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NAME | SYNOPSIS | DESCRIPTION | SETUP GROUP FILES | OPTIONS | EXAMPLE | MIGRATION | PCP ENVIRONMENT | SEE ALSO | COLOPHON |
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PMLOGCONF(1) General Commands Manual PMLOGCONF(1)
pmlogconf - create/edit a pmlogger configuration file
pmlogconf [-cqrvV?] [-d groupsdir] [-g grouptag] [-h host] [-s
groupfile] configfile
pmlogconf may be used to create and modify a generic
configuration file for the PCP archiver, pmlogger(1).
If configfile does not exist, pmlogconf will create a generic
configuration file with a default set of enabled metrics and
logging intervals.
Once created, configfile may be used with the -c option to
pmlogger(1) to select performance metrics and specify logging
intervals for a PCP archive.
If configfile does exist, pmlogconf will prompt for input from
the user to enable or disable groups of related performance
metrics and to control the logging interval for each enabled
group.
Group selection requires a simple y (yes) or n (no) response to
the prompt Log this group?.
Other responses at this point may be used to select additional
control functions as follows:
m Report the names of the metrics in the current group.
q Finish with group selection (quit) and make no further
changes to this group or any subsequent group.
/pattern Make no change to this group but search for a group
containing pattern in the description of the group or
the names of the associated metrics.
A logging interval is specified by responding to the Logging
interval? prompt with the keywords once or default or a valid
pmlogger(1) interval specification of the form ``every N
timeunits'' or simply ``N timeunits '' (the every is optional)
where N is an unsigned integer and timeunits is one of the
keywords msec, millisecond, sec, second, min, minute, hour or the
plural form of one of the keywords.
When run from automated logging setup processes, the -c option is
used to indicate that pmlogconf is in auto-create mode and no
interactive dialog takes place. The output configfile has an
additional comment message and timestamp indicating this fact, so
that it can be identified and subsequently updated using -c
again. This option is not appropriate for interactive use of the
tool.
The -q option suppresses the logging interval dialog and
preserves the current interval from configfile.
More verbose output may be enabled with the -v option.
When an initial configfile is created, the default specifications
come from a set of group files below the groupsdir specified with
the -d option (the default groupsdir is
$PCP_VAR_DIR/config/pmlogconf which is most commonly correct, so
the -d option is rarely used in practice).
The directory structure below groupsdir is arbitrary as all
regular files will be found by recursive descent and considered,
so add-on products and PMDA developers can easily extend the
available defaults to pmlogconf by adding new directories and/or
group files below groupsdir.
These group files are processed in the following ways:
• When a new configfile is created, all group files are
processed.
• Whenever pmlogconf is run with an existing configfile,
groupsdir is traversed to see if any new groups have been
defined and should be considered for inclusion in configfile.
• When pmlogconf processes a group in configfile that is
enabled, the list of metrics associated with the group is
taken from the group file (and replaces any previous list of
metrics associated with this group in configfile).
• When either the -r (reprobe) or the -c (auto-create) command
line option is specified, every group (not just newly
discovered ones) is reprocessed to see if it should be
considered for inclusion in configfile.
• If a group is found in configfile but the corresponding group
does not exist below groupsdir (as would be the case when a
group is made obsolete by a PCP upgrade) then the handling of
the group depends on the mode in which pmlogconf is being run.
With -c the corresponding group is culled from configfile,
otherwise the corresponding group is unchanged in configfile.
In either case a warning is issued.
Each group file is structured as follows:
• The first line must contain #pmlogconf-setup 2.0
• Other lines beginning with # are treated as comments.
• Blank lines are ignored.
• One or more lines starting with the keyword ident are used to
provide the human-readable description of the group.
• Non-blank lines beginning with white space define metrics to
be associated with this group, one per line. Each metric
specification follows the rules for a pmlogger(1)
configuration, namely either the name of a non-leaf node in
the PMNS (implying all descendent names in the PMNS), or the
name of a leaf node in the PMNS optionally followed by one or
more instance names enclosed by ``['' and ``]''.
• A control line starting with one of the keywords probe or
force must be present.
• An optional logging interval control line begins with the
keyword delta followed by one of the pmlogger(1) interval
specification described above.
