Allgemein

Windows uninstall nonpresent devices…

When you want to rename a network adapter and you go “Cannot rename this connection. A connection with the name you specified already exists. Specify a different name.” You get this message for examle exwhen you changed the network card and you want to change the name of the new one to the same name the old one had.

Solution is to remove the old unused network adapter:

1.Click Start, click Run, type cmd.exe, and then press ENTER.
2.Type set devmgr_show_nonpresent_devices=1, and then press ENTER.
3.Type Start DEVMGMT.MSC, and then press ENTER.
4.Click View, and then click Show Hidden Devices.
5.Expand the Network Adapters tree.
6.Right-click the dimmed network adapter, and then click Uninstall

Virtualization

Nested Virtualization/Hypervisor ESXi => HyperV….

To run HyperV in ESXi modify the vmx file of the HyperV guest vm:

vhv.enable = "TRUE"
hypervisor.cpuid.v0 = "FALSE"

To allow network communication from VMs on the HyperV over the HyperV virtual switches to the ESXi network the “Promiscuous Mode” of the ESXi network switch has to be set to “Accept” – ESXi-Host => configuration => networking => select vSwitch<X> => properties => select vSwitch => Edit => Security => Policy Exceptions => Promiscuous Mode => Accept

 

Allgemein

Windows VPN connection with local default gateway…

 

 

If you have created a VPN connection then as default the network configuration will be changed so that the gateway is set to the remote network. Then you will not be able to access the local network and also you will not have access to the local internet.

This can be changed by removing the setting “Use default gateway on remote network”:vpn-gateway

Oracle, Solaris

Oracle 11gR2 Solaris DBConsole did not start…

On my machine the dbconsole didn’t start.

The problem was the timezone didn’t match the timezone of the machine/host.

$ORACLE_HOME/solaris_DB/sysman/config$ vi emd.properties

agentTZRegion=+02:00

===============================================================

how to recreate DBConsole & repository:

export ORACLE_UNQNAME = XXX

emca -deconfig dbcontrol db -repos drop

emca -repos create

emca -config dbcontrol db

Allgemein, WinCC OA

WinCC OA Android App…

I now also built an Android App to visualize my Home-Automation data (powered by WinCC OA – www.etm.at).

Because i did the same for iOS and used C# for coding (Xamarin Framework) i was able to share about 70% of the code between both Apps (iOS and Android). So there was no need to re-implement the communication and business logic!! All i had to do is to get familiar with the Android-UI…

App: http://www.rocworks.at/wordpress/rocvmobile/

Android-App:

2013-09-23 12.55.05 Screenshot_2013-09-23-16-26-26 2013-09-22 07.09.00 test1 Screenshot_2013-09-22-14-09-48

 

Oracle, Solaris

Solaris ZFS snapshot to save machine state…

Very nice feature of solaris is to use a zfs snapshots to protect the current state/configuration of a machine.

And it is very easy to use, all we have to do is:

> beadm list
BE Active Mountpoint Space Policy Created
-- ------ ---------- ----- ------ -------
solaris NR / 11.23G static 2013-07-04 16:45
solaris-backup-1 - - 155.0K static 2013-07-04 17:28

After the installation of solaris a snapshot was already created automatically.

After installation and configuration of various software we can create a new snapshot:

beadm create -e solaris solaris-backup-2

If something bad will happen afterwards we can just simple select the backup at the boot manager! and then activate our backup as the active snapshot:

beadm activate solaris-backup-2

I think the old/bad snapshot/base can be deleted afterwards, but i didn’t yet tried that, maybe it is a good idea to create a base snapshot and working snapshot, and set the working snapshot as the active one, so in the case of an error we can create a new snapshot based on the base snapshot, and afterwards we can remove the bad working snapshot.

Solaris is very smart 🙂