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The service status postings for these changes are a bit miss-leading. There should be NO need for anyone to do anything when our changes are made. Before we make any changes to load balanced services with a high profile we set the TTL down for a few days leading up to that change. Like Troy said. This will mean that systems should not be caching that information very long, and would only have to flush their local DNS if they visit the site in the five minutes before the change, and again within 5 minutes. So in short, the service status will be changed to remove the statement of rebooting, as this should not be an issue, and even if it is, it won't be for more that 5 minutes with or without a reboot. -- Jeff Utter From: MSU Network Administrators Group [mailto:[log in to unmask]] On Behalf Of Troy Murray Sent: Friday, April 24, 2009 8:39 AM To: [log in to unmask] Subject: Re: [MSUNAG] Fwd: [SERVICESTATGEN] MAIL.MSU.EDU Scheduled Maintenance Open: Load Balancer Upgraded - www.msu.edu My guess is it's probably easier to tell the user to reboot their PC then telling them, on Windows, to open a Command Prompt window and type in "ipconfig /flushdns", or corresponding commands for different OS. -t _____ From: MSU Network Administrators Group on behalf of Michael Surato Sent: Fri 4/24/2009 8:38 AM To: [log in to unmask] Subject: Re: [MSUNAG] Fwd: [SERVICESTATGEN] MAIL.MSU.EDU Scheduled Maintenance Open: Load Balancer Upgraded - www.msu.edu Sounds reasonable. What concerns me is the requirement in the announcement "To reach www.msu.edu users may need to reboot their PC, and clear their DNS cache". Perhaps this is another case of poor wording choice? -- +-------------------------------------------+ | Michael Surato | | College of Arts and Letters | | Michigan State University | | 320 Linton Hall | | East Lansing, MI 48824 | | Voice: (517) 353-0778 Fax: (517) 355-0159 | +-------------------------------------------+ >>> On 4/24/2009 at 8:31 AM, Troy Murray <[log in to unmask]> wrote: > I recently did something very similiar for an external client. A few days in > advance I changed the DNS records Time To Live (TTL) value to expire those > DNS cached records after 5 minutes. So, after the change over, external > clients (WWW, SMTP, etc) would at most ben 5 minutes before finding the > servers at their new IP addresses. > > I think this answers your question, at least how I understand it. > > -- > Troy Murray > Informatics Specialist > Michigan State University > Biomedical Research & Informatics Center (BRIC) > 100 Conrad Hall > East Lansing, MI 48824 > Phone: 517-432-4248 > Fax: 517-353-9420 > E-mail: [log in to unmask] > > ________________________________ > > From: MSU Network Administrators Group on behalf of Michael Surato > Sent: Fri 4/24/2009 8:29 AM > To: [log in to unmask] > Subject: [MSUNAG] Fwd: [SERVICESTATGEN] MAIL.MSU.EDU Scheduled Maintenance > Open: Load Balancer Upgraded - www.msu.edu > > > > Perhaps I have been misinformed. If so, could someone please correct my > understanding. > > My understanding is that DNS servers caches responses from authoritative DNS > servers for approximately two days. If this is so then users external to the > university who's DNS servers have cached the old IP address will be sent to > the old IP address for up to two days after this change. If you plan on > immediately dropping the old IP address, as it appears in this message that > you are doing, then for up to two days www.msu.edu would cease to exist for > these users for that period of time. Somehow I do not find this to be > acceptable. As I am not intimately familiar with load balancers could someone > please help me understand how this process could be mitigated? > > Thank you very much! > -- > > +-------------------------------------------+ > | Michael Surato | > | College of Arts and Letters | > | Michigan State University | > | 320 Linton Hall | > | East Lansing, MI 48824 | > | Voice: (517) 353-0778 Fax: (517) 355-0159 | > +-------------------------------------------+ > >>>> On 4/23/2009 at 4:32 PM, MSU ATS Help Desk <[log in to unmask]> wrote: >> Service: MAIL.MSU.EDU >> Type: Scheduled Maintenance >> Title: Load Balancer Upgraded - www.msu.edu >> Status: Open >> Approximate Start Time: 5/13/2009 6:00:00 AM >> Approximate End Time: 5/13/2009 7:45:00 AM >> >> Comments: www.msu.edu will be moved behind a new load balancer and will have >> a new IP address after this change. To reach www.msu.edu users may need to >> reboot their PC, and clear their DNS cache. >> >> *********** >> >> Status updates on this and other campus technology services can be found at >> http://servicestatus.msu.edu <http://servicestatus.msu.edu/> <http://servicestatus.msu.edu/> >> >> >> You can remove yourself from the mailing list by sending a mail message to >> [log in to unmask] with the following command in the first line of the text >> of your message. >> >> SIGNOFF SERVICESTATGEN >> >> You will receive confirmation of your request via email.