Installing Redhat Enterprise Server 5 under Sun xVM/Xen

Installing Redhat Enterprise Server 5 in a Sun xVM Xen environment is straightforward and easy.

We will create a 15G zfs block volume to hold the server data to boot:

# zfs create -b 4k -V 15G xvm/redhat.zvol
In my environment, I use a zpool named "xvm" to hold the virtual machine data. "xvm/redhat.zvol" has become a block device with a normal block device entry: /dev/zvol/dsk/xvm/redhat.zvol.

Then, I had to mount the ISO file on a mountpoint - I chose "/cdrom":

# mount -F hsfs /xvm/ISO/rhel-server-5.4-x86_64-dvd.iso /cdrom
That's nice from Solaris to let me mount an iso file so easily onto a directory.

After that, I shared this cdrom directory via NFS:

# share -o ro /cdrom
That's it! Now I was able to start the installation:


 # virt-install --name "Redhat" --disk path=/dev/zvol/dsk/xvm/redhat.zvol 
  --paravirt --ram 1024 --os-type linux --os-variant rhel5 
  --location nfs:pgt01:/cdrom --nographics

My machine had the DNS name "pgt01", so I had to type "nfs:pgt01:/cdrom" as location so that the "virt-install" was able to find the relevant components AND the installer was able to mount the installation media!

The result:


Starting install...
Retrieving file .treeinfo 100% |=========================|  442 B    00:00     
Retrieving file vmlinuz.. 100% |=========================| 1.9 MB    00:00     
Retrieving file initrd.im 100% |=========================| 7.1 MB    00:00     
Creating domain...                                                 0 B 00:01 
Connected to domain 67
Escape character is '^]'
Bootdata ok (command line is method=nfs:pgt01:/cdrom)
Linux version 2.6.18-164.el5xen (mockbuild@x86-003.build.bos.redhat.com) (gcc version 4.1.2 20080704 (Red Hat 4.1.2-46)) #1 SMP Tue Aug 18 15:59:52 EDT 2009
BIOS-provided physical RAM map:
 Xen: 0000000000000000 - 0000000040800000 (usable)
No mptable found.
Built 1 zonelists.  Total pages: 264192
Kernel command line: method=nfs:pgt01:/cdrom
Initializing CPU#0
... and many lines more..

After a short instant, the following screen should appear:

redhatxen0.png

Chose your appropriate language. To change between input fields use the TAB key - so press TAB to move the cursor to the OK field and press Return:

redhatxen1.png

As I had a DHCP server on my network segment it was simple - remember your virtual Redhat machine ahs to find your Dom0 machine in the network under the name given with the "virt-install" command (pgt01 in my case), otherwise the NFS mount of the installation media will fail!

After "OK" this will appear:

redhatxen2.png

We used "--nographics" in the "virt-install" command above. So you won't be able to use VNC. If you want to use a graphical console repeat the installation with "--vnc" instead of "--nographics."
I chose "Use text mode":

redhatxen3.png

The system "sees" our configured 15GB device (ZFS block volume created in the first step) and yes, it has no usable partition table. So "Yes", I wanted to initialize this:

redhatxen4.png

I just "clicked" (how would you say on a text console? "selected"?) on "OK" (pressing TAB until the cursor marked the OK "button"). The system just wants to make sure that I know that I the partition table will be created - as my zfs block volume really was empty I can sleep well with this.

redhatxen5.png

In this screen DO NOT DESELECT "virtualization". Yes, we won't use Redhat to virtualize but we need the paravirtualized Xen Kernel! And its included in the "virtualization" selection!

Choose the other two like your needs are.

Next step: The installation programs formats the "hard drive":

redhatxen6.png

After this selection, the program will begin to install:

redhatxen7.png


After some moments (it is really fast!), the following should appear:

redhatxen8.png


You're almost done! The "reboot" is very fast - your console session will continue like this:

rebooting system
Restarting system.
libvir: error : Unknown failure

Connection to domain 67 closed.

Guest installation complete... restarting guest.
Connected to domain 68
Escape character is '^]'
rtc: IRQ 8 is not free.
rtc: IRQ 8 is not free.
i8042.c: No controller found.
Red Hat nash version 5.1.19.6 starting
  Reading all physical volumes.  This may take a while...
  Found volume group "VolGroup00" using metadata type lvm2
  2 logical volume(s) in volume group "VolGroup00" now active
		Welcome to Red Hat Enterprise Linux Server
		Press 'I' to enter interactive startup.


... many lines omitted, it justs starts your virtual Redhat Enterprise machine ...

After booting your virtual machine, the following will appear:

redhatxen9.png

After this point, it is the same procedure as a normal Redhat ES install. Just make the settings you want and you're done! You may switch to the Redhat Server console using the "virsh console" command:

redhatxenA.png


Press Ctrl-Alt-6 to quit the Xen console.

With "rhn_register" you may register your machine with the Redhat Network and then you are able to install the updates.

Your machine will appear as para-virtualized in your Redhat server list on redhat.com.

Mission accomplished.


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1 Comments

Hi,
I have been trying to install RHEL 5.6 with PV mode under Solaris 11 Express (b151) xVM for one month. I read your blog. Installation was successful. But when I tried to boot the PV RHEL5.6. So if you are successful for installing RHEL5.6 on Solaris 11 Express(b151), could you tell me the hint?

Ryo

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