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752 Part V . SUSE Linux in the Enterprise Any configuration changes you want to make to Postfix can be done either through the web interface or through the Postfix configuration files. The same is true of the Cyrus IMAP server. For more information on Postfix and Cyrus, refer to Chapter 17. Administrating SLOX To administrate SLOX, you need to log in to the SLOX interface using a web browser. The administrative user who has full control over SLOX is called cyrus. The cyrus user can control users, services, mail spools, and the monitoring of the SLOX system using the administrative interface. To log in to your SLOX installation, open a web browser and enter the IP address of the SLOX server. If you were a clever administrator, you would have entered the IP address of your SLOX installation into your DNS servers. In this case, you can use the name of the SLOX server to browse to it. Log in with the username cyrus and the password that you set during the SLOX installation (see Figure 30-13). Note Figure 30-13: Logging in to the SLOX administrative interface
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Chapter 30 . SUSE Linux OpenExchange Server 751 Note OpenLDAP The LDAP server stores the virtual domain information, aliases, address books (both personal to the user and the global address book), and user accounts. It is the most important part of your SLOX environment and defines the profile of your SLOX server. You should routinely back up your LDAP server as well as the mail store when deciding on what to save. Whenever a user logs in, the LDAP server is queried multiple times for both the user authentication data and user settings and also to load up the server configuration for the duration of the session. Netline Servlets The Netline servlets provide the groupware functionality of SLOX. This is also where the very important WebDAV (Web-based Distributed Authoring and Versioning) interface is presented to the clients. During the writing of the book, Netline has released an open source version of their application environment. For more information on the Netline program, go to www.open-xchange.org. This is great news because it means the functionality and scalability of the Netline servlets will, we hope, increase dramatically in a short space of time. As all the groupware services are Java servlets, you will see at least one Java pro cess spawn when any groupware activity takes place. WebDAV Most of the groupware data is stored and queried over WebDAV. This is only for the i/oSLOX connectors (which we talk about later in the chapter). If you have any applications that you want to interface with SLOX, you can access calendars, tasks, and projects through a WebDAV interface. WebDAV is a protocol that allows you to access and query files over HTTP, very much like a mixture of FTP and HTTP. As most vendors have embraced this technology, it provides an excellent opportunity for third-party application vendors, or you, to write bolt-on applications that can talk to SLOX directly. For example, we had a customer who wanted to tie in a student database into the user s calendars directly for their timetables. This is all possible through the WebDAV interface, which most operating systems support very well. Cyrus and Postfix All mail-based services are provided by Postfix and Cyrus, both very scalable and reliable mail services. Cyrus and Postfix both rely on the user data stored in LDAP to function correctly. Any user who wants to make an Internet Message Access Protocol (IMAP) connection must exist in the LDAP server to be allowed access to any other SLOX service.
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750 Part V . SUSE Linux in the Enterprise 4. When the SLOX configuration has been finalized, click the Finish button to save your settings and start the SLOX services. Your SLOX system is now ready to use and start adding users. The SLOX Architecture Before we move on to discuss administering and configuring SLOX in more detail, it makes sense to understand the underlying SLOX architecture. To be able to provide you with a feature-rich service, SLOX relies on certain open source and closed source components. Figure 30-12 gives an overview of the components and how they fit together in the overall SLOX architecture. Apache/Jserv Netline servlets PostgreSQL OpenLDAP Cyrus Postfix Figure 30-12: Conceptual overview of SLOX components PostgreSQL All groupware-related data, calendar items, tasks, notes, and so forth are stored in the PostgreSQL database itself. When the user synchronizes his or her data through Outlook, or accesses any calendar or tasks data, the PostgreSQL database is queried. This can lead to a high amount of traffic if your system is used a lot. During the creation of a user, information is stored in the Cyrus mail store, PostgreSQL database, and LDAP server.
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750 Part V . SUSE Linux in the Enterprise 4. When the SLOX configuration has been finalized, click the Finish button to save your settings and start the SLOX services. Your SLOX system is now ready to use and start adding users. The SLOX Architecture Before we move on to discuss administering and configuring SLOX in more detail, it makes sense to understand the underlying SLOX architecture. To be able to provide you with a feature-rich service, SLOX relies on certain open source and closed source components. Figure 30-12 gives an overview of the components and how they fit together in the overall SLOX architecture. Apache/Jserv Netline servlets PostgreSQL OpenLDAP Cyrus Postfix Figure 30-12: Conceptual overview of SLOX components PostgreSQL All groupware-related data, calendar items, tasks, notes, and so forth are stored in the PostgreSQL database itself. When the user synchronizes his or her data through Outlook, or accesses any calendar or tasks data, the PostgreSQL database is queried. This can lead to a high amount of traffic if your system is used a lot. During the creation of a user, information is stored in the Cyrus mail store, PostgreSQL database, and LDAP server.
