红帽全球峰会1.2. How IdM ensures that global forwarders from /etc/resolv.conf are not removed by NetworkManager
Installing Identity Management (IdM) with integrated DNS configures the /etc/resolv.conf file to point to the 127.0.0.1 localhost address:
# Generated by NetworkManager
search idm.example.com
nameserver 127.0.0.1
In certain environments, such as networks that use Dynamic Host Configuration Protocol (DHCP), the NetworkManager service may revert changes to the /etc/resolv.conf file. To make the DNS configuration persistent, the IdM DNS installation process also configures the NetworkManager service in the following way:
The DNS installation script creates an
/etc/NetworkManager/conf.d/zzz-ipa.confNetworkManagerconfiguration file to control the search order and DNS server list:# auto-generated by IPA installer [main] dns=default [global-dns] searches=$DOMAIN [global-dns-domain-*] servers=127.0.0.1-
The
NetworkManagerservice is reloaded, which always creates the/etc/resolv.conffile with the settings from the last file in the/etc/NetworkManager/conf.d/directory. This is in this case thezzz-ipa.conffile.
重要
Do not modify the /etc/resolv.conf file manually.
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