On Sun, 2008-11-16 at 00:19 +1100, Amos Shapira wrote:
> Hello,
>
> I'm looking for a way to replicate exact list of packages (including
> exact versions) from one CentOS 5 system to another.
>
> The trigger - I want to be able to "yum update" on my test/staging
> systems (mostly distro updates and security fixes), verify that
> nothing breaks with this updates, then do a *smart* "yum update" on
> the production servers which will force them to use exactly the same
> package versions which currently exist on the test system.
>
> On the CentOS users mailing list somebody suggested "rpm -qa", which
> looks good, it gives output like:
> setup-2.5.58-1.el5
> basesystem-8.0-5.1.1.el5.centos
> glibc-2.5-24
> chkconfig-1.3.30.1-2
> libsepol-1.15.2-1.el5
> libstdc++-4.1.2-42.el5
> elfutils-libelf-0.125-3.el5
> libgcrypt-1.2.3-1
> iptables-1.3.5-4.el5
> slang-2.0.6-4.el5
>
> So what's the best way to get this list to become the current state on
> another system? Is "xargs yum update < output-of-rpm-qa" enough?
> Should I use some mrepo (http://dag.wieers.com/home-made/mrepo/) magic
> to provide a repository with these exact list of yum packages and a
> "yum update" which uses this repository alone?
>
> What about deleted packages? How should I identify them and delete
> them? I supposed some shell scripting could find such packages.
>
> (PS - there was an excellent article with a title like "set
> manipulation using shell scripts" published not long ago, maybe posted
> here but I can't find it in the archives or my bookmarks, this could
> be useful for my last question).
>
> Are there tools which already exist to do something like this or will
> I have to role my own?
>
> Thanks,
>
> --Amos
I usually do the following: (Under both Fedora, CentOS and RHEL)
A. Installing the missing packages.
(On the source machine:)
$ rpm -qa --queryformat="%{NAME}-%{ARCH}\n" | sort > package_list.txt
(On the target machine:)
$ yum install -y $(cay package_list.txt)
B. Remove "extra" packages:
(On the target machine:)
$ rpm -qa --queryformat="%{NAME}-%{ARCH}\n" | sort > package_list_new.txt
$ yum remove $(diff package_list_new.txt package_list.txt | grep ">" | cut
-d">" -f2)
While I know that there are better ways of doing it (kickstart?) this
method requires the least effort on my end.
- Gilba
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