Our maas LAN can't access the internet and has a internal apt-mirror site 192.168.3.6. I changed the mirror set of maas server's snippets/maas_proxy file as follows:

d-i     mirror/country string manual

d-i     mirror/http/hostname string 192.168.3.6

d-i     mirror/http/directory string /ubuntu

d-i     mirror/http/proxy string

I deployed two maas node. Dashboard show the two node's state are ready.
But node's cloud-init client changed the apt's sources.list like this:

## Note, this file is written by cloud-init on first boot of an instance

## modifications made here will not survive a re-bundle.

## if you wish to make changes you can:

## a.) add 'apt_preserve_sources_list: true' to /etc/cloud/cloud.cfg

##     or do the same in user-data

...

deb http://archive.ubuntu.com/ubuntu precise main

deb-src http://archive.ubuntu.com/ubuntu precise main

...

Directly use cobbler install node(without maas), the node apt's sources.list like:

...

deb http://192.168.3.6/ubuntu precise main

deb-src http://192.168.3.6/ubuntu precise main

...

My question is:

1. How to set user-data in maas? So that I can set cloud-init's mirror's url to 192.168.3.6 or prevent cloud-init to change mirror's url.


2. Maas node's file /home/ubuntu/.ssh/authorized_keys is empty. Is it caused by the mirror's setup?