第3章 Installing PCP Packages

Procedure

1. To configure PCP to collect data about Satellite processes, create the /var/lib/pcp/pmdas/proc/hotproc.conf file and include the following content:

   #pmdahotproc
   Version 1.0
   
   # processes with load 0.9 or 1GB RSS memory
   (cpuburn > 0.9 || residentsize > 1000000) &&
   (
     fname == "java" ||
     fname == "qdrouterd" ||
     fname == "qpidd" ||
     (fname == "postgres" && psargs ~ /-D/) ||
     fname == "mongod" ||
     fname == "dynflow_executor" ||
     fname == "dynflow_executor_monitor" ||
     fname ~ /smart_proxy_dynflow_core/ ||
     psargs ~ /Passenger RackApp/ ||
     psargs ~ /celery beat/ ||
     psargs ~ /celery worker/ ||
     psargs ~ /pulp/ ||
     psargs ~ /smart-proxy/ ||
     psargs ~ /squid.conf/
   )

   By default, PCP collects basic system metrics. This step enables detailed metrics about the following Satellite processes:

   • Java
   • PostgreSQL
   • MongoDB
   • Dynflow
   • Passenger
   • Pulp
   • Qpid

2. Configure PCP to log the process metrics being collected.

   # mkdir -p /var/lib/pcp/config/pmlogconf/foreman-hotproc
   # cat >/var/lib/pcp/config/pmlogconf/foreman-hotproc/summary << EOF
   #pmlogconf-setup 2.0
   ident   foreman hotproc metrics
   probe   hotproc.control.config != "" ? include : exclude
           hotproc.psinfo.psargs
           hotproc.psinfo.cnswap
           hotproc.psinfo.nswap
           hotproc.psinfo.rss
           hotproc.psinfo.vsize
           hotproc.psinfo.cstime
           hotproc.psinfo.cutime
           hotproc.psinfo.stime
           hotproc.psinfo.utime
           hotproc.io.write_bytes
           hotproc.io.read_bytes
           hotproc.schedstat.cpu_time
           hotproc.fd.count
   EOF

3. Install the process monitoring PMDA.

   # cd /var/lib/pcp/pmdas/proc
   # ./Install

4. Configure PCP to collect metrics from Apache HTTP Server.

   1. Enable the Apache HTTP Server extended status module.

      #cat >/etc/httpd/conf.d/01-status.conf <<EOF
      ExtendedStatus On
      LoadModule status_module modules/mod_status.so
      
      <Location "/server-status">
      PassengerEnabled off
      SetHandler server-status
      Order deny,allow
      Deny from all
      Allow from localhost
      </Location>
      EOF

   2. Enable the Apache HTTP Server PMDA.

      # cd /var/lib/pcp/pmdas/apache
      # ./Install

   3. Prevent the Satellite installer overwriting the extended status module’s configuration file.

      Add the following line to the /etc/foreman-installer/custom-hiera.yaml configuration file.

      apache::purge_configs: false

5. Configure PCP to collect metrics from PostgreSQL.

   1. Change to the /var/lib/pcp/pmdas/postgresql directory.

      # cd /var/lib/pcp/pmdas/postgresql

   2. Run the installer.

      # ./Install

   3. Configure the PCP database interface to permit access to the PostgreSQL database.

      Edit the /etc/pcpdbi.conf configuration file, inserting the following lines:

      $database = "dbi:Pg:dbname=foreman;host=localhost";
      $username = "foreman";
      $password = "6qXfN9m5nii5iEcbz8nuiJBNsyjjdRHA"; 1
      $os_user = "foreman";

      1

      The value for $password is stored in /etc/foreman/database.yml configuration file.

   4. Change the SELinux pcp_pmcd_t domain permission to permit PCP access to the PostgreSQL database.

      # semanage permissive -a pcp_pmcd_t

   5. Verify the PostgreSQL PMDA is able to connect to PostgreSQL.

      Examine the /var/log/pcp/pmcd/postgresql.log file to confirm the connection is established. Without a successful database connection, the PostgreSQL PMDA will remain active, but not be able to provide any metrics.

      [Tue Aug 14 09:21:06] pmdapostgresql(25056) Info: PostgreSQL connection established

      If you find errors in /var/log/pcp/pmcd/postgresql.log, restart the pmcd service.

      # systemctl restart pmcd

6. Enable telemetry functionality in Satellite.

   To enable collection of metrics from Satellite, you must send metrics via the statsd protocol into the pcp-mmvstatsd daemon. The metrics are aggregated and available via the PCP MMV API.

   1. Install the Foreman Telemetry and pcp-mmvstatsd packages.

      # satellite-maintain packages install foreman-telemetry pcp-mmvstatsd

   2. Enable and start the pcp-mmvstatsd service.

      # systemctl enable pcp-mmvstatsd
      # systemctl start pcp-mmvstatsd

   3. Enable the Satellite telemetry functionality.

      Add the following lines to /etc/foreman/settings.yaml configuration file:

      :telemetry:
        :prefix: 'fm_rails'
        :statsd:
          :enabled: true
          :host: '127.0.0.1:8125'
          :protocol: 'statsd'
        :prometheus:
          :enabled: false
        :logger:
          :enabled: false
          :level: 'INFO'

7. Schedule daily storage of metrics in archive files:

   # cat >/etc/cron.daily/refresh_mmv <<EOF
   #!/bin/bash
   echo "log mandatory on 1 minute mmv" | /usr/bin/pmlc -P
   EOF
   # chmod +x /etc/cron.daily/refresh_mmv

8. Restart the Apache HTTP Server and PCP to begin data collection:

   # systemctl restart httpd pmcd pmlogger