Warning
Running Keystone under HTTPD in the recommended (and tested) configuration does not support the use of Transfer-Encoding: chunked. This is due to a limitation with the WSGI spec and the implementation used by mod_wsgi. It is recommended that all clients assume Keystone will not support Transfer-Encoding: chunked.
Copy the file httpd/wsgi-keystone.conf to the appropriate location for your Apache server, most likely:
/etc/httpd/conf.d/wsgi-keystone.conf
Update this file to match your system configuration (for example, some distributions put httpd logs in the apache2 directory and some in the httpd directory; also, enable TLS).
Create the directory /var/www/cgi-bin/keystone/. You can either hardlink or softlink the files main and admin to the file keystone.py in this directory. For a distribution appropriate place, it should probably be copied to:
/usr/share/openstack/keystone/httpd/keystone.py
Keystone’s primary configuration file (etc/keystone.conf) and the PasteDeploy configuration file (etc/keystone-paste.ini) must be readable to HTTPD in one of the default locations described in Configuring Keystone.
If you are running with SELinux enabled (and you should be) make sure that the file has the appropriate SELinux context to access the linked file. If you have the file in /var/www/cgi-bin, you can do this by running:
$ sudo restorecon /var/www/cgi-bin
Putting it somewhere else requires you set up your SELinux policy accordingly.
Make sure that when using a token format that requires persistence, you use a token persistence driver that can be shared between processes. The SQL and memcached token persistence drivers provided with keystone can be shared between processes.
Warning
The KVS (keystone.token.persistence.backends.kvs.Token) token persistence driver cannot be shared between processes so must not be used when running keystone under HTTPD (the tokens will not be shared between the processes of the server and validation will fail).
For SQL, in /etc/keystone/keystone.conf set:
[token]
driver = keystone.token.persistence.backends.sql.Token
For memcached, in /etc/keystone/keystone.conf set:
[token]
driver = keystone.token.persistence.backends.memcache.Token
All servers that are storing tokens need a shared backend. This means that either all servers use the same database server or use a common memcached pool.