[Bug 1644009] Re: /etc/hosts ::1 line should additionally include 'localhost'

[Dan Watkins]

Confirmed in trusty, xenial and zesty.  ({t,x,z}-ipv6 are just
containers launched from the latest images)

$ lxc exec t-ipv6 cat /etc/hosts
127.0.0.1 localhost

# The following lines are desirable for IPv6 capable hosts
::1 ip6-localhost ip6-loopback
fe00::0 ip6-localnet
ff00::0 ip6-mcastprefix
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters
ff02::3 ip6-allhosts


$ lxc exec x-ipv6 cat /etc/hosts
127.0.0.1 localhost

# The following lines are desirable for IPv6 capable hosts
::1 ip6-localhost ip6-loopback
fe00::0 ip6-localnet
ff00::0 ip6-mcastprefix
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters
ff02::3 ip6-allhosts


$ lxc exec z-ipv6 cat /etc/hosts
127.0.0.1 localhost

# The following lines are desirable for IPv6 capable hosts
::1 ip6-localhost ip6-loopback
fe00::0 ip6-localnet
ff00::0 ip6-mcastprefix
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters
ff02::3 ip6-allhosts

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https://bugs.launchpad.net/bugs/1644009

Title:
  /etc/hosts ::1 line should additionally include 'localhost'

Status in livecd-rootfs package in Ubuntu:
  New

Bug description:
  RFC 6761 6.3 requires that "localhost" (and variations) resolve to
  127.0.0.1 or ::1 for IPv4 and IPv6, respectively.

  In instances that are installed with D-I (such as the server ISO), I
  see:

  ::1     localhost ip6-localhost ip6-loopback

  However, in our cloud-images (or derivatives such as LXD), OR in
  Ubiquity installations, I see:

  ::1 ip6-localhost ip6-loopback

  My examples are from Xenial.

  The latter examples, should be fixed up to include localhost for IPv6
  per RFC guidance.

  Opening bug here per IRC conversation with Steve Langasek.

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