NAME¶

pmfind - find PCP services on the network

SYNOPSIS¶

pmfind [-q] [-m mechanism] [-s service] [-r] [-t timeout]

DESCRIPTION¶

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.

By default pmfind will search for all supported PCP services, however a specific PCP service to discover can be specified using the -s (or --service) option. Supported services are pmcd(1), pmproxy(1) and pmwebd(1).

The -m (or --mechanism) 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). Supported mechanisms are:

avahi

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.

probe=<net-address>/<mask-bits>

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).

shell

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).

The -r (or --resolve) option 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.

The -t (or --timeout) option sets the maximum amount of time that pmfind will take before interrupting the service discovery. The 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 the process.

The -q (or --quiet) option suppresses all output on the standard output stream.

FILES¶

$PCP_BINADM_DIR/discover

default path to address discovery scripts

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).

DIAGNOSTICS¶

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 occurred.

In the event of an error, a message will be generated on standard error that is intended to be self-explanatory.

SIGNALS¶

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.

SEE ALSO¶

PCPIntro(1), pmcd(1), pmproxy(1), pmwebd(1), pcp-kube-pods(1), PMAPI(3), pmDiscoverServices(3), pcp.conf(5) and pcp.env(5).