Upgrading Drupal

Hi, I want to know is there is any way to syncronize two instances ,not only the data ,also the modules and other files that
could change. I need have two copys of the web (two different drupal instances ) in different servers/countryes. I need
that both will be syncronized and then, if I install a module in one of then the changes will be replicated to the other, and also with the contents.

This is in production. We need also a test instance were develop before apply changes to producction.

Hello,
I have read here some doucuments and forum topics about Drupal upgrade and migration but I didn't find anything that suits my problem. I have now Drupal running on site abc.xyz with PHP 5.1.2 and MySQL 4.1.18 and I want to migrate it to different server def.xyz with PHP 5.2.4/MySQL 5.0.51a. I made this:
- exported database by phpMyAdmin from the first server
- substituted all strings in exported sql file from abc.xyz to def.xyz
- imported changed sql file to the second server
- copied Drupal folder from first server to the second one and renamed sites/abc.xyz to sites/def.xyz
- modified settings.php with new database login and password

I expected to have migration complete but there were some problems...

First problem is login. There is probably some change in hash method of MySQL (I read somewhere something) so password is not working. I have to set new one by selecting "forgot password link", login to Drupal from received email and set new password.

Second problem is theme and some other settings lost. Site looks ok when till I login. Then it "lost" primary menu and temporary folder settings (and maybe some other). It happens after login probably because there are still cached data from previous site location in database. When I clear cache tables it happens immediately so login does not affect this. I also get this warning:

I'm just learning Drupal....installed 6.15 last month and am going through a tutorial book with it. Today I decided to download the 6.16 upgrade because I noticed the pink warning messages about security. But I was honestly taken aback by the long list of things required to update! Is this typical for every update, and how frequently do they occur? What do you experienced Drupal folks do if you maintain multiple sites?

I'm still assessing whether Drupal is the best solution for me, so this is a factor....

Hi all,

So I'm trying to upgrade a site I inheritted from version 5.6 to 6.16. I have done the substep upgrade to 5.22 and then tried to 6.16 by deleting all files in the current directory, replacing with the 6.16 dowloaded files and replacing the Files and Sites folders (tweaking the settings.php as necessary).

When I try to reach the "update.php", the page is completely blank. When i attempt to reach the site I get the following code error:
---------------------------------

Warning: Unknown column 'serialized' in 'field list' query: SELECT data, created, headers, expire, serialized FROM gd_cache WHERE cid = 'variables' in C:\wamp\www\gdtest\includes\database.mysql.inc on line 128

Somehow, I've managed to screw up what I thought was a simple upgrade of the View module from 6.x-2.8 to 6.x-2.10 on one of my Drupal installations. (It worked fine on two others I manage.)

Now, my content is invisible to users who are not admins, even though I have permissions set up to make it public. (I'm not sure this is related to/caused by my Views problem, but I suspect it is, since it occurred after my attempted upgrade.)

I have tried numerous installation attempts, unzipped all the files and uploaded them in separate directories under site/all/themes and then modules. Nothing is showing up in admin, I'm so confused with it. Any one else had this trouble??

THANKS