CentOS: Red Hat Enterprise Linux, Minus Red Hat - page 4
Getting Something For NothingConsistency in an uncertain world has its own weird appeal, even when it's for the wrong things. CentOS runs a number of default services that it shouldn't, like mdmonitor for RAID monitoring and management on systems that don't even use RAID; sshd; bootpc; and xinetd when it is not managing any services. Run netstat --inet -a to see what your CentOS system is listening for; you'll get an eyeful. Sure, these might all be things you want to have running. If that's the case, it's generally wiser to have to turn them on. Old-fashioned security-minded admins go by "deny all, allow as needed."
Sendmail still lingers like a houseguest that won't leave, like a squatter that you can't evict. The only way to get rid of Sendmail is after installation, even with a completely custom installation. This is puzzling, since Postfix is also an installation option. To use Postfix, you must first remove Sendmail.
Solid state disks (SSDs) made a splash in consumer technology, and now the technology has its eyes on the enterprise storage market. Download this eBook to see what SSDs can do for your infrastructure and review the pros and cons of this potentially game-changing storage technology.
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