Trouble-shooting the development installation


The following documentation is deprecated. The approved installation is via Docker.

Image processing isn’t working

If adding images to apps or extensions doesn’t seem to work then there’s a couple of settings you should check.

Checking your image settings

Check that CELERY_ALWAYS_EAGER is set to True in your settings file. This means it will process tasks without a celery worker running:


If that yields no joy you can try running a celery worker in the foreground, set CELERY_ALWAYS_EAGER = False and run:

celery -A olympia worker -E


This requires a RabbitMQ server to be set up as detailed in the Celery instructions.

This may help you to see where the image processing tasks are failing. For example it might show that Pillow is failing due to missing dependencies.

Checking your Pillow installation (Ubuntu)

When you run you should see at least JPEG and ZLIB are supported

If that’s the case you should see this in the output of pip install -I Pillow:

*** TKINTER support not available
--- JPEG support available
--- ZLIB (PNG/ZIP) support available
*** FREETYPE2 support not available
*** LITTLECMS support not available

If you don’t then this suggests Pillow can’t find your image libraries:

To fix this double-check you have the necessary development libraries installed first (e.g: sudo apt-get install libjpeg-dev zlib1g-dev)

Now run the following for 32bit:

sudo ln -s /usr/lib/i386-linux-gnu/ /usr/lib
sudo ln -s /usr/lib/i386-linux-gnu/ /usr/lib

Or this if your running 64bit:

sudo ln -s /usr/lib/x86_64-linux-gnu/ /usr/lib
sudo ln -s /usr/lib/x86_64-linux-gnu/ /usr/lib


If you don’t know what arch you are running run uname -m if the output is x86_64 then it’s 64-bit, otherwise it’s 32bit e.g. i686

Now re-install Pillow:

pip install -I Pillow

And you should see the necessary image libraries are now working with Pillow correctly.

ES is timing out

This can be caused by number_of_replicas not being set to 0 for the local indexes.

To check the settings run:

curl -s localhost:9200/_cluster/state\?pretty | fgrep number_of_replicas -B 5

If you see any that aren’t 0 do the following:

Set ES_DEFAULT_NUM_REPLICAS to 0 in your local settings.

To set them to zero immediately run:

curl -XPUT localhost:9200/_settings -d '{ "index" : { "number_of_replicas" : 0 } }'