crlhelper man page on Oracle

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crlhelper(8)							  crlhelper(8)

       crlhelper - Helper program used to store-and-forward CRLs

       crlhelper <semid> <parentpid> <directory> [prefix]

       A  helper  program  used	 by  the Apache httpd mod_revocator plug-in to
       store-and-forward CRLs from upstream to the various Apache processes in
       the  preform  MPM. This saves each process from having to fetch the CRL
       itself.	This is not expected to be run by end-users.

       The mod_revocator plug-in requires the mod_nss plug-in to also be  reg‐
       istered with this Apache httpd process.

       Whenever	 an  Apache  httpd process configured to use the mod_revocator
       plug-in is started, this program will be automatically invoked via ref‐
       erence	to   the   mod_revocator   configuration   file	 stored	 under
       /etc/httpd/conf.d/revocator.conf which contains the  following  default

	      #	  CRL Helper:
	      #	  This helper program does the actual CRL retrieval
	      #	  NOTE:	 Located at '/usr/bin/crlhelper' prior
	      #		 to 'mod_revocator-1.0.3-16'.
	      CRLHelper /usr/libexec/crlhelper

	      The  semaphore  which  corresponds  to the mod_revocator plug-in
	      registered with the Apache httpd process during startup.

	      The primary parent pid of the Apache httpd  process  into	 which
	      both the mod_nss and mod_revocator plug-ins have been loaded.

	      Since the mod_revocator plug-in depends upon the mod_nss plug-in
	      being configured, this option specifies the  destination	direc‐
	      tory of the NSS databases that will be associated with this exe‐
	      cutable specified by the following entry in  the	mod_nss	 plug-
	      in's /etc/httpd/conf.d/nss.conf configuration file:

		  #   Server Certificate Database:
		  #   The NSS security database directory that holds the
		  #   certificates and keys. The database consists
		  #   of 3 files: cert8.db, key3.db and secmod.db.
		  #   Provide the directory that these files exist.
		  NSSCertificateDatabase /etc/httpd/alias

	      Optional prefix to attach prior to the names of the NSS certifi‐
	      cate and key databases contained in the directory referenced  by
	      the  previous  argument  and specified by the following entry in
	      mod_nss plug-in's /etc/httpd/conf.d/nss.conf configuration  file
	      (must be uncommented in order to be utilized):

		  #   Database Prefix:
		  #   In order to be able to store multiple NSS databases
		  #   in one directory they need unique names. This option
		  #   sets the database prefix used for cert8.db and key3.db.
		  #NSSDBPrefix my-prefix-

       Report bugs to

       Rob Crittenden <>.

       Copyright  (c)  2013  Red  Hat,	Inc. This is licensed under the Apache
       License, Version 2.0 (the "License"); no one may use this  file	except
       in  compliance with the License. A copy of this license is available at

       Unless required by applicable law or agreed  to	in  writing,  software
       distributed under the License is distributed on an "AS IS" BASIS, WITH‐
       OUT WARRANTIES OR CONDITIONS OF ANY KIND, either	 express  or  implied.
       See  the	 License  for  the specific language governing permissions and
       limitations under the License.

Rob Crittenden			  Jul 3 2013			  crlhelper(8)

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