Hello,
I am getting a new computer and am going to need to move the files from the old to the new. What is the best way to do this?
Should I install CentOS from scratch on the new computer then move the directories I need? How do I maintain permissions if this is the best way?
TIA
Eddie
-----Original Message----- From: Thomas E Dukes edukes@alltel.net To: CentOS centos@centos.org Sent: Sun, 5 Mar 2006 09:34:37 -0500 Subject: [CentOS] Moving files to new server
Hello,
I am getting a new computer and am going to need to move the files from the old to the new. What is the best way to do this?
Should I install CentOS from scratch on the new computer then move the directories I need? How do I maintain permissions if this is the best way?
------------------------------------------------------------------------- ----------------- If you install centos on the new comp, create users on the new comp with the same user name and user ID as on the old one(you can refer to /etc/passwd for UID). Plug the HDD of the new comp to the old linux machine Create a folder, say "NewHDD" in /mnt Mount the new HDD partition (where you want your data to be copied to) to /mnt/NewHDD Use the cp command as root with --preserve[=ATTR_LIST] option to copy the files from their old(old HDD) location to new location(on the new HDD). Refer to man cp for more info about cp options. Hope it help Thai
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-----Original Message----- From: centos-bounces@centos.org [mailto:centos-bounces@centos.org] On Behalf Of lnthai2002@aim.com Sent: Sunday, March 05, 2006 9:52 AM To: centos@centos.org Subject: Re: [CentOS] Moving files to new server
-----Original Message----- From: Thomas E Dukes edukes@alltel.net To: CentOS centos@centos.org Sent: Sun, 5 Mar 2006 09:34:37 -0500 Subject: [CentOS] Moving files to new server
Hello,
I am getting a new computer and am going to need to move the files from the old to the new. What is the best way to do this?
Should I install CentOS from scratch on the new computer then move the directories I need? How do I maintain permissions if this is the best way?
If you install centos on the new comp, create users on the new comp with the same user name and user ID as on the old one(you can refer to /etc/passwd for UID). Plug the HDD of the new comp to the old linux machine Create a folder, say "NewHDD" in /mnt Mount the new HDD partition (where you want your data to be copied to) to /mnt/NewHDD Use the cp command as root with --preserve[=ATTR_LIST] option to copy the files from their old(old HDD) location to new location(on the new HDD). Refer to man cp for more info about cp options. Hope it help Thai
Thanks for your reply.
I can see that this is not going to be easy any way I do it. I was also thinking of backing up the old system, install a fresh CentOS on the new, then do a restore on it. Would that work? I just want to make sure I have everthing on the new as the old.
Thanks
Thomas E Dukes wrote:
Hello,
I am getting a new computer and am going to need to move the files from the old to the new. What is the best way to do this?
Should I install CentOS from scratch on the new computer then move the directories I need? How do I maintain permissions if this is the best way?
If you have the luxury of having both machines online at the same time, why not just use the easy way out and use rsync? Or as someone else suggested, you could physically attach the new drive to the old computer and copy the data to to it with any number of tools (tar/dump/cp/etc....).
Cheers,
-----Original Message----- From: centos-bounces@centos.org [mailto:centos-bounces@centos.org] On Behalf Of Chris Mauritz Sent: Sunday, March 05, 2006 10:08 AM To: CentOS mailing list Subject: Re: [CentOS] Moving files to new server
Thomas E Dukes wrote:
Hello,
I am getting a new computer and am going to need to move the files from the old to the new. What is the best way to do this?
Should I install CentOS from scratch on the new computer
then move the
directories I need? How do I maintain permissions if this
is the best way?
If you have the luxury of having both machines online at the same time, why not just use the easy way out and use rsync? Or as someone else suggested, you could physically attach the new drive to the old computer and copy the data to to it with any number of tools (tar/dump/cp/etc....).
Cheers,
I can put both online but have never used rsync nor dump. The old pc is old! A P3-450, 18GB HD. The new one is a P4-3.0Ghz with 1GB ram. The way CentOS will do the partitions will probably be different than from the old, especially the SWAP. The old system has been upgraded numerous times since RedHat 8.0. I like the idea of a fresh install but want to make sure I have everything working on the new without missing something I installed on the old one.
Decisions, decisions.............
