# 徐欣業專題第一週筆記(2022/09/22~2022/09/29) [![hackmd-github-sync-badge](https://hackmd.io/kQSkhJocRDutmKHitnSdhA/badge)](https://hackmd.io/kQSkhJocRDutmKHitnSdhA) [TOC] - [x] VM(Virtual Machine) - [x] github - [x] docker - [x] heroku - [x] NGRoK - [x] linode - [x] DB ### Virtual Machine(VM)虛擬機器 - What is VM? - a software computer used as emulation of an actual physical computer - can run multi-tenant on on physical computer - ![](https://i.imgur.com/fDHwvgH.png) - VM - hypervisor - VMware vSphere - Microsoft Hyper-V - OS(operating system) - Ubuntu - Linux system - open source - VirtualBox - work on Windows, Linux - Virtual Machine compare to Physical Servers - stable - easy to find the problem - VMs are independ to each other, so that if one of the VM get destroy. - problem can be remove easier than physical computer - build a new VM and restore the entire VM at a DR site - easy to manage - recovery process can be very fast, because we don't need to restore the physical computer. - can Customize system size - cheaper - because most of the physical system have a lot of resource isn't use, VM can take care of the underutilized system. - not easy to control.? - need profassional skill to control. - easy to remove server data to different server. - physical server environment need move to another location,is more difficult. - need to build up the same environment step by step as the original one. - reference - [Physical Servers vs. Virtual Machines: Key Differences and Similarities ](https://www.nakivo.com/blog/physical-servers-vs-virtual-machines-key-differences-similarities/) - [Virtual Machine | 虛擬機器](https://www.gigabyte.com/tw/Glossary/virtual-machine) ### GitHub & Git - Distributed Version Control System(分散式版本控制系統) - repository(資料庫) - History - can tell the user when the code get change, and what change between two code. - can check all the document(code, picture,...) - can change what you want to public immediately - can storage multi-version's project in one list. - multi-person collaboration - provide Cloud storage save our project - compare to centralized Version Control System(集中式版本控制) - diversify risk, everybody have there own code in there own device ![](https://i.imgur.com/44661gL.png) ![](https://i.imgur.com/wRSkOGt.png) - how to use - Create a new repository - set owner name - Repository name - Description - reference - [Git和Github簡介](https://www.leunghoyin.hk/git-github-intro) - [A list of commonly used Git commands](https://github.com/joshnh/Git-Commands) - [Git Bash 基本操作](http://yhhuang1966.blogspot.com/2020/01/git-git-bash.html) - [git/.COMMIT_EDITMSG.swp](https://www.itdaan.com/tw/81e9e8f6ca1f8cbe318fb984bab7d6a4) - [git commit 时出现：please enter the commit message for your changes](https://zhuanlan.zhihu.com/p/133331582) - [Git-解讀git status的訊息，了解工作資料夾的版控狀態](https://ithelp.ithome.com.tw/articles/10211789) - [Git – GitHub 出現](http://jsnwork.kiiuo.com/archives/3147/git-github-%E5%87%BA%E7%8F%BE-%E3%80%8Cplease-make-sure-you-have-the-correct-access-rights-and-the-repository-exists-%E3%80%8D/) - [error: src refspec xxx does not match](https://blog.csdn.net/u014361280/article/details/109703556) ### Docker - software platfrom - Build, test, and deploy applications quickly - packages software into standardlized units called containers - let user easy to transplant to other deivice - provide flexable cloud sevice - How it work - Docker container - Dockerfile - A order that contain how to build the Docker image - ![](https://i.imgur.com/tsbdyJR.png) - Docker image - Docker container's blueprint - Contain Docker file and code, code version - Docker ignore: will not be upload - ![](https://i.imgur.com/17wGjYb.png) - Docker vs VM - ![](https://i.imgur.com/kkApV76.png) - Docker - Take up less resources - High resource utilization - Share resource - run fast - VM - when user develop in different OS or version, VM need to install all the OS and version - waste a lot of time - OS operating needs lots of time and complexity - Refernce - [什麼是 Docker](https://aws.amazon.com/tw/docker/) - [Docker vs VM](https://geekflare.com/docker-vs-virtual-machine/) - [Docker download](https://docs.docker.com/desktop/install/windows-install/) ### Database(DB) - organized collection of structured information, or data, typically stored electronically in a computer system, usually control by database management system(DBMS). - data can then be easily accessed, managed, modified, updated, controlled, and organized. - structured query language(SQL) - SQL is a programming language used by nearly all relational databases to query, manipulate, and define data, and to provide access control. - Reference - [What is a Database](https://www.oracle.com/database/what-is-database/#:~:text=A%20database%20is%20an%20organized,database%20management%20system%20(DBMS).) ### Linode - Virtual Private Server(VPS) - uses virtualization software to partition physical servers into multiple virtual servers each having the ability to run its own Operating System (OS) and applications. - Kernel-based Virtual Machine (KVM) - let user easy to use one device to switch and control multi-devices. - save space and cost savings... - provide different Linux system for user - ex. Alpine、Arch Linux、Centos、Debian、Fedora、Gentoo、Slackware、Ubuntu、openSUSE - didn't provide windows, need to prepare for itself. - refernce - [KVM](https://www.aten.com/tw/zh/reasources/feature-articles/what-is-a-kvm-switch/) - [VPS](https://fullforms.com/VPS#:~:text=What%20does%20VPS%20mean%3F,System%20(OS)%20and%20applications.) - [Linode](https://www.kjnotes.com/other/106) ## LineBot ### heroku - PaaS(platform as a service) - online computing services - provide platform-based service - User don't need to manage and control online platform-based - User only need take care of app. - a platform that allow user to public online - heroku have provide Dyno to let the user run faster - Dyno: virtual machine, - need $$$ - AWS(Amazon Web Services) ### ngrok - Reverse Proxy(反向代理伺服器) - Used as a proxy on the server side - Clients only knows proxy's IP - Clients can use reverse server to access resources on different back-end servers - public localhost server ![Reverse Proxy](https://i.imgur.com/vqEXIrc.png) ![](https://i.imgur.com/pCYyw40.png) ![](https://i.imgur.com/hi3DATo.png) - refernce - [Heroku vs ngrok](https://stackshare.io/stackups/heroku-vs-ngrok) - [NGROK](https://www.newton.com.tw/wiki/ngrok/13986278) - [反向代理](https://zh.wikipedia.org/zh-tw/%E5%8F%8D%E5%90%91%E4%BB%A3%E7%90%86) - [ngrok 不求人：自己搭一個窮人版的 ngrok 服務](https://5xruby.tw/posts/easy-ngrok-by-nginx-ssh-tunnel) - [不做怎麼知道系列](https://ithelp.ithome.com.tw/articles/10230149)