yahoo-eng-team team mailing list archive

[Zhigang Wang <w1z2g3@xxxxxxxxx>]

Public bug reported:

Currently cloud-init rhel distro selects FQDN over short hostname for set_hostname and 
update_hostneme. 

RHEL limits max hostname to 64 bytes by default:

    $ getconf HOST_NAME_MAX 
    64 

According to RFC 1035, the FQDN could up to 255 bytes. Setting hostname
to FQDN will fail if FQDN > 64 byets.

Normally the cloud will provide "local-hostname" in instance metadata,
which usually a short hostname. In sources/__init__.py get_hostname(),
we default FQDN to <local-hostname>.localdomain. If rhel set it as
hostname, then that's just wrong.

The proposal is to make rhel distro select shorter hostname over FQDN,
just as other distros. RHEL has its own preference, but not prohibiting
us doing improvement.

** Affects: cloud-init
     Importance: Undecided
         Status: New

** Patch added: "cloud-init-rhel-distro-select-hostname.patch"
   https://bugs.launchpad.net/bugs/1724414/+attachment/4974309/+files/cloud-init-rhel-distro-select-hostname.patch

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https://bugs.launchpad.net/bugs/1724414

Title:
  rhel distro selects FQDN as hostname

Status in cloud-init:
  New

Bug description:
  Currently cloud-init rhel distro selects FQDN over short hostname for set_hostname and 
  update_hostneme. 

  RHEL limits max hostname to 64 bytes by default:

      $ getconf HOST_NAME_MAX 
      64 

  According to RFC 1035, the FQDN could up to 255 bytes. Setting
  hostname to FQDN will fail if FQDN > 64 byets.

  Normally the cloud will provide "local-hostname" in instance metadata,
  which usually a short hostname. In sources/__init__.py get_hostname(),
  we default FQDN to <local-hostname>.localdomain. If rhel set it as
  hostname, then that's just wrong.

  The proposal is to make rhel distro select shorter hostname over FQDN,
  just as other distros. RHEL has its own preference, but not
  prohibiting us doing improvement.

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