Thanks
On Sun, 2006-03-05 at 10:20 -0500, Thomas E Dukes wrote:
-----Original Message----- From: centos-bounces@centos.org [mailto:centos-bounces@centos.org] On Behalf Of Chris Mauritz Sent: Sunday, March 05, 2006 10:08 AM To: CentOS mailing list Subject: Re: [CentOS] Moving files to new server
Thomas E Dukes wrote:
Hello,
I am getting a new computer and am going to need to move the files from the old to the new. What is the best way to do this?
Should I install CentOS from scratch on the new computer
then move the
directories I need? How do I maintain permissions if this
is the best way?
If you have the luxury of having both machines online at the same time, why not just use the easy way out and use rsync? Or as someone else suggested, you could physically attach the new drive to the old computer and copy the data to to it with any number of tools (tar/dump/cp/etc....).
Cheers,
I can put both online but have never used rsync nor dump. The old pc is old! A P3-450, 18GB HD. The new one is a P4-3.0Ghz with 1GB ram. The way CentOS will do the partitions will probably be different than from the old, especially the SWAP.
You don't need to copy swap.
The old system has been upgraded numerous times since RedHat 8.0. I like the idea of a fresh install but want to make sure I have everything working on the new without missing something I installed on the old one.
You can just use disk druid and create your partitions any way you want ...
I personally grab the old hard drive, stick it in the new PC and use rsync (or cp -a ) to copy each partition into the new one.
Decisions, decisions.............
-----Original Message----- From: centos-bounces@centos.org [mailto:centos-bounces@centos.org] On Behalf Of Johnny Hughes Sent: Sunday, March 05, 2006 10:51 AM To: CentOS ML Subject: RE: [CentOS] Moving files to new server
On Sun, 2006-03-05 at 10:20 -0500, Thomas E Dukes wrote:
-----Original Message----- From: centos-bounces@centos.org [mailto:centos-bounces@centos.org] On Behalf Of Chris Mauritz Sent: Sunday, March 05, 2006 10:08 AM To: CentOS mailing list Subject: Re: [CentOS] Moving files to new server
Thomas E Dukes wrote:
Hello,
I am getting a new computer and am going to need to
move the files
from the old to the new. What is the best way to do this?
Should I install CentOS from scratch on the new computer
then move the
directories I need? How do I maintain permissions if this
is the best way?
If you have the luxury of having both machines online at the same time, why not just use the easy way out and use rsync? Or as someone else suggested, you could physically attach the new drive to the old computer and copy the data to to it with
any number
of tools (tar/dump/cp/etc....).
Cheers,
I can put both online but have never used rsync nor dump.
The old pc
is old! A P3-450, 18GB HD. The new one is a P4-3.0Ghz with
1GB ram.
The way CentOS will do the partitions will probably be
different than
from the old, especially the SWAP.
You don't need to copy swap.
The old system has been upgraded numerous times since
RedHat 8.0. I
like the idea of a fresh install but want to make sure I have everything working on the new without missing something I
installed on
the old one.
You can just use disk druid and create your partitions any way you want ...
I personally grab the old hard drive, stick it in the new PC and use rsync (or cp -a ) to copy each partition into the new one.
Hello Johnny,
I believe by default, CentOS will setup a /boot, / and SWAP partitions. Is it still a good idea these days to create one for /home and /var?
Thanks!!
On Sun, 2006-03-05 at 11:01 -0500, Thomas E Dukes wrote:
-----Original Message----- From: centos-bounces@centos.org [mailto:centos-bounces@centos.org] On Behalf Of Johnny Hughes Sent: Sunday, March 05, 2006 10:51 AM To: CentOS ML Subject: RE: [CentOS] Moving files to new server
On Sun, 2006-03-05 at 10:20 -0500, Thomas E Dukes wrote:
-----Original Message----- From: centos-bounces@centos.org [mailto:centos-bounces@centos.org] On Behalf Of Chris Mauritz Sent: Sunday, March 05, 2006 10:08 AM To: CentOS mailing list Subject: Re: [CentOS] Moving files to new server
Thomas E Dukes wrote:
Hello,
I am getting a new computer and am going to need to
move the files
from the old to the new. What is the best way to do this?
Should I install CentOS from scratch on the new computer
then move the
directories I need? How do I maintain permissions if this
is the best way?
If you have the luxury of having both machines online at the same time, why not just use the easy way out and use rsync? Or as someone else suggested, you could physically attach the new drive to the old computer and copy the data to to it with
any number
of tools (tar/dump/cp/etc....).
