Chapter 2. Installing an IdM server: With integrated DNS, with an integrated CA as the root CA
Chapter 2. Installing an IdM server: With integrated DNS, with an integrated CA as the root CA Installing a new Identity Management (IdM) server with integrated DNS has the following advantages: You can automate much of the maintenance and DNS record management using native IdM tools. For example, DNS SRV records are automatically created during the setup, and later on are automatically updated. You can configure global forwarders during the installation of the IdM server for a stable external internet connection. Global forwarders are also useful for trusts with Active Directory. You can set up a DNS reverse zone to prevent emails from your domain to be considered spam by email servers outside of the IdM domain. Installing IdM with integrated DNS has certain limitations: IdM DNS is not meant to be used as a general-purpose DNS server. Some of the advanced DNS functions are not supported. For more information, see DNS services available in an IdM server . This chapter describes how you can install a new IdM server with an integrated certificate authority (CA) as the root CA. Note The default configuration for the ipa-server-install command is an integrated CA as the root CA. If no CA option, for example --external-ca or --ca-less is specified, the IdM server is installed with an integrated CA. 2.1. Interactive installation During the interactive installation using the ipa-server-install utility, you are asked to supply basic configuration of the system, for example the realm, the administrator's password and the Directory Manager's password. The ipa-server-install installation script creates a log file at /var/log/ipaserver-install.log . If the installation fails, the log can help you identify the problem. Procedure Run the ipa-server-install utility. The script prompts to configure an integrated DNS service. Enter yes . The script prompts for several required settings and offers recommended default values in brackets. To accept a default value, press Enter . To provide a custom value, enter the required value. Warning Plan these names carefully. You will not be able to change them after the installation is complete. Enter the passwords for the Directory Server superuser ( cn=Directory Manager ) and for the Identity Management (IdM) administration system user account ( admin ). The script prompts for per-server DNS forwarders. To configure per-server DNS forwarders, enter yes , and then follow the instructions on the command line. The installation process will add the forwarder IP addresses to the IdM LDAP. For the forwarding policy default settings, see the --forward-policy description in the ipa-dns-install (1) man page. If you do not want to use DNS forwarding, enter no . With no DNS forwarders, hosts in your IdM domain will not be able to resolve names from other, internal, DNS domains in your infrastructure. The hosts will only be left with public DNS servers to resolve their DNS queries. The script prompts to check if any DNS reverse (PTR) records for the IP addresses associated with the server need to be configured. If you run the search and missing reverse zones are discovered, the script asks you whether to create the reverse zones along with the PTR records. Note Using IdM to manage reverse zones is optional. You can use an external DNS service for this purpose instead. Enter yes to confirm the server configuration. The installation script now configures the server. Wait for the operation to complete. After the installation script completes, update your DNS records in the following way: Add DNS delegation from the parent domain to the IdM DNS domain. For example, if the IdM DNS domain is idm.example.com , add a name server (NS) record to the example.com parent domain. Important Repeat this step each time after an IdM DNS server is installed. Add an _ntp._udp service (SRV) record for your time server to your IdM DNS. The presence of the SRV record for the time server of the newly-installed IdM server in IdM DNS ensures that future replica and client installations are automatically configured to synchronize with the time server used by this primary IdM server. 2.2. Non-interactive installation The ipa-server-install installation script creates a log file at /var/log/ipaserver-install.log . If the installation fails, the log can help you identify the problem. Procedure Run the ipa-server-install utility with the options to supply all the required information. The minimum required options for non-interactive installation are: --realm to provide the Kerberos realm name --ds-password to provide the password for the Directory Manager (DM), the Directory Server super user --admin-password to provide the password for admin , the Identity Management (IdM) administrator --unattended to let the installation process select default options for the host name and domain name To install a server with integrated DNS, add also these options: --setup-dns to configure integrated DNS --forwarder or --no-forwarders , depending on whether you want to configure DNS forwarders or not --auto-reverse or --no-reverse , depending on whether you want to configure automatic detection of the reverse DNS zones that must be created in the IdM DNS or no reverse zone auto-detection For example: After the installation script completes, update your DNS records in the following way: Add DNS delegation from the parent domain to the IdM DNS domain. For example, if the IdM DNS domain is idm.example.com , add a name server (NS) record to the example.com parent domain. Important Repeat this step each time after an IdM DNS server is installed. Add an _ntp._udp service (SRV) record for your time server to your IdM DNS. The presence of the SRV record for the time server of the newly-installed IdM server in IdM DNS ensures that future replica and client installations are automatically configured to synchronize with the time server used by this primary IdM server. Additional resources For a complete list of options accepted by ipa-server-install , run the ipa-server-install --help command. Failover, load-balancing, and high-availability in IdM .
ipa-server-install Do you want to configure integrated DNS (BIND)? [no]: yes Server host name [server.idm.example.com]: Please confirm the domain name [idm.example.com]: Please provide a realm name [IDM.EXAMPLE.COM]: Directory Manager password: IPA admin password: Do you want to configure DNS forwarders? [yes]: Do you want to search for missing reverse zones? [yes]: Do you want to create reverse zone for IP 192.0.2.1 [yes]: Please specify the reverse zone name [2.0.192.in-addr.arpa.]: Using reverse zone(s) 2.0.192.in-addr.arpa. Continue to configure the system with these values? [no]: yes ipa-server-install --realm IDM.EXAMPLE.COM --ds-password DM_password --admin-password admin_password --unattended --setup-dns --forwarder 192.0.2.1 --no-reverse