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# $OpenLDAP$
# Copyright 1999-2006 The OpenLDAP Foundation, All Rights Reserved.
# COPYING RESTRICTIONS APPLY, see COPYRIGHT.
H1: Monitoring Slapd
H1: Monitoring
{{slapd}}(8) supports an optional {{TERM:LDAP}} monitoring interface
you can use to obtain information regarding the current state of
your {{slapd}} instance. For instance, the interface allows you
to determine how many clients are connected to the server currently.
The monitoring information is provided by a specialized backend,
the {{monitor}} backend. A manual page, {{slapd-monitor}}(5) is
available.
When the monitoring interface is enabled, LDAP clients may be used
to access information provided by the {{monitor}} backend, subject
to access and other controls.
When enabled, the {{monitor}} backend dynamically generates and
returns objects in response to search requests in the {{cn=Monitor}}
subtree. Each object contains information about a particular aspect
of the server. The information is held in a combination of user
applications and operational attributes. This information can be
access with {{ldapsearch(1)}}, with any general-purpose LDAP browser,
or with specialized monitoring tools. The {{SECT:Accessing Monitoring
Information}} section provides a brief tutorial on how to use
{{ldapsearch}}(1) to access monitoring information, while the
{{SECT:Monitor information}} section details monitoring information
base and its organization.
While support for the monitor backend is included in default builds
of slapd(8), this support requires some configuration to become
active. This may be done using either {{EX:cn=config}} or
{{slapd.conf}}(5). The former is discussed in the {{SECT:Monitor
configuration via cn=config}} section of this of this chapter. The
latter is discussed in the {{SECT:Monitor configuration via
slapd.conf(5)}} section of this chapter. These sections assume
monitor backend is built into {{slapd}} (e.g., {{EX:--enable-monitor=yes}},
the default). If the monitor backend was built as a module (e.g.,
{{EX:--enable-monitor=mod}}, this module must loaded. Loading of
modules is discussed in the {{SECT:Configuring slapd}} and {{SECT:The
slapd Configuration File}} chapters.
H2: Monitor configuration via cn=config(5)
{{This section has yet to be written.}}
H2: Monitor configuration via slapd.conf(5)
Configuration of the slapd.conf(5) to support LDAP monitoring
is quite simple.
First, ensure {{core.schema}} schema configuration file is included
by your {{slapd.conf}}(5) file. The {{monitor}} backend requires
it.
Second, instanticate the {{monitor backend}} by adding a
{{database monitor}} directive below your existing database
sections. For instance:
> database monitor
Lastly, add additional global or database directives as needed.
Like most other database backends, the monitor backend does honor
slapd(8) access and other adminstrative controls. As some monitor
information may be sensitive, it is generally recommend access to
cn=monitor be restricted to directory administrators and their
monitoring agents. Adding an {{access}} directive immediately below
the {{database monitor}} directive is a clear and effective approach
for controlling access. For instance, the addition of the following
{{access}} directive immediately below the {{database monitor}}
directive restricts access to monitoring information to the specified
directory manager.
> access to *
> by dn.exact="cn=Manager,dc=example,dc=com
> by * none
More information on {{slapd}}(8) access controls, see {{The access
Control Directive}} section of the {{SECT:The slapd Configuration
File}} chapter and {{slapd.access}}(5).
After restarting {{slapd}}(8), you are ready to start exploring the
monitoring information provided in {{EX:cn=config}} as discussed
in the {{SECT:Accessing Monitoring Information}} section of this
chapter.
One can verify slapd(8) is properly configured to provide monitoring
information by attempting to read the {{EX:cn=monitor}} object.
For instance, if the following {{ldapsearch}}(1) command returns the
cn=monitor object (with, as requested, no attributes), it's working.
> ldapsearch -x -D 'cn=Manager,dc=example,dc=com' -W \
> -b 'cn=Monitor' -s base 1.1
Note that unlike general purpose database backends, the database
suffix is hardcoded. It's always {{EX:cn=Monitor}}. So no {{suffix}}
directive should be provided. Also note that general purpose
database backends, the monitor backend cannot be instantiated
multiple times. That is, there can only be one (or zero) occurances
of {{EX:database monitor}} in the server's configuration.
