Date: Sun, 24 Jan 1999 15:50:09 -0800 (PST) From: Matthew Dillon <dillon@apollo.backplane.com> To: "Jordan K. Hubbard" <jkh@zippy.cdrom.com> Cc: John Birrell <jb@cimlogic.com.au>, peter@netplex.com.au (Peter Wemm), nsouch@teaser.fr, cvs-committers@FreeBSD.ORG Subject: Re: CVS totally broken on freefall Message-ID: <199901242350.PAA05539@apollo.backplane.com> References: <1427.917220014@zippy.cdrom.com>
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:> This is a *VERY* good example of what not to do on a production system.
:> People should know better. Grrr.
:
:You know of a better way of upgrading machines? If so, tell me now
:before we do hub. :)
:
:I don't have full spares for each, so I can't do the old roll-over
:from a hot spare trick. If this were a commercial shop I'd have one
:or two super-spares in the corner, sure, but project funds are not
:quite so abundant. :)
:
:- Jordan
Your machines probably aren't configured to make upgrades easy, but
basically what you do is have a template machine. This machine has
the 'new' release fully installed, plus has a directory tree containing
compatible old-release binaries and libraries. You NFS export this
machine's /, /usr, /old/root, and /old/usr
On each machine you wish to upgrade you do the following:
(1) mount from the template machine:
/old/root
/old/usr
/new/root
/new/usr
(2) re-ldconfig and re-path such that the only libraries you access
are from /old/usr/lib and the only binaries you run are from
/old/*.
(3) Get rid of any unnecessary services.
(4) start copying. Write a script to copy the stuff from
/new/root and /new/usr to / and /usr
( at BEST we basically had a static / and /usr and so we could
just mirror them minus our /conf/ME softlink which pointed to
/conf/<hostname> depending on which machine it was )
NOTE: you can't just copy binaries and libraries, not unless you
want to seg-fault the system ( sshd, tcsh, sh, etc... ). Instead,
cp to filename.NEW and then mv -f ( rename over ).
You probably have major customizations in / and /usr for each
of your machines, so you have to be more careful.
(5) Get the machine into shape. Install the new kernel and loader,
new bootblocks, reboot.
(6) Once the machine is up in its new configuration, you can do a
full make buildworld / installworld without worrying about
compatibility problems. Hell, if you did the copy right, you
do not even have to do this.
The other cool thing is, of course, that since you are using NFS mounts
you can put the script to do all of this in one place: on the template
machine.
-Matt
Matthew Dillon
<dillon@backplane.com>
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