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Chapter 30 . SUSE Linux OpenExchange Server 749 Figure 30-11: Configuring the LDAP server As with the base used in Chapter 25, the LDAP basedn, it is very important to get this right the first time. Most people use the domain component (dc) to describe the Internet domain that refers to the organization. The basedn you choose will not impact how SLOX runs, but it is important that if you are using this LDAP server as your central authentication server and as a mail server that you choose a basedn that will fit in with your network. Cross-For more information on naming basedn and on LDAP in general, see Chapter 25. Reference Remember that the admin password is not the same as the root password. It is used for the administration of SLOX itself, not the UnitedLinux system. When you log in to the web administrative interface, you will use this password to authenticate as the SLOX administrator. 3. When you are happy with the LDAP server configuration, set the organization name and the country of origin. This is used for presentation purposes in SLOX only. For example, if you set the organization name to Wiley SUSE Bible, this will appear as the organization that a user belongs to when they are added to SLOX through the web interface. The same is true for the country that your SLOX installation resides in.
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748 Part V . SUSE Linux in the Enterprise Figure 30-10: Checking network configuration Configuring SLOX When UnitedLinux has been configured, you move on to the SLOX-specific configuration: 1. We will be configuring SLOX as an Internet-facing mail server, talking to an external Domain Name System (DNS) server (Internet lookup capable). With this in mind, we will not configure an internal DNS or Samba server because this is not needed for the operation of the mail server and is very rarely used in an existing network. If you want to configure a DNS and Samba server, you need to set the workgroup (or Windows domain name) of the Samba server. For the DNS and Dynamic Host Configuration Protocol (DHCP) server, you do not need to enter any more information for the servers to work. The configuration of Samba, DNS, and DHCP is then handled through the SLOX web interface. For more information on Samba, DNS, and DHCP, refer to Chapters 18, 20, and 21. 2. To move past the DNS and Samba configuration and to continue on to the LDAP server configuration, click Next. LDAP server configuration (see Figure 30-11) is integral to the operation of SLOX because all configuration, user, and address book functionality is stored here. Note
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Chapter 30 . SUSE Linux OpenExchange Server 747 Figure 30-8: Configuring name resolution Figure 30-9: Setting the default route
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746 Part V . SUSE Linux in the Enterprise 6. As with normal SUSE installation, enter the IP and subnet mask of the node (see Figure 30-7) and click Next. 7. When configuring the name resolution (see Figure 30-8), you must be sure that your DNS server can do external lookups for Internet servers. This is needed because SLOX will have to do many MX lookups when sending mail to other Internet users. The domain name your SLOX server is given will also dictate what mail, out of the box, your SLOX server receives. For example, we have set the domain to be susebible.com. By default, SLOX is able to receive mail for user@susebible.com without any further configuration. You can further configure SLOX after it is installed to receive mail for other domains, and we talk about this later in the chapter. 8. Set the default route for the SLOX installation (see Figure 30-9). 9. After the network has been configured, you will be returned to the network overview screen (see Figure 30-10); check your settings and click Finish to save your network configuration. Figure 30-7: Configuring the IP address of the SLOX installation
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Chapter 30 . SUSE Linux OpenExchange Server 745 Figure 30-5: Configuring ancillary hardware Figure 30-6: Configuring your network
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744 Part V . SUSE Linux in the Enterprise Figure 30-4: X configuration 3. When you are happy with the X configuration, YaST will run SuSEconfig to commit the changes to the system. 4. As with the standard SUSE installation, you will be asked to configure ancillary hardware (see Figure 30-5). If you want to use SLOX to provide printing for your network, you can configure it here. 5. When you are happy with the hardware configuration, configure your network (see Figure 30-6). Select the network card you want to configure for connectivity and press Configure to continue with the IP configuration. When the network configuration is saved in SLOX, it is not easy to change it at a later date because some configuration for the running services relies on the IP address of the SLOX installation being static for the life of the installation. It is possible to change it, but it may prove to be more hassle than it is worth. With this in mind, make sure the IP address you need to assign to SLOX is the final address for your network. Note
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