Understanding Domain membership
After you create or modify your DB instance, the instance becomes a member of the domain. The Amazon console indicates the status of the domain membership for the DB instance. The status of the DB instance can be one of the following:
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joined – The instance is a member of the domain.
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joining – The instance is in the process of becoming a member of the domain.
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pending-join – The instance membership is pending.
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pending-maintenance-join – Amazon will attempt to make the instance a member of the domain during the next scheduled maintenance window.
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pending-removal – The removal of the instance from the domain is pending.
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pending-maintenance-removal – Amazon will attempt to remove the instance from the domain during the next scheduled maintenance window.
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failed – A configuration problem has prevented the instance from joining the domain. Check and fix your configuration before reissuing the instance modify command.
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removing – The instance is being removed from the domain.
A request to become a member of a domain can fail because of a network connectivity issue or an incorrect IAM role. For example, you might create a DB instance or modify an existing instance and have the attempt fail for the DB instance to become a member of a domain. In this case, either reissue the command to create or modify the DB instance or modify the newly created instance to join the domain.