KnpSnappyBundle - stderr: "wkhtmltopdf: cannot connect to X server " stdout: "" - symfony

Question

I'm trying to use the KnpSnappyBundle to create PDF files from twig templates.
I've followed this post to install wkhtmltopdf and it works when I do:
wkhtmltopdf http://www.google.com test.pdf
but when I try to create a PDF file from a controller:
$this->get('knp_snappy.pdf')->generateFromHtml(
$this->renderView('AcmePDFBundle:Default:template.html.twig'),
'../app/var/PDFfiles/PDF.pdf'
);
I'm getting this error:
request.CRITICAL: RuntimeException: The exit status code '1' says something went wrong:
stderr: "wkhtmltopdf: cannot connect to X server
"
stdout: ""
command: /usr/bin/wkhtmltopdf --lowquality '/tmp/knp_snappy532ca2272fba44.73835084.html' '../app/var/files/PDF.pdf'. (uncaught exception) at /home/me/MyServer/project/vendor/knplabs/knp-snappy/src/Knp/Snappy/AbstractGenerator.php line 304 [] []
Any idea of how to solve it?
This is my configuration for KnpSnappyBundle:
knp_snappy:
pdf:
enabled: true
binary: /usr/bin/wkhtmltopdf
options: []
image:
enabled: false
binary: /usr/bin/wkhtmltoimage
options: []

Answer 1

Resolved installing a precompiled version. now you can get your version from here (inspired by this out of date answer ):
http://wkhtmltopdf.org/downloads.html
and changed my config.yml to:
knp_snappy:
pdf:
enabled: true
binary: /usr/local/bin/wkhtmltopdf
options: []
image:
enabled: false
binary: /usr/local/bin/wkhtmltoimage
options: []
and now it works!

Answer 2

You must copy it into directory : /usr/local/bin, make sur it's executable and add symlink of wkhtmltopdf.sh like :
1- the command :
sudo apt-get install wkhtmltopdf
2 - insert the binary in directory /usr/bin so the browser can't have permission to execute in this directory.
You must copy the wkhtmltopdf.sh to directory /usr/local/bin cause the browser have permission in this directory like:
sudo cp /usr/bin/wkhtmltopdf.sh /usr/local/bin/wkhtmltopdf.sh
3 - After make sur the binary have permission of execution like :
sudo chmod a+x /usr/local/bin/wkhtmltopdf.sh
4 - so now you can test, it's work like:
/usr/local/bin/wkhtmltopdf.sh http://www.google.com google.pdf
it make download the pdf in the current directory in your terminal
5 - Optional
now you can add symlink in your directory /usr/local/bin like
ln -s /usr/local/bin/wkhtmltopdf.sh /usr/local/bin/wkhtmltopdf
6 - copy to the /usr/bin/wkhtmltoimage into /usr/local/bin/wkhtmltoimage like:
sudo cp usr/local/wkhtmltoimage usr/local/bin/wkhtmltoimage
8- make sur this is executable too:
sudo chmod a+x /usr/local/bin/wkhtmltoimage
7 - change the directory of binary in configuration of symfony in config/packages/knp_snappy.yaml :
knp_snappy:
pdf:
enabled: true
binary: /usr/local/bin/wkhtmltopdf
options: []
image:
enabled: false
binary: /usr/local/bin/wkhtmltoimage
options: []
I Hope it's help you