on 4-9-2009 9:01 AM Robert Heller spake the following: > At Thu, 09 Apr 2009 10:38:08 -0500 CentOS mailing list <centos-IFYaIzF+flcdnm+yROfE0A at public.gmane.org> wrote: > >> Robert Heller wrote: >>> At Thu, 09 Apr 2009 07:49:30 -0400 CentOS mailing list <centos-IFYaIzF+flcdnm+yROfE0A at public.gmane.org> wrote: >>> >>>> What is the rule of thumb for reboots after updates... >>>> >>>> Certainly if I update from 5.2 to 5.3 I reboot. >>>> >>>> But if you update something like krb5 or pam >>>> does that require a reboot? Does the "fix" get automatically loaded and used >>>> or do you just do a reboot always? >>> You only *really* need to reboot if/when you update the kernel. Yum/RPM >>> takes care of restarting daemons, etc. during the update process. This >>> is NOT MS-Windows.... >> Yes, but any program that is already running will keep using the old >> versions of the program, libraries, open files, etc., retaining the disk >> space and not sharing the in-memory copy with new instances that start >> after the update. And since modern programs like to dynamically load >> library modules as needed while running you can get a strange mix of >> old/new versions running at once. > > Generally, this is not as bad as it seems. In some cases, some updates > do restart critical daemons (rpm -hUv glibc... will restart sshd for > example). Also, since most critical library updates also imply a similar > update for the deamons/programs that use those libraries and since the > rpms for the deamon programs do restart the deamon they install/update, > in most cases the deamons do get restarted at some point during the > update process -- that is, since httpd (Apache) depends on apr and when apr > gets a critical update, it is very likely that the httpd program would > also be rebuilt as well, so that both rpms are updated in the repo. A > 'yum update' will install the new apr rpm, then the new httpd rpm and at > that point restart httpd, this picking up the new apr library. > > Sometimes you just have to know your system. Like if you update a sendmail milter, you would need to restart sendmail also, but if the rpm developer didn't write that into the %post section you would want to do it yourself. -------------- next part -------------- A non-text attachment was scrubbed... Name: signature.asc Type: application/pgp-signature Size: 258 bytes Desc: OpenPGP digital signature URL: <http://lists.centos.org/pipermail/centos/attachments/20090409/ddc393c3/attachment-0005.sig>