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Operation
Nodepool generally runs as a daemon under the command
nodepoold. Once started, it will frequently re-read the
configuration file and make any changes necessary (such as adding or
removing a provider, or altering image or quota configuration). If any
needed images are missing, it will immediately begin trying to build
those images. Periodically (once a day by default but configurable in
the cron: section of the config file) it will attempt to
create new versions of each image.
If a new image creation is successful, it will immediately start
using it when launching nodes (Nodepool always uses the most recent
image in the ready state). Nodepool will delete images that
are older than 8 hours if they are not the most recent or second most
recent ready images. In other words, Nodepool will always
make sure that in addition to the current image, it keeps the previous
image around. This way if you find that a newly created image is
problematic, you may simply delete it and Nodepool will revert to using
the previous image.
Command Line Tools
Usage
The general options that apply to all subcommands are:
nodepool --help
The following subcommands deal with nodepool images:
image-list
nodepool image-list --help
image-update
nodepool image-update --help
image-delete
nodepool image-delete --help
The following subcommands deal with nodepool nodes:
list
nodepool list --help
hold
nodepool hold --help
delete
nodepool delete --help
If Nodepool's database gets out of sync with reality, the following commands can help identify compute instances or images that are unknown to Nodepool:
alien-list
nodepool alien-list --help
alien-image-list
nodepool alien-image-list --help