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Chapter 8. Integrating Red Hat Gluster Storage with Windows Active Directory

In this chapter, the tasks necessary for integrating Red Hat Gluster Storage nodes into an existing Windows Active Directory domain are described. The following diagram describes the architecture of integrating Red Hat Gluster Storage with Windows Active Directory.
Active Directory Integration
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Active Directory Integration

Figure 8.1. Active Directory Integration

This section assumes that you have an active directory domain installed. Before we go ahead with the configuration details, following is a list of data along with examples that will be used in the sections ahead.
Expand
Table 8.1. 
InformationExample Value
DNS domain name / realmaddom.example.com
NetBIOS domain nameADDOM
Name of administrative accountadministrator
RHGS nodesrhs-srv1.addom.example.com, 192.168.56.10 rhs-srv2.addom.example.com, 192.168.56.11 rhs-srv3.addom.example.com, 192.168.56.12
Netbios name of the clusterRHS-SMB

8.1. Prerequisites
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Before integration, the following steps have to be completed on an existing Red Hat Gluster Storage environment:
  • Name Resolution

    The Red Hat Gluster Storage nodes must be able to resolve names from the AD domain via DNS. To verify the same you can use the following command: 

    host dc1.addom.example.com
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    where, addom.example.com is the AD domain and dc1 is the name of a domain controller.
    For example, the /etc/resolv.conf file in a static network configuration could look like this: 
    domain addom.example.com
search addom.example.com
nameserver 10.11.12.1 # dc1.addom.example.com
nameserver 10.11.12.2 # dc2.addom.example.com
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    This example assumes that both the domain controllers are also the DNS servers of the domain.
  • Kerberos Packages

    If you want to use the kerberos client utilities, like kinit and klist, then manually install the krb5-workstation using the following command: 

    # yum -y install krb5-workstation
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  • Synchronize Time Service

    It is essential that the time service on each Red Hat Gluster Storage node and the Windows Active Directory server are synchronized, else the Kerberos authentication may fail due to clock skew. In environments where time services are not reliable, the best practice is to configure the Red Hat Gluster Storage nodes to synchronize time from the Windows Server.

    On each Red Hat Storage node, edit the file /etc/ntp.conf so the time is synchronized from a known, reliable time service: 
    # Enable writing of statistics records.
#statistics clockstats cryptostats loopstats peerstats 
server ntp1.addom.example.com
server 10.11.12.3
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    Activate the change on each Red Hat Gluster Storage node by stopping the ntp daemon, updating the time, then starting the ntp daemon. Verify the change on both servers using the following commands: 
    # service ntpd stop 
 
# service ntpd start
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  • Samba Packages

    Ensure to install the following Samba packages along with its dependencies:

    • CTDB
    • samba
    • samba-client
    • samba-winbind
    • samba-winbind-modules
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