plucky (1) pmproxy.1.gz

Provided by: pcp_6.3.3-1_amd64 bug

NAME

       pmproxy - proxy for performance metrics collector and querying

SYNOPSIS

       pmproxy  [-AdfFt?]   [-c  conffile]  [-h  host[,host  ...]   [-i  ipaddress]  [-l logfile] [-L bytes] [-p
       port[,port ...]  [-r port[,port ...]  [-s sockname] [-U username] [-x outfile]

DESCRIPTION

       pmproxy acts as a protocol proxy, allowing Performance Co-Pilot (PCP) monitoring clients  to  connect  to
       one or more pmcd(1) and/or key-value servers (such as https://valkey.io/) indirectly.

       In  its  default  mode  of  operation pmproxy provides the REST API for PCP services (see PMWEBAPI(3) for
       details).  This includes provision of an Open Metrics - https://openmetrics.io - text interface  for  PCP
       metrics  at  /metrics,  real-time  access to PCP metrics through the /pmapi interfaces, and access to the
       fast, scalable PCP time series query capabilities offered in conjunction with  a  key-value  server  (see
       pmseries(1) for details) via the /query REST interfaces.

       pmproxy  can  be  deployed  in  a  firewall  domain, or on a cluster ``head'' node where the IP (Internet
       Protocol) address of the hosts where pmcd and/or a key-value  server  (such  as  https://valkey.io/)  are
       running  may  be  unknown  to  the  PCP  monitoring clients, but where the IP address of the host running
       pmproxy is known to these clients.  Similarly, the clients may have network connectivity only to the host
       where  pmproxy  is  running,  while there is network connectivity from that host to the hosts of interest
       where pmcd and/or a key-value server are running.

       The behaviour of the PCP monitoring clients is controlled by either the PMPROXY_HOST environment variable
       or  through  the  extended  hostname  specification  (see  PCPIntro(1) for details).  If neither of these
       mechanisms is used, clients will make their PMAPI(3) connections directly to pmcd.  If the proxy hostname
       syntax is used or PMPROXY_HOST is set, then this should be the hostname or IP address of the system where
       pmproxy is running, and the clients will connect to pmcd or a key-value  server  indirectly  through  the
       protocol proxy services of pmproxy.

OPTIONS

       The available command line options are:

       -A   Disable service advertisement.  By default, pmproxy will advertise its presence on the network using
            any available mechanisms (such as Avahi/DNS-SD), assisting remote monitoring tools with finding  it.
            These mechanisms are disabled with this option.

       -c conffile, --config=conffile
            Specify  the  path  to  an  optional  configuration  conffile,  with  format  as  described  in  the
            ``CONFIGURATION'' section.  This option implies pmproxy is running in timeseries mode.

       -d, --deprecated
            By default pmproxy prefers to run in the new timeseries  mode,  providing  REST  APIs,  asynchronous
            network  I/O,  scalable  time  series,  and  secure  connections  using  OpenSSL.   However,  legacy
            deployments may wish to use the original synchronous pmproxy implementation using libpcp networking;
            this can be achieved using this option.  Note that the -d and -t options are mutually exclusive.

       -f, --foreground
            By  default  pmproxy  is  started  as  a  daemon.  The -f option indicates that it should run in the
            foreground.  This is most useful when trying to diagnose problems with establishing connections.

       -F, --systemd
            Like -f, the -F option runs pmproxy in the foreground, but also does some housekeeping (like  create
            a  ``pid''  file  and  change  user  id).   This  is  intended for use when pmproxy is launched from
            systemd(1) and the daemonising has already been done by systemd(1) and does  not  need  to  be  done
            again by pmproxy, which is the case when neither -f nor -F is specified.

            At most one of -f and -F may be specified.

       -h host, --keyhost=host
            Specify  an  alternate  key-value server host to connect to for time series querying, overriding any
            configuration file settings.  This option implies pmproxy is running in timeseries mode.

       -i ipaddress, --interface=ipaddress
            This option is usually only used on hosts with more than one  network  interface  (very  common  for
            firewall  and  ``head''  node hosts where pmproxy is likely to be deployed to arbitrate access to an
            internal network).  If no -i options are specified pmproxy accepts PCP client connections on any  of
            its  host's IP addresses.  The -i option is used to specify explicitly an IP address that PCP client
            connections should be  accepted  on.   ipaddress  should  be  in  the  standard  dotted  form  (e.g.
            100.23.45.6).   The -i option may be used multiple times to define a list of IP addresses.  When one
            or more -i options is specified, attempted connections made  on  any  other  IP  addresses  will  be
            refused.

