After discussing with Scott Moser, its agreed that this may cause
issues, but not necessarily that it is a "bug" as much as a change in
behavior that needs documenting. Adding a ubuntu-release-notes task with
suggested release note.
** Changed in: cassandra (juju Charms Collection)
Status: New => In Progress
** Changed in: cassandra (juju Charms Collection)
Assignee: (unassigned) => James Page (james-page)
** Changed in: cloud-init (Ubuntu)
Importance: Undecided => Low
** Also affects: ubuntu-release-notes
Importance: Undecided
Status: New
** Description changed:
- 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.
+ *** 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.
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.
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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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