- 1 Overview
- 2 Building the new server
- 3 Migrating images & database
- 4 Fix IP Addresses, Passwords, and Interface on new server
- 5 If FOG isn't doing DHCP
This article explains how to move FOG Settings & images from an old box to a new box. This is more safe and sure than attempting an OS upgrade, which is risky and might leave you with a broken server. It's more safe and more sure because we know exactly what to move over and how to do it. An OS upgrade is risky because if you upgrade and it doesn't work or leaves fog in an unusable state, we have no idea what broke or how to fix it without exhaustive troubleshooting that may or may not lead to a solution. Migrating from an old box to a new box also leaves your old box intact, which is another safety net in this method.
We are going to address the key spots:
- Migrating the database from the old server to the new one.
- Migrating the images from the old server to the new one.
- Migrating SSL information from the old server to the new one.
- Adjusting a few places in the new web interface after migration to use the new IP.
- Adjusting your DHCP settings if you aren't running DHCP on the new server.
Building the new server
The first step in this process is building a new FOG server using the latest version of your chosen Linux distribution. I would recommend CentOS 7 or Debian 8. Go through the normal steps of setting up the OS. Do not create a user called fog - it will cause you nothing but pain later on. If you're installing Debian or Ubuntu, name the user "tech" or "Administrator" or whatever your first name is, like "Bob". If you're using CentOS or Fedora or RHEL, no extra user is necessary, just set a good root password. Name the server fog-server if possible, and set a static IP or create a DHCP reservation for the server. After an IP is set, use your DNS server and create an 'A' record for the server's name and IP, Google search DNS A record if you're unsure how to do that. To install FOG, follow an appropriate installation manual or the Upgrade to trunk article.
Migrating images & database
The entire point of migrating is usually saving your host registrations, group configurations, image assignments, and your images. There is a great number of ways to move these, but for inexperienced or beginner Linux users I would recommend leveraging NFS on the new FOG Server.
Because the new FOG Server provides an NFS share, this is the easiest approach. This method is also uniform across the different distributions. This approach also works whether the old FOG Server's web interface is functional or not.
Via Terminal or SSH on the old FOG server, mount the new fog server's /images/dev directory to a local directory on the old server called /new. Where x.x.x.x is the new fog server's IP address.
mkdir /new mount x.x.x.x:/images/dev /new
We will export the database and move the export to the new server. This is performed on the old FOG Server. There are a few different examples of how to do this below, depending on if you're using a password or not, and how MySQL is configured. One of them will work for you.
#No password. mysqldump -B fog > /new/fogdb.sql #Password with root user. mysqldump -B fog -u root -p > /new/fogdb.sql #No password, localhost. mysqldump -B fog -h localhost > /new/fogdb.sql #No password, local loopback. mysqldump -B fog -h 127.0.0.1 > /new/fogdb.sql #Password with localhost. mysqldump -B fog -h localhost -u root -p > /new/fogdb.sql #Password with local loopback. mysqldump -B fog -h 127.0.0.1 -u root -p > /new/fogdb.sql
Now to move over the images. Again, this is performed on the old FOG server. The more images you have, the longer the below command will take to execute.
cp -r /images/* /new
Via Terminal or SSH on the new FOG server, we now need to import the database. Assuming you followed the above steps for exporting exactly, one of the below methods will work for you.
#No password. mysql -D fog < /images/dev/fogdb.sql #Password with root user. mysql -D fog -u root -p < /images/dev/fogdb.sql #No password, localhost. mysql -D fog -h localhost < /images/dev/fogdb.sql #No password, local loopback. mysql -D fog -h 127.0.0.1 < /images/dev/fogdb.sql #Password with localhost. mysql -D fog -h localhost -u root -p < /images/dev/fogdb.sql #Password with local loopback. mysql -D fog -h 127.0.0.1 -u root -p < /images/dev/fogdb.sql
After the database is successfully imported, you should delete the old file or move it. This is done on the new server. Here's the command to delete it:
rm -f /images/dev/fogdb.sql
It's important to note that this step will make the new server's web interface credentials the same as whatever the old server's was. If you don't know what the password is, you can follow steps here to reset the default web interface password: Password_Central#Web_Interface
This step is performed on the new FOG server. In this step we're simply moving the images to where they are supposed to be and setting the correct permissions. This step assumes that your new server's images directory is in the default location and you followed the above steps for moving them over exactly.
rm -f /images/dev/.mntcheck mv /images/dev/* /images touch /images/dev/.mntcheck chown -R fog:root /images chmod -R 777 /images
If old server was FOG 1.3.0+
Related article: FOG_Client#Maintain_Control_Of_Hosts_When_Building_New_Server
Because of the security model of FOG 1.3.0+ and the new FOG Client, without the proper CA and ssl certificates present on the new fog server, any currently deployed hosts with the new FOG Client installed will ignore the new server and not accept commands from it. This is by design.
