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Diff for /wikisrc/ports/xen/howto.mdwn between versions 1.45 and 1.46

version 1.45, 2014/12/26 16:17:25 version 1.46, 2014/12/26 16:43:51
Line 465  similarly to vnds. Line 465  similarly to vnds.
 Virtual Networking  Virtual Networking
 ------------------  ------------------
   
 TODO: explain xvif concept, and that it's general.  Xen provides virtual ethernets, each of which connects the dom0 and a
   domU.  For each virtual network, there is an interface "xvifN.M" in
 There are two normal styles: bridging and NAT.  the dom0, and in domU index N, a matching interface xennetM (NetBSD
   name).  The interfaces behave as if there is an Ethernet with two
   adaptors connected.  From this primitive, one can construct various
   configurations.  We focus on two common and useful cases for which
   there are existing scripts: bridging and NAT.
   
 With bridging, the domU perceives itself to be on the same network as  With bridging, the domU perceives itself to be on the same network as
 the dom0.  For server virtualization, this is usually best.  the dom0.  For server virtualization, this is usually best.  Bridging
   is accomplished by creating a bridge(4) device and adding the dom0's
   physical interface and the various xvifN.0 interfaces to the bridge.
   One specifies "bridge=bridge0" in the domU config file.  The bridge
   must be set up already in the dom0; an example /etc/ifconfig.bridge0
   is:
   
           create
           up
           !brconfig bridge0 add wm0
   
 With NAT, the domU perceives itself to be behind a NAT running on the  With NAT, the domU perceives itself to be behind a NAT running on the
 dom0.  This is often appropriate when running Xen on a workstation.  dom0.  This is often appropriate when running Xen on a workstation.
   
 One can construct arbitrary other configurations, but there is no  
 script support.  
   
 Sizing domains  Sizing domains
 --------------  --------------
   
Line 509  obtain domU kernels. Line 519  obtain domU kernels.
 Config files  Config files
 ------------  ------------
   
 TODO: give example config files.   Use both lvm and vnd.  The following is an example domain configuration file, lightly
   sanitized from a known working on Xen 4.1 (NetBSD 5 amd64 dom0 and
   NetBSD 6 i386 domU):
   
           # -*- mode: python; -*-
   
           kernel = "/netbsd-XEN3PAE_DOMU-i386-foo.gz"
   
           memory = 1024
   
           name = "foo"
   
           #cpu = -1
   
           vif = [ 'mac=aa:00:00:d1:00:09,bridge=bridge0' ]
   
           disk = [ 'file:/n0/xen/foo-wd0,0x1,w',
                    'file:/n0/xen/foo-wd1,0x2,w' ]
   
           root = "xbd0"
   
           autorestart = True
   
   The kernel has the host/domU name in it, so that on the dom0 one can
   update the various domUs independently.  The vif line causes an
   interface to be provided, with a specific mac address (do not reuse
   MAC addresses!), in bridge mode.  Two disks are provided, and they are
   writable.
   
   TODO: explain if the root line is really necessary.
   TODO: explain or remove autorestart.
   
   TODO: Add an example with lvm
   
 TODO: explain the mess with 3 arguments for disks and how to cope (0x1).  TODO: explain, someplace the mess with 3 arguments for disks and how to cope (0x1).
   
 Starting domains  Starting domains
 ----------------  ----------------
Line 655  working vif-bridge is also provided with Line 697  working vif-bridge is also provided with
   
     #!/bin/sh      #!/bin/sh
     #============================================================================      #============================================================================
     # $NetBSD: howto.mdwn,v 1.44 2014/12/26 14:20:27 gdt Exp $      # $NetBSD: howto.mdwn,v 1.45 2014/12/26 16:17:25 gdt Exp $
     #      #
     # /usr/pkg/etc/xen/vif-bridge      # /usr/pkg/etc/xen/vif-bridge
     #      #
Removed from v.1.45  
changed lines
  Added in v.1.46

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