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12.10. Dynamically Reloading Schema

By default, the schema files used by the Directory Server instance are loaded into the directory when it is started. This means that any new schema files added to the schema directory are not available for use unless the server is restarted. The Directory Server has a task which manually reloads the full schema for the Directory Server instance, including custom files, without requiring a server restart.
You can reload the schema using one of the following methods:

Note

Directory Server always additionally reloads the all schema files stored in the /usr/share/dirsrv/schema/ directory.

12.10.1. Dynamically Reloading the Schema Using the dsconf schema reload Command
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Use the dsconf schema reload command to reload the schema: 
# dsconf -D "cn=Directory Manager" ldap://server.example.com schema reload
Attempting to add task entry... This will fail if Schema Reload plug-in is not enabled.
Successfully added task entry cn=schema_reload_2018-08-28T09:45:48.027962,cn=schema reload task,cn=tasks,cn=config
To verify that the schema reload operation was successful, please check the error logs
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By default, Directory Server reloads the schema files stored in the directory set in the nsslapd-schemadir parameter. Optionally, pass the -d directory option to the command to reload the schema stored in a different directory.

12.10.2. Dynamically Reloading the Schema Using a cn=tasks Entry
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The cn=tasks,cn=config entry in the Directory Server configuration is a container entry for temporary entries the server uses to manage tasks. To initiate a schema reload operation, create a task in the cn=schema reload task,cn=tasks,cn=config entry.
By default, Directory Server reloads the schema files stored in the directory set in the nsslapd-schemadir parameter. For example, to reload the schema files stored in the directory set in this parameter: 
# ldapadd -D "cn=Directory Manager" -W -p 389 -h server.example.com -x

dn: cn=example_schema_reload,cn=schema reload task,cn=tasks,cn=config
objectclass: extensibleObject
cn: cn=example_schema_reload
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Optionally, specify the schemadir parameter, to reload the schema stored in a different directory. For example: 
# ldapadd -D "cn=Directory Manager" -W -p 389 -h server.example.com -x

dn: cn=example_schema_reload,cn=schema reload task,cn=tasks,cn=config
objectclass: extensibleObject
cn: cn=example_schema_reload
schemadir: /example/schema/
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When the task is completed, the entry is removed from the directory configuration.
For further details about the cn=schema reload task,cn=tasks,cn=config entry, see the cn=schema reload task section in the Red Hat Directory Server Configuration, Command, and File Reference.

12.10.3. Reloading The Schema in a Replication Topology
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The schema reload task is a local operation, so schema changes are not replicated in a multi-supplier environment if the schema is added to one supplier but not to the others. To load the new schema files on all of the supplier servers:
  1. Stop replication. See Section 15.9, “Disabling and Re-enabling Replication”.
  2. Copy the new schema file over and run the schema reload task for every supplier and replica server. See:
  3. Restart replication. See Section 15.9, “Disabling and Re-enabling Replication”.

12.10.4. Schema Reload Errors
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When the schema reload task runs, the server does not return whether it completed successfully. To verify the schema reload operation was successful, check the error logs. The schema reload has two tasks, first validating the schema file and then loading it.
A success message shows that the validation passed and the task finished. 
[06/Jan/2009:17:52:04.001214874 -0500] schemareload - Schema reload task starts (schema dir: default) ...
[06/Jan/2009:17:52:04.754335904 -0500] schemareload - Schema validation passed.
[06/Jan/2009:17:52:04.894255328 -0500] schemareload - Schema reload task finished.
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If there is a failure, then the logs show which step failed and why. 
[..] schemareload - Schema reload task starts (schema dir: /bogus) ...
[..] schema - No schema files were found in the directory /bogus
[..] schema_reload - schema file validation failed
[..] schemareload - Schema validation failed.
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