** Description changed:
When running an EC2 instance of Ubuntu 11.10 Oneiric, cloud-init sets up
/etc/hosts with a default value for 127.0.1.1 looking something like:
127.0.1.1 ip-10-202-61-233.ec2.internal ip-10-202-61-233
I edit /etc/hosts to change this value to something that makes more
sense to my internal software (e.g., Apache). For example:
127.0.1.1 myhost.example.com myhost
BUG: Whenever I reboot the EC2 instance, cloud-init overwrites my
important settings of this value back to the old default. This breaks
the startup of my applications on the server as they expect to be able
to resolve the names I want set in the /etc/hosts file. My web server
never comes up after a simple reboot.
Once the user edits the value for 127.0.1.1 in the /etc/hosts file, it
should never be overwritten. Not on a reboot. Not on a stop/start
(which assigns new IP addresses). Not even when an AMI is built out of
this instance and a new instance is run.
The user changed that value to something they cared about with reasons
we can't assume to trump. It should be left alone.
If /etc/hosts does not exist or if 127.0.1.1 is still the same value
that cloud-init last set it to, then it *might* be acceptable to
overwrite it with a value based on a change in the private IP address,
HOWEVER, this might still break the application if software configured
itself using the old value.
Either never change the value if it exists, or store elsewhere the value
that was initially set and only change it if it is still the same.
See also bug #371936 where a similar bug was fixed back in 2009. Figure
out if there is some reason that this part of the system is fragile and
prone to breaking.
ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: cloud-init 0.6.1-0ubuntu22
ProcVersionSignature: User Name 3.0.0-12.20-virtual 3.0.4
Uname: Linux 3.0.0-12-virtual i686
ApportVersion: 1.23-0ubuntu3
Architecture: i386
Date: Tue Nov 15 00:17:46 2011
Ec2AMI: ami-a7f539ce
Ec2AMIManifest: (unknown)
Ec2AvailabilityZone: us-east-1d
Ec2InstanceType: t1.micro
Ec2Kernel: aki-805ea7e9
Ec2Ramdisk: unavailable
PackageArchitecture: all
ProcEnviron:
LANG=en_US.UTF-8
SHELL=/bin/bash
SourcePackage: cloud-init
UpgradeStatus: No upgrade log present (probably fresh install)
+
+ related bugs:
+ * bug 871966: FQDN written to /etc/hosts causes problems for clustering
systems
** Also affects: cloud-init
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/890501
Title:
EC2 cloud-init overwrites 127.0.1.1 in /etc/hosts on every reboot
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