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Chapter 38. Managing subID ranges manually

Manage subordinate ID (subID) ranges manually in Identity Management (IdM) to support containerized environments that require user namespace mapping. SubID ranges define the user and group IDs available for container processes.

38.1. Generating subID ranges using IdM CLI
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Generate and assign subID ranges to Identity Management (IdM) users using the CLI so that each user has a unique, centrally managed block of subordinate UIDs and GIDs.

Prerequisites

  • The IdM users exist.
  • You have obtained an IdM admin ticket-granting ticket (TGT). For details, see Using kinit to log in to IdM manually.
  • You have root access to the IdM host where you are executing the procedure.

Procedure

  1. Optional: Check for existing subID ranges: 

    # ipa subid-find

  2. If a subID range does not exist, select one of the following options:

    • Generate and assign a subID range to an IdM user: 

      # ipa subid-generate --owner=idmuser

Added subordinate id "359dfcef-6b76-4911-bd37-bb5b66b8c418"

  Unique ID: 359dfcef-6b76-4911-bd37-bb5b66b8c418
  Description: auto-assigned subid
  Owner: idmuser
  SubUID range start: 2147483648
  SubUID range size: 65536
  SubGID range start: 2147483648
  SubGID range size: 65536

    • Generate and assign subID ranges to all IdM users: 

      # /usr/libexec/ipa/ipa-subids --all-users

Found 2 user(s) without subordinate ids
  Processing user 'user4' (1/2)
  Processing user 'user5' (2/2)
Updated 2 user(s)
The ipa-subids command was successful

  3. Optional: Assign subID ranges to new IdM users by default: 

    # ipa config-mod --user-default-subid=True

Verification

  • Verify that the user has a subID range assigned: 

    # ipa subid-find --owner=idmuser

1 subordinate id matched

  Unique ID: 359dfcef-6b76-4911-bd37-bb5b66b8c418
  Owner: idmuser
  SubUID range start: 2147483648
  SubUID range size: 65536
  SubGID range start: 2147483648
  SubGID range size: 65536

Number of entries returned 1

38.2. Generating subID ranges using IdM WebUI interface
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Generate and assign subID ranges to Identity Management (IdM) users using the WebUI so that each user has a unique, centrally managed block of subordinate UIDs and GIDs.

Prerequisites

Procedure

  1. In the IdM WebUI interface expand the Subordinate IDs tab and choose the Subordinate IDs option.
  2. When the Subordinate IDs interface appears, click the Add button in the upper-right corner of the interface. The Add subid window appears.
  3. In the Add subid window choose an owner, that is the user to whom you want to assign a subID range.
  4. Click the Add button.

Verification

  • View the table under the Subordinate IDs tab. A new record shows in the table. The owner is the user to whom you assigned the subID range.

38.3. Viewing subID information about IdM users by using IdM CLI
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Search for and view subID ranges assigned to Identity Management (IdM) users by using the CLI.

Prerequisites

Procedure

  • To view the details about a subID range:

    • If you know the unique ID hash of the Identity Management (IdM) user that is the owner of the range: 

      $ ipa subid-show 359dfcef-6b76-4911-bd37-bb5b66b8c418

  Unique ID: 359dfcef-6b76-4911-bd37-bb5b66b8c418
  Owner: idmuser
  SubUID range start: 2147483648
  SubUID range size: 65536
  SubGID range start: 2147483648
  SubGID range size: 65536

    • If you know a specific subID from that range: 

      $ ipa subid-match --subuid=2147483670

1 subordinate id matched

  Unique ID: 359dfcef-6b76-4911-bd37-bb5b66b8c418
  Owner: uid=idmuser
  SubUID range start: 2147483648
  SubUID range size: 65536
  SubGID range start: 2147483648
  SubGID range size: 65536

Number of entries returned 1

38.4. Listing subID ranges using the getsubid command
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List subordinate ID ranges for Identity Management (IdM) or local users using the getsubids command to verify subID allocation for rootless containers. This helps ensure users have the necessary ID ranges for container operations.

Prerequisites

  • The idmuser user exists in IdM.
  • The shadow-utils-subid package is installed.
  • You can edit the /etc/nsswitch.conf file.

Procedure

  1. Open the /etc/nsswitch.conf file and configure the shadow-utils utility to use IdM subID ranges by setting the subid variable to the sss value: 

    [...]
subid: sss
    Note

    You can provide only one value for the subid field. Setting the subid field to the file value or no value instead of sss configures the shadow-utils utility to use the subID ranges from the /etc/subuid and /etc/subgid files.

  2. List the subID range for an IdM user: 

    $ getsubids idmuser
0: idmuser 2147483648 65536

    The first value, 2147483648, indicates the subID range start. The second value, 65536, indicates the size of the range.

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