yahoo-eng-team team mailing list archive

[xiaoyi chen <1939119@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

According to cloud-init document,
https://cloudinit.readthedocs.io/en/latest/topics/instancedata.html#using-instance-data
Both user-data scripts and #cloud-config data support jinja template rendering. When the first line of the provided user-data begins with, ## template: jinja cloud-init will use jinja to render that file.

I have tested user-data with jinja variable, it works as expected.
now my question is, does cloud-init support parsing the instance metadata when provided under "/etc/cloud/cloud.cfg.d/ ?  

For example,
A config file /etc/cloud/cloud.cfg.d/99-lob_unmanaged.cfg is created with the below content in a VM on Azure cloud.

===
## template: jinja
#cloud-config
runcmd:
  - echo "{{ ds.meta_data.imds.compute.tags }}" > /root/vm_tags.txt
===

However, during the cloud-init initialization, the instance metadata is
not parsed and the file is created with the below data.

$ cat /root/vm_tags.txt
{{ ds.meta_data.imds.compute.tags }}

The scripts also have unparsed data.

]$ cat var/lib/cloud/instance/scripts/runcmd 
#!/bin/sh
echo "{{ ds.meta_data.imds.compute.tags }}" > /root/vm_tags.txt

Could anyone please help to confirm, is it a bug or expected result?

** Affects: cloud-init
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1939119

Title:
  cloud-init not parsing the instance metadata when provided under
  "/etc/cloud/cloud.cfg.d/

Status in cloud-init:
  New

Bug description:
  According to cloud-init document,
  https://cloudinit.readthedocs.io/en/latest/topics/instancedata.html#using-instance-data
  Both user-data scripts and #cloud-config data support jinja template rendering. When the first line of the provided user-data begins with, ## template: jinja cloud-init will use jinja to render that file.

  I have tested user-data with jinja variable, it works as expected.
  now my question is, does cloud-init support parsing the instance metadata when provided under "/etc/cloud/cloud.cfg.d/ ?  

  For example,
  A config file /etc/cloud/cloud.cfg.d/99-lob_unmanaged.cfg is created with the below content in a VM on Azure cloud.

  ===
  ## template: jinja
  #cloud-config
  runcmd:
    - echo "{{ ds.meta_data.imds.compute.tags }}" > /root/vm_tags.txt
  ===

  However, during the cloud-init initialization, the instance metadata
  is not parsed and the file is created with the below data.

  $ cat /root/vm_tags.txt
  {{ ds.meta_data.imds.compute.tags }}

  The scripts also have unparsed data.

  ]$ cat var/lib/cloud/instance/scripts/runcmd 
  #!/bin/sh
  echo "{{ ds.meta_data.imds.compute.tags }}" > /root/vm_tags.txt

  Could anyone please help to confirm, is it a bug or expected result?

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