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CODE FARM

2 - Kubernetes Pods

04 Mar 2019

What is a Pod? Pods are the smallest deployable units of computing that can be created and managed in Kubernetes. A pod (as in a pod of whales or pea pod) is a group of one or more containers (such as Docker containers), with shared storage/network, and a specification for...
1 - Kubernetes Objects

22 Feb 2019

YAML Learn YAML in Y minutes: https://learnxinyminutes.com/docs/yaml/ YAML Multiline: https://yaml-multiline.info/ Online YAML Validator: http://www.yamllint.com/ YAML official website: https://yaml.org/ string, number, bool, null object/map, array/list YAML to JSON --- key: value another_key: Another value goes here. a_number_value: 100 boolean: true null_value: null literal_block: | This entire block of text will be...
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...
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...
Intro to .NET (Core)

07 Apr 2018

.NET .NET is a free, cross-platform, open source developer platform for building many different types of applications. With .NET, you can use multiple languages, editors, and libraries to build for web, mobile, desktop, gaming, and IoT. .NET Framework/.NET Core/Mono (Xamarin) C#/VB.NET/F# Assembly/DLL/MSIL Common Language Runtime (CLR) GC/JIT CoreCLR Base Class...
Introduction to Linux

06 Apr 2018

1. Multics/Unix Multics an influential early time-sharing operating system MIT, GE, Bell Labs Unix Ken Thompson The designer and implementer of the original Unix Since 2006, Thompson has worked at Google, where he co-invented the Go programming language. C and Unix Dennis Ritchie: the creator of the C programming language...

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