added services intro

01 Getting Started.md

@@ -4,10 +4,10 @@
 In this worksheet you will be shown how to setup and configure a raspberry pi as a central 'hub' for your home automation system. By the end of this you will have:
 
 1. The operating system (Debian Stretch Lite) installed on the hub.
-2. The I2C interface configured for use (and a small display attached).
-3. A working MQTT broker installed (but not fully secured!).
-4. The latest versions of Python and Pip.
-5. A NodeJS runtime environment for running scripts. We will then use this to publish a simple API.
+2. The wireless interface configured to connect to the Internet.
+3. The ability to connect securely over SSH from a remote computer without entering a password.
+4. Changed the host name of the computer
+5. Changed the password on the default user account.
 
 ## 1 Installing the Operating System
 

Managing Services.md

@@ -0,0 +1,63 @@
+
+# Managing Services
+
+A lot of the software you will be installing, such as [MySQL](https://www.mysql.com) will need to run as background services. This tutorial will guide you through how to install and manage background services.
+
+## 1 System D
+
+https://www.linuxjournal.com/content/initializing-and-managing-services-linux-past-present-and-future
+
+### 1.1 Installing Neo4J
+
+In this section you will be shown how to install and run a Neo4J instance using SystemV.
+
+## 2 Docker
+
+You can use the [Docker Playground](https://labs.play-with-docker.com) to learn how to work with Docker.
+
+## 3 Homebrew (MacOS Only)
+
+Until now all the tools and techniques covered work on the Raspberry Pi or indeed any computer running a [Debian](https://www.debian.org) based [Linux](https://www.linux.org) distribution (such as [Ubuntu](https://ubuntu.com) or [Raspberian](https://www.raspbian.org)). If you are using a [Mac](https://www.apple.com/uk/mac) (and [MacOS](https://www.apple.com/uk/macos)) for your development work you should make use of the [Homebrew](https://brew.sh) package manager which provides commands to install, uninstall, update and run a wide range of software packages.
+
+### 3.1 Installation
+
+The installation instructions can be found on the main [website](https://brew.sh), in summary you need to run the following in the terminal app which uses the [Ruby](https://www.ruby-lang.org/en/) language:
+
+```shell
+/usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
+```
+
+### 3.2 Installing Packages
+
+Once Homebrew has been installed you can use it in the terminal to install a wide range of software, for example to install MySQL:
+
+1. Search for the software on the [Homebrew website](https://formulae.brew.sh/formula/mysql). This tells you the correct software name, in this case it is `mysql`.
+2. Now we can install the software using `brew install mysql`.
+
+### 3.3 Starting and Stopping Services
+
+Many of the software packages run as background services and we need to be able to start, stop and restart these. The easiest way is to install the [Homebrew Services](https://github.com/Homebrew/homebrew-services) using `brew tap homebrew/services` command. The `tap` subcommand allows you to access other repositories that are not included in Homebrew's master repository.
+
+Once the services are installed you can list the installed services and see if they are running using the following command:
+
+```shell
+$ brew services list
+  Name      Status  User Plist
+  mosquitto stopped
+  mysql     stopped
+  neo4j     stopped
+```
+
+Now we can start and stop the services:
+
+```shell
+$ brew services start mysql
+  ==> Successfully started `mysql` (label: homebrew.mxcl.mysql)
+$ brew services restart mysql
+  Stopping `mysql`... (might take a while)
+  ==> Successfully stopped `mysql` (label: homebrew.mxcl.mysql)
+  ==> Successfully started `mysql` (label: homebrew.mxcl.mysql)
+$ brew services stop mysql
+  Stopping `mysql`... (might take a while)
+  ==> Successfully stopped `mysql` (label: homebrew.mxcl.mysql)
+```