Vlan transition/ IP Changes
Posted on 2012-08-30
I'm meant be performing a task which involves 600 Virtual servers( Linux, Windows - running on vSphere env with several esx hosts.) to be re-IP'd which includes the VLan's where these servers run on.
So, I'm supposed to come up with a high level design plan/document ( not doing the work myself) overview of tasks to ensure that everything involved in doing a re-IP of a server which includes adding/moving to new Vlan's is thought about.
There will be appropriate SME's who will carry out the work, ie: System Admin's,
network people, ESX people, Database people, Storage people, Application people, etc,etc,etc.
So far I have the bottom "pieces", but I'm sure that I've
missed quite a few...
some of things I've come up with
- assume change mgmt processes will be used and coordinated
- assume that all apps are able to be re-IP'ed ( we don't know this )
- all apps shutdown with no restart before doing any work.
- all esx hosts are able to support/connect to the new Vlans
- the datastores have to be available to different vcenters that will
- add into ipam new ipadresses
- dns reverse/forwarded - take into account it takes time to propagate
- re-ip actual servers
- put back old ip addresses/ Remove from IPAM
- re ip the actual applications
- Database Ip changes, ie: tnsnames.ora
- what apps have to be moved together, ie: group of machines, for
example, 3 tier app, should be moved together where possible.
- backups .. are there any existing "live" backups and if they need to
be restored, would it be able to be restored to new infrastructure, ie: new storage
- what sort of storage vmdk, san/netapp, emc, Iscsi on the vcenters.
Are there any firewalls between these and the new Vlan's/ESX
- Current mgmt servers/ automation/ monitoring. How will they know
about the "migrated"/ re IP'ed servers.
- When do the mgmt servers get migrated, first/last ?
Has anyone done such a task before and is able to contribute/assist in this matter?
thanks for taking the time to read this and to give their opinions and share their experience.