H2: Accessing Monitoring Information
As previously discussed, when enabled, the {{monitor}} backend
dynamically generates and returns objects in response to search
requests in the {{cn=Monitor}} subtree. Each object contains
information about a particular aspect of the server. The information
is held in a combination of user applications and operational
attributes. This information can be access with {{ldapsearch(1)}},
with any general-purpose LDAP browser, or with specialized monitoring
tools.
This section provides a provides a brief tutorial on how to use
{{ldapsearch}}(1) to access monitoring information.
To inspect any particular monitor object, one performs search
operation on the object with a baseObject scope and a
{{EX:(objectClass=*)}} filter. As the monitoring information is
contained in a combination of user applications and operational
attributes, the return all user applications attributes (e.g.,
{{EX:'*'}}) and all operational attributes (e.g., {{EX:'+'}}) should
be requested. For instance, to read the {{EX:cn=Monitor}} object
itself, the {{ldapsearch}}(1) command (modified to fit your configuration)
can be used:
> ldapsearch -x -D 'cn=Manager,dc=example,dc=com' -W \
> -b 'cn=Monitor' -s base '(objectClass=*)' '*' '+'
When run against your server, this should produce output
similar to:
> dn: cn=Monitor
> objectClass: monitorServer
> structuralObjectClass: monitorServer
> cn: Monitor
> creatorsName:
> modifiersName:
> createTimestamp: 20061208223558Z
> modifyTimestamp: 20061208223558Z
> description: This subtree contains monitoring/managing objects.
> description: This object contains information about this server.
> description: Most of the information is held in operational attributes, which
> must be explicitly requested.
> monitoredInfo: OpenLDAP: slapd 2.4 (Dec 7 2006 17:30:29)
> entryDN: cn=Monitor
> subschemaSubentry: cn=Subschema
> hasSubordinates: TRUE
To reduce the number of uninteresting attributes returned, one
can be more selective when requesting which attributes are to be
returned. For instance, one could request the return of all
attributes allowed by the {{monitorServer}} object class (e.g.,
{{EX:@objectClass}}) instead of all user and all operational
attributes:
> ldapsearch -x -D 'cn=Manager,dc=example,dc=com' -W \
> -b 'cn=Monitor' -s base '(objectClass=*)' '@monitorServer'
This limits the output as follows:
> dn: cn=Monitor
> objectClass: monitorServer
> cn: Monitor
> description: This subtree contains monitoring/managing objects.
> description: This object contains information about this server.
> description: Most of the information is held in operational attributes, which
> must be explicitly requested.
> monitoredInfo: OpenLDAP: slapd 2.X (Dec 7 2006 17:30:29)
To return the names of all the monitoring objects, one performs a
search of {{EX:cn=Monitor}} with subtree scope and {{EX:(objectClass=*)}}
filter and requesting no attributes (e.g., {{EX:1.1}}) be returned.
> ldapsearch -x -D 'cn=Manager,dc=example,dc=com' -W -b 'cn=Monitor' -s sub 1.1
If you run this command you will discover that there are many objects
in the {{cn=Monitor}} subtree. The following section describes
some of the commonly available monitoring objects.
H2: Monitor Information
The {{monitor}} backend provides a wealth of information useful
for monitoring the slapd(8) contained in set of monitor objects.
Each object contains information about a particular aspect of
the server, such as a backends, a connection, or a thread.
Some objects serve as containers for other objects and used
to construct a hierarchy of objects.
In this hierarchy, the most superior object is {cn=Monitor}.
While this object primarily serves as a container for other
objects, most of which are containers, this object provides
information about this server. In particular, it provides the
slapd(8) version string. Example:
> dn: cn=Monitor
> monitoredInfo: OpenLDAP: slapd 2.X (Dec 7 2006 17:30:29)
Note: Examples in this section (and its subsections) have been
trimmed to show only key information.
{{slapd}}(8) supports a monitoring interface you can use to obtain
information regarding the current state of your {{slapd}} instance.
For instance, the interface allows you to determine how many clients
are connected to the server currently. The interface is accessed
used {{TERM:LDAP}} and is provided via the {{monitor}} backend. A
manual page, {{slapd-monitor}}(5) is available.
The monitor backend to {{slapd}} is not an actual database; if
enabled, it is automatically generated and dynamically maintained
by {{slapd}} with information about the running status of the daemon.
