NAME¶
pmdatrivial - trivial performance metrics domain agent (PMDA)
SYNOPSIS¶
$PCP_PMDAS_DIR/trivial/pmdatrivial [
-d domain] [
-l
logfile] [
-U username]
DESCRIPTION¶
pmdatrivial is the simplest possible Performance Metrics Domain Agent
(PMDA) which exports a single performance metric, the time in seconds since
the 1st of January, 1970.
The trivial PMDA is shipped as source code and is designed to be an aid for PMDA
developers.
A brief description of the
pmdatrivial command line options follows:
- -d
- It is absolutely crucial that the performance metrics domain number
specified here is unique and consistent. That is, domain should be
different for every PMDA on the one host, and the same domain
number should be used for the same PMDA on all hosts.
- -l
- Location of the log file. By default, a log file named trivial.log
is written in the current directory of pmcd(1) when
pmdatrivial is started, i.e. $PCP_LOG_DIR/pmcd. If the log
file cannot be created or is not writable, output is written to the
standard error instead.
- -U
- User account under which to run the agent. The default is the unprivileged
"pcp" account in current versions of PCP, but in older versions
the superuser account ("root") was used by default.
INSTALLATION¶
If you want access to the names, help text and values for the trivial
performance metrics, do the following as root:
# cd $PCP_PMDAS_DIR/trivial
# ./Install
If you want to undo the installation, do the following as root:
# cd $PCP_PMDAS_DIR/trivial
# ./Remove
pmdatrivial is launched by
pmcd(1) and should never be executed
directly. The Install and Remove scripts notify
pmcd(1) when the agent
is installed or removed.
FILES¶
- $PCP_PMCDCONF_PATH
- command line options used to launch pmdatrivial
- $PCP_PMDAS_DIR/trivial/help
- default help text file for the trivial metrics
- $PCP_PMDAS_DIR/trivial/Install
- installation script for the pmdatrivial agent
- $PCP_PMDAS_DIR/trivial/Remove
- undo installation script for the pmdatrivial agent
- $PCP_LOG_DIR/pmcd/trivial.log
- default log file for error messages and other information from
pmdatrivial
PCP ENVIRONMENT¶
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).
SEE ALSO¶
PCPIntro(1),
pmcd(1),
pmdasample(1),
pmdasimple(1),
pmdatxmon(1) and
PMDA(3).