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6.2. Overriding the LDAP UID attribute

As an administrator, you can configure an existing host to use accounts from LDAP. However, the values for a user (name, UID, GID, home directory, shell) in LDAP are different from the values on the local system. You can override the LDAP UID attribute by defining a different UID with the following procedure.

Conditions préalables

  • root access
  • Installed sssd-tools

Procédure

  1. Display the current UID of the user: 

    # id -u user-name
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    Replace user-name with the name of the user.

  2. Override the UID of the user’s account: 

    # sss_override user-add user-name -u new-UID
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    Replace user-name with the name of the user and replace new-UID with the new UID number.

  3. Expire the in-memory cache: 

    # sss_cache --users
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  4. After creating the first override using the sss_override user-add command, restart SSSD for the changes to take effect: 

    # systemctl restart sssd
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Verification steps

  • Verify that the new UID has been applied: 

    # id -u user-name
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  • Optional. Display the overrides for the user: 

    # sss_override user-show user-name
user@ldap.example.com::new-UID:::::
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    Exemple 6.2. Overriding the UID of the user

    To override the UID of the user sarah with UID 6666:

    1. Display the current UID of the user sarah: 

      # id -u sarah
1001
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    2. Override the UID of the user sarah's account with UID 6666: 

      # sss_override user-add sarah -u 6666
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    3. Manually expire the in-memory cache: 

      # sss_cache --users
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    4. Restart SSSD for the changes to take effect: 

      # systemctl restart sssd
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    5. Verify that the new UID is applied and overrides for the user display correctly: 

      # id sarah
6666

# sss_override user-show sarah
user@ldap.example.com::6666:::::
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