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Testing the Samba and OpenLDAP Setup
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As a final test, click Start My Computer and find the network drive icon. It should look like the one in Figure 16-18.
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Figure 16-18. The network drive for toyuser1 as drive Z 1. 2. 3. Double-click on that icon to open its folder window. Right-click in that folder window and select New Text Document. Name that document from_win_client.txt. Go back to the DCTOYS domain controller machine and as root, type the command ls l /home/toyuser1. You will see the empty text document you have created from the Windows machine while logged as the toyuser1 network user as shown in Figure 16-19.
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Figure 16-19. The from_win_client.txt text document that the toyuser1 network user created If you see the file, you did it!
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CHAPTER 16 DIRECTORY SERVICES
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Troubleshooting Tactics
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If your setup does not work, you can do some fixes on it. Here are the common pitfalls in implementing this server combination and their solutions.
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Pitfall #1: Cannot log into the domain controller
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First, check your machines to see if the network is set up properly. Can they see each other using the ping command Second, a reboot may be needed for each virtual machine if you are doing this setup on a virtualized environment. It is a good idea to restart the sample Windows machine as well, and then try joining again.
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Pitfall #2: Cannot start the Samba server properly because only the nmbd process is running
With this problem, it is most likely that you have misconfigured or corrupted your LDAP database along the way. The Samba server is trying its best to connect to the LDAP server but cannot, because of a problem with the current database. All you have to do is to redo the setup from scratch using a new database named with a different distinguished name. For example, suppose you tried step 2 of the Installing and Configuring smbldap-tools procedure a few times and the Samba server still won t run with OpenLDAP using the distinguished name dc=dctoys,dc=com. Just rename the database to something else such as dc=dctoys1,dc=com, for example, and things will be fine. If you still cannot fix the problem, it is recommended that you browse the log files of Samba in the /var/log/samba directory and the general log file, messages, in the /var/log directory. From there, you can check the Samba, OpenLDAP, and SmbLdap-tools web sites to see if the problems you are experiencing have been solved by other users.
Summary
You have learned the importance of having a centralized authentication server for both Linux/Unix networks and hybrid services networks. NIS can be used if the network is a Linux network only. For other services that need directory services such as Samba, OpenLDAP can be used to provide a single authentication reference. In the next chapter, you will learn how to change the Linux kernel to match your operating system needs. You will modify the existing kernel, use modules, and even make a new one fresh from the Internet.
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CHAPTER 16 DIRECTORY SERVICES
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C H A P T E R 17
The Linux Kernel
The kernel is the core of an operating system. It is responsible for allocating and managing system resources for both hardware and software. Much as the human brain controls the muscular system, the kernel issues commands to the rest of the operating system that enable it to function properly. Instead of managing muscles and cells, though, the kernel communicates with the hardware by keeping tabs on device drivers, which interface with the hardware. The kernel also allocates computer resources to the user software. In this chapter, you will learn about the origins of the Linux kernel and the types of kernels you can build. You will also learn how to use kernel modules that can let us add and remove features to a Linux system. Finally, you will see how to rebuild a new kernel that can be used for deployment.
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