Description of problem: After installing RH 6.8 via kickstart and entering a new hostname (that does not resolve in DNS) via the "DNS configuration" text UI (system-config-network-tui) on first boot after install, the resulting /etc/hosts file is missing the "localhost" alias for 127.0.0.1


Version-Release number of selected component (if applicable):
system-config-network-tui-1.6.0.el6.3-4.el6.noarch

How reproducible:
100%

Steps to Reproduce:
1. Install 6.8 (text mode) via Kickstart
2. On firstboot text screen, select "DNS configuration", enter a hostname that does not resolve to anything in DNS, then Save&Continue
3. Check /etc/hosts file, the entered hostname has been added as an alias for 127.0.0.1 but the "localhost" alias is now missing

Actual results:

/etc/hosts has 127.0.0.1 with the specified hostname but not the "localhost" alias

Expected results:

/etc/hosts should have 127.0.0.1 with the specified hostname AND "localhost" as an alias


Additional info:

This would appear to be a regression from 6.7, repeating the same procedure with a RH 6.7 install yields an /etc/hosts with the "localhost" alias as expected.

Also important to note is that the IP address (either DHCP or static) assigned to the host must not reverse lookup to a valid name in DNS AND the hostname entered in the DNS config must also be unresolvable, otherwise everything appears to work (probably because system-config-network doesn't need to modify /etc/hosts at all to insert an alias for the specified hostname?)

Finally, if you run system-network-config *after* firstboot and change to any host name (resolvable or unresolvable in DNS), then it does appear to restore the "localhost" alias to /etc/hosts.  So not sure if this problem is related to something with the firstboot steps?

Please LMK if you require any additional info.

thanks!