[CentOS-mirror] Mirror Changes - Important
lance at uklinux.net
Wed Mar 30 20:42:11 UTC 2005
Due to the split of mirrors with cAos , it will be necessary for mirrors
to make some changes to the way that they mirror the CentOS tree, as
moving forward it will no longer be a part of the caosity tree.
Firstly mirrors need to decide whether they are mirroring CentOS or cAos
or both. They are distinct operating systems, CentOS is a rebuild of
Enterprise Linux , whereas cAos is an rpm based distribution in its own
For more information see www.centos.org or caos.caosity.org
At present both trees are mirrored with a single rsync of
mirror.caosity.org::cAos - moving forward two rsyncs will be needed :-
mirror.caosity.org::caosity that will get the caos tree
msync.centos.org::CentOS that will get the CentOS tree
Please note that at present CentOS will be listed and stored within the
cAos tree, this should not be the case in the future - CentOS should never
be stored or listed as a part of cAos or caosity.
In order to achieve the changes required with minimum download bandwidth
the following steps should be carried out. (Note that individual
circumstances may vary - if in doubt do nothing and ask) .
1. Stop cron based rsync job from syncing
2. Move the CentOS tree to its new location, which should be at the root
of the publically served tree.
This can either be achieved with 'mv' or if you want a 2nd chance at it
'cp -al' which will create a hardlinked copy of the tree (as long as it
is on the same partition)
eg with directory structure /pub
cp -al /pub/caos/centos /pub/
mv /pub/caos/centos /pub
to end up with /pub/
(and /pub/caos/centos/ if using cp -al)
3. Create a new rsync cron job to sync the CentOS tree (if required) .
This should be something like :-
rsync -aqzH --delete msync.centos.org::CentOS /pub/
*** note the change to msync.centos.org *** mirror.centos.org is
deprecated for rsync use - to allow us to use different servers for yum
please use rsync -anvzH --delete msync.centos.org::CentOS /pub/
first to test that the command will do the right thing ('n' is dry run
and will just show what wil be transferred - which in theory should be very
little - if it says 40 GB + then the command is wrong !!)
Note that due to the way that rsync works any updates will only be written
to this new tree and not the hardlinked tree left behind if using cp -al
above ( that can be deleted once you are happy with the new location
4. Create a new rsync cron job to sync the cAos tree (if required). This
should be something like :-
rsync -aqzH --delete mirror.caosity.org::caosity /pub/
*** note the change to ::caosity - ::cAos will still sync both trees
for mirrors that havent restructured yet. ***
This will also delete the CentOS tree left underneath the caos tree
You should now have both trees in the correct places.
5. Please email the list to say that you have restructured your mirror and
what the new urls will be for public use. We will update the databases to
reflect these new locations.
6. It is not necessary to mirror all of centos if you do not wish to - eg
you can choose whether to carry 2.1 , 3.3, 3.4, 4.0 - but please note in
the email any trees that you will not be carrying and we will note that in
7. In the very near future we will be restricting access to
msync.centos.org to publically listed mirrors only - we have to establiush
a way for new mirrors to sync first though.
8. We will be tracking which mirrors have/havent restructured and will
contact individual mirrors accordingly.
There is now an irc channel - #centos-mirror
on irc.freenode.net where mirroring discussions may be held.
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