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Wen Congyang
355f7ba983
Add cmdline switches to 'xl migrate-receive' command to specify a domain-specific hotplug script to setup COLO proxy. Add a new config var 'colo.default.agentscript' to xl.conf, that allows the user to override the default global script used to setup COLO proxy. Signed-off-by: Yang Hongyang <hongyang.yang@easystack.cn> Signed-off-by: Wen Congyang <wency@cn.fujitsu.com> Signed-off-by: Changlong Xie <xiecl.fnst@cn.fujitsu.com> Acked-by: Ian Jackson <ian.jackson@eu.citrix.com>
192 lines
5.0 KiB
Plaintext
192 lines
5.0 KiB
Plaintext
=head1 NAME
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/etc/xen/xl.conf - XL Global/Host Configuration
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=head1 DESCRIPTION
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The F<xl.conf> file allows configuration of hostwide C<xl> toolstack
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options.
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For details of per-domain configuration options please see
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L<xl.cfg(5)>.
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=head1 SYNTAX
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The config file consists of a series of C<KEY=VALUE> pairs.
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A value C<VALUE> is one of:
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=over 4
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=item B<"STRING">
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A string, surrounded by either single or double quotes.
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=item B<NUMBER>
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A number, in either decimal, octal (using a C<0> prefix) or
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hexadecimal (using an C<0x> prefix).
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=item B<BOOLEAN>
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A C<NUMBER> interpreted as C<False> (C<0>) or C<True> (any other
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value).
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=item B<[ VALUE, VALUE, ... ]>
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A list of C<VALUES> of the above types. Lists are homogeneous and are
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not nested.
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=back
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The semantics of each C<KEY> defines which form of C<VALUE> is required.
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=head1 OPTIONS
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=over 4
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=item B<autoballoon="off"|"on"|"auto">
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If set to "on" then C<xl> will automatically reduce the amount of
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memory assigned to domain 0 in order to free memory for new domains.
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If set to "off" then C<xl> will not automatically reduce the amount of
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domain 0 memory.
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If set to "auto" then auto-ballooning will be disabled if the
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C<dom0_mem> option was provided on the Xen command line.
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You are strongly recommended to set this to C<"off"> (or C<"auto">) if
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you use the C<dom0_mem> hypervisor command line to reduce the amount
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of memory given to domain 0 by default.
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Default: C<"auto">
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=item B<run_hotplug_scripts=BOOLEAN>
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If disabled hotplug scripts will be called from udev, as it used to
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be in the previous releases. With the default option, hotplug scripts
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will be launched by xl directly.
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Default: C<1>
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=item B<lockfile="PATH">
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Sets the path to the lock file used by xl to serialise certain
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operations (primarily domain creation).
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Default: C</var/lock/xl>
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=item B<vif.default.script="PATH">
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Configures the default hotplug script used by virtual network devices.
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The old B<vifscript> option is deprecated and should not be used.
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Default: C</etc/xen/scripts/vif-bridge>
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=item B<vif.default.bridge="NAME">
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Configures the default bridge to set for virtual network devices.
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The old B<defaultbridge> option is deprecated and should not be used.
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Default: C<xenbr0>
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=item B<vif.default.backend="NAME">
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Configures the default backend to set for virtual network devices.
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Default: C<0>
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=item B<vif.default.gatewaydev="NAME">
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Configures the default gateway device to set for virtual network devices.
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Default: C<None>
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=item B<remus.default.netbufscript="PATH">
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Configures the default script used by Remus to setup network buffering.
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Default: C</etc/xen/scripts/remus-netbuf-setup>
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=item B<colo.default.proxyscript="PATH">
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Configures the default script used by COLO to setup colo-proxy.
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Default: C</etc/xen/scripts/colo-proxy-setup>
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=item B<output_format="json|sxp">
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Configures the default output format used by xl when printing "machine
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readable" information. The default is to use the C<JSON>
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L<http://www.json.org/> syntax. However for compatibility with the
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previous C<xm> toolstack this can be configured to use the old C<SXP>
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(S-Expression-like) syntax instead.
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Default: C<json>
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=item B<blkdev_start="NAME">
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Configures the name of the first block device to be used for temporary
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block device allocations by the toolstack.
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The default choice is "xvda".
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=item B<claim_mode=BOOLEAN>
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If this option is enabled then when a guest is created there will be an
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guarantee that there is memory available for the guest. This is an
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particularly acute problem on hosts with memory over-provisioned guests
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that use tmem and have self-balloon enabled (which is the default
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option). The self-balloon mechanism can deflate/inflate the balloon
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quickly and the amount of free memory (which C<xl info> can show) is
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stale the moment it is printed. When claim is enabled a reservation for
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the amount of memory (see 'memory' in xl.conf(5)) is set, which is then
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reduced as the domain's memory is populated and eventually reaches zero.
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The free memory in C<xl info> is the combination of the hypervisor's
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free heap memory minus the outstanding claims value.
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If the reservation cannot be meet the guest creation fails immediately
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instead of taking seconds/minutes (depending on the size of the guest)
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while the guest is populated.
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Note that to enable tmem type guests, one needs to provide C<tmem> on the
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Xen hypervisor argument and as well on the Linux kernel command line.
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Note that the claim call is not attempted if C<superpages> option is
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used in the guest config (see xl.cfg(5)).
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Default: C<1>
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=over 4
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=item C<0>
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No claim is made. Memory population during guest creation will be
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attempted as normal and may fail due to memory exhaustion.
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=item C<1>
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Normal memory and freeable pool of ephemeral pages (tmem) is used when
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calculating whether there is enough memory free to launch a guest.
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This guarantees immediate feedback whether the guest can be launched due
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to memory exhaustion (which can take a long time to find out if launching
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massively huge guests).
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=back
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=back
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=head1 SEE ALSO
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=over 4
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=item L<xl(1)>
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=item L<xl.cfg(5)>
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=item http://www.json.org/
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=back
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