值对象表示的数据项上面三个特性在对象创建的时候就被赋值，除了值之外，其它两个特性都是只读的。如果对象支持更新操作，那么它的值就可以改变，否则它的值也是只读的。对象的值是否可以更改被称为对象的可改变性（mutability）....
Python Notes 03 BASICS

04 Sep 2018

􀁺 语句和语法 􀁺 变量赋值 􀁺 标识符和关键字 􀁺 基本风格指南 􀁺 内存管理 􀁺 第一个 Python 程序 3.1语句和语法 Python 语句中有一些基本规则和特殊字符： 􀁺 井号(#)表示之后的字符为 Python 注释 􀁺 换行 (\n) 是标准的行分隔符（通常一个语句一行） 􀁺 反斜线 ( \ ) 继续上一行 􀁺 分号 ( ; )将两个语句连接在一行中 􀁺 冒号 ( : ) 将代码块的头和体分开 􀁺 语句（代码块）用缩进块的方式体现 (缩进四个空格宽度，避免使用制表符) 􀁺 不同的缩进深度分隔不同的代码块 􀁺 Python 文件以模块的形式组织...
Python Notes 02 GETTING STARTED

04 Sep 2018

􀁺 介绍 􀁺 输入/输出 􀁺 注释 􀁺 操作符 􀁺 变量与赋值 􀁺 Python 类型 􀁺 缩进 􀁺 循环与条件 􀁺 文件 􀁺 错误 􀁺 函数 􀁺 类 􀁺 模块 2.3 注释普通注释和大部分脚本及Unix-shell 语言一样，Python 也使用 # 符号标示注释，从 # 开始，直到一行结束的内容都是注释。 >>> # one comment ... print 'Hello World!' # another comment Hello World!...
Docker and Minikube behind HTTP Proxy

09 Aug 2018

1. Setup HTTP Proxy Environment Variables Linux and Unix-like systems has environment variable called http_proxy, https_proxy and no_proxy. It allows you to connect text based session and/or applications via the proxy server. All you need is proxy server IP address (URL) and port values. The variable is almost used by...
Docker Logging with EFK Stack

29 Jun 2018

For the cluster-wide logging solution on Kubernetes, see post at Kubernetes Logging 1. What is the ELK/EFK Stack? ELK is the arconym for three open source projects: Elasticsearch, Logstash, and Kibana. Elasticsearch is a search and analytics engine. Logstash is a server-side data processing pipeline that ingests data from multiple...
TCP/IP Protocol

19 May 2018

1. 局域网上运行 HTTP 的两台主机 2. TCP/IP 协议族中不同层次的协议 > What’s popular or common commands for the de-factor 5 network layers in Linux? * Sure, here’s a brief rundown of common Linux commands used for various tasks across the five layers (Application, Transport, Network, Data Link, and Physical) of the conceptual network...
Linux firewall, netfilter and iptables

20 Apr 2018

1. Concepts netfilter is a set of hooks inside the Linux kernel that allows kernel modules to register callback functions with the network stack. A registered callback function is then called back for every packet that traverses the respective hook within the network stack. iptables is a userspace command line...
GopherChina 2018

16 Apr 2018

1.1 基于Go构建滴滴核心业务平台的实践 # 服务治理异常定位日志格式混乱大量 adaptor 人工配置与分析处理性能低，资源消耗大服务串联困难上下游定位困难跨业务定位效率低缺乏服务调用拓扑关系链路难以分析日志孤立性能要素缺失链路优化全链路压测服务迁移接口一致性兼容/代理/切流(旁路引流/流量切换/线上观察) 日志规范化, 服务日志规范/通信接口规范/日志组件数据结构化 DLTAG Key/Value 请求串联 TraceId 链路可视化 SpanId 处理统一化, 处理系统/日志统一处理采集/计算/存储 # GC 对象数量过多，GC 三色算法耗费较多 CPU 减少对象分配？用值类型代替对象类型？多用栈，少用堆？Goroutine 拷贝栈扩展？ 1.2 Go在Grab地理服务中的实践 # Nearby Service Node.js + PostGIS R-Tree...
Partition, format and mount driver on Linux

09 Apr 2018

Disk partitioning Disk partioning or disk slicing is the creation of one or more regions on a hard disk or other secondary storage, so that an operating system can manage information in each region separately. Partioning is typically the fist step of preparing a newly manufactured disk, before any files...

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