• PDF Preview unavailable on Docker installation

  • Problems with installing OpenKM? No problemo, the solution is closer than you think.
Problems with installing OpenKM? No problemo, the solution is closer than you think.
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 #53598  by Kimbaras
Hi all,

First of all sorry if this is not the correct section.

I've just installed OpenKM 6.3.11 through Docker (using the latest image) and seems to be working for the most part.
I'm able to login, navigate, upload, download etc. yet the preview of PDF docs upload is unavailable...

Checked the logs and there are no errors reported in either catalina or openkm.log

Is something else required for the preview to be available on the docker setup?

 #53601  by Kimbaras
Think I resolved the issue...

So it seems the latest docker image is effectively missing some files / configs...

Basically I've confronted the docker installation with a different Tomcat installation I've previously done (which is working correctly) and in the config I've noticed the following config


was NOT set on the Docker installation. So I've copied the "pdf2swf" executable file from the Tomcat installation (file provided by the bundle or the installer, can't remember) to the Docker container, updated the config from the Administration panel and puff the previews are working now.

So happy to have the issue resolved not happy as it seems the official docker image is missing a couple of things :?

Disclaimer: I've modified a little the docker-compose file by not using the docker MySQL (using a different DB server) and I'm using openkm/openkm-ce:latest instead of openkm/openkm-ce:6.3.9 as suggested by the docs.

Hope this helps someone and / or the devs to update the docker image
 #53604  by jllort
OpenKM it uses PDF.js to preview documents, with default configuration without changing anything in the configuration should preview PDF files by default. it is not required installing anything in docker to preview PDF files.

* Check what previewer do you have configured, if you changed revert to PDF.js again
* Can share a screenshot for better understanding ( if possible share a sample PDF here because I would like to test in our development environment )
 #53606  by Kimbaras
Hey, thanks for the reply!

From what I see there is no preview, at least in the docker image I'm using (which is image: openkm/openkm-ce:latest in the docker-compose file).
Attached you'll find what I mean (see
pdf_unavailable.png (146.54 KiB) Viewed 371 times
pdf_unavailable_config.png (261.96 KiB) Viewed 371 times
Also the pdf file
(12.18 KiB) Downloaded 4 times

By the way, I don't think it's a file issue as I had the same behaviour with the attached test file as well with different PDFs.
If you think it is a file issue (and I'd be curious if that's the case) I'll upload also the one correctly previewing in the following screens.

Here is one of the working container I got to work and as you can see in the
pdf_preview_ok.png (1020.51 KiB) Viewed 371 times
pdf_ok_config.png (278.55 KiB) Viewed 371 times

From what I can tell, after setting the "swftools.pdf2swf" config (as it was pre-configured in a bundled Tomcat or through the installer) it started to work.

Let me know if you need more details.

EDIT: forgot to mention, the screens with the issue are from a newly deployed container, so nothing did on that one (deployed the container, set the correct config to the DB and login) so that is "as-standard-as-possible" situation.

 #53609  by jllort
In your configuration what is the value of the configuration parameter named "system.previewer" ( Administration > configuration parameters )
 #53636  by jllort
I have flexpaper too, I attach some screenshots:
Selección_062.png (91.42 KiB) Viewed 23 times
Be sure you have disabled the "Acrobat plugin preview"
Selección_063.png (61.24 KiB) Viewed 23 times

About Us

OpenKM is part of the management software. A management software is a program that facilitates the accomplishment of administrative tasks. OpenKM is a document management system that allows you to manage business content and workflow in a more efficient way. Document managers guarantee data protection by establishing information security for business content.