fullmetal.science

Vadim Zeland - TransSurfing [German]

2025-11-26T00:00:00+00:00

Have reality cease to exist as something external and independent, and let it become manageable.

HAProxy configuration to load-balance Monero nodes

2024-06-03T00:00:00+00:00

To get an understanding of HAProxy’s possibilities, I grabbed a list of nodes from monero.fail and created a configuration that load-balances connections among them.

The configuration would allow you to connect Monero to HAProxy, which in turn takes care of selecting a remote node that responds fairly quickly.

However, using HAProxy makes more sense in a scenario where you want to load balance multiple public nodes that you operate yourself.

Note that there’s also a project named Monerod-Proxy that offers similar functionality.

# HAProxy configuration file (stand-alone)
# to load-balance among a list of public Monero nodes
# /etc/haproxy/haproxy.cfg

global
  chroot /var/lib/haproxy
  user haproxy
  group haproxy
  # Enable to access information via socket file 
  # See https://www.haproxy.com/blog/haproxy-apis
  #stats socket /var/run/haproxy.sock mode 0600 level admin expose-fd listeners thread 1

defaults
  mode tcp
  # https://www.haproxy.com/blog/the-four-essential-sections-of-an-haproxy-configuration#timeout-connect-timeout-client-timeout-server
  timeout client  60s
  timeout connect  5s
  timeout server  60s

## Enable a status page at the given port
#frontend stats
#  mode http
#  bind *:8404
#  stats enable
#  stats uri /stats
#  #stats refresh 10s
#  stats admin if LOCALHOST

# Have HAProxy listen for clients on the defined port
frontend frontend
  bind :18081
  default_backend nodes

# Have HAProxy forward connections to this list of nodes
backend nodes
  # Approach the list of nodes least connected to in a roundrobin manner
  balance leastconn
  # https://www.haproxy.com/documentation/haproxy-configuration-tutorials/service-reliability/health-checks/#passive-health-checks
  # https://www.haproxy.com/blog/how-to-enable-health-checks-in-haproxy#passive-health-checks
  #
  # "Passive health checks always coexist with active health checks, with the latter
  # doing its normal polling while also being responsible for reviving a server after
  # it has been marked as down by a passive health check."
  # 
  # Active part:  Nodes will be checked every 10 minutes (inter), considered
  #               "down" if connection fails once (fall 1) and "up" if available
  #               upon the 2 further cheks (rise 2).
  # Passive part: Nodes will be considered "down" if there are at least two
  #               errors in ongoing connections (observe - error-limit 2).
  #               Only an active check (explained above) can return it to "up".
  default-server  check  inter 10m  observe layer4  error-limit 2  on-error mark-down  fall 1  rise 2
  server backend-1 node.moneroworld.com:18089
  server backend-2 uwillrunanodesoon.moneroworld.com:18089
  server backend-3 nodes.hashvault.pro:18081
  server backend-4 node1.xmr-tw.org:18081
  server backend-8 xmr-de-1.boldsuck.org:18081
  # ...

You may append as many nodes as you want, but be aware that each one implies more health checks and slows down HAProxy-startup.

Once HAProxy is running (haproxy -W -f <path-to-config>) you can test the connection with Monero RPC or CLI (monero-wallet-cli --daemon-host <haproxy-ip> --daemon-port 18081 <further-options>).

The configuration surely has room for improvement. If you know any tweaks, please comment in our thread on Monero Town.

Understanding the Common Law

2024-01-27T00:00:00+00:00

Prof. Richard Epstein presents the logical reasoning of Common Law in a concise manner.

The Occult Art of Law

2024-01-08T00:00:00+00:00

Alan of Salisbury unveils the workings of black word-magic used to trick unsuspecting individuals into consenting to subjugation.

For full context it’s highly recommended to watch the original piece in its entirety.

Breath - The New Science of a Lost Art

2022-09-29T00:00:00+00:00

James Nestor discovers the principles of boosting health through breath: Shut up, exhale, chew and hold it.

Key-Setting Wrench “Umstellaktivator” for LaGard 3330/3390

2022-02-28T00:00:00+00:00

This wrench models a tool required to change the combination on LaGard 3330/3390 locks typically used in safes.

Use this model as reference for crafting your own tool from a steel rod or allen wrench.

IMPORTANT: The torque required when using the tool exceeds the tensile strength of most 3D-printed filaments. Abstain from using a printed version in an actual lock to avoid the risk of the lock becoming unusable.

You can find the source files at https://gitlab.com/fullmetalScience/printables and use OpenSCAD to interpret and convert them to STL or download the necessary STL’s directly from the Key-Setting Wrench ‘Umstellaktivator’ for LaGard 3330/3390 Thingiverse page.

Bhikkhu Bodhi - The Noble Eightfold Path

2021-12-13T00:00:00+00:00

Reach a proper understanding of the Noble Eightfold Path, the way to the end of suffering.

Mark Passio - The Sacred Gift of Anger

2021-12-07T00:00:00+00:00

Mark Passio clarifies the value of anger, the one most-shunned emotion by current societies.

English original followed by German translation;

Shooting In Stressful Situations

2021-10-20T00:00:00+00:00

Paul Harrel emphasizes how only repetition with added challenges can take you from “taught” to “trained”.

English original followed by German translation;

Mark Passio - Fake Ass Christians - Full Presentation

2021-05-31T00:00:00+00:00

A couple of minutes worth reading cannot possibly replace several hours of information, but they might confuse you just enough to start asking the right questions.

English original followed by German translation;