cloud-init team mailing list archive

[SUDHAKAR REDDY KHANDI <skhandi@xxxxxxxxx>]

Hi
Thank you so much for spending time answering my questions. Much
appreciated.


I could see , cloud-init is looking into the config file below and finding
out it is an Azure cloud.But, on first boot,  who will generate this file
?  On first boot, cloud-init is supposed to go over all the datasource list
and find out which one matches right. I don't see this happening. It is
magically finding out that it is an azure cloud. Can someone explain how
cloud-init will detect the cloud-platform ?  if it is through config file,
who will be responsible for generating this config file ?

azureuser@sudhakar-newvm:/run/cloud-init$ cat
/etc/cloud/cloud.cfg.d/90_dpkg.cfg
# to update this file, run dpkg-reconfigure cloud-init
datasource_list: [ Azure ]


this is log file at  /var/log/cloud-init.log

2021-08-13 20:21:35,332 - util.py[DEBUG]: Cloud-init v.
21.2-3-g899bfaa9-0ubuntu2~18.04.1 running 'init-local' at Fri, 13 Aug 2021
20:21:35 +0000. Up 15.81 second
s.
2021-08-13 20:21:35,332 - main.py[DEBUG]: No kernel command line url found.
2021-08-13 20:21:35,332 - main.py[DEBUG]: Closing stdin.
2021-08-13 20:21:35,335 - util.py[DEBUG]: Writing to
/var/log/cloud-init.log - ab: [644] 0 bytes
2021-08-13 20:21:35,336 - util.py[DEBUG]: Changing the ownership of
/var/log/cloud-init.log to 102:4
2021-08-13 20:21:35,336 - util.py[DEBUG]: Attempting to remove
/var/lib/cloud/instance/boot-finished
2021-08-13 20:21:35,336 - util.py[DEBUG]: Attempting to remove
/var/lib/cloud/data/no-net
2021-08-13 20:21:35,337 - handlers.py[DEBUG]: start:
init-local/check-cache: attempting to read from cache [check]
2021-08-13 20:21:35,337 - util.py[DEBUG]: Reading from
/var/lib/cloud/instance/obj.pkl (quiet=False)
2021-08-13 20:21:35,337 - stages.py[DEBUG]: no cache found
2021-08-13 20:21:35,337 - handlers.py[DEBUG]: finish:
init-local/check-cache: SUCCESS: no cache found
2021-08-13 20:21:35,337 - util.py[DEBUG]: Attempting to remove
/var/lib/cloud/instance
2021-08-13 20:21:35,340 - stages.py[DEBUG]: Using distro class <class
'cloudinit.distros.ubuntu.Distro'>

*2021-08-13 20:21:35,340 - __init__.py[DEBUG]: Looking for data source in:
['Azure', 'None'], via packages ['', 'cloudinit.sources'] that matches
dependencies ['FILESYSTEM']


>>>>>> how azure datasource magically came up here ?*
2021-08-13 20:21:35,456 - __init__.py[DEBUG]: Searching for local data
source in: ['DataSourceAzure']
2021-08-13 20:21:35,456 - handlers.py[DEBUG]: start:
init-local/search-Azure: searching for local data from DataSourceAzure
2021-08-13 20:21:35,456 - __init__.py[DEBUG]: Seeing if we can get any data
from <class 'cloudinit.sources.DataSourceAzure.DataSourceAzure'>
2021-08-13 20:21:35,457 - __init__.py[DEBUG]: Update datasource metadata
and network config due to events: New instance first boot
2021-08-13 20:21:35,457 - handlers.py[DEBUG]: start: azure-ds/_get_data:
_get_data
2021-08-13 20:21:35,457 - handlers.py[DEBUG]: start:
azure-ds/check-platform-viability: found azure asset tag

Regards
Sudhakar Reddy.K

On Fri, Aug 13, 2021 at 4:42 AM Robert Schweikert <rjschwei@xxxxxxxx> wrote:

>
>
> On 8/12/21 5:03 PM, SUDHAKAR REDDY KHANDI wrote:
> >>>> Note the auto detection mode exists twice, once in the
> > code executed by the generator, i.e. tools/ds-identify and once in the
> > Python code where we look for the data source.
> >
> > Thanks for the reply. if you don't mind can you point the source  code
> for
> > " Python code where we look for the data source."
>
>
> cloudinit/sources/__init__.py
>
> contains: find_source()
>
> >
> > -Sudhakar Reddy.K
> >
> > On Thu, Aug 12, 2021 at 1:57 PM Robert Schweikert <rjschwei@xxxxxxxx>
> wrote:
> >
> >> Hi,
> >>
> >> On 8/12/21 4:25 PM, SUDHAKAR REDDY KHANDI wrote:
> >>> Hi
> >>>
> >>> I am new to cloud-init.I have been trying to find out how cloud-init
> >>> detects the cloud-platform (AZR/AWS/etc). someone point me where this
> >> code
> >>> is present(assume no datasource_list is configured)
> >>>
> >>> Please, let me know how cloud-init uses the "datasource_list" config?
> is
> >> it
> >>> a hint to cloud-init that it is a so-and-so cloud platform ?
> >>
> >> cloud-init checks the config and uses whatever is configure. If this
> >> does not exist in the configuration cloud-init will fall back to auto
> >> detection mode. Note the auto detection mode exists twice, once in the
> >> code executed by the generator, i.e. tools/ds-identify and once in the
> >> Python code where we look for the data source.
> >>
> >> HTH,
> >> Robert
> >>
> >>>
> >>> Regards
> >>> Sudhakar
> >>>
> >>>
> >>
> >> --
> >> Robert Schweikert                   MAY THE SOURCE BE WITH YOU
> >> Distinguished Engineer                       LINUX
> >> Technical Team Lead Public Cloud
> >> rjschwei@xxxxxxxx
> >> IRC: robjo
> >>
> >> --
> >> Mailing list: https://launchpad.net/~cloud-init
> >> Post to     : cloud-init@xxxxxxxxxxxxxxxxxxx
> >> Unsubscribe : https://launchpad.net/~cloud-init
> >> More help   : https://help.launchpad.net/ListHelp
> >>
> >
>
> --
> Robert Schweikert                   MAY THE SOURCE BE WITH YOU
> Distinguished Engineer                       LINUX
> Technical Team Lead Public Cloud
> rjschwei@xxxxxxxx
> IRC: robjo
>
>