Good synchronisation strategies (especially for the users and
ml.diespammer at netfence.it
Wed Feb 14 10:18:17 UTC 2007
Olaf Greve wrote:
> However, I seem to recall (not sure, anymore though) having heard and/or
> read (here, perhaps?) that there are better ways to synchronise than
> using rsync...
I guess you might have heard of ggated (8) & Co. This is quite different
from rsync and might or might not be suited to your needs and
configuration. It's more like ghosting in some way and you'll need a
dedicated partition for our data.
Also, AFAIK, you should not mount your data unless you know the other
server failed or both are mounting this data read-only.
I never tested this myself, anyway.
What is best for you depends much on how you access your data. Is it
read-only or read/write?
> Also, I'd like to be able to
> (safely!) automatically synchronise users and groups that I may
> add/change/delete on the live server.
I'm using OpenLDAP and nss_ldap for that. Works very well, in that
syncronization is virtually immediate.
There are some caveats and this will introduce another possible point of
> Regarding the data, the machine is mainly used as a webserver, running
> PHP, MySQL and some other things.
WRT webserver data, it's just plain files, so it falls in the previous
case. You should look for application level replication for databases.
I don't think PHP matters, but I can't really tell without knowing what
you really have. Same goes for "some other things".
> 1) Is rsync a good way to go, or are there better ways to do this?
See above, might be, might be not.
> 2) Regarding synching of user and group data: are there special ways to
> do this (i.e. including automatic creation of homedirectories etc.), or
> does one simply manually have to sync the users and groups files (and
> the user directories)?
See above for user and groups; home directories again fall into the
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