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My server is meant to have one name in the datacenter ISP's domain and another in our company domain. How do I set this up correctly? Can I set multiple names in /etc/hostname? (The OS is Ubuntu 10.04 Serer).

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A server can only have one hostname listed in /etc/hostname. I would list your company's preferred name there. You can, however, point as many different DNS records at the server as you want, either via your /etc/hosts or via your company's DNS server infrastructure.

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