On 2010/09/02 10:39 PM, Stephen Harris wrote: > On Thu, Sep 02, 2010 at 10:29:35PM +0200, Rudi Ahlers wrote: >> On 2010/09/02 07:39 PM, Stephen Harris wrote: >>> Indeed. At my place we reboot production machines every 90 days. Or >>> are meant to; I don't think management have worked out that rebooting >>> 10,000 machines every 90 days means a lot of reboot activity!! >>> >>> (The idea being to verify that services will come up after some form >>> of DC-wide outage; last think we want in a "business contingency" situation >>> is a few hundred servers not working properly 'cos the rc scripts are >>> broken) >> Interesting..... This generally won't happen on a rock solid OS like >> CentOS, unless someone really screwed up badly or it's a super-custom >> build which can't be updated using normal CentOS repositories. >> >> We don't reboot servers (CentOS at least), unless we really really need >> to. For minor kernel updates that doesn't give much more than what we >> need we don't reboot either. Only for more critical / major / highly >> important kernel updates, or hardware upgrades do we reboot. > You never upgrade the application? The database? Make config changes? > Wow... to live in such a static world :-) > > Most of our problems aren't OS related, they're app or config > related... "change shared memory parameters for oracle", "start this at > boot time", "add new network interface"... these all may prevent the > server from booting cleanly and aren't the OS's fault. You don't want to > find that out during a crisis scenario! > We do shared webhosting mainly so only really use Apache, Exim, MySQL, PostGreSQL, etc. So I guess it's not as "enterprise" as your situation but with hundreds of thousands of files on every server, being updated on a regular basis I do think that our servers fall in the same category. But then again we only use STABLE release software where possible. And I honestly haven't come across an issue where an rc script doesn't work properly after reboot. I've had cased where a kernel didn't work as expected though, but we don't reboot a server every 2 months to see if the kernel might have failed. -- Kind Regards Rudi Ahlers, SoftDux MD Website: http://www.SoftDux.com Blog: http://Blog.SoftDux.com Support: http://Billing.SoftDux.com Office: 087 805 9573 Cell: 082 554 7532 Fax: 086 609 6128 -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.centos.org/pipermail/centos/attachments/20100902/ef2d95cf/attachment-0005.html>