/usr/share/pyshared/ZEO/component.xml is in python-zodb 1:3.10.5-0ubuntu3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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<sectiontype name="zeo">
<description>
The content of a ZEO section describe operational parameters
of a ZEO server except for the storage(s) to be served.
</description>
<key name="address" datatype="socket-binding-address"
required="yes">
<description>
The address at which the server should listen. This can be in
the form 'host:port' to signify a TCP/IP connection or a
pathname string to signify a Unix domain socket connection (at
least one '/' is required). A hostname may be a DNS name or a
dotted IP address. If the hostname is omitted, the platform's
default behavior is used when binding the listening socket (''
is passed to socket.bind() as the hostname portion of the
address).
</description>
</key>
<key name="read-only" datatype="boolean"
required="no"
default="false">
<description>
Flag indicating whether the server should operate in read-only
mode. Defaults to false. Note that even if the server is
operating in writable mode, individual storages may still be
read-only. But if the server is in read-only mode, no write
operations are allowed, even if the storages are writable. Note
that pack() is considered a read-only operation.
</description>
</key>
<key name="invalidation-queue-size" datatype="integer"
required="no"
default="100">
<description>
The storage server keeps a queue of the objects modified by the
last N transactions, where N == invalidation_queue_size. This
queue is used to speed client cache verification when a client
disconnects for a short period of time.
</description>
</key>
<key name="invalidation-age" datatype="float" required="no">
<description>
The maximum age of a client for which quick-verification
invalidations will be provided by iterating over the served
storage. This option should only be used if the served storage
supports efficient iteration from a starting point near the
end of the transaction history (e.g. end of file).
</description>
</key>
<key name="monitor-address" datatype="socket-binding-address"
required="no">
<description>
The address at which the monitor server should listen. If
specified, a monitor server is started. The monitor server
provides server statistics in a simple text format. This can
be in the form 'host:port' to signify a TCP/IP connection or a
pathname string to signify a Unix domain socket connection (at
least one '/' is required). A hostname may be a DNS name or a
dotted IP address. If the hostname is omitted, the platform's
default behavior is used when binding the listening socket (''
is passed to socket.bind() as the hostname portion of the
address).
</description>
</key>
<key name="transaction-timeout" datatype="integer"
required="no">
<description>
The maximum amount of time to wait for a transaction to commit
after acquiring the storage lock, specified in seconds. If the
transaction takes too long, the client connection will be closed
and the transaction aborted.
</description>
</key>
<key name="authentication-protocol" required="no">
<description>
The name of the protocol used for authentication. The
only protocol provided with ZEO is "digest," but extensions
may provide other protocols.
</description>
</key>
<key name="authentication-database" required="no">
<description>
The path of the database containing authentication credentials.
</description>
</key>
<key name="authentication-realm" required="no">
<description>
The authentication realm of the server. Some authentication
schemes use a realm to identify the logical set of usernames
that are accepted by this server.
</description>
</key>
<key name="pid-filename" datatype="existing-dirpath"
required="no">
<description>
The full path to the file in which to write the ZEO server's Process ID
at startup. If omitted, $INSTANCE/var/ZEO.pid is used.
</description>
<metadefault>$INSTANCE/var/ZEO.pid (or $clienthome/ZEO.pid)</metadefault>
</key>
<!-- DM 2006-06-12: added option -->
<key name="drop-cache-rather-verify" datatype="boolean"
required="no" default="false">
<description>
indicates that the cache should be dropped rather than
verified when the verification optimization is not
available (e.g. when the ZEO server restarted).
</description>
</key>
</sectiontype>
</component>
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