Docker and macvlan

Jonas Dahlgren Docker, networking

If you want to use docker containers in your regular LAN subnet you need to setup a new Docker network with macvlan driver.

First create your Docker network. — ip-range specifies all addresses that Docker will manage. Chose a part of your subnet outside your DHCP-scoop if you have one to avoid ip conflicts.
–aux-address=’host=192.168.6.4′ docker_net is tied to your host interface to allow your containers to comunicate with your host.

[root@docker01 ~]# docker network create -d macvlan -o parent=ens224 \
--subnet 192.168.6.0/24 \
--gateway 192.168.6.1 \
--ip-range 192.168.6.192/27 \
--aux-address='host=192.168.6.4' docker_net

As you can see when running docker network ls we have a new network called docker_net with macvlan driver.

Docker network

Next step is to create a macvlan interface, in this example called docker_int.
[root@docker01 ~]# ip addr add docker_int link ens224 type macvlan mode bridge

Configure the interface with your selected host address and bring it up. Last step is to add a IP route to tell your host how to connect to to al Docker containers.

[root@docker01 ~]# ip link add docker_int link ens224 type macvlan mode bridge
[root@docker01 ~]# ip link set docker-shim up
[root@docker01 ~]# ip route add 192.168.1.192/27 dev docker_int

Run a container and connect it to docker_net
[root@docker01 ~]# docker run nginx -network docker_net

If you want to check container ip run:

[root@docker01 ~]# docker inspect CONTAINER_ID

Invoke webrequest example

Jonas Dahlgren powershell

This example uses invoke-webrequest to retrieve computer information from a company reporting webpage. Only text inside TD elements are stored in a array for future use and added to a PSObject.

function Get-ComputerInfo
{
	[CmdletBinding()]
	param
(
		[parameter(
			 ValueFromPipeline = $true,
			 position = 0,
			 Mandatory = $true)]
	[string]$computername
)

	process
	{
		$Request = @{
			'domain'	  = 'domain1.company.net'
			'name'    = $computername
		}
		$lab = Invoke-WebRequest -Uri https://reporting.company.net/searchcomputer.php -Body $Request -Method Post

		$output = $lab.ParsedHtml.body.getElementsBytagname('TD') | select -expand innerhtml

		if ($output[7] -match '\D\d\d\d\d\d\d\d')
		{
			$user = Get-ADUser -Identity $output[7] | select -ExpandProperty name
		}
		else
		{
			$user = "Unknown"
			$output[7]= "Unknown"
		}

		$result = New-Object PSObject -Property @{
			Computername	    = $output[0];
			OU				    = $output[2];
			IP				    = $output[6];
			OS				    = $output[3];
			LastUser		    = $output[7];
			LastUSerFullName    = $user;
			LastSeen		    = $output[5];
			Master			    = $output[4];
		}
		Write-Output $result | select computername, ou, ip, os, master, lastuser, lastuserfullname, lastseen
	}#End Process
}

Migrate VMs between clusters with powecli

Jonas Dahlgren powercli, powershell

A short script to migrate VMs to a new cluster or host. Migrates one vm at a time to save network bandwith. After migration it upgrades Vmware tools to match current host version.

Takes a CSV file as input with VMs to migrate.

Param (
	[Parameter (Mandatory = $True)]
	$file
)
$vms = Import-Csv $file

foreach ($vm in $vms)
{
	Write-Host "Migrating VM" $vm.name
	Move-VM -VM $vm.name -Destination Cluster01
	Write-Host "Updating Vm-tools on " $vm.name
	Update-Tools -VM $vm.name -NoReboot
}

Create AD users from a CSV-file

Jonas Dahlgren Uncategorized

Here is an example of a script to create AD users from a CSV-file and assign a temoporary password.

param
(
	[parameter(Mandatory = $true)]
	$infile,
	$output
)

$OU = "OU=Users,DC=PSLABB,Dc=local"

$users = Import-Csv -Path $infile


foreach ($user in $users)
{
	$rand = Get-Random -Minimum 1000 -Maximum 9999
	$pwd = "Temp$rand"
	$name = "$($user.givenname)" + " " + $($user.surname)
	
	New-ADUser -Name $name -GivenName $user.Givenname -Surname $user.Surname -SamAccountName $user.username -user $user.username -Description "Tempuser" -path $ou -enabled $true -AccountPassword (convertTo-securestring -AsPlainText "Temp$rand" -Force)
	
	$details = @{
		'Name'= $name;
		'username'  = $($user.username);
		'Password'     = $pwd
	}
	$results = New-Object PSObject -Property $details
	$results | Export-Csv -Path $output -NoTypeInformation -Append
	
}

Fix VMware tools not running on Windows servers

Jonas Dahlgren powercli, powershell

I had some trouble with VMwaretools stopping on some machines and decided to automate restart och vmware tools. I wrote this script which takes a view parameter to view current status. If you start the script whitout the view parameter it will try to restart vmware tools.

fix-toolsnorunning.ps1

param
(
[parameter(Mandatory = $false)]
[switch]
$view
)

#Connect to Vcenter
$cred = Get-Credential
Connect-VIServer vcenter -Credential $cred | Out-Null

Write-Host -ForegroundColor Green "Collecting VMs"
$toolsvm=get-vm | where { $_.GuestId -like "*Windows*" -and $_.Extensiondata.Summary.Guest.ToolsStatus -like "toolsnotrunning" -and $_.Powerstate -eq "PoweredOn"}

#Stop script if no VMs reports tools not running
if ($toolsvm -eq $null)
{
Write-Host "Nothing to fix"
Disconnect-VIServer vcenter -Confirm:$false
exit
}

if ($view)
{
Write-Host "VMs whitout tools running"
foreach ($vm in $toolsvm)
{
Write-Host $vm
}
}
Else
{

foreach ($vm in $toolsvm)
{

if ($vm -match "^(?<Name>\S*)\s.*$") { $vm_name = $Matches.Name }
else { $vm_name = $vm }

$vm_hostname = $vm_name.name +".domain.local"

if (Test-Connection -Computername $vm_hostname -BufferSize 16 -Count 1 -Quiet)
{
Invoke-Command -Computername $vm_hostname -ScriptBlock { stop-Service -name vmvss; start-service vmvss } -Credential $cred
Write-Host "Service restarted on $vm_name"
}
Else
{
Write-Host -ForegroundColor Red "Unable to contact $vm_name"
}

}
}
#Disconnect from Vcenter.
Disconnect-VIServer vcenter -Confirm:$false

OP5 plugin example in powershell

Jonas Dahlgren OP5, Uncategorized

If you want to monitor your windows server uptime in OP5. Run from NSClient++ on all hosts you want to monitor uptime on.

param
(
	[parameter(Mandatory = $true)]
	[int]$w,
	[parameter(Mandatory = $true)]
	[int]$c
)
function Get-Uptime
{
	$os = Get-WmiObject win32_operatingsystem
	$uptime = (Get-Date) - ($os.ConvertToDateTime($os.lastbootuptime))
	return $Uptime
}
$os = Get-CimInstance Win32_OperatingSystem | Select-Object  Caption | ForEach{ $_.Caption }
$uptime = Get-Uptime

if ( $uptime.Days -gt $c)
{
	Write-Host Write-Host "CRITICAL Uptime:" $Uptime.Days "days"
	exit 2

}
if ($uptime.Days -gt $w)
{
	Write-Host Write-Host "WARNING Uptime:" $Uptime.Days "days"
	exit 1

}
if ($uptime.Days -lt $w)
{
	Write-Host "OK" $Uptime.Days "days uptime"
	Write-Host "OS: $os"
	exit 0
}