[libvirt] [PATCH] add migration support for OpenVZ driver
Hongbin Lu
hongbin034 at gmail.com
Wed Sep 3 12:41:20 UTC 2014
Resent the email below. Thanks.
On Sun, Aug 31, 2014 at 2:05 PM, Hongbin Lu <hongbin034 at gmail.com> wrote:
> This patch adds initial migration support to the OpenVZ driver,
> using the VIR_DRV_FEATURE_MIGRATION_PARAMS family of migration
> functions.
> ---
> src/openvz/openvz_conf.h | 5 +-
> src/openvz/openvz_driver.c | 348
> ++++++++++++++++++++++++++++++++++++++++++++
> src/openvz/openvz_driver.h | 10 ++
> 3 files changed, 361 insertions(+), 2 deletions(-)
>
> diff --git a/src/openvz/openvz_conf.h b/src/openvz/openvz_conf.h
> index a7de7d2..33998d6 100644
> --- a/src/openvz/openvz_conf.h
> +++ b/src/openvz/openvz_conf.h
> @@ -35,8 +35,9 @@
>
>
> /* OpenVZ commands - Replace with wrapper scripts later? */
> -# define VZLIST "/usr/sbin/vzlist"
> -# define VZCTL "/usr/sbin/vzctl"
> +# define VZLIST "/usr/sbin/vzlist"
> +# define VZCTL "/usr/sbin/vzctl"
> +# define VZMIGRATE "/usr/sbin/vzmigrate"
> # define VZ_CONF_FILE "/etc/vz/vz.conf"
>
> # define VZCTL_BRIDGE_MIN_VERSION ((3 * 1000 * 1000) + (0 * 1000) + 22 +
> 1)
> diff --git a/src/openvz/openvz_driver.c b/src/openvz/openvz_driver.c
> index 851ed30..0f46872 100644
> --- a/src/openvz/openvz_driver.c
> +++ b/src/openvz/openvz_driver.c
> @@ -2207,6 +2207,348 @@ openvzNodeGetCPUMap(virConnectPtr conn
> ATTRIBUTE_UNUSED,
> }
>
>
> +static int
> +openvzConnectSupportsFeature(virConnectPtr conn ATTRIBUTE_UNUSED, int
> feature)
> +{
> + switch (feature) {
> + case VIR_DRV_FEATURE_MIGRATION_PARAMS:
> + case VIR_DRV_FEATURE_MIGRATION_V3:
> + return 1;
> + default:
> + return 0;
> + }
> +}
> +
> +
> +static char *
> +openvzDomainMigrateBegin3Params(virDomainPtr domain,
> + virTypedParameterPtr params,
> + int nparams,
> + char **cookieout ATTRIBUTE_UNUSED,
> + int *cookieoutlen ATTRIBUTE_UNUSED,
> + unsigned int flags)
> +{
> + virDomainObjPtr vm = NULL;
> + struct openvz_driver *driver = domain->conn->privateData;
> + char *xml = NULL;
> + int status;
> +
> + virCheckFlags(OPENVZ_MIGRATION_FLAGS, NULL);
> + if (virTypedParamsValidate(params, nparams,
> OPENVZ_MIGRATION_PARAMETERS) < 0)
> + return NULL;
> +
> + openvzDriverLock(driver);
> + vm = virDomainObjListFindByUUID(driver->domains, domain->uuid);
> + openvzDriverUnlock(driver);
> +
> + if (!vm) {
> + virReportError(VIR_ERR_NO_DOMAIN, "%s",
> + _("no domain with matching uuid"));
> + goto cleanup;
> + }
> +
> + if (!virDomainObjIsActive(vm)) {
> + virReportError(VIR_ERR_OPERATION_INVALID,
> + "%s", _("domain is not running"));
> + goto cleanup;
> + }
> +
> + if (openvzGetVEStatus(vm, &status, NULL) == -1)
> + goto cleanup;
> +
> + if (status != VIR_DOMAIN_RUNNING) {
> + virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
> + _("domain is not in running state"));
> + goto cleanup;
> + }
> +
> + xml = virDomainDefFormat(vm->def, VIR_DOMAIN_XML_SECURE);
> +
> + cleanup:
> + if (vm)
> + virObjectUnlock(vm);
> + return xml;
> +}
> +
> +static int
> +openvzDomainMigratePrepare3Params(virConnectPtr dconn,
> + virTypedParameterPtr params,
> + int nparams,
> + const char *cookiein ATTRIBUTE_UNUSED,
> + int cookieinlen ATTRIBUTE_UNUSED,
> + char **cookieout ATTRIBUTE_UNUSED,
> + int *cookieoutlen ATTRIBUTE_UNUSED,
> + char **uri_out,
> + unsigned int fflags ATTRIBUTE_UNUSED)
> +{
> + struct openvz_driver *driver = dconn->privateData;
> + const char *dom_xml = NULL;
> + const char *uri_in = NULL;
> + virDomainDefPtr def = NULL;
> + virDomainObjPtr vm = NULL;
> + char *hostname = NULL;
> + virURIPtr uri = NULL;
> + int ret = -1;
> +
> + if (virTypedParamsValidate(params, nparams,
> OPENVZ_MIGRATION_PARAMETERS) < 0)
> + goto error;
> +
> + if (virTypedParamsGetString(params, nparams,
