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Thread: Moving to a New Server

  1. #11
    Member Needs New Keyboard Array MyITGuy's Avatar
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    Quote Originally Posted by vangogh View Post
    I thought about putting the site on the current, soon to be old server, in maintenance mode, but I didn't want to shut things down for a couple of days. It's hard to know when all the DNS cache around the web has been changed. I suppose people would only see the maintenance message if they're looking at the old site so maybe that's what I'll end up doing.
    If you drop the TTL value down (qhich looks like you did as I see it set to 300), the cached queries will be reduced quite significantly and everyone should be hitting the new server within the hour, unless the user intentionally overrides the TTL values by maintaining their own DNS/Cache server.

    In the event it helps, two quick tools to use to check propagation are:
    http://viewdns.info/propagation/?dom...ness-forum.net
    https://cachecheck.opendns.com/ (Check and Refresh)
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  2. #12
    Member Needs New Keyboard Array Brian Altenhofel's Avatar
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    For what it's worth, I've had success with dropping TTL as low as 60 seconds. There are a few ISPs that won't honor it, but they almost always fallback to 1 hour.

    If your new host is handling data migration, no reason not to let them. The (oversimplified) steps I usually take for a migration are:

    1. Lower DNS TTL
    2. Setup database at new host as a replication slave to the old host.
    3. Wait to schedule switchover until database at new host is within a few seconds of slave lag to old host.
    4. Promote slave at new host to master and switch master at old host to slave (in case there needs to be a rollback to the old host).
    5. Configure app at old host to point to database at new host.
    6. Switch DNS.

    Usually 95% of traffic is switched over within 2xTTL, and most of the rest is switched within an hour. Typically I'll keep the old host online for 48 hours just to be sure and then drop it. There are some ISPs and services (particularly search engine bots) that do permanently cache a DNS entry until that IP quits responding to that domain name (which can be a big issue if switching from a really cheap shared host whose servers use a default vhost entry).
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  3. #13
    Post Impressionist Array vangogh's Avatar
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    Thanks for the help guys. Everything has been moved and I put the forum on the old server into maintenance mode. If you're seeing this, you're on the new server.
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    Man, took a while to propagate. But I'm on the new server now.

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    Post Impressionist Array vangogh's Avatar
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    Wow. It shouldn't have taken that long. I changed nameservers on Friday evening. For me things propagated sometime Saturday evening, but I noticed some people already had access later Friday night and more by Saturday morning. By Sunday evening all the propagation should have been finished. I wonder if your ISP or your computer hangs on to DNS cache longer than it should.
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    For me godddy propitiates within minutes. I tried it late Monday and nothing. Just triied it a few hours ago and it's on the new serer???????

  8. #17
    Post Impressionist Array vangogh's Avatar
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    GoDaddy wouldn't have anything to do with this. It's not about the server itself or the registrar. 30 seconds after I changed nameservers, who-is records were showing the change. The reason it can take so long to see the changes is because ISPs cache DNS information to generally help speed up connection times. Some ISPs take longer to replace their cache of the DNS records and until they do they keep pointing to the old server.

    When you were able to see the new site depends on when your ISP updates its DNS records.

    I changes my hosts file on an older computer so that computer would always see the site on the new server, even before I made the nameserver changes. The new server started getting traffic within a few hours. My ISP updated some time on Saturday, though plenty of people were already here by then.

    I'm not sure why it took so long for you to see the changes though. Within 48 hours every ISP should have flushed their DNS cache and been using the new information, but for some reason it was another day or so on your end. No matter. It's working now.
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    Whenever I've changed nameservers its pretty much immediate. I understand how the ISP's update as described above. Just weird how long it took this time.

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