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WordPress Rename Image URL For a CDN Usage

Recently, we moved all our static assets to a CDN (Content Delivery Network) as described here. However, we have over 8000+ old blog posts and we need to point static images url to our CDN account hosted at http://MyACCOUNT.cloudfront.net/images/ folder. How do I rename all image urls stored in wordpress posts? How do I offload static images to a CDN urls under WordPress?
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I'm trying to make backups using the mysqldump command and getting the following error or warning:

mysqldump: Got error: 1044: Access denied for user 'root'@'localhost' to database 'information_schema' when using LOCK TABLES

How do I fix this problem?
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How To: Upgrade CentOS Linux 5.3 to v5.4

How do I upgrade CentOS Linux from version 5.3 to latest version 5.4 over the Internet?
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