working remotely (via ssh) rocks!

Working Remotely Rocks!(via SSH)

Kent Chen

Kent Chen (chenkaie)

chenkaie@gmail.com

http://chenkaie.blogspot.com

@chenkaie on GitHub

@chenkaie on SlideShare

@chenkaie on LinkedIn

@chenkaie on Twitter

@+KentChenAtGoogle on Google+

你是否曾經

幻想過以下畫面

Have you ever dreamed of a scene as the following…

© Flickr/veader

Working at Starbucks

© Flickr/willsteward

Working at Coffee Shop

© Flickr/kinetic

Working at the Beach

© Flickr/kinetic

Working at the Beach

© 37signals Works Remotely

Working at Your Sweet House

Working at White House

© Flickr/sharris

Working at Ur Favour Place

很不幸�並非談那類的

遠距辦工Unfortunately, NOT talking that type of

“Working Remotely”

We Work Remotely https://weworkremotely.com/

不願面對的

真相An Inconvenient TRUTH

© Flickr/kent-chen

Working at Airport - EVA Air Lounge

© Flickr/kent-chen

Working at Airport - EVA Air Lounge

俗稱:

放我一馬吧編

程

當然偶有小確幸的一面

Small happiness sometimes.

小弟的一些親身經驗

Personal remote development experience

© Flickr/kent-chen

Working at Tainan Coffee Shop

© Flickr/kent-chen

Working at Tainan Coffee Shop

俗稱:

咖啡因編程

© Flickr/kent-chen

Working with Bears & Wines

© Flickr/kent-chen

Working with Bears & Wines

俗稱:

微醺編程

遠距辦公の工作狂?

An Working Remotely Workaholic?

並非完全如此

Not exactly, some reasons…

臨時私事處理

Some urgent personal affairs

疲勞轟炸の會議

精神不繼Exhausted whole day long meeting

客戶工作時間配合

Meet customers’ work time

哥現在就是不想寫程式

I just don’t want to coding NOW

自我能力

精進Self Enhancement

在家寫程式我就是覺得

超爽der~~I feel so productive when coding at home

那個來來來...?!

Whatever…

身為一個

嵌入式系統軟韌體工程師

Being an Embedded System Engineer

我想身上帶塊

開發版也是合情合理的You need an EVM board /

Development Board on hand

所以...我得搞一塊開發版回家So… I have to bring an EVM

board home for dev

並且搞定完整的

開發環境And setup a whole development

environment including S/W & H/W

只是為了解某個鳥 bugFor fixing some a minor issue

或是接續

追到一半的問題

Or for tracing an on-going unfixed issue

.

..

...

那未免也太

搞肛了吧

That’s a bit too bothersome and time-consuming

容我介紹一下

可行作法A feasible approach sharing

若能無縫接軌回內網的

開發除錯環境What if we can resume last

develop/debugging session in the office

那就搞定

一半了That’s ALMOST done

內網通常無法由外部主機連進去

Intranet server generally cannot login from a client through internet

我指「通常」Orz

I mean “Generally”…

若是被駭了植入後門

(另當別論)

If been Hacked, plant a backdoor That’s another matter

常見方法

VPN虛擬私人網路

VPN is a common feasible solution if available

或者是簡易好用的

TeamViewer

TeamViewer is also feasible

你受得了龜速

TeamViewer

TeamViewer suffers high latency

=

你受得了龜速

TeamViewer

TeamViewer suffers high latency

=

天下武功無堅不破唯快不破

FAST - short network latency is a MUST for basic development env.

對程師設計師而言

「快」使用者體驗：贊

FAST: Great UX for programmer

建立反向 SSH Tunnel 可以幹許多有趣的壞事

Well-known Reverse SSH Tunnel

Basic Requirement !

• 24-Hours online SSH server: • DD-WRT Router / VPC (Amazon EC2) / NAS /

A development board / … • With Public Access IP:

• Fixed IP (Trivial) • Dynamic IP (DDNS)

• SSH Client: • Mac OS X / Linux Distributions (Prefer Unix-

based) • Windows (putty, plink)

• Not too poor upload/download network bandwidth

至於打通手法 Goolge it, BJ4Lots of tutorial, no explanation “Remote Port Forwarding” on 22

Ref: http://josephj.com/entry.php?id=312

我只能說: 建議搭配服用 “Autossh / expect”

& “SSH Public Key Authentication”

效果加乘

Employ with “autossh / expect” to get persistent connection

需要 Customer Support 請撥底下分機0800-092-000

If you need help, please call me

透過該暗黑魔法打通後

Once successfully setup a Reverse SSH Tunnel

Working remotely through

Reverse SSH Tunnel

Working remotely through

Reverse SSH Tunnel

Joker: You see dead people. Hey you, get the job done. Or…

強烈建議轉職為

CLI 職人Command-Line Interface

Strongly suggested to be addicted to CLI operation on all you development jobs

Me an embedded system developer daily using CLI utilities !

