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Upon the successful installation of your base OpenLDAP distribution, you re left with an empty directory and a large virtual box of tools. For you to have a functional directory server, you need to install a directory. You have a number of options you can use depending on your particular scenario. For small deployments, or if this is a stand-alone instance, creating a database manually may be sufficient. For larger infrastructures, using LDAP tools to create and maintain your directory remotely is a more appropriate method.
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CHAPTER 4 s INSTALLING OPENLDAP
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For these examples, you ll be working with a standard set of assumptions about your infrastructure, as shown in Table 4-2. Table 4-2. Environment Assumptions
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Token
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Suffix Directory rootdn
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Value
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"dc=Your,dc=Company" /usr/local/var/openldap-data "cn=Directory Manager"
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Explanation
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This is the base distinguished name (DN). This is where the index files will reside. This is your directory administrator, equivalent to the root or administrator of your systems. This is the password for your rootdn.
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rootpw
Password
You need to create all the directories specified in Table 4-2 with the appropriate permissions so that slapd can write to them. Additionally, the first accounts you ll be using to modify information in your directory should be treated as root accounts that is, you have full control of the directory using these accounts. These are special accounts that are hard-coded externally within your configuration files and will also have the ability to modify your directory. Finally, you should make sure the database definition within your slapd configuration file contains the index definitions you want; use the following code: index {<attrlist> | default} [pres,eq,approx,sub,none] For example, to index the cn sn, uid, and objectclass attributes, you can use the following index directives: index cn,sn,uid pres,eq,approx,sub index objectClass eq This creates presence, equality, approximate, and substring indexes for the cn, sn, and uid attributes and an equality index for the objectClass attribute. Note that not all index types are available with all attribute types. While it d be easy to overdo the indexing on your system and add all types of indexes for every attribute you have available, this method would soon be selfdefeating, as the system resources you have available will not be utilized appropriately. Once you ve configured things to your liking, you can start slapd, connect to your new directory with your LDAP client, and start adding entries to your null database. The initial set of data you ll need to add is the base organizational information (the base DN) and the Directory Information Tree hierarchy. Create an LDAP Interchange Format (LDIF) file containing this information and save it, as it will be used to create the base of all your future systems. A sample LDIF may look like this: # Base Configuration for Your Company dn: dc=Your,dc=Company objectclass: dcObject objectclass: organization dc: Your o: Your Company description: Your Company dot Com
CHAPTER 4 s INSTALLING OPENLDAP
# Standard INTERNAL Organizational Units dn: ou=Internal, dc=Your,dc=Company objectclass: organizationalunit ou: Internal description: Internal Components # Standard EXTERNAL Organizational Units dn: ou=External,dc=Your,dc=Company objectclass: organizationalunit ou: External description: External Components You can use the ldapadd or ldapmodify commands, which are explained in the next section, to add these entries to your directory. This method is generic enough to work for almost all LDAP implementations. This is because standard LDAP methods are used along with standard LDAP application programming interfaces (APIs). The target systems are treated as generic LDAP hosts, and no implementation specific tools are used. Figure 4-1 demonstrates the difference between using LDAP-based tools versus those that depend on the implementation.
Figure 4-1. Communication via LDAP API versus implementation-specific methods
The next section demonstrates a real example of communication via specific implementation methods. Although communicating with your directory using system tools may be quicker, it may not scale and may change between implementations and versions.
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