       -l logfile, --log=logfile
            By  default  a log file named pmproxy.log is written in the current directory.  The -l option causes
            the log file to be written to a given logfile instead of the default.  If  this  logfile  cannot  be
            created or is not writable, output is written to the standard error instead.

       -L bytes
            PDUs received by pmproxy from PCP monitoring clients are restricted to a maximum size of 65536 bytes
            by default to defend against Denial of Service attacks.  The -L option may be  used  to  change  the
            maximum incoming PDU size.

       -p port, --port=port
            Specify an alternate port number to listen on for client connections.  The default value is 44322.

       -r port, --keyport=port
            Specify an alternate key-value server port number to connect to for time series querying, overriding
            any configuration file settings.  This option implies pmproxy is running in timeseries mode.

       -s sockname, --socket=sockname
            Specify the path to a local unix domain socket (for platforms supporting this socket  family  only).
            The  default  value  is  $PCP_RUN_DIR/pmproxy.socket.   This  option  implies  pmproxy is running in
            timeseries mode.

       -t, --timeseries
            Operate in automatic archive timeseries discovery mode.  This mode  of  operation  will  enable  the
            PMWEBAPI(3)  REST APIs, dynamically and automatically detect active system archives being written by
            pmlogger(1) and import them into a key-value server (such as https://valkey.io/), for fast, scalable
            time  series  querying  described in pmseries(1).  Note that in this mode of operation, pmproxy only
            "log-tails" and ingests actively growing archives, e.g.  as  written  by  one  or  more  pmlogger(1)
            instances.   When  an  archive is first discovered (usually but not limited to pmproxy startup), all
            metadata is loaded and sent to the configured key-value server however note that  only  new  archive
            metric value data from the tail end of each archive is ingested.  Compressed archives never grow and
            so are ignored.  See the --load option to pmseries(1) for a supported mechanism for manually loading
            all  of  the  metric value data from previously collected (inactive) archives, whether compressed or
            not.  It would be normal, though not mandated, for a set of archives being manually loaded to  cover
            the  same  time  period,  e.g.  archive data for a particular week for one or more hosts in the same
            data-centre.

       -U username, --username=username
            Assume the identity of the given username before  starting  to  accept  incoming  packets  from  PCP
            monitoring clients.

       -x outfile
            Before the pmproxy logfile can be opened, pmproxy may encounter a fatal error which prevents it from
            starting.  By default the output describing this error is sent to /dev/tty but it may redirected  to
            outfile.

       -?, --help
            Display usage message and exit.

CONFIGURATION

       When  running  in  the  timeseries  mode  of  operation,  runtime configuration is relatively complex and
       typically handled via the $PCP_SYSCONF_DIR/pmproxy/pmproxy.conf file.  This file is in the common ``ini''
       format,  with  section  headers and individual variables and values with each section.  The configuration
       file installed as part of PCP documents every available section and option.

       At a high level, the [pmproxy] section can be used to explicitly enable or disable each of the  different
       protocols.

       The [keys] section allows connection information for one or more backing key-value server processes to be
       configured (hostnames and ports).  Note to access multiple  (scalable)  key-value  servers,  the  servers
       variable  in this section can be a comma-separated list of hostname:port pairs.  Alternatively, it can be
       a single key-value server host that will be queried using the "CLUSTER  INFO"  command  to  automatically
       configure multiple backing hosts.

       In  earlier  versions  of  PCP  (before 6) an alternative configuration setting section was used for this
       purpose - key-value servers were specified in the [pmseries] section and this  is  still  accepted  as  a
       fallback for backwards compatibility.

STARTING AND STOPPING PMPROXY

       Normally,  pmproxy  is  started  automatically  at boot time and stopped when the system is being brought
       down.  Under certain circumstances it is necessary to start or stop pmproxy manually.   To  do  this  one
       must become superuser and type

       # $PCP_RC_DIR/pmproxy start

       to start pmproxy, or

       # $PCP_RC_DIR/pmproxy stop

       to  stop  pmproxy.   Starting  pmproxy  when  it  is  already running is the same as stopping it and then
       starting it again.

