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tmux on AWS

Part 1. Background
Part 2. Getting Set Up
Part 3. Using tmux
Part 4. Use tmux, Exit AWS, Log back in to AWS
Part 5. tmux: Summary of Primary Commands

Part 1. Background

Purpose

  • Lets you tile window panes in a command-line environment.
  • This in turn allows you to run, or keep an eye on, multiple programs within one terminal.
  • 🔑 With tmux, you can leave scripts running for a while, and it doesn’t matter if the terminal closes or you lose your internet connection for a moment; the script is running in the background

Resource

Tmux: A Gentle Introduction to tmux by Alek Shnayder

  • Installation
  • Getting In & Getting Out
  • Managing Panes
  • Custom Themes

Part 2. Getting Set Up

Step 1: A Background

Note 1: I am using fastai deep learning AMI
Note 2: tmux is already installed.
Note 3: On the fastai AWS AMI, tmux mouse mode is enabled, so hold down shift while selecting to copy to your local clipboard.
Note 4: If tmux is not installed:

  • Mac: brew install tmux
  • Linux: sudo apt-get install tmux
  • see the Resource above for instructions

Step 2: Log into AWS Instance

Note 1: Log into AWS Console and check that instance is running
Note 2: Ensure I am in the appropriate directory

pwd
/Users/reshamashaikh/.ssh

my syntax for logging in

ssh -i aws_fastai_gpu.pem [email protected] -L8888:localhost:8888

my example

ssh -i aws_fastai_gpu.pem [email protected] -L8888:localhost:8888 
The authenticity of host '54.164.78.42 (54.164.78.42)' can't be established.
ECDSA key fingerprint is SHA256:RoHkdmFaS+2/w/9CGncGb4cPO3lUutStxQ7BACCzopI.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added '54.164.78.42' (ECDSA) to the list of known hosts.
Welcome to Ubuntu 16.04.3 LTS (GNU/Linux 4.4.0-1039-aws x86_64)

 * Documentation:  https://help.ubuntu.com
 * Management:     https://landscape.canonical.com
 * Support:        https://ubuntu.com/advantage

  Get cloud support with Ubuntu Advantage Cloud Guest:
    http://www.ubuntu.com/business/services/cloud

5 packages can be updated.
0 updates are security updates.

(fastai) ubuntu@ip-172-31-10-243:~$

Update packages

sudo apt-get update

my example

(fastai) ubuntu@ip-172-31-10-243:~$ sudo apt-get update
Hit:1 http://us-east-1.ec2.archive.ubuntu.com/ubuntu xenial InRelease
Hit:2 http://us-east-1.ec2.archive.ubuntu.com/ubuntu xenial-updates InRelease
Hit:3 http://us-east-1.ec2.archive.ubuntu.com/ubuntu xenial-backports InRelease
Hit:4 http://security.ubuntu.com/ubuntu xenial-security InRelease                                                               
Hit:5 http://ppa.launchpad.net/openjdk-r/ppa/ubuntu xenial InRelease                                                            
Reading package lists... Done                     
(fastai) ubuntu@ip-172-31-10-243:~$

Part 3. Using tmux

See what version of tmux is running

tmux -V

my example

(fastai) ubuntu@ip-172-31-10-243:~$ tmux -V
tmux 2.1

See what tmux sessions are running

tmux ls

my example

(fastai) ubuntu@ip-172-31-10-243:~$ tmux ls
error connecting to /tmp/tmux-1000/default (No such file or directory)

Note: right now, I have no tmux sessions running.

tmux: start a tmux session

tmux
Note: A green bar will appear at the bottom

tmux start

Confirm tmux sessions are running

tmux ls

tmux commands

  • hit ctrl and b at the same time and then let go
  • then type subsequent command

example for creating two stacked windows
ctrl and b (at same time)
%

tmux help commands

ctrl+b ?

tmux: create a second window (horizontal)

ctrl+b "

tmux: create a third window (vertical)

ctrl+b %

Note: type ctrl+b then let go, and then type %

tmux: navigate between windows

ctrl+b [then arrow up/down/side]

tmux: MAGIC command

ctrl+b
🔑 This is the key prompt for using tmux.

tmux: kill current pane

ctrl+b x

tmux: detach session

This will detach the current session and return you to your normal shell. You can exit AWS with tmux running in background, and ssh into the instance again.
ctrl+b d

tmux: list sessions from normal shell

tmux ls

my example

(fastai) ubuntu@ip-172-31-10-243:~$ tmux ls
0: 1 windows (created Sat Nov 11 15:31:41 2017) [159x38]
(fastai) ubuntu@ip-172-31-10-243:~$

tmux: connect back to tmux session from normal shell

tmux a -t 0

tmux: kill tmux server, along will ALL sessions

tmux ls
tmux kill-server
tmux ls

my example

(fastai) ubuntu@ip-172-31-10-243:~$ tmux ls
0: 1 windows (created Sat Nov 11 15:31:41 2017) [159x38]
(fastai) ubuntu@ip-172-31-10-243:~$ tmux kill-server
(fastai) ubuntu@ip-172-31-10-243:~$ tmux ls
no server running on /tmp/tmux-1000/default
(fastai) ubuntu@ip-172-31-10-243:~$

Part 4. Use tmux, Exit AWS, Log back in to AWS

Start a tmux session on AWS

tmux ls
tmux
tmux ls
exit

my example

(fastai) ubuntu@ip-172-31-10-243:~$ tmux ls
no server running on /tmp/tmux-1000/default
(fastai) ubuntu@ip-172-31-10-243:~$ tmux
[detached (from session 0)]
(fastai) ubuntu@ip-172-31-10-243:~$ tmux ls
0: 1 windows (created Sat Nov 11 15:52:31 2017) [159x38]
(fastai) ubuntu@ip-172-31-10-243:~$ 
(fastai) ubuntu@ip-172-31-10-243:~$ exit
logout
Connection to 54.164.78.42 closed.

Log back into AWS & Confirm tmux session is still running

ssh -i aws_fastai_gpu.pem [email protected] -L8888:localhost:8888
tmux ls

my example

(fastai) ubuntu@ip-172-31-10-243:~$ tmux ls
0: 1 windows (created Sat Nov 11 15:52:31 2017) [159x38]
(fastai) ubuntu@ip-172-31-10-243:~$

Note: The tmux session is still running!

Part 5. tmux: Summary of Primary Commands

tmux_summary