Moving ZCS to Another Server

Introduction

 

Either you, or someone you know has been there. Almost out of Disk space, RAM is topped out, and the CPU is constantly running above 80%. It’s time to upgrade the hardware. But how easy and safe is it to move the Zimbra server instance? Well, it’s easier than you might think.

 

In this Zimbra Administrator’s PowerTip, we’ll discuss how to migrate your Zimbra server to another Machine or OS. The one big caveat is that both instances of Zimbra MUST be running the same version. So if your old server is running 4.5.5, then you’ll need to install 4.5.5 on your new server. This wouldn’t be the time to upgrade your ZCS version.

 

Part 1 : Backing Up

Step by Step:

1. As zimbra: zmcontrol stop
2. As root: ps aux | grep zimbra (make sure everything’s stopped)
3. Mount external disc to location of your choice. ex: /mnt/migration
4. As root: rsync -avH /opt/zimbra /mnt/migration (this may take a while)

Zimbra Network Edition contains a backup feature, and although it’s useful, we won’t be using it in this tip.

We have an external Hard Disc mounted to /mnt/migration. When rsync’ed, this is now your live copy (although it’s not live), and you should always have a backup of your live data. So, you might want to rsync again to another location to be safe.

Once you’ve rsync’ed all your data, umount the external drive, and put it somewhere safe.

 

 

Part 2 : Meet Your New Server

Step by Step:

1. Install Newer (supported) Operating System
2. Turn off older ZCS Server
3. Set up newer ZCS Server’s Network/Hostname is it was on the older server

The only thing that really matters on your new server, is whether or not meets Zimbra’s server Hardware and the Operating System requirements.

It’s also very important that you have resolved any dependency issues. The ZCS installer for your newer OS should check for these.

Setup the newer server with the old server’s networking attributes. Make sure your older server is offline.

If changing the hostname, please see this wiki article: Set zmhostname

 

 

Part 3 : Create a "dummy" Install Then Remove It

 

Step by Step:

1. Download the version of ZCS (ie 4.5.5 or 4.0) for the new OS you have
2. As Root: Run the installer with the -s option: ./install.sh -s
3. As Root: Remove the dummy install: rm -rf /opt/zimbra

The goal of this step is to get the rpm/dpkg databases correct. When you download ZCS, make sure it’s for your newer OS, and the SAME version of ZCS that’s rsync’ed.

Run the installer with the -s option. This tells the installer to only install the software, and not to configure the installation.

Once the installer has completed, delete it by rm -rf /opt/zimbra. This wipes any dummy data you have in that location.

 

Part 4 : Mount Your Backup HD, rsync, and Install

 

Step by Step:

1. Mount external Hard drive
2. As Root: rsync your backup to the new location: rsync -avH /mnt/migration/zimbra /opt/
3. Unmount external Hard drive and keep it safe
4. As Root: run zmfixperms located in /opt/zimbra/libexec
5. As Root: rerun the installer without the -s option

Connect and mount your external hard drive. Then, rsync the backed up data to its new location (rsync -avH /mnt/migration/zimbra /opt).

Connect and mount your external hard drive. Then, rsync the backed up data to its new location (rsync -avH /mnt/migration/zimbra /opt).
Unmount your backed up copy, and keep it in a safe place.
Now that our data is all in place, we need to fix some permissions. Go into the /opt/zimbra/libexec directory and run zmfixperms. This helps insure that all the files are owned correctly.
If uid/gid’s aren’t the same on both systems (see /etc/passwd and /etc/group) than you may need to modify /opt/zimbra/conf/localconfig.xml
If changing arch (32 to 64) see also http://blog.zimbra.com/blog/archives/2007/05/exporting-and-importing-zimbra-ldap-data.html and/or http://wiki.zimbra.com/wiki/Moving_ZCS_to_New_Server
Once that has completed, re run the installer that you downloaded. It will detect ZCS already installed, and ask if you want to upgrade. Select Yes.
 

 

本贴转自：http://blog.zimbra.com/blog/archives/2007/10/moving-zcs-to-another-server.html