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Twelve Go Best Practices

Francesc Campoy Flores Gopher at Google @francesc http://campoy.cat/+

Best practices

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Services declared as oneshot are expected to take some action and exit immediatelly (thus, they are not really services, no running processes remain). A common pattern for these type of service is to be defined by a setup and a teardown action.

Let's create a example foo service that when started creates a file, and when stopped it deletes it.

Define setup/teardown actions

Create executable file /opt/foo/setup-foo.sh:

	# vi: ft=dosini
	[user]
	name = Pavan Kumar Sunkara
	email = [email protected]
	username = pksunkara
	[core]
	editor = nvim
	whitespace = fix,-indent-with-non-tab,trailing-space,cr-at-eol
	pager = delta
	[column]

	Copyright (c) 2015, Shahar Evron
	All rights reserved.

	Redistribution and use in source and binary forms, with or without modification,
	are permitted provided that the following conditions are met:

	1. Redistributions of source code must retain the above copyright notice, this
	list of conditions and the following disclaimer.

	2. Redistributions in binary form must reproduce the above copyright notice,

	[Unit]
	Description=Demonstrate Bash

	[Service]
	ExecStartPre=/usr/bin/bash -c "/usr/bin/systemctl set-environment MYVAR=$(( 2 + 2 ))"
	ExecStart=/usr/bin/echo "2 + 2 = ${MYVAR}"

	#!/usr/bin/env bash
	#
	# Get the value of a tag for a running EC2 instance.
	#
	# This can be useful within bootstrapping scripts ("user-data").
	#
	# Note the EC3 instance needs to have an IAM role that lets it read tags. The policy
	# JSON for this looks like:
	#
	# {

	# #####################################################################
	# DESC: Logstash configuration file. Typically forwarding logs to
	# Elasticsearch instance.
	# #####################################################################

	# Where to get input
	input {
	# Get input from standard input device/interface
	stdin {
	type => "stdin-type"

	# === Optimized my.cnf configuration for MySQL/MariaDB (on Ubuntu, CentOS, Almalinux etc. servers) ===
	#
	# by Fotis Evangelou, developer of Engintron (engintron.com)
	#
	# ~ Updated September 2024 ~
	#
	#
	# The settings provided below are a starting point for a 8-16 GB RAM server with 4-8 CPU cores.
	# If you have different resources available you should adjust accordingly to save CPU, RAM & disk I/O usage.
	#

	#@ /etc/quagga/bgpd.conf (Centos & Ubuntu)

	hostname <Local OS hostname>
	password <Any random phrase>
	enable password <Any random phrase>
	!
	log file /var/log/quagga/bgpd
	!debug bgp events
	!debug bgp zebra
	debug bgp updates