[CentOS] re-install package

JohnS jses27 at gmail.com
Thu Apr 16 10:30:09 UTC 2009


On Thu, 2009-04-16 at 15:10 +0800, D Tucny wrote:
> 2009/4/16 John Thomas <gmane-2006-04-16 at jt-socal.com>
>         Scott Silva wrote:
>         > And the right repositories have to be online!
>         
>         
>         Finally, a successful commercial repository.
> 
> It's not without it's problems though, especially when using yum...
> Blindly playing with this repository can be bad for your system's
> health, plenty of care and attention is required...
> 
> The packages require quite a bit of ongoing maintence once installed
> and not all versions are stable... The packages don't tend to carry
> much documentation, the reported requirements are not always accurate
> and the package clean up routines are never complete...
> 
> yum update girlfriend doesn't typically work too well if a prior
> version is already installed, newer versions get installed then a
> cleanup happens afterwards, race conditions exist where the previous
> version can do lots of bad things to your system while both versions
> are effectively installed at the same time... a yum remove girlfriend
> before a fresh yum install girlfriend is recommended... Care should
> still be taken as yum will attempt to honour the package dependancies
> and other packages such as pet, house and car could be removed when
> trying to remove girlfriend, especially if any of those were installed
> after girlfriend and more so if it was requires of the girlfriend
> package that triggered their installation... Typically there are
> significant system reconfigurations required to support each new
> version... yum reinstall doesn't always work too well with girlfriend,
> the package does tend to leave quite a bit of state information in
> place, even after uninstall, which, if this is the cause of the
> problems, won't be fixed by a reinstall...
> 
> An upgrade of girlfriend to wife exists, it's not cheap though and
> potentially can require some major system reconfiguration to
> support... yum can't really handle this, often getting confused
> between the option of upgrading to wife or updating to a later release
> of girlfriend... The upgrade to wife can be forced in certain
> situations such as if any child packages have been accidentally
> installed, such as by automatic overnight updates...
> 
> With wife installed, yum will let you install additional versions of
> girlfriend, but, this is not a recommended configuration as there are
> some very serious interoperability issues, especially if an
> installation of girlfriend pulls in a child update... In that
> situation, yum would try to upgrade girlfriend to wife, but, as you
> can't, in a standard configuration, have multiple instances of wife
> and newer versions of wife obsolete older versions, the old version
> would need to be removed, the massive number of unresolvable
> dependancies involved in the that would cause yum to crash... The only
> solution is to use rpm with varying force and nodeps options to
> attempt to get your system functional again, though even then, bits of
> old packages will still be lying around consuming resources,
> especially if child packages exist...
> 
> So, while the packages can work, there is quite a bit of work involved
> in fully integrating them and maintaining them... yum can be used,
> but, it's probably best to exclude them in yum.conf and manually
> install and update the packages where you find necessary, taking great
> care in avoiding conflicts and managing dependancies... The extra care
> taken in doing it manually can really pay off in long term system
> stability... 
---
Very Interesting :-) You have to much time...



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