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Asked: 2026-05-19T09:43:26+00:00

I have a Rails 3 development environment that I need to move to another

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I have a Rails 3 development environment that I need to move to another machine. I would like to know the best way to move the application code, mysql database, and gems with the least amount of disruption?

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  1. Editorial Team

    In development:

    1. Make sure Ruby version is the same. Copy all gems.
    2. Copy application
    3. Make dump of database and load it to new DB. If DB is exactly same version and OS as well copying binary data files may be enough.

    In production the worst part is syncing DB and DNS.

    1. If you can lower TTL (to 1 hour) on DNS entry of your domain – to have DNS propagation respond better.
    2. Wait previous TTL + new TTL to be sure all clients and proxies updated – in a meantime you can prepare Rails 3 app on new machine.
    3. Setup TCP/IP forwarding on new machine 80 port to old machine 80 port, with exception for your workstation (to have access to app instance on new machine).
    4. Finish preparing app, gems, with copy of db, test it.
    5. If everything is ok, change DNS A entry to new host IP – in this case within 1 hour all clients will be connecting to old instance via new one (forwarding). Wait 1 hour.
    6. Now offline: Stop old instance with maintenance message
    7. Make db dump and load it on new instance
    8. Restart new app instance
    9. Turn off forwarding. End of offline.
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