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
}