pmdasimple - simple performance metrics domain agent
(PMDA)
$PCP_PMDAS_DIR/simple/pmdasimple [-d domain]
[-i port] [-l logfile] [-p] [-u
socket] [-U username]
pmdasimple is a simple Performance Metrics Domain Agent
(PMDA) which exports a small number of synthetic performance metrics.
The simple PMDA is shipped as source code and is designed to be an
aid for PMDA developers. In terms of code size and features, it is more
complex than the trivial PMDA, about the same as the txmon PMDA and less
complex than the sample PMDA. The source for the simple PMDA is a good
template from which production, customized PMDAs can be developed.
A brief description of the pmdasimple 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.
- -i
- Expect PMCD to connect to pmdasimple on the specified TCP/IP port.
port may be a port number or port name.
- -l
- Location of the log file. By default, a log file named simple.log
is written in the current directory of pmcd(1) when
pmdasimple 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.
- -p
- Expect PMCD to create a pipe and the connection to pmdasimple is
via standard input and standard output. This is the default connection
mode.
- -u
- Expect PMCD to connect to pmdasimple on the Unix domain socket
named socket.
- -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.
At most one of the options -i, -p and -u may
be specified.
If you want access the names, help text and values for the simple
performance metrics, do the following as root:
# cd $PCP_PMDAS_DIR/simple
# ./Install
If you want to undo the installation, do the following as
root:
# cd $PCP_PMDAS_DIR/simple
# ./Remove
pmdasimple 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.
- $PCP_PMCDCONF_PATH
- command line options used to launch pmdasimple
- $PCP_PMDAS_DIR/simple/help
- default help text file for the simple metrics
- $PCP_PMDAS_DIR/simple/Install
- installation script for the pmdasimple agent
- $PCP_PMDAS_DIR/simple/Remove
- undo installation script for the pmdasimple agent
- $PCP_PMDAS_DIR/simple/simple.conf
- configuration file for the dynamic instance domain that underlies the
simple.now performance metric. For a description, refer to the help
text file, or run the command
$ pminfo -T simple.now
- $PCP_PMDAS_DIR/simple/*.pmda_simple.so
- The DSO version of the PMDA. The same source is used to create both the
DSO and the daemon versions of the simple PMDA, and one or the other may
be installed as part of the dialog in the Install script.
- $PCP_LOG_DIR/pmcd/simple.log
- default log file for error messages and other information from
pmdasimple
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).
PCPIntro(1), pmcd(1), pmdasample(1),
pmdatrivial(1), pmdatxmon(1), PMDA(3),
pcp.conf(5) and pcp.env(5).