[LON-CAPA-admin] Server migration

Guy Albertelli II guy at albertelli.com
Wed Jan 10 13:45:13 EST 2007

Hi Stefan,

> Guy Albertelli II wrote:
> > Let me know if anything need more clarification.
> Thanks for your help so far.
> > [...]
> The procedure you describe seems managable for us:
> (in short)
> - Prepare new server (install, configure and test OS and LON-CAPA)
> - Transfer data from old to new server
> - Shut down/Disconnect old server
> - Activate new server

Yesish. But the details are very important.

And I think I'd make the summary.

  - Prepare new server (install, configure and test OS and LON-CAPA)
  - Disable lon-capa access on old server
  - Transfer data from old to new server
  - Shut down old server
  - "Activate" new server

> One question left concerning the hostname, DNS name and IP address:
> > * change the hostname on the new machine to the same DNS name as the old
> > * either
> >    - switch the IP address of the new box to be the same as the old
> >      (I highly suggest this one. On Fedora you can easily change both
> >       the IP and the hostname using the xwindows application
> >       system-config-network )
> >    or
> >    - switch the DNS entry
> > * run the loncapa UPDATE prcoedure, configure it to be in the
> >   production cluster and give it the settings you had on the old box
> > * reboot the new box
> The old server should not be seen again in the LON-CAPA cluster, but the
> new one. The new server needs to have a new DNS name AND a new IP address.
> Is this possible?

I don't suggest doing that.

I highly suggest doing:

       - install and configure new machine with any new IP adress and
         any new DNS name

       - turn off loncontrol/httpd on old server

       - rsync data from old to new server

       - turn power off from old server

       - change the IP address and DNS of the new server to be
          polya.informatik.fh-wolfenbuettel.de ->

       - reboot the new box

If anything fails in this procedure you can then just turn off the new
server and turn the old server back on and then figure out what needs
to be done differently.

guy at albertelli.com   0-7-1-6-27,137

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