IT reseller takeaway: Virtualizing your customers' database instances allows you to offer them extra data backup and protection, bringing them peace-of-mind during a migration, repair or server crash. This tip excerpt from our sister site SearchServerVirtualization.com will get you started.
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Virtualizing your database instances is one of the pleasures of running virtual machines (VMs). Here are a few situations and resolutions that I have had to deal with in the past few months, and the nitty-gritty of how I escaped database pain.
MySQL database move
Recently, I had to migrate a database from one VM to another, while neither taking down or restarting either VM or running MySQL instance. Normally, this can be accomplished with some form of:
mysqldump databasename >filetodumpto.sql mysql -u user -ppassword databasename < filetodumpto.sql
Exporting and then importing works when trying to move data, but when you introduce binary blobs and GBs of data, it becomes much more time-consuming.
Thankfully, there is an all-powerful program that every MySQL wannabe should have in their technical repertoire: mysqlcheck. When migrating database servers, recovering from a mysql server crash, repairing corrupt databases/tables, or other unexpected database/table catastrophes occur, the 'mysqlcheck' program comes to the rescue.
Here's a fairly standard workflow:
scp -r /var/lib/mysql/dbname server:/var/lib/mysql/ chown -R mysql:mysql /var/lib/dbname mysqlcheck -h localhost -u user -r -p -B dbname
The mysqlcheck program often helps when you are powering off (accidentally or otherwise) VMs and you corrupt your mysql instances/table/etc.Read the entire article.