pmdanutcracker1

Overview

This PMDA extracts performance data from NutCracker (or TwemProxy), a fast and lightweight proxy for memcached and Redis protocol.

Installation

Configure to export statistics via its stats interface (see --stats-port option to the nutcracker server). The corresponding configuration must be reflected in the $PCP_PMDAS_DIR/nutcracker/nutcracker.conf file.

# cd $PCP_PMDAS_DIR/nutcracker
# [ edit nutcracker.conf ]

Once this is setup, you can access the names and values for the nutcracker performance metrics by doing the following as root:

# cd $PCP_PMDAS_DIR/nutcracker
# ./Install

To uninstall, the following must be done as root:

# cd $PCP_PMDAS_DIR/nutcracker
# ./Remove

pmdanutcracker 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_PMDAS_DIR/nutcracker/nutcracker.conf

mandatory configuration file listing monitored memcache or Redis instances

$PCP_PMDAS_DIR/nutcracker/Install

installation script for the pmdanutcracker agent

$PCP_PMDAS_DIR/nutcracker/Remove

undo installation script for the pmdanutcracker agent

$PCP_LOG_DIR/pmcd/nutcracker.log

default log file for error messages from pmdanutcracker

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).