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cl349@arcadians.cl.cam.ac.uk
c4fea86999
Add an optional parameter (vcpus) to the xc_linux_build function replacing the getenv() previously used and removing the requirement of using maxcpus kernel parameter to limit the number of virtual cpus a guest uses. The value can now be controlled in the domain configuration files. The default value of 1 is set in XenDomainInfo.py but is overridden by parsing the config value. Signed-off-by: Ryan Harper <ryanh@us.ibm.com>
124 lines
4.1 KiB
Python
124 lines
4.1 KiB
Python
# -*- mode: python; -*-
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#============================================================================
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# Example Python setup script for 'xm create'.
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# This script sets the parameters used when a domain is created using 'xm create'.
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#
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# This is a relatively advanced script that uses a parameter, vmid, to control
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# the settings. So this script can be used to start a set of domains by
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# setting the vmid parameter on the 'xm create' command line. For example:
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#
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# xm create vmid=1
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# xm create vmid=2
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# xm create vmid=3
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#
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# The vmid is purely a script variable, and has no effect on the the domain
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# id assigned to the new domain.
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#============================================================================
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# Define script variables here.
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# xm_vars is defined automatically, use xm_vars.var() to define a variable.
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# This function checks that 'vmid' has been given a valid value.
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# It is called automatically by 'xm create'.
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def vmid_check(var, val):
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val = int(val)
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if val <= 0:
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raise ValueError
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return val
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# Define the 'vmid' variable so that 'xm create' knows about it.
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xm_vars.var('vmid',
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use="Virtual machine id. Integer greater than 0.",
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check=vmid_check)
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# Check the defined variables have valid values..
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xm_vars.check()
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#----------------------------------------------------------------------------
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# Kernel image file.
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kernel = "/boot/vmlinuz-2.6.9-xenU"
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# Optional ramdisk.
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#ramdisk = "/boot/initrd.gz"
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# The domain build function. Default is 'linux'.
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#builder='linux'
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# Initial memory allocation (in megabytes) for the new domain.
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memory = 64
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# A name for the new domain. All domains have to have different names,
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# so we use the vmid to create a name.
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name = "VM%d" % vmid
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# Which CPU to start domain on?
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#cpu = -1 # leave to Xen to pick
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cpu = vmid # set based on vmid (mod number of CPUs)
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# Number of Virtual CPUS to use, default is 1
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#vcpus = 1
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vcpus = 4 # make your domain a 4-way
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#----------------------------------------------------------------------------
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# Define network interfaces.
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# Number of network interfaces. Default is 1.
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#nics=1
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# Optionally define mac and/or bridge for the network interfaces.
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# Random MACs are assigned if not given.
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#vif = [ 'mac=aa:00:00:00:00:11, bridge=xen-br0' ]
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#----------------------------------------------------------------------------
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# Define the disk devices you want the domain to have access to, and
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# what you want them accessible as.
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# Each disk entry is of the form phy:UNAME,DEV,MODE
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# where UNAME is the device, DEV is the device name the domain will see,
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# and MODE is r for read-only, w for read-write.
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# This makes the disk device depend on the vmid - assuming
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# that devices sda7, sda8 etc. exist. The device is exported
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# to all domains as sda1.
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# All domains get sda6 read-only (to use for /usr, see below).
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disk = [ 'phy:sda%d,sda1,w' % (7+vmid),
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'phy:sda6,sda6,r' ]
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#----------------------------------------------------------------------------
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# Set the kernel command line for the new domain.
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# You only need to define the IP parameters and hostname if the domain's
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# IP config doesn't, e.g. in ifcfg-eth0 or via DHCP.
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# You can use 'extra' to set the runlevel and custom environment
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# variables used by custom rc scripts (e.g. VMID=, usr= ).
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# Set if you want dhcp to allocate the IP address.
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#dhcp="dhcp"
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# Set netmask.
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#netmask=
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# Set default gateway.
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#gateway=
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# Set the hostname.
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#hostname= "vm%d" % vmid
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# Set root device.
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root = "/dev/sda1 ro"
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# Root device for nfs.
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#root = "/dev/nfs"
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# The nfs server.
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#nfs_server = '169.254.1.0'
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# Root directory on the nfs server.
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#nfs_root = '/full/path/to/root/directory'
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# Sets runlevel 4 and the device for /usr.
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extra = "4 VMID=%d usr=/dev/sda6" % vmid
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#----------------------------------------------------------------------------
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# Set according to whether you want the domain restarted when it exits.
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# The default is 'onreboot', which restarts the domain when it shuts down
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# with exit code reboot.
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# Other values are 'always', and 'never'.
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#restart = 'onreboot'
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#============================================================================
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