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Once you create an API User, you will see a link to download the openrc file. That file contains the relevant URL on the OS_AUTH_URL line.
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You need to specify a security group when launching an instance from API, otherwise it will not have connectivity. The default security group is named "firewall", so the parameter would look like: --security-group firewall
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API users have a separate keystore from your Cloud Control Panel user. Add your SSH keys via API in order to access them with your API user.
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You can monitor instance metrics via API with: openstack metric resource show [instance-uuid]
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You can view metrics data for each value under the metrics field with:
openstack metric measures show [metrics-value-uuid]