Creating a CentOS\Red Hat VMware template - Revision history

Ppapa: /* Make sure the template is correct */

2012-02-08T06:47:59Z

‎Make sure the template is correct

Ppapa at 06:47, 8 February 2012

2012-02-08T06:47:21Z

Ppapa: /* Fixing a VM made with a bad template */

2012-02-08T06:47:05Z

‎Fixing a VM made with a bad template

Ppapa: /* Make sure the template is correct */

2012-02-08T06:46:55Z

‎Make sure the template is correct

Ppapa: Created page with "One of the good things about VMware is that you can create an OS template. That's a complete pre-configured VM that you can use to create other machines from. However, you can..."

2012-02-08T06:39:01Z

Created page with "One of the good things about VMware is that you can create an OS template. That's a complete pre-configured VM that you can use to create other machines from. However, you can..."

New page

One of the good things about VMware is that you can create an OS template. That's a complete pre-configured VM that you can use to create other machines from. However, you can get into a little bit of trouble with CentOS/Red Hat, in particular with networking. When creating a template, you first build a VM, install an OS, configure it the way you like it and then convert it into a template. When you convert a CentOS/Red Hat VM into a template it will keep the virtual NIC MAC address of the original VM you created it from. As such, when you build other VM's from this template, they will have incorrect MAC addresses for their virtual NIC's. Here's how to make sure this doesn't happen.

== Make sure the template is correct ==

The last steps before converting the VM into a template should be:

1. Edit any ifcfg-ethX files, in /etc/sysconfig/netwrok-scripts/, that you may have and delete the MAC address lines, i.e. HWADDR=XX:XX:XX:XX:XX:XX

2. Edit /etc/udev/rules.d/70-persistent-net.rules and delete any lines that have a MAC address in them.

Example:

# PCI device 0x8086:0x1076 (e1000)
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="00:0e:0c:07:75:dd", ATTR{type}=="1", NAME="eth0"

# PCI device 0x8086:0x103a (e100)
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="00:0e:a6:35:9c:be", ATTR{type}=="1", NAME="eth1"

NOTE: Don't worry, this will be automatically re-created when you start the new VM.

3. Shutdown the VM and convert into a template immediately.

NOTE: If you have to reboot for any reason before converting this VM into a template, you will have to repeat step 2.

← Older revision		Revision as of 06:47, 8 February 2012
Line 39:		Line 39:
	5. Re-start the VM.		5. Re-start the VM.

−	It should now have re-created the contents of etc/udev/rules.d/70-persistent-net.rules and should have the right MAC addresses for each NIC.	+	It should now have re-created the contents of etc/udev/rules.d/70-persistent-net.rules and should have the right MAC addresses for each virtual NIC.

← Older revision		Revision as of 06:46, 8 February 2012
Line 23:		Line 23:

	NOTE: If you have to reboot for any reason before converting this VM into a template, you will have to repeat step 2.		NOTE: If you have to reboot for any reason before converting this VM into a template, you will have to repeat step 2.
		+
		+
		+	== Fixing a VM made with a bad template ==
		+
		+	So you didn't follow the instructions above and now have a machine with incorrect MAC addresses and no network connectivity. You can recover it by:
		+
		+	1. Edit any ifcfg-ethX files, in /etc/sysconfig/netwrok-scripts/, that you may have and delete the MAC address lines, i.e. HWADDR=XX:XX:XX:XX:XX:XX
		+
		+	2. Edit /etc/udev/rules.d/70-persistent-net.rules and delete any lines that have a MAC address in them.
		+
		+	3. Shutdown the VM
		+
		+	4. Delete the Virtual interfaces from the machine via the vSphere Client and then add them again.
		+
		+	5. Re-start the VM.
		+
		+	It should now have re-created the contents of etc/udev/rules.d/70-persistent-net.rules and should have the right MAC addresses for each NIC.

@@ Line 17: / Line 17: @@
    SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="00:0e:a6:35:9c:be", ATTR{type}=="1", NAME="eth1"
-NOTE:  Don't worry, this will be automatically re-created when you start the new VM.
+NOTE:  Don't worry, this will be automatically re-populated when you start the new VM.
 . Shutdown the VM and convert into a template immediately.

@@ Line 1: / Line 1: @@
 One of the good things about VMware is that you can create an OS template.  That's a complete pre-configured VM that you can use to create other machines from.  However,  you can get into a little bit of trouble with CentOS/Red Hat, in particular with networking.  When creating a template, you first build a VM, install an OS, configure it the way you like it and then convert it into a template.  When you convert a CentOS/Red Hat VM into a template it will keep the virtual NIC MAC address of the original VM you created it from.  As such, when you build other VM's from this template, they will have incorrect MAC addresses for their virtual NIC's.  Here's how to make sure this doesn't happen.
 == Make sure the template is correct ==
@@ Line 23: / Line 22: @@
 NOTE: If you have to reboot for any reason before converting this VM into a template, you will have to repeat step 2.
 == Fixing a VM made with a bad template ==