• probe control lines have the format:
probe metric [condition [state_rule] ]
where metric is the name of a PCP metric (must be a leaf node
in the PMNS, no instance specification is allowed, and it must
not be a derived metric) and the optional condition is the
keyword exists (true if metric exists, i.e. is defined in the
PMNS) or the keyword values (true if metric exists in the PMNS
and has one or more current values) or an expression of the
form
op val
where op is one of the awk(1) operators (==, !=, >, >=, <, <=,
~ (regular expression match) or !~ (negated regular expression
match)) and val is a value (arbitrary sequence of characters,
excluding a space) and the condition is true if there is some
instance of metric that makes the expression true.
If the condition is missing, the default is exists.
When an explicit condition is provided, there may also be an
optional state_rule of the form
? true_state : false_state
where true_state (applies if condition is true) and
false_state (applies if condition is false) are both taken
from the keywords include (include and enable the group and
the associated metrics in configfile), available (include and
disable the group in configfile - a user action of y as
described above is needed to enable the group and add the
associated metrics into configfile) or exclude (the group is
not considered for inclusion in configfile).
The default state_rule is
? available : exclude
• force control lines begin with the keyword force followed by
one of the states defined above, so one of the actions
include, exclude or available is applied unconditionally to
the group.
Probing is only done when a new group is being added to
configfile or when the -r command line option is specified. The
evaluation of the probing conditions is done by contacting
pmcd(1) on hostname (defaults to local:).
The available command line options are:
-c Enable non-interactive, auto-create mode.
-d groupsdir, --groups=groupsdir
Specify the path to the groupsdir directory.
-g grouptag, --group=grouptag
Query logging state for the specific logging group named
grouptag.
-h host, --host=host
Performance metrics source is pmcd(1) on host, rather than
on the default localhost.
-q, --quiet
Quiet mode, suppress logging interval dialog.
-r, --reprobe
Reconsider every group for inclusion in the configfile.
-s groupfile, --setup=groupfile
Report the default logging state for the one logging group
in groupfile. This is equivalent output to that produced by
the retired pmlogconf-setup shell script from earlier
versions of PCP.
-v, --verbose
Enable verbose mode.
-V, --version
Display version number and exit.
-?, --help
Display usage message and exit.
The following group file demonstrates all of the supported
syntactic elements.
#pmlogconf-setup 2.0
ident Example group file
ident ... more description
delta 1 minute
probe sample.secret.foo.one values ? include : exclude
sample.secret.foo.one
sample.secret.foo.bar # non-leaf in the PMNS
sample.colour [ red green ]
The current version of pmlogconf (2.0) supports a slightly
different format for configfile compared to earlier versions. If
an old version configfile is presented to pmlogconf it will be
converted to the new format.
Environment variables with the prefix PCP_ are used to
parameterize the file and directory names used by PCP. On each
installation, the file /etc/pcp.conf contains the local values
for these variables. The $PCP_CONF variable may be used to
specify an alternative configuration file, as described in
pcp.conf(5).
pmlogconf overrides any $PCP_DERIVED_CONFIG environment variable
to an empty string, for performance reasons.
pmlogconf honours the $PMCD_WAIT_TIMEOUT environment variable
when probing and creating new pmlogger configuration files. It
uses a default timeout value of 10 seconds for this, in the
absence of an environment setting.
pmcd(1), pmlogger(1), pcp.conf(5) and pcp.env(5).
This page is part of the PCP (Performance Co-Pilot) project.
Information about the project can be found at
⟨http://www.pcp.io/⟩. If you have a bug report for this manual
page, send it to pcp@groups.io. This page was obtained from the
project's upstream Git repository
⟨https://github.com/performancecopilot/pcp.git⟩ on 2024-06-14.
(At that time, the date of the most recent commit that was found
in the repository was 2024-06-14.) If you discover any rendering
problems in this HTML version of the page, or you believe there
is a better or more up-to-date source for the page, or you have
corrections or improvements to the information in this COLOPHON
(which is not part of the original manual page), send a mail to
man-pages@man7.org
Performance Co-Pilot PCP PMLOGCONF(1)
Pages that refer to this page: pcp(1), pcpcompat(1), pmdasockets(1), pmlogctl(1), pmlogger_check(1), pmlogger_daily(1), pmrepconf(1)
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HTML rendering created 2024-06-26 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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