Tinker

Overview

This machine has put Keres out of service.

TrueNas VM

Hardware

• Virtual CPUs: 1
• Cores: 1
• Threads: 1
• Memory Size: 1.00 GiB
• System Clock: LOCAL
• Com Port: /dev/nmdm1B

Services / Apps

• #Grafana
• #Prometheus
• #Promethes mDNS discovery

Prometheus mDNS discovery

Reference:

https://github.com/msiebuhr/prometheus-mdns-sd

Compiled, then copied the binary to the prometheus /usr/local/prometheus-X/ dir.

Created service:

file: /etc/systemd/system/prometheus-mdns.service

[Unit]
Description=mDNS Discovery for Prometheus
Documentation=https://github.com/msiebuhr/prometheus-mdns-sd
After=network-online.target

[Service]
User=prometheus
Group=prometheus
Restart=on-failure
ExecStart=/usr/local/prometheus-2.40.3.linux-amd64/prometheus-mdns-sd -out /usr/local/prometheus-2.40.3.linux-amd64/mdns-sd.json

[Install]
WantedBy=multi-user.target

Grafana

to do https://grafana.com/docs/grafana/latest/installation

Prometheus Setup

by hand in a screen, ghetto style

/usr/local/prometheus/prometheus-2.14.0.linux-amd64

./prometheus

# my global config
global:
  scrape_interval:     1m # Set the scrape interval to every 15 seconds. Default is every 1 minute.
  evaluation_interval: 1m # Evaluate rules every 15 seconds. The default is every 1 minute.
  # scrape_timeout is set to the global default (10s).

# Alertmanager configuration
alerting:
  alertmanagers:
  - static_configs:
    - targets:
      # - alertmanager:9093

# Load rules once and periodically evaluate them according to the global 'evaluation_interval'.
rule_files:
  # - "first_rules.yml"
  # - "second_rules.yml"

# A scrape configuration containing exactly one endpoint to scrape:
# Here it's Prometheus itself.
scrape_configs:
  # The job name is added as a label `job=<job_name>` to any timeseries scraped from this config.
  - job_name: 'prometheus'
    static_configs:
    - targets: ['localhost:9090']
      labels:
        name: keres
  - job_name: 'pi-htu21d'
    static_configs:
    # - targets: ['192.168.1.113:8000']
    - targets: ['10.23.45.6:8000']
      labels:
        name: pi
        device: htu21d
  - job_name: 'pi-node-exporter'
    static_configs:
    - targets: ['10.3.45.6:9100']
      labels:
        name: pi
  - job_name: 'thelaptop'
    static_configs:
    - targets: ['192.168.1.120:9100']
      labels:
        name: thelaptop

MineCraft Setup

manual DL of binary jar

by hand:

/data/minecraft_server.1.15.2

run.sh

#!/bin/sh
java -Xmx1024M -Xms1024M -jar minecraft_server.1.15.2.java nogui

Todo

• Harden
• firewalld - kicked out , not good logging features, so now have iptables back in and firewalld disabled.
• Wifi - none - disabled for now.
• snmp
• powertop tuning
• systemd bootchart.conf(5)

• services

Service	Software	process	status	notes
firewall	iptables	n/a	DONE	not using firewalld due to lack of default deny log.
web	apache	httpd	DONE
ntp	chrony	chronyd	DONE
monitoring	misc	n/a	PENDING	still looking at optins, possibly ganglia / collectd / statsd
sql	mariadb	mysqld	DONE	and backups done.
dns	isc bind	named	DONE	really need to try something new here.

• Smokeping

athena -> keres data sync

time /usr/bin/rsync -avzr /etc/ /mnt/keres/data/athena/etc --stats
time /usr/bin/rsync -avzr /var/bind/ /mnt/keres/data/athena/var/bind --stats

Interfaces

ip link set  wlp2s0 down

Firewall

ports and services

22
80
8080 
8443
443






See Also
* /lshw
* /lspci
* Ubuntu