How can I force Valohai to fetch a new version of my Docker image?

By default, Valohai will cache the Docker image and input files on the machine. You can view the execution's logs to see if cached files are being used.

There are a few special environment variables that you can set to clear the cache on the machine when launching a new execution. 

VH_NO_DATA_CACHE

Setting this to a true value (1, yes, true) will have the execution agent ignore any pre-existing cached data. This is useful if you have reused the same URL for a given datum (which, for reproducibility reasons, you should not generally do). The datum will still be written to the agent machine’s local cache.

VH_NO_IMAGE_CACHE

Setting this to a true value (1, yes, true) will have the execution agent ignore existing Docker images and force pulling them anew from the source.

VH_CLEAN

Setting this to a true value (1, yes, true) will have the execution agent forcibly clean all Docker images and cached data off the agent machine before and after the execution. This will take additional time.