[Bug 871966] Re: FQDN written to /etc/hosts causes problems for clustering systems

[Scott Moser]

** Description changed:

  *** Ubuntu 11.10 Release Note ***
  
  Cloud instances and servers pre-seeded with cloud-init will have their
  FQDN written to /etc/hosts and pointed to the IP 127.0.1.1. This may
  cause issues for daemons which try to listen on their hostname, rather
  than 0.0.0.0, as they will now only be reachable locally, rather than on
  the network address that their FQDN resolves to.
  
  ***
  
- 
- By writing the FQDN to /etc/hosts as resolving to 127.0.1.1, systems like Cassandra have a much harder time determining their address to communicate to other cluster members.
+ By writing the FQDN to /etc/hosts as resolving to 127.0.1.1, systems
+ like Cassandra have a much harder time determining their address to
+ communicate to other cluster members.
  
  While some might see communicating your IP to others as  a bug, being
  able to use gethostname() and then resolving it to get the actual IP
  address of one's machine is fairly important.
  
  Its my understanding that in resolving bug #802637 , the Debian
  networking docs were used as a guide:
  
  http://www.debian.org/doc/manuals/debian-reference/ch05.en.html
  Point 5.1.2 specifically.
  
  It does suggest that one needs an FQDN in /etc/hosts.
  
  However cloud-init should only set the addresss if it cannot be
  determined.
  
  cloud-init should first try gethostbyname() on the FQDN. If it resolves,
  *do not write FQDN to /etc/hosts*. This assures that if it has been
  configured to be resolvable by some method in nsswitch.conf such as DNS
  or NIS or etc., it will not be overidden by /etc/hosts.
+ 
+ 
+ related bugs:
+  bug 890501: EC2 cloud-init overwrites 127.0.1.1 in /etc/hosts on every reboot

** Also affects: cloud-init
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/871966

Title:
  FQDN written to /etc/hosts causes problems for clustering systems

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