Cheers,
I can put both online but have never used rsync nor dump.
The old pc
is old! A P3-450, 18GB HD. The new one is a P4-3.0Ghz with
1GB ram.
The way CentOS will do the partitions will probably be
different than
from the old, especially the SWAP.
You don't need to copy swap.
The old system has been upgraded numerous times since
RedHat 8.0. I
like the idea of a fresh install but want to make sure I have everything working on the new without missing something I
installed on
the old one.
You can just use disk druid and create your partitions any way you want ...
I personally grab the old hard drive, stick it in the new PC and use rsync (or cp -a ) to copy each partition into the new one.
Hello Johnny,
I believe by default, CentOS will setup a /boot, / and SWAP partitions. Is it still a good idea these days to create one for /home and /var?
That depends on if you will need to add additional space later specifically to those places.
We put lots of stuff in home in our server set ups ... and var has lots things (like logs) that grow. If you use LVM on your machine, you can add new drives (Physical Volumes / PVs) and add space to other partitions. In this senerio, having things like /tmp and /var and /home on separate partitions helps to more easily add things.
But if the hard drive you have is not going to need to be added to for the lifetime of your install ... then having more than the 3 basic partitions is adding complexity that is probably not required.
(With the exception of maybe home on a separate drive and partition ... I do this with my main workstation. So that I can do a new install on another machine ... then move my home drive over. This is helpful when do upgrades to new OSes, etc.)
For a normal setup though, where the machine is not probably going to switch to a new OS, I normally just do a swap and /boot and root partition.
-----Original Message----- From: centos-bounces@centos.org [mailto:centos-bounces@centos.org] On Behalf Of Johnny Hughes Sent: Sunday, March 05, 2006 11:15 AM To: CentOS ML Subject: RE: [CentOS] Moving files to new server
On Sun, 2006-03-05 at 11:01 -0500, Thomas E Dukes wrote:
-----Original Message----- From: centos-bounces@centos.org [mailto:centos-bounces@centos.org] On Behalf Of Johnny Hughes Sent: Sunday, March 05, 2006 10:51 AM To: CentOS ML Subject: RE: [CentOS] Moving files to new server
On Sun, 2006-03-05 at 10:20 -0500, Thomas E Dukes wrote:
-----Original Message----- From: centos-bounces@centos.org [mailto:centos-bounces@centos.org] On Behalf Of Chris Mauritz Sent: Sunday, March 05, 2006 10:08 AM To: CentOS mailing list Subject: Re: [CentOS] Moving files to new server
Thomas E Dukes wrote:
Hello,
I am getting a new computer and am going to need to
move the files
from the old to the new. What is the best way to do this?
Should I install CentOS from scratch on the new computer
then move the
directories I need? How do I maintain permissions if this
is the best way?
If you have the luxury of having both machines online at the same time, why not just use the easy way out and use rsync? Or as someone else suggested, you could physically attach the new drive to the old computer and copy the data to to it with
any number
of tools (tar/dump/cp/etc....).
Cheers,
I can put both online but have never used rsync nor dump.
The old pc
is old! A P3-450, 18GB HD. The new one is a P4-3.0Ghz with
1GB ram.
The way CentOS will do the partitions will probably be
different than
from the old, especially the SWAP.
You don't need to copy swap.
The old system has been upgraded numerous times since
RedHat 8.0. I
like the idea of a fresh install but want to make sure I have everything working on the new without missing something I
installed on
the old one.
You can just use disk druid and create your partitions
any way you
want ...
I personally grab the old hard drive, stick it in the new
PC and use
rsync (or cp -a ) to copy each partition into the new one.
Hello Johnny,
I believe by default, CentOS will setup a /boot, / and SWAP partitions. Is it still a good idea these days to create
one for /home and /var?
That depends on if you will need to add additional space later specifically to those places.
We put lots of stuff in home in our server set ups ... and var has lots things (like logs) that grow. If you use LVM on your machine, you can add new drives (Physical Volumes / PVs) and add space to other partitions. In this senerio, having things like /tmp and /var and /home on separate partitions helps to more easily add things.
But if the hard drive you have is not going to need to be added to for the lifetime of your install ... then having more than the 3 basic partitions is adding complexity that is probably not required.
