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Asked: 2026-05-10T21:37:22+00:00

I am currently using an Apache front end for my Subversion repository, in order

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I am currently using an Apache front end for my Subversion repository, in order to do LDAP authentication.

My setup is fairly vanilla, however I would like to be able to specify a ‘backup’ LDAP URL, in case the primary one is down. I can’t currently see a way to do this other then use a second location, or virtual host that points at the secondary LDAP server.

While this would technically work, it is not an optimal solution. I would like something that does not require users to manually select the backup URL.

This is currently Apache 2.2.3 on CentOS 5.

Sample entry from httpd.conf:

<VirtualHost *:80>  ServerName svn.example.com  ServerAlias svn.example.com svn   <Location /erx>   DAV svn   SVNPath '/usr/local/svn/repos'   Require valid-user   AuthzSVNAccessFile '/usr/local/svn/conf/svnaccess.conf'   AuthName 'SVN Repository'   AuthBasicProvider ldap   AuthType Basic   AuthzLDAPAuthoritative off   AuthLDAPURL 'ldap://ldapserver:389/searchstring' NONE   AuthLDAPBindDN 'bind'   AuthLDAPBindPassword password  </Location> </VirtualHost>
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1 Answer

  1. OpenLDAP uses a blank separated list of servers. Assuming that mod_ldap is using OpenLDAP, this may work:

    ldap://primary.server backup.server:389/searchstring

    If that doesn’t work, try including two blank separated URLs:

    ldap://primary.server:389/searchstring ldap://backup.server:389/searchstring

    Edit: mod_authnz_ldap seems to support this officially.

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