** 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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