Martijn Koster created CLOUDSTACK-4556:
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Summary: "12.10. Creating a Linux Template" sethostname script
problems
Key: CLOUDSTACK-4556
URL: https://issues.apache.org/jira/browse/CLOUDSTACK-4556
Project: CloudStack
Issue Type: Bug
Security Level: Public (Anyone can view this level - this is the default.)
Components: Doc
Affects Versions: 4.1.1
Reporter: Martijn Koster
In the nightly build doc
http://jenkins.cloudstack.org/view/master/job/build-docs-admin-master/lastSuccessfulBuild/artifact/Apache_CloudStack-4.2.0-Admin_Guide-en-US.pdf
section "12.10. Creating a Linux Template", there is a sethostname script,
which has several issues:
The script appears to assume that it is called once, and that at that time the
dhcp leases file has info in it.
What I've seen happen is that the first time it is invoked, the leases file is
empty, and the script then destroys
/etc/hosts and /etc/hostname because it does no checking, and the second time
when the leases file has the required info, the hostname is no longer
"localhost", so the script is skipped. And this approach is strange anyway: the
script goes through effort to extract values from the leases file, but it
doesn't need to -- they are passed in by dhclient.
It calls "dpkg-reconfig" on
https://github.com/apache/cloudstack/blob/922ef76224d4a8534f67f47b97cf664e5c65ecba/docs/en-US/prepare-linux-template.xml#L104,
which should be "dpkg-reconfigure" on my ubuntu 12.04 instance:
{noformat}
root@test3:~# which dpkg-reconfig
root@test3:~# which dpkg-reconfigure
/usr/sbin/dpkg-reconfigure
root@test3:~# uname -a
Linux test3 3.5.0-23-generic #35~precise1-Ubuntu SMP Fri Jan 25 17:13:26 UTC
2013 x86_64 x86_64 x86_64 GNU/Linux
{noformat}
It would also be nice to set DEBIAN_FRONTEND=noninteractive such that
dpkg-reconfigure doesn't cause debconf frontend warnings in the log.
In
https://github.com/apache/cloudstack/blob/922ef76224d4a8534f67f47b97cf664e5c65ecba/docs/en-US/prepare-linux-template.xml#L108
it sets user/group execute permissions for the script, but that is not
required. dhclient-script(8) documents "invoked using the ´.´ command", and the
other scripts in the /etc/dhcp/dhclient-exit-hooks.d/ directory have mode 644.
I'm working on an alternative in https://gist.github.com/makuk66/6379642, which
appears to work but could do with some more testing.
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