(With the exception of maybe home on a separate drive and partition ... I do this with my main workstation. So that I can do a new install on another machine ... then move my home drive over. This is helpful when do upgrades to new OSes, etc.)
For a normal setup though, where the machine is not probably going to switch to a new OS, I normally just do a swap and /boot and root partition.
Thanks for the info. My current setup is with just the three partitions. I have never had any problems doing it that way and I'm very pleased with CentOS which has been upgraded several times since Redhat 8.0. I had a few bumps in the road with the Fedora releases but nothing major. Just thought I'd ask these question while I have an opportunity to change things a little. I have thought about adding a second HD for /home and /var and still might do so while I have the chance.
Again, thanks!!
On Sun, 2006-03-05 at 09:20, Thomas E Dukes wrote:
I can put both online but have never used rsync nor dump. The old pc is old! A P3-450, 18GB HD. The new one is a P4-3.0Ghz with 1GB ram. The way CentOS will do the partitions will probably be different than from the old, especially the SWAP. The old system has been upgraded numerous times since RedHat 8.0. I like the idea of a fresh install but want to make sure I have everything working on the new without missing something I installed on the old one.
Decisions, decisions.............
Version-level upgrades are always a bad idea because they can leave old stuff around. I'd recommend taking this opportunity to clean things up with a fresh install and only copy over the contents of the home directories and any ftp or web sites that might be set up. Bring the new machine up with a different IP and name at first, then copy over things and configure it to match the old one, keeping a log of anything you have to do that isn't completely obvious. You can copy files with 'scp file newmachine:/path' or directories or files with: rsync -av -essh source newmachine:/path/to/target. Copy over /etc/passwd, /etc/shadow, /etc/group, /etc/gshadow and rsync the /home directory and any directories containing web or ftp sites. If you have trouble configuring any services, copy the old config file over to a new name on the new machine and diff them to see what you might have missed. When everything appears to be working, shut down services on the old one, rsync /var/spool/mail and repeat the rsync of /home and anything else that might have changed (these will go fast because rsync only copies changes). Change the name and IP on both the old and new machine and reboot. Note that routers may cache the ARP for the old mac address and have trouble reaching the changed IP for as long as 20 minutes, but machines on the same net should switch immediately (just in case you are working remotely...).
If you find you missed anything later, you still have it on the old machine.
-----Original Message----- From: centos-bounces@centos.org [mailto:centos-bounces@centos.org] On Behalf Of Les Mikesell Sent: Sunday, March 05, 2006 1:01 PM To: CentOS mailing list Subject: RE: [CentOS] Moving files to new server
On Sun, 2006-03-05 at 09:20, Thomas E Dukes wrote:
I can put both online but have never used rsync nor dump.
The old pc
is old! A P3-450, 18GB HD. The new one is a P4-3.0Ghz with
1GB ram.
The way CentOS will do the partitions will probably be
different than
from the old, especially the SWAP. The old system has been
upgraded
numerous times since RedHat 8.0. I like the idea of a
fresh install
but want to make sure I have everything working on the new without missing something I installed on the old one.
Decisions, decisions.............
Version-level upgrades are always a bad idea because they can leave old stuff around. I'd recommend taking this opportunity to clean things up with a fresh install and only copy over the contents of the home directories and any ftp or web sites that might be set up. Bring the new machine up with a different IP and name at first, then copy over things and configure it to match the old one, keeping a log of anything you have to do that isn't completely obvious. You can copy files with 'scp file newmachine:/path' or directories or files with: rsync -av -essh source newmachine:/path/to/target. Copy over /etc/passwd, /etc/shadow, /etc/group, /etc/gshadow and rsync the /home directory and any directories containing web or ftp sites. If you have trouble configuring any services, copy the old config file over to a new name on the new machine and diff them to see what you might have missed. When everything appears to be working, shut down services on the old one, rsync /var/spool/mail and repeat the rsync of /home and anything else that might have changed (these will go fast because rsync only copies changes). Change the name and IP on both the old and new machine and reboot. Note that routers may cache the ARP for the old mac address and have trouble reaching the changed IP for as long as 20 minutes, but machines on the same net should switch immediately (just in case you are working remotely...).
If you find you missed anything later, you still have it on the old machine.
-- Les Mikesell lesmikesell@gmail.com
Hello Les,
I think you are right about the fresh install. This machine has been upgraded numerous times and I have the opportunity to clean things up. My biggest concerns are the users, home directories and mysql dbs.
