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* ec2: Add support for AWS IMDS v2 (session-oriented)
AWS now supports a new version of fetching Instance Metadata[1].
Update cloud-init's ec2 utility functions and update ec2 derived
datasources accordingly. For DataSourceEc2 (versus ec2-look-alikes)
cloud-init will issue the PUT request to obtain an API token for
the maximum lifetime and then all subsequent interactions with the
IMDS will include the token in the header.
If the API token endpoint is unreachable on Ec2 platform, log a
warning and fallback to using IMDS v1 and which does not use
session tokens when communicating with the Instance metadata
service.
We handle read errors, typically seen if the IMDS is beyond one
etwork hop (IMDSv2 responses have a ttl=1), by setting the api token
to a disabled value and then using IMDSv1 paths.
To support token-based headers, ec2_utils functions were updated
to support custom headers_cb and exception_cb callback functions
so Ec2 could store, or refresh API tokens in the event of token
becoming stale.
[1] https://docs.aws.amazon.com/AWSEC2/latest/ \
UserGuide/ec2-instance-metadata.html \
#instance-metadata-v2-how-it-works
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The exoscale datasource defines a shorter timeout than the default (10)
but did not override url_max_wait, resulting in a single attempt being
made to wait for the metadata service.
In some rare cases, a race condition means the route to the metadata
service is not set within 10 seconds, and more attempts should be made.
This sets the url_max_wait for the datasource to 120.
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Make sure Exoscale supplements or overrides existing system config
setting cloud_config_modules instead of replacing it with a one item
list set-passords
LP: #1841454
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- dsidentify switches to the new Exoscale datasource on matching DMI name
- New Exoscale datasource added
Signed-off-by: Mathieu Corbin <mathieu.corbin@exoscale.ch>
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