Grafana + Prometheus + Node_Exporter

node_exporter

#!/bin/sh

# PROVIDE: node_exporter
# REQUIRE: LOGIN
# KEYWORD: shutdown
#
# Add the following lines to /etc/rc.conf.local or /etc/rc.conf
# to enable this service:
#
# node_exporter_enable (bool):          Set to NO by default.
#               Set it to YES to enable node_exporter.
# node_exporter_user (string):          Set user that node_exporter will run under
#               Default is "nobody".
# node_exporter_group (string):         Set group that node_exporter will run under
#               Default is "nobody".
# node_exporter_args (string):          Set extra arguments to pass to node_exporter
#               Default is "".
# node_exporter_listen_address (string):Set ip:port that node_exporter will listen on
#               Default is ":9100".
# node_exporter_textfile_dir (string):  Set directory that node_exporter will watch
#               Default is "/var/tmp/node_exporter".

. /etc/rc.subr

name=node_exporter
rcvar=node_exporter_enable

load_rc_config $name

: ${node_exporter_enable:="NO"}
: ${node_exporter_user:="nobody"}
: ${node_exporter_group:="nobody"}
: ${node_exporter_args:=""}
: ${node_exporter_listen_address:=":9100"}
: ${node_exporter_textfile_dir:="/var/tmp/node_exporter"}


pidfile=/var/run/node_exporter.pid
command="/usr/sbin/daemon"
procname="/usr/local/bin/node_exporter"
command_args="-p ${pidfile} -T ${name} \
    /usr/bin/env ${procname} \
    --web.listen-address=${node_exporter_listen_address} \
    --collector.textfile.directory=${node_exporter_textfile_dir} \
    ${node_exporter_args}"

start_precmd=node_exporter_startprecmd

node_exporter_startprecmd()
{
    if [ ! -e ${pidfile} ]; then
        install \
            -o ${node_exporter_user} \
            -g ${node_exporter_group} \
            /dev/null ${pidfile};
    fi
    if [ ! -d ${node_exporter_textfile_dir} ]; then
        install \
            -d \
            -o ${node_exporter_user} \
            -g ${node_exporter_group} \
            -m 1755 \
            ${node_exporter_textfile_dir}
    fi
}

load_rc_config $name
run_rc_command "$1"

prometheus

#!/bin/sh

# PROVIDE: prometheus
# REQUIRE: LOGIN
# KEYWORD: shutdown
#
# Add the following lines to /etc/rc.conf.local or /etc/rc.conf
# to enable this service:
#
# prometheus_enable (bool)
#     Set to NO by default
#     Set it to YES to enable prometheus
# prometheus_user (string)
#     Set user to run prometheus
#     Default is "prometheus"
# prometheus_group (string)
#     Set group to run prometheus
#     Default is "prometheus"
# prometheus_data_dir (string)
#     Set dir to run prometheus in
#     Default is "/var/db/prometheus"
# prometheus_consoles (string)
#     Set dir that contains Prometheus consoles
#     Default is "/usr/local/share/prometheus/consoles"
# prometheus_console_libraries (string)
#     Set dir containing Prometheus console libraries
#     Default is "/usr/local/share/prometheus/console_libraries"
# prometheus_args (string)
#     Set additional command line arguments
#     Default is ""

. /etc/rc.subr

name=prometheus
rcvar=prometheus_enable

load_rc_config $name

: ${prometheus_enable:="NO"}
: ${prometheus_user:="prometheus"}
: ${prometheus_group:="prometheus"}
: ${prometheus_config:="/usr/local/etc/prometheus.yml"}
: ${prometheus_data_dir:="/var/db/prometheus"}
: ${prometheus_consoles_dir:="/usr/local/share/prometheus/consoles"}
: ${prometheus_console_libraries_dir:="/usr/local/share/prometheus/console_libraries"}
: ${prometheus_args:=""}

pidfile="/var/run/${name}.pid"
required_files="${prometheus_config}"
command="/usr/sbin/daemon"
procname="/usr/local/bin/${name}"
sig_reload="HUP"
extra_commands="reload"
command_args="-p ${pidfile} -m 3 -T ${name} \
                /usr/bin/env ${procname} \
                --config.file=${prometheus_config} \
                --storage.tsdb.path=${prometheus_data_dir} \
                --web.console.templates=${prometheus_consoles_dir} \
                --web.console.libraries=${prometheus_console_libraries_dir} \
                ${prometheus_args}"

start_precmd=prometheus_startprecmd

# This checks for the existence of a prometheus 1.x data dir at the
# $prometheus_data_dir location. If one is found, Prometheus will not start.
prometheus_check_data_dir_version()
{
    local data_dir_version_file="${prometheus_data_dir}/VERSION"

    if [ -f "${data_dir_version_file}" ]; then
        local data_dir_version="0"

        read data_dir_version < "${data_dir_version_file}"

        if [ "${data_dir_version}" = "1" ]; then
            return 1
        fi
    fi
}

prometheus_startprecmd()
{
    if [ ! -e ${pidfile} ]; then
        install \
            -o ${prometheus_user} \
            -g ${prometheus_group} \
            /dev/null ${pidfile};
    fi
    if [ ! -d ${prometheus_data_dir} ]; then
        install \
            -d \
            -o ${prometheus_user} \
            -g ${prometheus_group} \
            -m 750 \
            ${prometheus_data_dir}
    else
        # The directory already existed. Ensure it's not a prometheus 1.x
        # data dir.
        if ! prometheus_check_data_dir_version; then
            err 1 "Found net-mgmt/prometheus1 data dir, refusing to start."
        fi
    fi
}

load_rc_config $name
run_rc_command "$1"