EC2 cloud-init overwrites 127.0.1.1 in /etc/hosts on every reboot
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
cloud-init |
Fix Released
|
Medium
|
Scott Moser | ||
cloud-init (Ubuntu) |
Fix Released
|
Medium
|
Unassigned |
Bug Description
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-
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
ProcVersionSign
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)
Ec2Availability
Ec2InstanceType: t1.micro
Ec2Kernel: aki-805ea7e9
Ec2Ramdisk: unavailable
PackageArchitec
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
Related branches
- Chad Smith (community): Needs Fixing
- Hannes: Pending requested
-
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tests/unittests/test_util.py (+0/-489)
tests/unittests/test_vmware_config_file.py (+0/-103)
tools/21-cloudinit.conf (+0/-6)
tools/Z99-cloud-locale-test.sh (+0/-98)
tools/build-on-freebsd (+0/-66)
tools/ccfg-merge-debug (+0/-90)
tools/cloud-init-per (+0/-60)
tools/hacking.py (+0/-170)
tools/make-dist-tarball (+0/-21)
tools/make-mime.py (+0/-60)
tools/make-tarball (+0/-39)
tools/mock-meta.py (+0/-454)
tools/motd-hook (+0/-35)
tools/read-dependencies (+0/-29)
tools/read-version (+0/-26)
tools/run-pep8 (+0/-22)
tools/run-pyflakes (+0/-18)
tools/run-pyflakes3 (+0/-2)
tools/tox-venv (+0/-42)
tools/uncloud-init (+0/-141)
tools/validate-yaml.py (+0/-25)
tools/write-ssh-key-fingerprints (+0/-38)
tox.ini (+0/-35)
udev/66-azure-ephemeral.rules (+0/-18)
udev/79-cloud-init-net-wait.rules (+0/-10)
udev/cloud-init-wait (+0/-70)
upstart/cloud-config.conf (+0/-9)
upstart/cloud-final.conf (+0/-10)
upstart/cloud-init-blocknet.conf (+0/-83)
upstart/cloud-init-container.conf (+0/-57)
upstart/cloud-init-local.conf (+0/-16)
upstart/cloud-init-nonet.conf (+0/-66)
upstart/cloud-init.conf (+0/-9)
upstart/cloud-log-shutdown.conf (+0/-19)
- JJ Asghar: Pending requested
- Diff: 0 lines
- Scott Moser: Pending requested
-
Diff: 3061 lines (+2239/-175)39 files modifiedChangeLog (+39/-9)
cloud-init.py (+31/-1)
cloudinit/CloudConfig/__init__.py (+1/-1)
cloudinit/CloudConfig/cc_apt_pipelining.py (+53/-0)
cloudinit/CloudConfig/cc_ca_certs.py (+3/-1)
cloudinit/CloudConfig/cc_chef.py (+5/-5)
cloudinit/CloudConfig/cc_landscape.py (+5/-0)
cloudinit/CloudConfig/cc_resizefs.py (+31/-12)
cloudinit/CloudConfig/cc_salt_minion.py (+2/-1)
cloudinit/CloudConfig/cc_update_etc_hosts.py (+1/-1)
cloudinit/DataSource.py (+4/-1)
cloudinit/DataSourceCloudStack.py (+92/-0)
cloudinit/DataSourceConfigDrive.py (+231/-0)
cloudinit/DataSourceEc2.py (+2/-84)
cloudinit/DataSourceMAAS.py (+345/-0)
cloudinit/DataSourceNoCloud.py (+75/-2)
cloudinit/DataSourceOVF.py (+1/-1)
cloudinit/SshUtil.py (+2/-0)
cloudinit/UserDataHandler.py (+2/-2)
cloudinit/__init__.py (+44/-9)
cloudinit/netinfo.py (+5/-5)
cloudinit/util.py (+253/-30)
config/cloud.cfg (+3/-1)
debian.trunk/control (+1/-0)
doc/configdrive/README (+118/-0)
doc/examples/cloud-config-chef-oneiric.txt (+90/-0)
doc/examples/cloud-config-chef.txt (+48/-6)
doc/examples/cloud-config-datasources.txt (+18/-0)
doc/examples/cloud-config.txt (+11/-0)
doc/kernel-cmdline.txt (+48/-0)
doc/nocloud/README (+55/-0)
setup.py (+1/-0)
tests/unittests/test__init__.py (+242/-0)
tests/unittests/test_datasource/test_maas.py (+153/-0)
tests/unittests/test_handler/test_handler_ca_certs.py (+4/-0)
tests/unittests/test_userdata.py (+107/-0)
tests/unittests/test_util.py (+18/-2)
tools/Z99-cloud-locale-test.sh (+92/-0)
tools/run-pylint (+3/-1)
description: | updated |
description: | updated |
description: | updated |
description: | updated |
description: | updated |
Changed in cloud-init (Ubuntu): | |
status: | Incomplete → Invalid |
description: | updated |
Changed in cloud-init (Ubuntu): | |
importance: | Undecided → Medium |
Changed in cloud-init: | |
importance: | Undecided → Medium |
Changed in cloud-init: | |
status: | Fix Committed → Fix Released |
Thanks for the bug report.
I believe that you should be able to simply add an entry above the one labeled 'cloud-init'
$ grep -v :: /etc/hosts brickies. net superman
127.0.0.1 localhost
127.0.1.2 superman.
# The following lines are desirable for IPv6 capable hosts 231-182. ec2.internal ip-10-212-231-182 brickies. net brickies. net -q brickies. net (127.0.1.2) 56(84) bytes of data.
# Added by cloud-init
127.0.1.1 ip-10-212-
$ cat /etc/hostname
superman
$ hostname -f
superman.
$ ping -c 1 superman.
PING superman.
--- superman. brickies. net ping statistics --- 028/0.028/ 0.000 ms
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 0.028/0.