Thanks for the step by step!!!!
Eddie
--- Thomas E Dukes edukes@alltel.net wrote:
Hello Les,
I think you are right about the fresh install. This machine has been upgraded numerous times and I have the opportunity to clean things up. My biggest concerns are the users, home directories and mysql dbs.
Thanks for the step by step!!!!
Eddie
With Update 3 knocking on the door If I was you I'd :-
- burn fresh iso's of U3 (when they arrive) and partition the new server afresh. - Configure everything afresh bearing in mind that the old configurations. - Use the old as a backup while the new one gets on its feet.
Your present setup given the numerous upgrades and so on is not recommended for a production machine.
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-----Original Message----- From: centos-bounces@centos.org [mailto:centos-bounces@centos.org] On Behalf Of Jim Smith Sent: Sunday, March 05, 2006 1:44 PM To: CentOS mailing list Subject: RE: [CentOS] Moving files to new server
--- Thomas E Dukes edukes@alltel.net wrote:
Hello Les,
I think you are right about the fresh install. This
machine has been
upgraded numerous times and I have the opportunity to clean
things up.
My biggest concerns are the users, home directories and mysql dbs.
Thanks for the step by step!!!!
Eddie
With Update 3 knocking on the door If I was you I'd :-
- burn fresh iso's of U3 (when they arrive) and partition the
new server afresh.
- Configure everything afresh bearing in mind that the old
configurations.
- Use the old as a backup while the new one gets on its feet.
Your present setup given the numerous upgrades and so on is not recommended for a production machine.
Didn't realize a new update was coming. It may be the end of next week before I get the new PC and probably the weekend before I have a chance to even set it up. Do you know how long before the update?
Thanks for letting me know this!!
On 3/5/06, Thomas E Dukes edukes@alltel.net wrote:
Do you know how long before the update?
Already answered. A week or so after the upstream vendor gets a round tuit.
-- Collins Richey The agnostic dyslexic insomniac lies awake wondering if there is a dog.
On Sun, 2006-03-05 at 13:24 -0500, Thomas E Dukes wrote:
On Sun, 2006-03-05 at 09:20, Thomas E Dukes wrote:
The old system has been upgraded numerous times since RedHat 8.0.
Version-level upgrades are always a bad idea because they can leave old stuff around. I'd recommend taking this opportunity to clean things up with a fresh install and only copy over the contents of the home directories and any ftp or web sites that might be set up.
I think you are right about the fresh install. This machine has been upgraded numerous times and I have the opportunity to clean things up. My biggest concerns are the users, home directories and mysql dbs.
When you copy your home directory to the new machine, copy it to /home/thomas/old instead of /home/thomas. This way, you will keep copies of everything, but it won't be in the way of newer programs. Some programs don't behave well when old configuration files are left lying around in /home/thomas. Poor behavior can range from minor (you never see the new abilities of the program) to really bad (trashes files).
-David
On Tuesday 07 March 2006 09:47, David Johnston wrote:
Poor behavior can range from minor (you never see the new abilities of the program) to really bad (trashes files).
Perhaps I've been bitten by "poor behavior" but I've been nursing along the same home directory since about 1999 without any particular issues. Guess it depends on your goal: mine has always been to get back to productivity as quickly as possible after an O/S upgrade.
-Ben
-----Original Message----- From: centos-bounces@centos.org [mailto:centos-bounces@centos.org] On Behalf Of Les Mikesell Sent: Sunday, March 05, 2006 1:01 PM To: CentOS mailing list Subject: RE: [CentOS] Moving files to new server
Version-level upgrades are always a bad idea because they can leave old stuff around. I'd recommend taking this opportunity to clean things up with a fresh install and only copy over the contents of the home directories and any ftp or web sites that might be set up. Bring the new machine up with a different IP and name at first, then copy over things and configure it to match the old one, keeping a log of anything you have to do that isn't completely obvious. You can copy files with 'scp file newmachine:/path' or directories or files with: rsync -av -essh source newmachine:/path/to/target. Copy over /etc/passwd, /etc/shadow, /etc/group, /etc/gshadow and rsync the /home directory and any directories containing web or ftp sites.
Hello,
The new server is in and I am about to attempt the file transfers. I have NEVER attempted this and want to do it right the first time.
