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Installing a NetBSD/XEN paravirtualized guest
 
Preparing the guest skeleton
Prepare the installation and system kernels e.g.,
mkdir -p /data/guests/bsd64/
cd /data/guests/bsd64/
wget ftp://ftp.fr.netbsd.org/pub/NetBSD/NetBSD-6.0.1/amd64/binary/kernel/netbsd-INSTALL_XEN3_DOMU.gz
wget ftp://ftp.fr.netbsd.org/pub/NetBSD/NetBSD-6.0.1/amd64/binary/kernel/netbsd-XEN3_DOMU.gz
 
Create NetBSD guest's harddrive (assuming a linux dom0, which is sparse file capable with ext2/3/4),
dd if=/dev/zero of=bsd64.disk bs=1024k count=1 seek=10000
 
Create guest's configuration,
vi bsd64
like,
name = "bsd64"
memory = "512"
kernel = "/data/guests/bsd64/netbsd-INSTALL_XEN3_DOMU.gz"
#kernel = "/data/guests/bsd64/netbsd-XEN3_DOMU.gz"
disk = [ 'file:/data/guests/bsd64/bsd64.disk,xvda,w' ]
vif = [ 'vifname=vbsd64.0' ]
vcpus = "2"
Note. for routing instead of bridging,
vif = [ 'vifname=vbsd64.0,ip=XX.XX.XX.XX' ]
Note. if you have to define the mac address for restricted bridging, for example,
vif = [ 'vifname=vbsd64.0,mac=00:16:3e:00:00:fd' ]
 
Note. tap:aio: doesn't always work and is not recommended anyways
 
Note. if you want ISO image as installation media,
#disk = ['file:/data/guests/bsd64/bsd64.disk,xvda,w',\
# 'file:/data/guests/bsd64/amd64cd.iso,ioemu:hdc:cdrom,r']
and use 'xbd1a' as cdrom device within the installer.
 
Ready to go
Start the guest for 'sysinst',
cd /data/guests/bsd64/
xm create bsd64 -c
 
I had some network issue with previous versions of NetBSD on a Linux dom0 (even with NetBSD 5) but now with NetBSD 6 it's ok. Network works great (no tcp offloading enabled on the dom0, should try with it).
 
Note. You can always configure network manually first and then start sysinst,
^C
ifconfig -a
ifconfig xennet0 inet XX.XX.XX.XX netmask 255.255.255.0 up
mount_nfs NFSSRV:/data/shared/netbsdx64/ /mnt2
sysinst
 
During installation,
check all sets but kernel, kernel modules (unless you want pygrub from pkgsrc) and X sets
 
Note. Eventually disable journaling (-o log) from the mount options if running a Linux dom0. Linux and NetBSD do not seem to share the same cash flush methods.
Note. harddrive will appear as 'xbd0'
Note. cdrom will eventually appear as 'xbd1' (use 'xbd1a')
Note. recent installer ramdisks are readonly, I can't mkdir anymore. vmstat is gone too.
 
When installation has finished,
exit install system
halt -p
 
Switch to the normal kernel (and eventually remove the ISO image),
cd /data/guests/bsd64/
vi bsd64
change to,
kernel = "/data/guests/bsd64/netbsd-XEN3_DOMU.gz"
 
You can now start the guest normally,
xm cr bsd64 -c
 
Disable offloading (optional)
On the dom0 (here Linux),
ethtool -K vbsd0 rx off
ethtool -K vbsd0 tx off
ethtool -K vbsd0 sg off
ethtool -K vbsd0 tso off
ethtool -K vbsd0 ufo off
ethtool -K vbsd0 gso off
ethtool -K vbsd0 gro off
ethtool -K vbsd0 lro off
 
Post-installation
Fixing minor errors
Beside your usual NetBSD post-installation procedure, the following prevents minors errors from showing up at startup. Disable wscons system drivers,
cd /etc/
vi rc.conf
change,
wscons=no
 
Disable virtual terminals,
vi ttys
change,
ttyE1 "/usr/libexec/getty Pc" vt220 off secure
ttyE2 "/usr/libexec/getty Pc" vt220 off secure
ttyE3 "/usr/libexec/getty Pc" vt220 off secure
 
 
PyGRUB (optional)
PyGRUB is also available from pkgsrc. To apply,
cd /data/guests/bsdc/
vi bsdc
change,
#kernel=...
bootloader = "/usr/pkg/bin/pygrub"
 
References
http://wiki.xensource.com/xenwiki/XenNetworking
http://wiki.xensource.com/xenwiki/XenNetRoutingWithPrivateNetwork
 

Last update: Jan 19, 2013