• Editor: vim • VCS/SCM: git / svn • Diff/Merge: vimdiff / DirDiff (vim) • Terminal Multiplexer: tmux • File search: find / godir() • pattern matching: grep / aj / gid (ID Utils)

Ref: Vim Rocks! http://www.slideshare.net/chenkaie/vim-rocks TMUX Rocks! http://www.slideshare.net/chenkaie/tmux-rocks

CLI 職人(魔人)遠距開發

益處多多An amazing lot of advantages

if you dev remotely with pure CLI

!

優點一�

Pros 1

頻寬需求低反應速度快

Lower bandwidth demand Instant keystroke response

!

優點二�

Pros 2

「終端复用器 tmux」+

「命令列魔人 CLI」

With the assistance of terminal multiplexer: tmux & CLI

任意地點、任意終端

一致性不間斷完整開發環境

Consistent & Persistent development environment from any location any client

!

優點三�

Pros 3

容易建置、部署一致性開發環境

Consistency dev environment easily setup on different machines even different platforms

Ref: https://github.com/chenkaie/manifest-unix-env-deploy

有時候會需要存取

內網服務Sometimes you have demands to access other intranet service

那就建立 SOCKS v4/v5 Proxy Server

Use “ssh -D” to setup SOCKS ServerRef: http://josephj.com/entry.php?id=312

Redmine Wiki

Bugzilla WebMail

Private IP Host Private IP Device

Don’t worry, all are easily accessible

Chrome 請搭配 “Proxy SwitchySharp”

Firefox 請搭配 “FoxyProxy”

讓你無痛又無縫切換 Proxy

Use browser plugin/extension to seamlessly switch between different proxy

Chrome + SwitchySharp (Auto Switch Mode: Domain)

Chrome + SwitchySharp (Auto Switch Mode: IP Address)

有人提問:啊…那個純CLI下

Streaming 怎麼連勒

How to connect rtsp streaming under CLI mode

RTSP streaming connection via CLI: avconv

avconv (ffmpeg): $ avconv -rtsp_transport tcp -i "rtsp://root@172.16.81.61/live.sdp" -vcodec copy ~/tmp/test.mp4

RTSP streaming connection via CLI: avplayavplay (ffplay): $ avplay -rtsp_transport tcp -i "rtsp://root@172.16.81.61/live.sdp"

又有人說:嵌入式系統開發沒 Console 可用說得過嗎(翻桌)

Embedded System development w/o Console?!

$ cat /proc/kmsg (a poor solution)

路人甲說:沒有 IW2 可用

怎麼找 IP Camera 勒

How to search a IP Cam without IW2

請愛用強大的

”IW2 Air”

Awesome “IW2 Air” just works

最後有人忍不住說:哥就是要視窗操作啦 Desktop / X-Window

I just want to use GUI desktop environment

好懷念菸酒生時期透過

Windows遠端桌面連回LAB的低延遲速度感

Low latency remote control experience on “Microsoft Remote Desktop”

往事只能回味真的回不去了嗎?

“Microsoft Remote Desktop” No longer available under NAT?

先讓我們搞懂 (RDP)Remote Desktop Protocol

Ref: http://en.wikipedia.org/wiki/Remote_Desktop_Protocol

如法炮製試試 Port: 3389What if we do “Remote Port Forwarding” on port 3389?

Test: You can test by below command to check if successfully forwarded? $ telnet <Domain> <port>

!

Setup: Fill in the corresponding forwarded “Domain:Port” as right figure.

And… :)

原理就是這麼簡單若有其它需求請

如法炮製Follow above example to Forward Any Port you want

ReferenceRemote Development

http://crosbymichael.com/remote-development.html

Why We (Still) Believe in Working Remotely

http://blog.stackoverflow.com/2013/02/why-we-still-believe-in-working-remotely/

37signals Works Remotely

http://37signals.com/remote/

Coffitivity - Increase Your Creativity!

http://www.coffitivity.com/

Reference反向建⽴立 SSH Tunnel、免 VPN 連回公司

http://josephj.com/entry.php?id=312

Mosh (mobile shell)

http://mosh.mit.edu/

Vim Rocks!

http://www.slideshare.net/chenkaie/vim-rocks

TMUX Rocks!

http://www.slideshare.net/chenkaie/tmux-rocks

subversion-scripts (Throw away TortoiseSVN)

https://github.com/chenkaie/Tools/tree/master/subversion-scripts