Commit 1c89984 introduced the ability to expose the owner of the instance.
However, this breaks Prometheus if there is no OwnerID in the reservation (Eg. if you are using a private EC2-API introduced by #4333)
Signed-off-by: Jannick Fahlbusch <git@jf-projects.de>
Allowing to set a custom endpoint makes it easy to monitor targets on non AWS providers with EC2 compliant APIs.
Signed-off-by: Jannick Fahlbusch <git@jf-projects.de>
* refactor: move targetGroup struct and CheckOverflow() to their own package
* refactor: move auth and security related structs to a utility package, fix import error in utility package
* refactor: Azure SD, remove SD struct from config
* refactor: DNS SD, remove SD struct from config into dns package
* refactor: ec2 SD, move SD struct from config into the ec2 package
* refactor: file SD, move SD struct from config to file discovery package
* refactor: gce, move SD struct from config to gce discovery package
* refactor: move HTTPClientConfig and URL into util/config, fix import error in httputil
* refactor: consul, move SD struct from config into consul discovery package
* refactor: marathon, move SD struct from config into marathon discovery package
* refactor: triton, move SD struct from config to triton discovery package, fix test
* refactor: zookeeper, move SD structs from config to zookeeper discovery package
* refactor: openstack, remove SD struct from config, move into openstack discovery package
* refactor: kubernetes, move SD struct from config into kubernetes discovery package
* refactor: notifier, use targetgroup package instead of config
* refactor: tests for file, marathon, triton SD - use targetgroup package instead of config.TargetGroup
* refactor: retrieval, use targetgroup package instead of config.TargetGroup
* refactor: storage, use config util package
* refactor: discovery manager, use targetgroup package instead of config.TargetGroup
* refactor: use HTTPClient and TLS config from configUtil instead of config
* refactor: tests, use targetgroup package instead of config.TargetGroup
* refactor: fix tagetgroup.Group pointers that were removed by mistake
* refactor: openstack, kubernetes: drop prefixes
* refactor: remove import aliases forced due to vscode bug
* refactor: move main SD struct out of config into discovery/config
* refactor: rename configUtil to config_util
* refactor: rename yamlUtil to yaml_config
* refactor: kubernetes, remove prefixes
* refactor: move the TargetGroup package to discovery/
* refactor: fix order of imports
* Allow getting credentials via EC2 role
This is subtly different than the existing `role_arn` solution, which
allows Prometheus to assume an IAM role given some set of credentials
already in-scope. With EC2 roles, one specifies the role at instance
launch time (via an instance profile.) The instance then exposes
temporary credentials via its metadata. The AWS Go SDK exposes a
credential provider that polls the [instance metadata endpoint][1]
already, so we can simply use that and it will take care of renewing the
credentials when they expire.
Without this, if this is being used inside EC2, it is difficult to
cleanly allow the use of STS credentials. One has to set up a proxy role
that can assume the role you really want, and launch the EC2 instance
with the proxy role. This isn't very clean, and also doesn't seem to be
[supported very well][2].
[1]:
http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ec2-instance-metadata.html
[2]: https://github.com/aws/aws-cli/issues/1390
* Automatically try to detect EC2 role credentials
The `Available()` function exposed on ec2metadata returns a simple
true/false if the ec2 metadata is available. This is the best way to
know if we're actually running in EC2 (which is the only valid use-case
for this credential provider.)
This allows this to "just work" if you are using EC2 instance roles.
