Boot images are delivered to MAAS via the simplestreams protocol. It is useful in some situations, such as testing, to mirror the images locally so that you don't need to repeatedly pull them down over a slower Internet link.
First, install the required packages on the host where you wish to store the mirrored images:
sudo apt-get install simplestreams ubuntu-cloudimage-keyring apache2
Now you can pull the images over using the mirroring tools for simplestreams. This example gets the daily trusty (14.04) and precise (12.04) images for the amd64/generic and amd64/hwe-t architectures:
sudo sstream-mirror --keyring=/usr/share/keyrings/ubuntu-cloudimage-keyring.gpg http://maas.ubuntu.com/images/ephemeral-v2/daily/ /var/www/html/maas/images/ephemeral-v2/daily 'arch=amd64' 'subarch~(generic|hwe-t)' 'release~(trusty|precise)' --max=1
This may take a while as hundreds of megabytes will be downloaded.
The images will be written to the local disk and you can verify their presence by browsing to
<server> with your own server's name).
It is a good idea to configure a
cron job to repeat this import on a regular
basis to keep your mirror up-to-date.
You can do this using the API or the web UI. To do this via the API you can
maas (see maascli) command, logged in as the admin user:
maas <profile> boot-sources create url=http://<server>keyring_filename=/usr/share/keyrings/ubuntu-cloudimage-keyring.gpg
And then initiate the download with:
maas <profile> boot-resources import
See bootsources for more detail.
In the web UI, browse to the Settings tab as the admin user and scroll down to the "Boot Images" section. There you will find input boxes for the Sync URL and the keyring path, which should be set as the values in the API example above.
The import is initiated by browsing to the Images tab and following the instructions on that page.