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Create and join the docker group.

$ sudo addgroup --system docker
$ sudo adduser $USER docker
$ newgrp docker

You will also need to disable and re-enable the docker snap if you added the group while it was running.

$ sudo snap disable docker
$ sudo snap enable docker

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Using OTP's observer (appmon replacement) remotely

$ ssh remote-host "epmd -names"
epmd: up and running on port 4369 with data:
name some_node at port 58769

Note the running on port for epmd itself and the port of the node you're interested in debugging. Reconnect to the remote host with these ports forwarded:

$ ssh -L 4369:localhost:4369 -L 58769:localhost:58769 remote-host

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How to make a debian from a ROS package

The instructions are based on this answers.ros.org thread.

Get dependencies

You may need the latest pip, follow the official instructions.

Install bloom:

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(define (delete-n list n)
  (if (= n 0)
      (cdr list)
      (cons (car list) (delete-n (cdr list) (- n 1)))))

(define (insert-n list item n)
  (if (= n 0)
      (cons item list)
      (cons (car list) (insert-n (cdr list) item (- n 1)))))

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#lang racket/base

; One way to define a logger
(define lg (make-logger 'my-logger))
; Define a receiver for this logger, along with a log level
(define rc (make-log-receiver lg 'error)) ; also try with 'debug

; Another way to define a logger, with additional forms
(define-logger lg2)
(define rc2 (make-log-receiver lg2-logger 'debug))

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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE KeyboardMappingScheme>
<!-- Written by Qt Creator 4.2.1, 2017-03-27T21:24:06. -->
<mapping>
 <shortcut id="CppTools.OpenHeaderSourceInNextSplit">
  <key value="Ctrl+E, F4"/>
 </shortcut>
 <shortcut id="CppTools.SwitchHeaderSource">
  <key value="F4"/>
 </shortcut>

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Ubuntu 18.04 / 18.10 Ruby and Elixir Development Setup

Guide to setting up a new Ubuntu 18.04 dev environment with Ruby and Elixir installed with the asdf version management tool.

Update system and install prerequisite packages

Some of these packages may already be installed

sudo apt-get install make binutils gcc build-essential \
 git curl zlib1g-dev openssl libssl-dev libreadline-dev \

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##
## LeoFS' Erlang
##
FROM gliderlabs/alpine:3.4

MAINTAINER LeoFS <leo-project.net/leofs/>

ENV LANG=en_US.UTF-8 \
    HOME=/var/local/erlang/ \
    TERM=xterm

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#!/bin/sh

## 
sed -i -e 's/\(us.\)\?archive.ubuntu.com/ftp.daumkakao.com/g' -e 's/security.ubuntu.com/ftp.daumkakao.com/g' /etc/apt/sources.list

## check
apt update

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ifdef::env-github[]
:tip-caption: :bulb:
:note-caption: :information_source:
:important-caption: :heavy_exclamation_mark:
:caution-caption: :fire:
:warning-caption: :warning:
endif::[]

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