In order to maintain control of existing hosts that have existing new FOG Clients installed or existing images that have the new FOG Client built into them, you must copy this directory from the old server to the new server: /opt/fog/snapins/ssl
If you followed the NFS instructions for mounting the new server to the old one in the earlier steps and have not shutdown or rebooted your old fog server since then, you can use the mount that should still be there. The below steps are performed on the old FOG server.
cp -R /opt/fog/snapins/ssl /new
On the new FOG Server, delete the existing ssl directory and then move the old ssl directory to the proper location, and then set permissions.
rm -rf /opt/fog/snapins/ssl mv /images/dev/ssl /opt/fog/snapins #Fedora, CentOS, and RHEL users should use this command to set permissions: chown -R fog:apache /opt/fog/snapins/ssl #Debian, Ubuntu, and Ubuntu variant users should use this command to set permissions: chown -R fog:www-data /opt/fog/snapins/ssl
To complete the ssl migration, on the new FOG Server, re-run the fog installer that you used for installing fog.
Fix IP Addresses, Passwords, and Interface on new server
Because we have imported the old database into the new server in order to preserve all of the host data, image definitions, group definitions, image assignments, and so on, we also imported all of the old server's IP Addresses and passwords along with it. This can't be helped using the approach we took - which is the approach to take if your web interface on the old server was just completely not working. Because of this, we need to change just a few places in the FOG Web GUI, and change the old FOG Server's IP address to the new FOG Server's IP Address, and update a few passwords.
First, we must find out what the new FOG Password and new interface is. On the new FOG Server, run this command and note the outputted lines that begin with password= and interface=
You'll want to copy/paste the password because of it's length.
Paste the password into the below fields in the new FOG Server's web interface:
- Web Interface -> Storage Management -> [click node name] -> Password and update the Interface field with the new interface name also.
- Web Interface -> FOG Configuration -> FOG Settings -> TFTP Server -> FOG_TFTP_FTP_PASSWORD
Update the IP Address in the below fields in the new FOG Server's web interface:
- Web Interface -> Storage Management -> [click node name] -> IP Address
- Web Interface -> FOG Configuration -> FOG Settings -> Web Server -> FOG_WEB_HOST
- Web Interface -> FOG Configuration -> FOG Settings -> TFTP Server -> FOG_TFTP_HOST
If FOG isn't doing DHCP
If you have an existing dedicated DHCP server, you'll need to update it. Completing this step will make the new FOG Server "live". You can make the old FOG Server "live" again by rolling back this step.
Windows Server DHCP
Use Remote Desktop to connect to the DHCP Server. Open the Run Dialog with the hotkeys Windows+R and type dhcpmgmt.msc and press enter or click run. The DHCP Management GUI should open.
Navigate through the left-most menus to IPv4 -> subnet -> Scope Options. Look for options 066 and 067, they should be plainly visible.
Change option 066 from the old FOG Server's IP address to the new FOG Server's IP Address.
Check option 067, if it's set to anything besides undionly.kpxe or undionly.kkpxe then you should change it to one of the previously mentioned values in red.
Linux / ISC-DHCP
Open Terminal on your DHCP Server, or SSH to the server.
If you're not already root, become root with sudo -i
Use your favorite editor to edit this file: /etc/dhcp/dhcpd.conf
I like to use Vi. Using Vi as your editor:
Look for these two lines throughout the document:
Change the value of next-server to the new FOG Server's IP Address. If you have just a simple DHCP configuration and filename only appears one time in the configuration, you will likely want this to be set to undionly.kpxe or undionly.kkpxe
After making changes and saving them, restart the DHCP service. On new Linux distributions this can typically be accomplished with:
systemctl restart dhcpd
If you have issues with restarting DHCP, get the full status of it with:
systemctl status dhcpd -l