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| <div class="section"> |
| <h2>Quota Configuration<a name="Quota_Configuration"></a></h2> |
| |
| |
| <p>Consult <a class="externalLink" href="https://github.com/apache/james-project/tree/master/server/app/src/main/resources/quota-template.xml">quota-template.xml</a> in GIT to get some examples and hints.</p> |
| |
| |
| <p>Use this configuration to define the type of quota storage used to persist the quotas.</p> |
| |
| |
| <p>This allow you to configure the behaviour of your James server in regard of the RFC 2087 Quotas.</p> |
| |
| |
| <p><a class="externalLink" href="https://tools.ietf.org/html/rfc2087">RFC 2087</a> introduces Quotas. A quota is related to a resource. In James, resources are MESSAGE (message count) and |
| STORAGE (size occupied by the messages in bytes). A quota is composed of two values. The first one is the maximum value |
| related to the value. The second one is the current value of the resource. Quota are handled for a Quota Root, a (potentially |
| configurable group of mailboxes.</p> |
| |
| |
| <p> |
| The goal of RFC-2087 and related James implementation is to forbid users to exceed a given value for available resources. |
| </p> |
| |
| |
| <p> |
| James' implementation is split in different components, and each one of them gets its own responsibility : |
| |
| </p> |
| <ul> |
| |
| <li>Quota Root Resolver : This component is responsible of the correspondence between mailboxes and QUOTA ROOT. A default implementation is |
| available and simply group mailboxes in QUOTA ROOT on the base of the owner name.</li> |
| |
| <li>Quota Manager : This component retrieves quota associated with a QUOTA ROOT. A store implementation is available and relies on other components. |
| A fake implementation is available in order to add no overhead.</li> |
| |
| <li>Max Quota Manager : This component retrieves maximum values associated with quotas and gives a way to potentially |
| (depending on the implementation) update these per QUOTA ROOT maximum values. Three implementation are available for now. A NoQuotaManager implementation |
| is read only and returns UNLIMITED maximum values. FixedMaxQuotaManager returns one and only one value for all user. You can configure these maximum values |
| threw the configuration files. A InMemoryPerUserMaxQuotaManager allows you to configure quota for each QUOTA ROOT. Note that it needs to be done threw |
| configuration to be persistent. And finally a Cassandra implementation allows to store maximum quota values in Cassandra.</li> |
| |
| <li>Current Quota Manager : This component can be omitted if you are running a fake QUOTA manager. inmemory implementation is an event updated cache on |
| top of a Quota calculator (that fetches every e-mail metadata of every mailboxes belonging to the QUOTA ROOT: it is expensive). A cassandra implementation |
| is also available.</li> |
| |
| <li>Quota Updater : This components allows to update current quota values. A fake implementation is available. A real, event base solution also exists.</li> |
| </ul> |
| |
| |
| |
| <p> |
| To choose the implementation you want for the given components you want simply have a look to the <a class="externalLink" href="https://github.com/apache/james-project/tree/master/server/app/src/main/resources/quota-template.xml">quota-template.xml</a> file. |
| </p> |
| |
| |
| <p> |
| Quota integration consists of : |
| |
| </p> |
| <ul> |
| |
| <li>Checks in the message manager. An operation that will bring the QUOTA ROOT over quota will be dropped. APPEND and COPY operations are concerned.</li> |
| |
| <li>A matcher is available (IsOverQuota) to better respond to client sending e-mail via SMTP to an over quota mailbox (and prevent the e-mail from being |
| stored in MailRepositories). This matcher just performs a call to the Quota Manager, and is efficient.</li> |
| |
| <li>A user can consult his Quotas using RFC 2087 IMAP commands. Note that SETQUOTA command is disabled. No quota configuration can be done threw IMAP.</li> |
| |
| <li>CLI authorises an admin to consult and manage ones quotas.</li> |
| </ul> |
| |
| |
| |
| <p> |
| The administration of QUOTAs can be done : |
| |
| </p> |
| <ul> |
| |
| <li>Threw configuration file. Note that this is required to persist a change made to the inmemory or fixed Max Quota |
| Manager. It needs a James reboot to take effect. Finally, using configuration file for setting maximum quota values |
| will override CLI set values. Avoid this option this persistent Max Quota Manager (for instance Cassandra)</li> |
| |
| <li>Threw the CLI : offers immediate configuration changes on quota maximum values. Note that if you are using either a |
| fixed or inmemory Max QUota Manager, your changes need to be done to the XML configuration to be persisted.</li> |
| </ul> |
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