Migrating a website to a new host is a critical task that often causes anxiety due to potential downtime or data loss. The main challenge is that DNS records do not update instantly, and file copying can occur while the site is actively changing. To avoid these risks, it is essential to follow a precise sequence of actions that allows for the migration of any PHP resource, whether it is WordPress or Laravel, within an hour with minimal risk to project stability.
The first step is to reduce the Time-to-Live (TTL) of DNS records. Lowering this value to 300 seconds a day before the migration ensures that after the IP address change, user browsers quickly receive updated information. This is a crucial step because, without it, visitors might continue to access the old server for an extended period, leading to data conflicts and errors during the transition to the new infrastructure.
The next stage involves copying files and the database. Using the rsync utility allows for the efficient transfer of only changed data, which significantly speeds up the process. For the database, it is recommended to use mysqldump with the single-transaction parameter, which ensures a consistent snapshot is created without locking tables. This allows the site to remain accessible to visitors even during the backup process, which is a key factor for maintaining continuous operation during migration.
Before the final DNS switch, it is vital to test the site copy on the new server. This can be done by editing the local hosts file on your computer, allowing you to view the site on the new host while it remains on the old one for everyone else. At this stage, you should check the functionality of all forms, the admin panel, and file uploads to ensure that configuration files, such as wp-config.php, are set up correctly.
After successful testing, you must issue an SSL certificate. Using DNS validation allows you to obtain the certificate even before switching traffic, which eliminates browser warnings for users. Just before the actual switch, it is worth putting the site into maintenance mode for a few minutes to perform a final synchronization of files and the database. This ensures that no transactions or comments made at the last moment are lost during the host change.
Finally, do not forget about additional services such as email, cron jobs, and API keys. Using tools like imapsync will help move mailboxes without loss. It is also important to update SPF records to avoid email delivery issues. It is recommended to keep the old hosting active for a week after the migration so you can recover any forgotten settings or data that might have been missed during the project transfer process.
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