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For instance, a high availability server requires multiple, fast processors, lots of memory and high bandwidth interfaces for disk and network In short, it has to be a top quality machine A word processor does not Purchasing such a machine might complicate host management slightly Tools such as cfengine can help integrate hosts with special functions painlessly Having chosen the necessary hardware and software, we have to address the function of each host within the community, ie the delegation of specialized tasks called services to particular hosts, and also the competition between users and hosts for resources, both local and distributed For all of this to work with some measure of equilibrium, it has to be carefully planned and orchestrated In the deployment of machinery, there are two opposing philosophies: one machine, one job, and the consolidated approach.

When you have found the user account, select it and click User Data. You are presented with the details that you previously filled in for the user. If you want to be able to edit all information relating to a user, such as their birthday, title, and so on, click Long attribute list to get a screen like the one shown in Figure 29-17.

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When the user has been created, you need to create the virtual domain that you also wish to receive mail for. This machine is specifically for the SUSE Bible authors and editors, but we also want to be able to receive mail for the wiley.com domain. To create a virtual domain, select the Network Services section and then select the Virtual Domains subsection. You will arrive at the screen shown in Figure 29-18. To create a new virtual domain, enter the new domain and press Add. This adds the domain to the SLOX configuration.

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In the first case, we buy a new host for each new task on the network For instance, there is a mail server and a printer server and a disk server, and so on This approach was originally used in PC networks running DOS, because each host was only capable of running one program at a time That does not mean that it is redundant today: the distributed approach still has the advantage of spreading the load of service across several hosts This is useful if the hosts are also workstations which are used interactively by.

Figure 29-18: Creating a virtual domain Notice that there is a letter next to the domain on the domain list. This letter signifies what type of domain you are creating: In a Sendmail [S] virtual domain, a single, flat namespace is used. If you have wiley.com and susebible.com as domains hosted on this mail server, you must use unique mail recipients. For example, as we have already created the user justin, any mail for justin@wiley .com and justin@susebible.com will go to the same person, justin. For most people, this is fine because their organization may have a few domains that they have acquired over the years that they want to work across the organization. A Postfix [P] virtual domain, on the other hand, segregates virtual domain users from each other. So justin@susebible.com and justin@wiley.com are seen as two separate email accounts. If you want mail from justin@wiley.com to be received by the user justin, you will have to tell Postfix to do this for you.

Configuration of e-mail is one of the most complex issues for the system administrator, because it involves both nagging policy decisions and technical acrobatics. For many system administrators, the phrase Nightmares on ELM3 street does not conjure up a vision of Freddie Kruger, but of dark nights spent with e-mail configuration. E-mail is used for so many crucial

Each virtual domain type has pros and cons, and you need to make a decision on what virtual domain type you want to use. We are going to use a Sendmail-style virtual domain because we have only a small mail server and want to let our users choose between having a wiley.com and a susebible.com address. When the domain has been created, suppose you want to make all mail for info@wiley.com go to the user justin. (Apparently the editors were so happy with the book that they asked Justin if he wanted a job looking after any general inquiries coming into Wiley!) In that case, you have to assign a virtual user to a real user.

To create a virtual user, you need to go back to the User section. Select the Create Virtual Users subsection. You will see a screen like that shown in Figure 29-19.

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3 ELM is a free mail reader written by an employee of Hewlett-Packard which redefined the standard for e-mail interfaces in the 1980s.

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