Reading the man pages for cp and scp it looks as if the -a switches are different. Are they? I want/am going to transfer files/directories across the local network. Should I work from the new machine or the old? What files are machine dependent? In other words, what files, if any, should not be copied because of hardware differences?
Sorry for all the seemingly stupid questions but as I said, I have never undertaken this before.
TIA
-----Original Message----- From: Chris Mauritz chrism@imntv.com To: CentOS mailing list centos@centos.org Sent: Sun, 05 Mar 2006 10:07:35 -0500 Subject: Re: [CentOS] Moving files to new server
Thomas E Dukes wrote:
Hello,
I am getting a new computer and am going to need to move the files
from the
old to the new. What is the best way to do this?
Should I install CentOS from scratch on the new computer then move
the
directories I need? How do I maintain permissions if this is the
best way?
If you have the luxury of having both machines online at the same time, why not just use the easy way out and use rsync? Or as someone else suggested, you could physically attach the new drive to the old computer and copy the data to to it with any number of tools (tar/dump/cp/etc....). ------------------------------------------------------------------------- ----------------- Wow, i never heard about rsync. What's that? Thai ________________________________________________________________________ Check Out the new free AIM(R) Mail -- 2 GB of storage and industry-leading spam and email virus protection.
lnthai2002@aim.com wrote:
Thomas E Dukes wrote:
Hello,
I am getting a new computer and am going to need to move the files
from the
old to the new. What is the best way to do this?
Should I install CentOS from scratch on the new computer then move the directories I need? How do I maintain permissions if this is the
best way?
If you have the luxury of having both machines online at the same time, why not just use the easy way out and use rsync? Or as someone else suggested, you could physically attach the new drive to the old computer and copy the data to to it with any number of tools (tar/dump/cp/etc....).
Wow, i never heard about rsync. What's that?
I keep a file called "Migration Script" for each server. It's a list of everything I had to install to operate everything on the server. Any time I have to install or change the config on the server, I update this file as well. Every 2 years or so, when I'm getting ready to set up a new server, I review this file as I build a new system.
After everything has been installed, I prepare a final "switchover plan" that contains detailed (line by line, file by file) instructions in review for switching over things like /etc/passwd & /etc/shadow, ntp.conf, sshd_conf, /etc/sysctl.conf, and so on.
This keeps downtime in switchover minimal, even when I'm doing a "worst case" emergency switchover. (EG: hosting provider goes belly-up without any warning at all, which happened once)
One of the steps in this whole process is that I carefully keep a list of all client data in var by directory (eg: /var/spool/mail, /var/spool/cron) and otherwise keep all other client data in /home, so that I know exactly what files to keep from OS to OS. (For example, copying over /var/lib/rpm could seriously bork things, while keeping /var/www can be crucial)
I use rsync to copy over this data, either from the server-to-be-replaced or from backups as appropriate to the new server.
-Ben
On Sunday 05 March 2006 06:34, Thomas E Dukes wrote:
I am getting a new computer and am going to need to move the files from the old to the new. What is the best way to do this?
Should I install CentOS from scratch on the new computer then move the directories I need? How do I maintain permissions if this is the best way?
Benjamin Smith wrote:
I keep a file called "Migration Script" for each server. It's a list of everything I had to install to operate everything on the server. Any time I have to install or change the config on the server, I update this file as well. Every 2 years or so, when I'm getting ready to set up a new server, I review this file as I build a new system.
I do this too. I keep a detailed log of anything "special" I had to do at install time. Then, as time goes by, anything that's done over and above a "yum update" gets an entry as well. These files are invaluable when (inevitably years later) you need to update/move/recover the machine in a "forced march" scenario. Fortunately, these days I've got some whippersnappers to do most of this for me, but when I occasionally get stuck fixing something due to someone being out on holiday or sick, these things are life savers. Highly recommended practice!!! 8-)
Cheers,
Chris Mauritz wrote:
I do this too. I keep a detailed log of anything "special" I had to do at install time. Then, as time goes by, anything that's done over and above a "yum update" gets an entry as well. These files are invaluable
In addition to a doc like y'all are talking about, I try and maintain the tarballs/custom RPMs in /opt/src/, and the compiles of said tarballs in /opt/build/. That gives you and instant clue (after years of not looking at that server) what had to be done; an innd upgrade, custom PHP compile, your own courier-imap RPMs, etc. Just an idea...
-te