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Offline migration transfers inactive definition of a domain (which may or may not be active). After successful completion, the domain remains in its current state on source host and is defined but inactive on destination host. It's a bit more clever than virDomainGetXMLDesc() on source host followed by virDomainDefineXML() on destination host, as offline migration will run pre-migration hook to update the domain XML on destination host. Currently, copying non-shared storage is not supported during offline migration. Offline migration can be requested with a new migration flag called VIR_MIGRATE_OFFLINE (which has to be combined with VIR_MIGRATE_PERSIST_DEST flag).
225 lines
8.7 KiB
C
225 lines
8.7 KiB
C
/*
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* libvirt.h: publically exported APIs, not for public use
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*
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* Copyright (C) 2006-2008, 2011 Red Hat, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see
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* <http://www.gnu.org/licenses/>.
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*
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* NB This file is ABI sensitive. Things here impact the wire
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* protocol ABI in the remote driver. Same rules as for things
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* include/libvirt/libvirt.h apply. ie this file is *append* only
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*/
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#ifndef __LIBVIRT_H_
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# define __LIBVIRT_H_
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# include "internal.h"
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# ifdef WITH_LIBVIRTD
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typedef void (*virStateInhibitCallback)(bool inhibit,
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void *opaque);
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int virStateInitialize(bool privileged,
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virStateInhibitCallback inhibit,
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void *opaque);
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int virStateCleanup(void);
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int virStateReload(void);
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int virStateStop(void);
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# endif
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/* Feature detection. This is a libvirt-private interface for determining
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* what features are supported by the driver.
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*
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* The remote driver passes features through to the real driver at the
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* remote end unmodified, except if you query a VIR_DRV_FEATURE_REMOTE*
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* feature. Queries for VIR_DRV_FEATURE_PROGRAM* features are answered
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* directly by the RPC layer and not by the real driver.
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*/
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enum {
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/* Driver supports V1-style virDomainMigrate, ie. domainMigratePrepare/
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* domainMigratePerform/domainMigrateFinish.
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*/
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VIR_DRV_FEATURE_MIGRATION_V1 = 1,
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/* Driver is not local. */
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VIR_DRV_FEATURE_REMOTE = 2,
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/* Driver supports V2-style virDomainMigrate, ie. domainMigratePrepare2/
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* domainMigratePerform/domainMigrateFinish2.
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*/
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VIR_DRV_FEATURE_MIGRATION_V2 = 3,
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/* Driver supports peer-2-peer virDomainMigrate ie source host
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* does all the prepare/perform/finish steps directly
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*/
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VIR_DRV_FEATURE_MIGRATION_P2P = 4,
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/* Driver supports migration with only the source host involved,
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* no libvirtd connetions on the destination at all, only the
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* perform step is used.
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*/
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VIR_DRV_FEATURE_MIGRATION_DIRECT = 5,
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/*
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* Driver supports V3-style virDomainMigrate, ie domainMigrateBegin3/
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* domainMigratePrepare3/domainMigratePerform3/domainMigrateFinish3/
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* domainMigrateConfirm3.
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*/
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VIR_DRV_FEATURE_MIGRATION_V3 = 6,
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/*
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* Driver supports protecting the whole V3-style migration against changes
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* to domain configuration, i.e., starting from Begin3 and not Perform3.
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*/
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VIR_DRV_FEATURE_MIGRATE_CHANGE_PROTECTION = 7,
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/*
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* Support for file descriptor passing
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*/
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VIR_DRV_FEATURE_FD_PASSING = 8,
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/*
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* Support for VIR_TYPED_PARAM_STRING
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*/
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VIR_DRV_FEATURE_TYPED_PARAM_STRING = 9,
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/*
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* Remote party supports keepalive program (i.e., sending keepalive
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* messages).
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*/
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VIR_DRV_FEATURE_PROGRAM_KEEPALIVE = 10,
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/*
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* Support for VIR_DOMAIN_XML_MIGRATABLE flag in domainGetXMLDesc
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*/
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VIR_DRV_FEATURE_XML_MIGRATABLE = 11,
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/*
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* Support for offline migration.
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*/
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VIR_DRV_FEATURE_MIGRATION_OFFLINE = 12,
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};
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int virDrvSupportsFeature (virConnectPtr conn, int feature);
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int virDomainMigratePrepare (virConnectPtr dconn,
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char **cookie,
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int *cookielen,
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const char *uri_in,
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char **uri_out,
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unsigned long flags,
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const char *dname,
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unsigned long resource);
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int virDomainMigratePerform (virDomainPtr domain,
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const char *cookie,
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int cookielen,
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const char *uri,
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unsigned long flags,
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const char *dname,
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unsigned long resource);
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virDomainPtr virDomainMigrateFinish (virConnectPtr dconn,
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const char *dname,
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const char *cookie,
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int cookielen,
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const char *uri,
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unsigned long flags);
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int virDomainMigratePrepare2 (virConnectPtr dconn,
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char **cookie,
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int *cookielen,
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const char *uri_in,
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char **uri_out,
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unsigned long flags,
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const char *dname,
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unsigned long resource,
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const char *dom_xml);
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virDomainPtr virDomainMigrateFinish2 (virConnectPtr dconn,
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const char *dname,
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const char *cookie,
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int cookielen,
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const char *uri,
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unsigned long flags,
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int retcode);
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int virDomainMigratePrepareTunnel(virConnectPtr dconn,
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virStreamPtr st,
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unsigned long flags,
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const char *dname,
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unsigned long resource,
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const char *dom_xml);
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char *virDomainMigrateBegin3(virDomainPtr domain,
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const char *xmlin,
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char **cookieout,
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int *cookieoutlen,
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unsigned long flags,
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const char *dname,
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unsigned long resource);
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int virDomainMigratePrepare3(virConnectPtr dconn,
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const char *cookiein,
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int cookieinlen,
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char **cookieout,
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int *cookieoutlen,
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const char *uri_in,
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char **uri_out,
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unsigned long flags,
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const char *dname,
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unsigned long resource,
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const char *dom_xml);
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int virDomainMigratePrepareTunnel3(virConnectPtr dconn,
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virStreamPtr st,
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const char *cookiein,
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int cookieinlen,
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char **cookieout,
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int *cookieoutlen,
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unsigned long flags,
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const char *dname,
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unsigned long resource,
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const char *dom_xml);
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int virDomainMigratePerform3(virDomainPtr dom,
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const char *xmlin,
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const char *cookiein,
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int cookieinlen,
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char **cookieout,
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int *cookieoutlen,
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const char *dconnuri, /* libvirtd URI if Peer2Peer, NULL otherwise */
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const char *uri, /* VM Migration URI */
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unsigned long flags,
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const char *dname,
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unsigned long resource);
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virDomainPtr virDomainMigrateFinish3(virConnectPtr dconn,
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const char *dname,
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const char *cookiein,
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int cookieinlen,
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char **cookieout,
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int *cookieoutlen,
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const char *dconnuri, /* libvirtd URI if Peer2Peer, NULL otherwise */
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const char *uri, /* VM Migration URI, NULL in tunnelled case */
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unsigned long flags,
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int cancelled); /* Kill the dst VM */
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int virDomainMigrateConfirm3(virDomainPtr domain,
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const char *cookiein,
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int cookieinlen,
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unsigned long flags,
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int restart); /* Restart the src VM */
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#endif
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