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It has now been a few years (2007) that SNI (Server Name Indication) has been introduced/supported in OpenSSL 0.9.8, but it has only been just last year that SNI was fully supported in Apache2 with version 2.2.12 released in July 2009. Now we can really having
multiple virtual hosts with different certificates on the same IP address! No need to buy any more IP addresses!

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When you want to backup your mysql databases, you usually do mysqldump ... --all-databases or mysqldump ... --databases mysql ... but you end up with the whole mysql table which is a pain to insert back when you need it because it can mess up the root password or the debian-sys-maint user...

If you wish to just backup all the users and privileges other than root and debian-sys-maint, you can use this command:

mysqldump -nt -uroot -p -w"User NOT LIKE 'root' AND User NOT LIKE 'debian%'" mysql user db > users_privs.sql

Here's an explanation of each of the options:

• -nt: Do not add "drop table" and "create table".
• -uroot -p: Connect as root and ask for a password
• -w...: Add a "WHERE" condition to each query. We exclude everything related to root and debian-sys-maint.
• mysql user db: Dump the user and db tables from the mysql database.
• > users_privs.sql: Store the sql dump into the users_privs.sql file.

A new version of your operating system just got released and you want to have a fresh new install, or you want to migrate all of your data to another machine. There are so much stuff to backup that you don't even know where to start?
I will try to list the most common stuff (on a web-server) to backup or copy somewhere when you want to do a server migration.

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