On 05/31/2013 04:35 PM, Winnie Lacesso wrote:
> If you would extract some general information in a timeslice, that would
> benefit myself& anyone else who might in future go thru similar.
Here you are, some details may be missing but basically that's it.
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Involved services :
* xrootd manager and xrootd servers (~20)
* Vmware virtual machines : BDII,VOBOX,CREAM(2),ARGUS server
Torque server, DPM head+disk node
* Worker nodes (~40)
Preparation
A week before :
* Notify the VOs
* Declare GOC-DB Downtime from Day-1 17:00 to Day-2 17:00 (24h)
* Notify NGI and all partners
The day before Day-1 around 17:00 :
* Drain CREAM-CEs (Alice jobs run for about 24h)
* Prepare Quattor profiles
* Prepare firewall filters for the new network segment
* Create new virtual switch for the new network on VMware servers
Day-1 at 17:00
Stop services
* Stop xrootd services
* Change IP of VMware virtual machines that support all services
and stop them
* Reconfigure the virtual network so that VMs are connected to the
right network segment
* Modify the DNS (modification will spread during the night)
Day-2 at 7:30
Start services
* Start xrootd servers, change IP, restart and start xrootd
services (servers and manager)
* Start service nodes : BDII,Torque server, CREAM, VOBOX, Argus,
* Modify IPs of worker nodes and restart them (see comment below)
Checks (many with the help of the NGI's nagios box)
Post-install
* We had to give the new addresses of Torque server and CREAMs
to the administrator of the MonBox since they filter the clients
on the base of their IPs
* Modify our local Nagios to take into account the new IPs
Comment : Here I do not give details on how to deal with an IP
modification for the Quattor managed worker nodes.
Comment : At the same time, we changed the NFS server used by worker nodes
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So, you see, it was pretty straighforward for us...
JM
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Jean-michel BARBET | Tel: +33 (0)2 51 85 84 86
Laboratoire SUBATECH Nantes France | Fax: +33 (0)2 51 85 84 79
CNRS-IN2P3/Ecole des Mines/Universite | E-Mail: [log in to unmask]
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