To inspect all monitor information, one can issue a subtree search
with base {{EX:cn=Monitor}} and filter {{EX:(objectClass=*)}},
requesting the return of all user (e.g., '*') and operational (e.g.,
'+' attributes. Many of the attributes provided by monitor backend
are operational attributes, and hence will not be returned unless
explicitly requested. For example:
> ldapsearch -x -D 'cn=Manager,dc=example,dc=com' -W -b 'cn=Monitor' '+' '*'
As there are may be many objects under {{EX:cn=Monitor}}, a search
with a narrower search criteria may be more appropriate.
Support for the monitor backend is included in slapd(8) in default
builds. The monitor backend may also be built as a loadable module.
The remainder of this section assumes slapd(8) was with with monitor
backend support (e.g., {{EX:--enable-monitor=yes}}, the default),
or build as a module (e.g., {{EX:--enable-monitor=mod}} and loaded
into slapd(8).
H2: Configuration
These {{slapd.conf}}(5) options apply to the monitor backend database.
That is, they must follow a {{EX:database monitor}} line and come
before any subsequent {{backend}} or {{database}} lines.
As opposed to most databases, the monitor database can be instantiated
only once, i.e. only one occurrence of {{EX:database monitor}}
can occur in the {{slapd.conf}}(5) file. Moreover, the suffix of
the database cannot be explicitly set by means of the suffix
directive. The suffix is automatically set to {{EX:cn=Monitor}}
The monitor backend honors access control semantics as indicated
in {{slapd.access}}(5), including the disclose access privilege,
on all currently implemented operations.
For understanding how to do the following with dynamic configuration,
see {{SECT:Configuring slapd}}
Also ensure that the {{core.schema}} file is loaded. The monitor
backend relies on some standard track {{attributeTypes}} that must
be already defined when the backend is started.
H3: Activate the monitor database
Put this in your {{slapd.conf}}(5) or via the {{config}} backend
> database monitor
You may also specify a {{rootpw}} below this
H3: Add ACLs
Here's an example you might use:
> access to dn.subtree="cn=Monitor"
> by dn.exact="uid=Admin,dc=my,dc=org" write
> by users read
> by * none
More information is detailed in {{slapd.access}}(5)
H2: Available Subsystems
There are various subsytems you can explicitly query for, with most
information being held in the {{monitoredInfo}} attribute.
H3: Backends
The main entry contains the type of backends enabled at compile
time; the child entries, for each backend, contain the type of the
backend. It should also contain the modules that have been loaded
if dynamic backends are enabled.
For example:
> dn: cn=Backend 1,cn=Backends,cn=Monitor
> structuralObjectClass: monitoredObject
> monitoredInfo: ldif
> monitorRuntimeConfig: TRUE
> supportedControl: 2.16.840.1.113730.3.4.2
> entryDN: cn=Backend 1,cn=Backends,cn=Monitor
> subschemaSubentry: cn=Subschema
> hasSubordinates: FALSE
>
> dn: cn=Backend 2,cn=Backends,cn=Monitor
> structuralObjectClass: monitoredObject
> monitoredInfo: hdb
> monitorRuntimeConfig: TRUE
> supportedControl: 1.3.6.1.1.12
> supportedControl: 2.16.840.1.113730.3.4.2
> supportedControl: 1.3.6.1.4.1.4203.666.5.2
> supportedControl: 1.2.840.113556.1.4.319
> supportedControl: 1.3.6.1.1.13.1
> supportedControl: 1.3.6.1.1.13.2
> supportedControl: 1.3.6.1.4.1.4203.1.10.1
> supportedControl: 1.2.840.113556.1.4.1413
> entryDN: cn=Backend 2,cn=Backends,cn=Monitor
> subschemaSubentry: cn=Subschema
> hasSubordinates: FALSE
>
> # Backend 3, Backends, Monitor
> dn: cn=Backend 3,cn=Backends,cn=Monitor
> structuralObjectClass: monitoredObject
> monitoredInfo: monitor
> monitorRuntimeConfig: TRUE
> supportedControl: 2.16.840.1.113730.3.4.2
> entryDN: cn=Backend 3,cn=Backends,cn=Monitor
> subschemaSubentry: cn=Subschema
> hasSubordinates: FALSE
In this example, the server has three backends: 1) a {{ldif}} backend,
2) a {{hdb}} backend, and 3) a {{monitor}} backend.
