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https://github.com/masbicudo/ufrj-org-info-trab-final


https://github.com/masbicudo/ufrj-org-info-trab-final

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README 

        
# Intro



Este é o meu trabalho final da disciplina de Organização da Informação da UFRJ.



# Uploading to AWS



## Creating an EC2 instance



After creating an AWS account, go to `Services`, then `EC2`.



Click the button `Launch instance`.



Select one image from the `Quick start` group

(it's the default group).



Be careful when searching for images, since results

can show paid instances from AWS Marketplace,

resulting in costs both with software and the instance itself.



Choose `Ubuntu Server 18.04 LTS (HVM), SSD Volume Type`, for example.



Choose `t2.micro` (free tier eligible).

Free tier is available in the 1st year of your AWS account.



Click the button `Review and Launch`, then `Launch`.



Now you will be asked for a key pair to connect via ssh.

Create one if you don't already have, and download the key pair.



## Installing the key



This is optional. It's meant to associate the key with the host, so that you don't have to indicate the key file

every time you want to connect to the instance.



First copy the `.pem` file you selected or created before to `~/.ssh/`.

In Windows `~` is equivalente to `%USERPROFILE%`.



Now in the `~/.ssh` folder, create a `config` file and add:



    Host ec2-0-0-0-0.us-east-2.compute.amazonaws.com

        IdentityFile ~/.ssh/key-file.pem



See [OpenSSH Config File Examples - nixCraft](https://www.cyberciti.biz/faq/create-ssh-config-file-on-linux-unix/) for more.



## Connecting for the first time



A strange message will appear if this is the first time

you connect to this instance, about the authenticity of the

server. Just type `yes`.



See [SSH: The authenticity of host  can't be established - StackOverflow](https://superuser.com/questions/421074/ssh-the-authenticity-of-host-host-cant-be-established) for more.



## Copying file via scp



Build the project and then copy the build folder to the instance:



    scp -r build [email protected]:./build



## Connecting via ssh



At the command line, connect via ssh:



    ssh [email protected]



## Running the server



After connecting via ssh, install nodejs (ref: https://tecadmin.net/install-latest-nodejs-npm-on-ubuntu/)



    curl -sL https://deb.nodesource.com/setup_13.x | sudo -E bash -

    sudo apt-get install nodejs



Then run the server, if you copied everything to the `build` folder already:



    cd build

    npm install

    sudo node server.js $(ec2metadata --local-ipv4)



## Keep process running after closing ssh connection



[Keep running a python program even after logging-off the ssh session [duplicate] - askubuntu](https://askubuntu.com/questions/921494/keep-running-a-python-program-even-after-logging-off-the-ssh-session)



### screen



The screen command can be used to keep a process running

in the server when the user closes the ssh connection.



ref: https://superuser.com/questions/454907/how-to-execute-a-command-in-screen-and-detach

ref: https://dev.to/bobbyiliev/how-to-keep-a-process-running-even-after-closing-ssh-connection-3cek



Create a new screen



    screen -S SOME_NAME_HERE



Detach from session:



    ctrl+a ctrl+d



Restore a previously created screen



    screen -R SOME_NAME_HERE



Lists the available screens



    screen -ls



Running nodejs server using `screen` in a single line:



    screen -dmS server sudo node server.js $(ec2metadata --local-ipv4)



# References



[How to keep a program running after closing SSH client - StackOverflow](https://askubuntu.com/questions/8653/how-to-keep-processes-running-after-ending-ssh-session)