Add DSC demo. Bugfix Apache and SystemD demo. (#1814)

* Add DSC demo. Bugfix Apache and SystemD demo.

* DSC, Apache, SystemD demos, address comments

* Fix capitalization in apache-demo.ps1

demos/DSC/dsc-demo.ps1

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+
+#Get Distro type and set distro-specific variables
+$OSname = Get-Content "/etc/os-release" |Select-String -Pattern "^Name=" 
+$OSName = $OSName.tostring().split("=")[1].Replace('"','')
+if ($OSName -like "Ubuntu*"){
+    $distro = "Ubuntu"
+    $ApachePackages = @("apache2","php5","libapache2-mod-php5")
+    $ServiceName = "apache2"
+    $VHostDir = "/etc/apache2/sites-enabled"
+    $PackageManager = "apt"
+}elseif (($OSName -like "CentOS*") -or ($OSName -like "Red Hat*") -or ($OSname -like "Oracle*")){
+    $distro = "Fedora"
+    $ApachePackages = @("httpd","mod_ssl","php","php-mysql")
+    $ServiceName = "httpd"
+    $VHostDir = "/etc/httpd/conf.d"
+    $PackageManager = "yum"
+}else{
+    Write-Error "Unknown Linux operating system. Cannot continue."
+}
+
+#Get Service Controller
+if ((Test-Path "/bin/systemctl") -or (Test-Path "/usr/bin/systemctl")){
+    $ServiceCtl = "SystemD"
+}else{
+    $ServiceCtl = "init"
+}
+
+#Get FQDN
+$hostname = & hostname --fqdn
+
+Write-Host -ForegroundColor Blue "Compile a DSC MOF for the Apache Server configuration"
+Configuration ApacheServer{
+    Node localhost{
+
+        ForEach ($Package in $ApachePackages){
+            nxPackage $Package{
+                Ensure = "Present"
+                Name = $Package
+                PackageManager = $PackageManager
+            }
+        }
+
+        nxFile vHostDirectory{
+            DestinationPath = $VhostDir
+            Type = "Directory"
+            Ensure = "Present"
+            Owner = "root"
+            Mode = "744"
+        }
+
+        #Ensure default content does not exist
+        nxFile DefVHost{
+            DestinationPath = "${VhostDir}/000-default.conf"
+            Ensure = "Absent"
+        }
+
+        nxFile Welcome.conf{
+            DestinationPath = "${VhostDir}/welcome.conf"
+            Ensure = "Absent"            
+        }
+
+        nxFile UserDir.conf{
+            DestinationPath = "${VhostDir}/userdir.conf"
+            Ensure = "Absent"            
+        }
+
+        #Ensure website is defined
+        nxFile DefaultSiteDir{
+            DestinationPath = "/var/www/html/defaultsite"
+            Type = "Directory"
+            Owner = "root"
+            Mode = "744"
+            Ensure = "Present"
+        }
+
+        nxFile DefaultSite.conf{
+            Destinationpath = "${VhostDir}/defaultsite.conf"
+            Owner = "root"
+            Mode = "744"
+            Ensure = "Present"
+            Contents = @"
+<VirtualHost *:80>
+DocumentRoot /var/www/html/defaultsite
+ServerName $hostname
+</VirtualHost>
+
+"@
+            DependsOn = "[nxFile]DefaultSiteDir"
+        }
+
+        nxFile TestPhp{
+            DestinationPath = "/var/www/html/defaultsite/test.php"
+            Ensure = "Present"
+            Owner = "root"
+            Mode = "744"
+            Contents = @'
+<?php phpinfo(); ?>
+
+'@
+        }
+
+        #Configure Apache Service
+        nxService ApacheService{
+            Name = "$ServiceName"
+            Enabled = $true
+            State = "running"
+            Controller = $ServiceCtl
+            DependsOn = "[nxFile]DefaultSite.conf"
+        }
+    
+    } 
+}
+
+ApacheServer -OutputPath "/tmp"
+
+Pause
+Write-Host -ForegroundColor Blue "Apply the configuration locally"
+& sudo /opt/microsoft/dsc/Scripts/StartDscConfiguration.py -configurationmof /tmp/localhost.mof | Out-Host
+
+Pause
+Write-Host -ForegroundColor Blue "Get the current configuration"
+& sudo /opt/microsoft/dsc/Scripts/GetDscConfiguration.py | Out-Host

demos/DSC/readme.md

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+## DSC MOF Compilation Demo
+
+[PowerShell Desired State Configuration](https://msdn.microsoft.com/en-us/PowerShell/dsc/overview) is a declarative configuration platform for Windows and Linux. DSC configurations can be authored in PowerShell and compiled into the resultant MOF document. 
+
+This demo shows use of PowerShell to author a DSC configuration to set the configuration of an Apache web server. PowerShell scripting is used to assess distro and version-specific properties, such as the service controller and repo manager tools, for use in the configuration. 
+
+## Prerequisites ##
+- PowerShell >= 6.0.0-alpha.8 [https://github.com/PowerShell/PowerShell/releases](https://github.com/PowerShell/PowerShell/releases)
+- OMI: >= 1.1.0  [https://www.github.com/microsoft/omi/releases](https://www.github.com/microsoft/omi/releases)
+- Desired State Configuration for Linux >= 1.1.1-278 [https://github.com/Microsoft/PowerShell-DSC-for-Linux/releases](https://github.com/Microsoft/PowerShell-DSC-for-Linux/releases)
+
+Note: applying the DSC configuration requires privileges. The user must have sudo authorization capabilities. You will be prompted for a sudo password when running the demo.