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I need to be able to do live replication of a running Ubuntu server, so if the main machine goes down I can automatically failover to the other machine. I found mklivecd, but that seems to only get me to having a current backup. While that's certainly close, what I really want is to know that everything is already installed on the other machine live. Is there another utility I can pair up with mklivecd, or is there a better way?

Update: This is a web and database server, with files (ie images) that are added throughout the day. DRDB looks like it might do the job; we'll look into it. Thank you all very much!

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You want to do live replication of a complete system or just it's data ? – Iain♦ Dec 11 '11 at 15:09
What you need to do to reach your goal is dependent on the services you offer from the server. E.g., a file server has different requirements to offer a fail over than a DNS or LDAP server. Anyway, a guide to a complete solution is out of the scope of this site, but we can help with specific problems of your implementation, and we could give you a few hints about what to look for if you extend your question a bit. – SvenW Dec 12 '11 at 16:07
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You want something like DRDB or rsync in a frequent cron. I'd choose DRDB, personally.

mklivecd is certainly not the right tool for this job, dont even try to make it fit.

Edit: I just saw that you updated saying this is a database and web server. You'll want to use your DBMS' replication engine for that and use DRDB for the web content. You shouldn't use DRDB for live databases.

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