Help! Server Attack

[Rocket1]

On a non-managed Linux dedicated via GoDaddy. We have had an issue over the last two weeks with our server shutting down. Below is a response from the server peeps on the cause. Any suggestions would be greatly appreciated.

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First off we are showing a large number of failed log in attempts and failed DNS lookups. These are results of attackers attempting to brute force your password, and domains resolving to your servers IP. You should be able to block most of this traffic through firewall rules.

The second issue, is that your mysql service is consuming 100% of the cpu, and you are maxing out your email relays. Normally these would be separate issues but they are directly related to each other. The reason why your email relays are getting maxed out is that your server is trying to send you email notices that your vbulletin database queries are failing. These same database queries are causing your mysql service load to spike.

My suggestion would be to review online for ways to harden a Linux server. This will provide you with suggestions on changes you can make to your server configuration that would make it so attacks against the server do not have as much of an effect on the operating level of the server.

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Anyone have any tricks to help out with this?