Hi, On 8/13/21 4:50 PM, SUDHAKAR REDDY KHANDI wrote:
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?
I have no idea how that works in Debian/Ubuntu or other distros. For SUSE images openSUSE & SLES we build the configuration with the settings into the images.
On first boot, cloud-init is supposed to go over all the datasource listand find out which one matches right.
Only if not configured in cloud.cfg or the kernel command line. If a list is specified then that list will be used, and only that list.
I don't see this happening. It is magically finding out that it is an azure cloud. Can someone explain howcloud-init will detect the cloud-platform ?
ds-identify contains the following comment: # search: determine which source or sources should be used # and write the result (datasource_list) to # /run/cloud-init/cloud.cfgYou'll have to do the legwork and read the code. If there is specific code that you have a problem with understanding then please point to the lines that give you trouble.
Later, Robert
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 <rjsch...@suse.com> wrote:On 8/12/21 5:03 PM, SUDHAKAR REDDY KHANDI wrote:Note the auto detection mode exists twice, once in thecode 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 codefor" 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 <rjsch...@suse.com>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 thiscodeis present(assume no datasource_list is configured) Please, let me know how cloud-init uses the "datasource_list" config?isita 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, RobertRegards Sudhakar-- Robert Schweikert MAY THE SOURCE BE WITH YOU Distinguished Engineer LINUX Technical Team Lead Public Cloud rjsch...@suse.com IRC: robjo -- Mailing list: https://launchpad.net/~cloud-init Post to : cloud-init@lists.launchpad.net 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 rjsch...@suse.com IRC: robjo
-- Robert Schweikert MAY THE SOURCE BE WITH YOU Distinguished Engineer LINUX Technical Team Lead Public Cloud rjsch...@suse.com IRC: robjo
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