       Normally pmproxy listens for PCP client connections on TCP/IP port number 44322 (as well  as  44323  with
       timeseries enabled) registered at https://www.iana.org/.  Either the environment variable PMPROXY_PORT or
       the -p command line option may be used to specify alternative port number(s) when pmproxy is started;  in
       each  case,  the  specification  is a comma-separated list of one or more numerical port numbers.  Should
       both methods be used or multiple -p options appear on the command line, pmproxy will listen on the  union
       of  the  set  of  ports  specified via all -p options and the PMPROXY_PORT environment variable.  If non-
       default ports are used with pmproxy care should be taken to ensure that PMPROXY_PORT is also set  in  the
       environment  of  any  client  application  that  will  connect  to  pmproxy,  or  that  the extended host
       specification syntax is used (see PCPIntro(1) for details).

DIAGNOSTICS

       If pmproxy is already running the message "Error: OpenRequestSocket bind: Address already  in  use"  will
       appear.  This may also appear if pmproxy was shutdown with an outstanding request from a client.  In this
       case, a request socket has been left in the TIME_WAIT state and until the system closes  it  down  (after
       some timeout period) it will not be possible to run pmproxy.

       In addition to the standard PCP debugging options, see pmdbg(1), pmproxy currently supports the debugging
       option context for tracing client connections and disconnections.

FILES

       $PCP_PMPROXYOPTIONS_PATH
            command line options for pmproxy when launched from $PCP_RC_DIR/pmproxy All the command line  option
            lines should start with a hyphen as the first character.

       $PCP_SYSCONFIG_DIR/pmproxy
            Environment  variables  that  will  be  set  when  pmproxy  executes.   Only  settings  of  the form
            "PMPROXY_VARIABLE=value" will be honoured.

       ./pmproxy.log
            (or $PCP_LOG_DIR/pmproxy/pmproxy.log when started automatically)
            All messages and diagnostics are directed here

       /etc/pki/tls
            default OpenSSL certificate database directory, optionally used for Secure Socket  Layer  connection
            in  timeseries  mode  of operation.  These certificates can be created and queried using the openssl
            tool, amongst others.

ENVIRONMENT

       In addition to the PCP environment variables described in the PCP ENVIRONMENT section  below,  there  are
       several  environment  variables  that influence the interactions between a PCP monitoring client, pmproxy
       and pmcd.

       PMCD_PORT
              For the PCP monitoring client this (or the default port number) is passed to pmproxy and  used  to
              connect to pmcd.  In the environment of pmproxy PMCD_PORT is not used.

       PMPROXY_HOST
              For  the  PCP  monitoring  client  this is the hostname or IP address of the host where pmproxy is
              running.  In recent versions of PCP (since version 3) this has been  superseded  by  the  extended
              hostname syntax (see PCPIntro(1) for details).

       PMPROXY_PORT
              For  the  PCP  monitoring  client  this is the port on which pmproxy will accept connections.  The
              default is 44322, as well as 44323 with timeseries enabled.

       PMCD_CONNECT_TIMEOUT, PMCD_RECONNECT_TIMEOUT and PMCD_REQUEST_TIMEOUT
              (see PCPIntro(1)) For the PCP monitoring client, setting these environment variables  will  modify
              the  timeouts  used  for interactions between the client and pmproxy (independent of which pmcd is
              being used).  For pmproxy these same environment variables control the  timeouts  between  pmproxy
              and all pmcd(1) instances (independent of which monitoring client is involved).

       If  set  to the value 1, the PMPROXY_LOCAL environment variable will cause pmproxy to run in a localhost-
       only mode of operation, where it binds only to the loopback interface.

       The PMPROXY_MAXPENDING variable can be set to indicate the maximum length to which the queue  of  pending
       client connections may grow.

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).

       For environment variables affecting PCP tools, see pmGetOptions(3).

SEE ALSO

       PCPIntro(1),   pmcd(1),  pmdbg(1),  pmlogger(1),  pmseries(1),  PMAPI(3),  PMWEBAPI(3),  pmGetOptions(3),
       pcp.conf(5) and pcp.env(5).