红帽全球峰会38.2. Automatic ID ranges assignment
- IdM ID ranges
-
By default, a local domain IdM ID range (
ipa-local) is automatically assigned during the IdM server installation. Theipa-server-installcommand randomly selects and assigns a range of 200,000 IDs from a total of 10,000 possible ranges. Selecting a random range in this way significantly reduces the probability of conflicting IDs in case you decide to merge two separate IdM domains in the future.
Avoid modifying this IdM ID range after it is created. You can manually adjust the Distributed Numeric Assignment (DNA) ID ranges, using the commands described in Assigning DNA ID ranges manually. A DNA range matching the IdM ID range is automatically created during installation.
- DNA ID ranges
- If you have a single IdM server installed, it controls the whole DNA ID range. When you install a new replica and the replica requests its own DNA ID range, the initial ID range for the server splits and is distributed between the server and replica: the replica receives half of the remaining DNA ID range that is available on the initial server. The server and replica then use their respective portions of the original ID range for new user or group entries. Also, if the replica is close to depleting its allocated ID range and fewer than 100 IDs remain, the replica contacts the other available servers to request a new DNA ID range.
When you install a replica, it does not immediately receive an ID range. A replica receives an ID range the first time the DNA plug-in is used, for example when you first add a user.
If the initial server stops functioning before the replica requests a DNA ID range from it, the replica is unable to contact the server to request the ID range. Attempting to add a new user on the replica then fails. In such situations, you can find out what ID range is assigned to the disabled server, and assign an ID range to the replica manually.
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