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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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MySQL Bin Files Eating Lots of Disk Space

Q. I get a large amount of bin files in the MySQL data directory called "server-bin.n" or mysql-bin.00000n, where n is a number that increments. What is MySQL Binary Log? How do I stop these files being created?
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Q. Recently we made changes to our server hardware and swapped all IP address from old to a new server. However, 2 IP addresses are not get updated due to arp cache issues (IPs are cached on the router). They are going to other servers. How do I solve this problem under Redhat Enterprise Linux version 5.0 or any other Linux distribution?
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