The {{EX:cn=Backends,cn=Monitor}} object, itself, provides a list
of available backends. The list of available backends all builtin
backends, as well as backends loaded by modules. For example:
> dn: cn=Backends,cn=Monitor
> monitoredInfo: config
> monitoredInfo: ldif
> monitoredInfo: monitor
> monitoredInfo: bdb
> monitoredInfo: hdb
This indicates the {{config}}, {{ldif}}, {{monitor}}, {{bdb}},
and {{hdb}} backends are available.
The {{EX:cn=Backends,cn=Monitor}} object is also a container
for available backend objects. Each available backend object
contains information about a particular backend. For example:
> dn: cn=Backend 0,cn=Backends,cn=Monitor
> monitoredInfo: config
> monitorRuntimeConfig: TRUE
> supportedControl: 2.16.840.1.113730.3.4.2
> seeAlso: cn=Database 0,cn=Databases,cn=Monitor
>
> dn: cn=Backend 1,cn=Backends,cn=Monitor
> monitoredInfo: ldif
> monitorRuntimeConfig: TRUE
> supportedControl: 2.16.840.1.113730.3.4.2
>
> dn: cn=Backend 2,cn=Backends,cn=Monitor
> monitoredInfo: monitor
> monitorRuntimeConfig: TRUE
> supportedControl: 2.16.840.1.113730.3.4.2
> seeAlso: cn=Database 2,cn=Databases,cn=Monitor
>
> dn: cn=Backend 3,cn=Backends,cn=Monitor
> monitoredInfo: bdb
> monitorRuntimeConfig: TRUE
> supportedControl: 1.3.6.1.1.12
> supportedControl: 2.16.840.1.113730.3.4.2
> supportedControl: 1.3.6.1.4.1.4203.666.5.2
> supportedControl: 1.2.840.113556.1.4.319
> supportedControl: 1.3.6.1.1.13.1
> supportedControl: 1.3.6.1.1.13.2
> supportedControl: 1.3.6.1.4.1.4203.1.10.1
> supportedControl: 1.2.840.113556.1.4.1413
> supportedControl: 1.3.6.1.4.1.4203.666.11.7.2
> seeAlso: cn=Database 1,cn=Databases,cn=Monitor
>
> dn: cn=Backend 4,cn=Backends,cn=Monitor
> monitoredInfo: hdb
> monitorRuntimeConfig: TRUE
> supportedControl: 1.3.6.1.1.12
> supportedControl: 2.16.840.1.113730.3.4.2
> supportedControl: 1.3.6.1.4.1.4203.666.5.2
> supportedControl: 1.2.840.113556.1.4.319
> supportedControl: 1.3.6.1.1.13.1
> supportedControl: 1.3.6.1.1.13.2
> supportedControl: 1.3.6.1.4.1.4203.1.10.1
> supportedControl: 1.2.840.113556.1.4.1413
> supportedControl: 1.3.6.1.4.1.4203.666.11.7.2
For each of these objects, monitorInfo indicates which backend the
information in the object is about. For instance, the {{EX:cn=Backend
3,cn=Backends,cn=Monitor}} object contains (in the example) information
about the {{bdb}} backend.
!block table
Attribute|Description
monitoredInfo|Name of backend
supportedControl|supported LDAP control extensions
seeAlso|Database objects of instances of this backend
!endblock
H3: Connections
......@@ -168,7 +319,6 @@ context.
For example:
> # Database 2, Databases, Monitor
> dn: cn=Database 2,cn=Databases,cn=Monitor
> structuralObjectClass: monitoredObject
> monitoredInfo: monitor
......@@ -184,7 +334,6 @@ H3: Listener
It contains the description of the devices the server is currently
listening on:
> # Listener 0, Listeners, Monitor
> dn: cn=Listener 0,cn=Listeners,cn=Monitor
> structuralObjectClass: monitoredObject
> monitorConnectionLocalAddress: IP=0.0.0.0:389
......@@ -349,11 +498,3 @@ Write waiters:
> entryDN: cn=Write,cn=Waiters,cn=Monitor
> subschemaSubentry: cn=Subschema
> hasSubordinates: FALSE
H2: Monitor search example
You should be able to use any LDAP client to retrieve this
information. Here's how you might do it using the
{{I: ldapsearch}}(1) client:
> ldapsearch -x -s base -b cn=monitor 'objectclass=*' +
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