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NAME | DESCRIPTION | JSON DATA SOURCES | SECURITY MODEL | INSTALLATION | FILES | PCP ENVIRONMENT | SEE ALSO | COLOPHON |
PMDAJSON(1) General Commands Manual PMDAJSON(1)
pmdajson - JSON PMDA
pmdajson is a Performance Metrics Domain Agent (PMDA) which exports
metrics from arbitrary sources generating Javascript Object Notation
(JSON) syntax, describing metric metadata and values.
Further details on the JSON format can be found at
http://www.json.org
pmdajson searches the directories listed in the "directory_list" and
"trusted_directory_list" config file options, looking for files
called "metadata.json". These JSON metadata files describe the names,
types, etc. of their associated JSON data. For example, let's assume
the following simple JSON data file:
{
"string_value": "testing, 1, 2, 3",
"read_count": 0
}
The associated metadata file would look like the following:
{
"metrics": [
{
"name": "string_value",
"pointer": "/string_value",
"type": "string",
},
{
"name": "read_count",
"pointer": "/read_count",
"type": "integer",
"description": "Times values read"
}
]
}
For more details on the JSON metadata format, see the README file
included with pmdajson.
JSON sources that come from "directory_list" config file option
aren't "trusted", and any command that needs to be run to get JSON
data is run as user "nobody".
JSON sources that come from "trusted_directory_list" config file
option are trusted, and any command that needs to be run to get JSON
data is run as user "root".
For more details on security, see the README file included with
pmdajson.
Install the json PMDA by using the Install script as root:
# cd $PCP_PMDAS_DIR/json
# ./Install
To uninstall, do the following as root:
# cd $PCP_PMDAS_DIR/json
# ./Remove
pmdajson 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_PMDAS_DIR/json/Install
installation script for the pmdajson agent
$PCP_PMDAS_DIR/json/Remove
undo installation script for the pmdajson agent
$PCP_PMDAS_DIR/json/config.json
configuration file for the pmdajson agent
$PCP_LOG_DIR/pmcd/json.log
default log file for error messages from pmdajson
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).
pmcd(1), pminfo(1) and pmprobe(1).
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@oss.sgi.com. This page was obtained from the project's upstream
Git repository ⟨git://git.pcp.io/pcp⟩ on 2017-07-05. 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 PMDAJSON(1)