Showing posts from August, 2012

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VMware on AWS - How to restore NSX DFW firewall rules to previous state

Customers who uses NSX day-in, day-out would like to have a point-in time restore functionality of DFW firewall rules. Many customer have a large footprints in VMC and make changes to DFW quite often. This feature was missing for long time and we could see its included in recent versions . Let's see how DFW configuration roll back works  NSX DFW configuration has versioning, and it is stored in the NSX Manager.  Every time when someone update DFW configuration, NSX creates one more version but keep storing the previous ones. You can rollback for previous config but reapplying it once again.  You can find the options under Networking & Security tab , > Security > Distributed Firewall . In the right side we see an Actions drop down. Choose View to get to the below screen.  Let’s go through the use case:  1. Original state- default config with no custom rules:  a. There are no saved configurations during last 30 days: In my existing test setup, with the current setting

Remove a LUN from ESX host

ESXi 5.0 To avoid the rather complex set of instructions that you needed to follow in 4.1, VMware introduced new  detach  and  unmount operations to the vSphere UI & the CLI. As per  KB 2004605 , to avoid an APD condition in 5.0, all you need to do now is to  detach  the device from the ESX. This will automatically unmount the VMFS volume first. If there are objects still using the datastore, you will be informed. You no longer have to mess about creating and deleting rules in the PSA to do this safely. The steps now are: Unregister all objects from the datastore including VMs and Templates Ensure that no 3rd party tools are accessing the datastore Ensure that no vSphere features, such as Storage I/O Control or Storage DRS, are using the device Detach the device from the ESX host; this will also initiate an unmount operation Physically unpresent the LUN from the ESX host using the appropriate array tools Rescan the SAN

Linux disable console blanking and powersave

# setterm -powersave off -blank 0 Useful on the console of virtual hosts in vmware or virtualbox, for example.