pmdaroot is a special Performance Metrics Domain Agent (PMDA) which
cooperates closely with pmcd(1) and other PMDAs to provide limited
privileged services to these unprivileged processes.
In this role it is used to discover operating system containers
running on the local host. It also enables access to performance
data from within those containers by other PMDAs running on the bare-
metal host, using the pmdaRootConnect(3) and the associated namespace
Like all other PMDAs, it also exports performance metrics from the
domain it controls. Currently, this is limited to information about
the containers on the local system, and currently only Docker
containers can be detected.
-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 root.log
is written in the current directory of pmcd(1) when pmdaroot 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
-s Location of the unix(7) domain socket for communication with
clients seeking privileged operations. By default, a socket
file named $PCP_TMP_DIR/pmcd/root.socket is used.
default help text file for metrics exported by the root
default log file for error messages and other information
from the root PMDA.
default socket file for communication with root PMDA
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).
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
email@example.com. This page was obtained from the project's upstream
Git repository ⟨git://git.pcp.io/pcp⟩ on 2017-03-13. 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
Performance Co-Pilot PCP PMDAROOT(1)