pmfind - find PCP services on the network
pmfind [-CqrS?] [-m mechanism] [-s
service] [-t timeout]
pmfind searches for instances of the specified PCP service being
advertised on the network and prints a list of URLs corresponding to the
services discovered. It can be used in conjunction with pmfind_check(1)
to automate the monitoring of remote PCP collector systems.
The available command line options are:
- -C, --containers
- Performs containers discovery as well, for each discovered pmcd(1)
- -m mechanism, --mechanism=mechanism
- This option sets the mechanism that pmfind uses when
performing service discovery. By default, or if the keyword all is
specified, every available mechanism will be used (iteratively). See the
``MECHANISMS'' section for a description of each available discovery
- -q, --quiet
- This option suppresses all output on the standard output stream.
- -r, --resolve
- Requests that DNS name resolution be attempted for the addresses of any
discovered services. The default is to display the network addresses of
any discovered services.
- -s service, --service=service
- By default pmfind will search for all supported PCP services,
however a specific PCP service to discover can be specified using
the -s option. Supported services are pmcd(1), and
- -S, --sources
- Reports source identifiers for each discovered pmcd(1) service.
These identifiers are unique for each host, and are formed using the
(non-optional) context labels available for every PCP collector. Because
the discovery process will often identify multiple paths to an individual
collector host, this option is an important part of the process of using
pmfind in conjunction with pmfind_check(1), to ensure only
one pmie(1) and/or pmlogger(1) process is started for each
discovered collector host. The source identifiers reported by
pmfind are the same as the source identifiers reported by the
pminfo(1) and pmseries(1) commands.
- -t seconds, --timeout=seconds
- Sets the maximum amount of time in seconds that pmfind will
take before interrupting the service discovery. The time argument
is a floating point number representing the number of seconds before
timing out. The default is to take as much time as is needed to complete
- -?, --help
- Display usage message and exit.
Supported mechanisms for service discovery are:
- Searches for services which are broadcasting using mDNS via
avahi-daemon(8). An optional suffix ",timeout=N"
may be added to limit the amount of time waiting for the avahi-daemon.
N is a floating point number specifying the number of seconds to
wait. The default is 0.5 seconds. This timeout may also be specified by
setting the environment variable AVAHI_DISCOVERY_TIMEOUT to the
desired number of seconds. If both are specified, then the value specified
in the environment variable takes precedence.
- Actively probes the given subnet for the requested PCP service(s).
<net-address> is an Inet or IPv6 network address and
<mask-bits> is the number of bits used to define the subnet.
For example, 192.168.1.0/24 defines an 8 bit subnet consisting of the
addresses 192.168.1.0 through 192.168.1.255. An optional suffix
",maxThreads=N" may be added to limit the number of
threads used while probing. The default is the value of FD_SETSIZE (which
is typically 1024) or the number of addresses in the subnet, whichever is
less. An optional suffix ",timeout=N" may be added to
limit the amount of time spent waiting for each connection attempt. N is a
floating point number specifying the number of seconds to wait. The
default is 0.02 seconds (20 milliseconds).
- Probes the list of addresses provided by scripts for requested PCP
service(s). Several optional, comma-separated parameters can also be
provided. The "path=DIR" option specifies the directory
where commands like pcp-kube-pods(1) are located (defaults to
$PCP_BINADM_DIR/discover/). This setting can be further restricted
to an individual command using the command=CMD option, but the
default is to use all available commands from the path. The
"maxThreads=N" option limits the number of threads used
while probing. The default is the value of FD_SETSIZE (which is typically
1024) or the number of addresses returned by the scripts, whichever is
less. The "timeout=N" option may be added to limit the
amount of time spent waiting for each connection attempt. N is a floating
point number specifying the number of seconds to wait. The default is 0.02
seconds (20 milliseconds).
pmfind will interrupt the service discovery process when one of the
following signals is received: SIGHUP, SIGPIPE, SIGINT, SIGTERM, SIGXFSZ,
SIGXCPU. pmfind will report any results which were discovered up to
point of the interruption.
The value of the exit status from the command is zero when services were
successfully located, one if no services were found, and two if an error
In the event of an error a message will be generated on standard
error that is intended to be self-explanatory.
- default path to address discovery scripts
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), pmfind_check(1), pmie(1),
pminfo(1), pmlogger(1), pmproxy(1), pmseries(1),
pcp-kube-pods(1), PMAPI(3), PMWEBAPI(3),
pmDiscoverServices(3), pcp.conf(5) and pcp.env(5).