Thanks Mike, that helps! I do indeed have ghostscript installed, and the /usr/bin/gs binary does exist, in the guacd image, which is great.
I've just tried it again (printed a simple Notepad document saying 'hello'). It seems to take a long time to think about whatever it is doing, since the web browser window does indicate at the bottom that something is happening, but then gives up / times out. What actually happens after I press 'Print' on the Windows machine (I am connecting to it via RDP) is that guacd says: guacd[949]: INFO: Print job created guacd[949]: INFO: Created PDF filter process PID=958 guacd[958]: INFO: Running gs and the web browser I am using (Chrome on Mac) flashes up "Waiting for www.myurl.com" at the bottom of the browser window a few times - but then nothing else happens. No further log items come up. (I am using 'docker logs -f guacd' to view these) Are there any built-in hooks to turn up debugging levels etc. in guacd when using it via docker, or should I do my normal mechanism of running /bin/sh in the docker container and running strace -f ? I wonder if it might be related to my use of Apache as a reverse proxy in front of the docker container; but that works fine for normal interactive use of guacamole, I've not had a problem yet. The Apache config is pretty much just: ProxyPass /remoteaccess/ http://docker.host:5678/guacamole/ but perhaps this interfers with printing somehow. Update - I have tried connecting direct to the docker image (I needed to find a plugin for Chrome to set the REMOTE_USER header as I am using HTTP authentication on my reverse proxy) and printing *does* work perfectly this way. So, it is not guacd, but rather something to do with my use of Apache as a reverse proxy. Going direct instead of via Apache, I get the following in guacd logs: guacd[993]: INFO: Print job created guacd[993]: INFO: Created PDF filter process PID=1002 guacd[1002]: INFO: Running gs guacd[993]: INFO: Print job closed guacd[993]: INFO: Ignoring printer cached configuration data Any pointers appreciated.. Many thanks :) Jonathan On 21 December 2017 at 01:31, Mike Jumper <mike.jum...@guac-dev.org> wrote: > On Dec 20, 2017 17:26, "Jonathan Hunter" <jmhunt...@gmail.com> wrote: > > ... > > The following command returns nothing for me: > > # docker exec -it guacamole find / -type f -name gs > > Am I barking up the wrong tree here? > > > Yep. You need to bark up the guacd tree instead. ;) > > It's not the guacamole image which needs GhostScript, but the guacd image. > It should be there, though. It's installed as part of the image build: > > https://github.com/apache/guacamole-server/blob/ > f72de10328ae39fcbf067333b0c2a2c9aecc441b/Dockerfile#L36 > > - Mike > > -- "If we knew what it was we were doing, it would not be called research, would it?" - Albert Einstein