Just a quick addition: you will probably need to add 'ldconfig /usr/local/lib' to the end of the install script. I saw errors without this when testing the install.
On Thursday, October 6, 2016 at 2:00:04 PM UTC-4, Nick (Cloud Platform Support) wrote: > > Hey Noah, > > Since the Ruby runtime runs on the Flexible Environment > <https://cloud.google.com/appengine/docs/flexible/>, you can use runtime: > custom > <https://cloud.google.com/appengine/docs/flexible/custom-runtimes/build> in > app.yaml and supply a Dockerfile (in which the first line will be "FROM > gcr.io/google_appengine/ruby") (see here > <https://github.com/GoogleCloudPlatform/ruby-docker> a link to the github > page of the Ruby runtime Docker image) which will install ImageMagick. > > To install ImageMagick in the Dockerfile, you'd probably want to create a > script that the Dockerfile runs, which will group together the many > commands needed to install the dependencies and build from source. The > script would look something like the following: > > #!/bin/bash > > apt-get -y install \ > build-essential \ > checkinstall \ > libx11-dev \ > libxext-dev \ > zlib1g-dev \ > libpng12-dev \ > libjpeg-dev \ > libfreetype6-dev \ > libxml2-dev > > apt-get -y build-dep imagemagick > > wget http://www.imagemagick.org/download/ImageMagick.tar.gz > > tar -xzvf ImageMagick.tar.gz > > cd ImageMagick* > > ./configure > > make > > make install > > > ... and the Dockerfile would include lines like: > > ADD . /app/ > > RUN chmod +x /app/install-imagick.sh > > RUN /app/install-imagick.sh > > > This will make ImageMagick available on the VM which runs your Ruby > process. You can then call the program from Ruby using any of the various > methods by which this can be done (see here a blog post > <http://mentalized.net/journal/2010/03/08/5-ways-to-run-commands-from-ruby/> > referencing 5 different ways to run commands from Ruby). > > Although you could run ImageMagick to resize images dynamically on each > request, this is not the most efficient way to go about it if all you > require are thumbnails. > > For thumbnails, I would recommend, whenever an image is uploaded, creating > a process that will use ImageMagick to create and store a resized version > for future use. You can use Cloud Pub/Sub > <https://cloud.google.com/pubsub/> to create "task queues" in this way. > The basic steps would be: > > 1. Receive the image upload and store the full image in Cloud Storage > 2. Push a message to the Pub/Sub topic you created to manage this workflow > (give it a name like "thumbnail-creation") > 3. Have a pool of instances with ImageMagick installed who will subscribe > to this topic > 4. When an instance receives a request corresponding to the published > message, have it download the image, and then resize and store the image as > a thumbnail > > > I hope this is helpful, let me know if you have any further questions; > I'll be happy to assist! > > Cheers, > > Nick > Cloud Platform Community Support > > On Tuesday, October 4, 2016 at 11:20:10 AM UTC-4, Noah Hines wrote: >> >> Hello. I followed the Ruby on Rails Bookshelf App tutorial and built a >> basic web app where users can upload pictures. I would like to have >> server-side image resizing, so that when you get a list of all the images >> (from cloud datastore), you don't have to download huge versions of >> everything. >> >> It looks like all the other languages have support for resizing Datastore >> images. Is this something that is planned for Ruby? Is there a solution >> that will work for me in the meantime? >> >> I've explored using ImageMagick, but that would require installing a >> binary and I'm not sure if that's possible or a good idea. >> >> If there's a known solution, I'd love to hear it! >> Thanks. >> > -- You received this message because you are subscribed to the Google Groups "Google App Engine" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at https://groups.google.com/group/google-appengine. To view this discussion on the web visit https://groups.google.com/d/msgid/google-appengine/634efa33-3e87-4f33-9a8f-75a3069d93bb%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
