Create droplet with User Data

April 24, 2017 2k views
API Ubuntu 16.04
karolwojtyla820
By:
karolwojtyla820

Hi,
I getting started with DigitalOcean V2 API. When I tried create droplet with user data via API, server is created without executed my code. The same code when I did pasted in the browser and created droplet working properly.

This is my code:

$droplet->create('the-name', 
        'nyc1', 
        '512mb', 
        'ubuntu-16-04-x64', 
        false, 
        false, 
        false, 
        array($key),
        '
#!/bin/bash

sudo apt-get update
debconf-set-selections <<< "postfix postfix/mailname string domain.com"
debconf-set-selections <<< "postfix postfix/main_mailer_type string \'Internet Site\'"
apt-get install -y postfix
sudo postconf -e \'home_mailbox= Maildir/\'
sudo postconf -e \'virtual_alias_maps= hash:/etc/postfix/virtual\'

printf "kontakt@e-cleaner.net.pl root" > /etc/postfix/virtual
sudo postmap /etc/postfix/virtual
sudo systemctl restart postfix
sudo apt-get update
sudo ufw allow Postfix
echo \'export MAIL=~/Maildir\' | sudo tee -a /etc/bash.bashrc | sudo tee -a /etc/profile.d/mail.sh
sudo apt-get install s-nail
echo \'init\' | mail -s \'init\' -Snorecord

What is the reason of my problem?

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2 Answers
hansen April 24, 2017

Hi @karolwojtyla820

I don't see any closing ');, but I guess you just forgot to copy that.
I would guess it has something to do with the escaping of the '. Try changing all the \' to " and \'Internet Site\' to \"Internet Site\".
But from what I can remember, you need to #!/bin/bash on the first line - right now it's on the second line.

Try running this command on the server to see what the user-data actually is:

curl -w "\n" http://169.254.169.254/metadata/v1/user-data

https://www.digitalocean.com/community/tutorials/an-introduction-to-droplet-metadata

An Introduction to Droplet Metadata
by Mitchell Anicas
Update CloudInit link and conclusion Metadata is a service provided to DigitalOcean droplets that allows a droplet to access data about itself, i.e. its metadata. Examples of available droplet metadata include user-provided user data, droplet ID, data center region,...
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jtittle1 April 24, 2017

@karolwojtyla820

Instead of passing the data directly, I'd recommend passing it as a variable and using built-in functions such as file_get_contents.

For example:

<?php
$data = file_get_contents( '/path/to/userdata.sh' );

$droplet->create(
    'the-name', 
    'nyc1', 
    '512mb', 
    'ubuntu-16-04-x64', 
    false, 
    false, 
    false, 
    [ $key ],
    $data
);

You'd then create a new file called userdata.sh and pass the path to file_get_contents.

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