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(from : https://simplifiedthinking.co.uk/2015/10/03/install-mqtt-server/ )

Installing Brew

The Mosquitto MQTT Server can be easily installed using Homebrew.  If it’s not installed on your system already, then a quick visit to the homepage will give you all you need to get going.  Homebrew is an OS X Package Manager for installing and updating non-Mac OS X utilities that are more commonly found in other variants of Linux.  To install the basic package manager run the following command.

ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"

Installing Mosquitto MQTT

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package main

 
import "encoding/json"
import "fmt"

 
type Person struct {
    Name string   `json:"name"`

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# when you try to start docker 
# sudo systemctl start docker
# and the output is: Failed to start docker.service: Unit docker.service is masked.
# 
# 
# ls -la /etc/systemd/system | grep docker
# see for /dev/null if there is
systemctl unmask docker.service 
systemctl unmask docker.socket 
systemctl start docker.service 

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# when you try to start docker 
# sudo systemctl start docker
# and the output is: Failed to start docker.service: Unit docker.service is masked.
# 
# 
# ls -la /etc/systemd/system | grep docker
# see for /dev/null if there is
systemctl unmask docker.service 
systemctl unmask docker.socket 
systemctl start docker.service 

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package main

import (
	"context"
	"log"
	"net/http"
	"time"

	"github.com/gin-gonic/gin"
)

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FROM golang:1.23.0-bookworm AS build

ARG upx_version=4.2.4

RUN apt-get update && apt-get install -y --no-install-recommends xz-utils && \
  curl -Ls https://github.com/upx/upx/releases/download/v${upx_version}/upx-${upx_version}-amd64_linux.tar.xz -o - | tar xvJf - -C /tmp && \
  cp /tmp/upx-${upx_version}-amd64_linux/upx /usr/local/bin/ && \
  chmod +x /usr/local/bin/upx && \
  apt-get remove -y xz-utils && \
  rm -rf /var/lib/apt/lists/*