> + VIR_MIGRATE_PARAM_DEST_XML,
> + &dom_xml) < 0 ||
> + virTypedParamsGetString(params, nparams,
> + VIR_MIGRATE_PARAM_URI,
> + &uri_in) < 0)
> + goto error;
> +
> + if (!dom_xml) {
> + virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
> + _("no domain XML passed"));
> + goto error;
> + }
> +
> + if (!(def = virDomainDefParseString(dom_xml, driver->caps,
> driver->xmlopt,
> + 1 << VIR_DOMAIN_VIRT_OPENVZ,
> + VIR_DOMAIN_XML_INACTIVE)))
> + goto error;
> +
> + if (!(vm = virDomainObjListAdd(driver->domains, def,
> + driver->xmlopt,
> + VIR_DOMAIN_OBJ_LIST_ADD_LIVE |
> + VIR_DOMAIN_OBJ_LIST_ADD_CHECK_LIVE,
> + NULL)))
> + goto error;
> + def = NULL;
> +
> + if (!uri_in) {
> + if ((hostname = virGetHostname()) == NULL)
> + goto error;
> +
> + if (STRPREFIX(hostname, "localhost")) {
> + virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
> + _("hostname on destination resolved to
> localhost,"
> + " but migration requires an FQDN"));
> + goto error;
> + }
> + } else {
> + uri = virURIParse(uri_in);
> +
> + if (uri == NULL) {
> + virReportError(VIR_ERR_INVALID_ARG,
> + _("unable to parse URI: %s"),
> + uri_in);
> + goto error;
> + }
> +
> + if (uri->server == NULL) {
> + virReportError(VIR_ERR_INVALID_ARG,
> + _("missing host in migration URI: %s"),
> + uri_in);
> + goto error;
> + } else {
> + hostname = uri->server;
> + }
> + }
> +
> + if (virAsprintf(uri_out, "tcp://%s", hostname) < 0)
> + goto error;
> +
> + ret = 0;
> + goto done;
> +
> + error:
> + virDomainDefFree(def);
> + if (vm) {
> + virDomainObjListRemove(driver->domains, vm);
> + vm = NULL;
> + }
> +
> + done:
> + virURIFree(uri);
> + if (vm)
> + virObjectUnlock(vm);
> + return ret;
> +}
> +
> +static int
> +openvzDomainMigratePerform3Params(virDomainPtr domain,
> + const char *dconnuri ATTRIBUTE_UNUSED,
> + virTypedParameterPtr params,
> + int nparams,
> + const char *cookiein ATTRIBUTE_UNUSED,
> + int cookieinlen ATTRIBUTE_UNUSED,
> + char **cookieout ATTRIBUTE_UNUSED,
> + int *cookieoutlen ATTRIBUTE_UNUSED,
> + unsigned int flags)
> +{
> + struct openvz_driver *driver = domain->conn->privateData;
> + virDomainObjPtr vm = NULL;
> + const char *uri_str = NULL;
> + virURIPtr uri = NULL;
> + virCommandPtr cmd = virCommandNew(VZMIGRATE);
> + int ret = -1;
> +
> + virCheckFlags(OPENVZ_MIGRATION_FLAGS, -1);
> + if (virTypedParamsValidate(params, nparams,
> OPENVZ_MIGRATION_PARAMETERS) < 0)
> + goto cleanup;
> +
> + if (virTypedParamsGetString(params, nparams,
> + VIR_MIGRATE_PARAM_URI,
> + &uri_str) < 0)
> + goto cleanup;
> +
> + openvzDriverLock(driver);
> + vm = virDomainObjListFindByUUID(driver->domains, domain->uuid);
> + openvzDriverUnlock(driver);
> +
> + if (!vm) {
> + virReportError(VIR_ERR_NO_DOMAIN, "%s",
> + _("no domain with matching uuid"));
> + goto cleanup;
> + }
> +
> + /* parse dst host:port from uri */
> + uri = virURIParse(uri_str);
> + if (uri == NULL || uri->server == NULL)
> + goto cleanup;
> +
> + if (flags & VIR_MIGRATE_LIVE)
> + virCommandAddArg(cmd, "--live");
> + virCommandAddArg(cmd, uri->server);
> + virCommandAddArg(cmd, vm->def->name);
> +
> + if (virCommandRun(cmd, NULL) < 0)
> + goto cleanup;
> +
> + ret = 0;
> +
> + cleanup:
> + virCommandFree(cmd);
> + virURIFree(uri);
> + if (vm)
> + virObjectUnlock(vm);
> + return ret;
> +}
> +
> +static virDomainPtr
> +openvzDomainMigrateFinish3Params(virConnectPtr dconn,
> + virTypedParameterPtr params,
> + int nparams,
> + const char *cookiein ATTRIBUTE_UNUSED,
> + int cookieinlen ATTRIBUTE_UNUSED,
> + char **cookieout ATTRIBUTE_UNUSED,
> + int *cookieoutlen ATTRIBUTE_UNUSED,
> + unsigned int flags,
> + int cancelled)
> +{
> + struct openvz_driver *driver = dconn->privateData;
> + virDomainObjPtr vm = NULL;
> + const char *dname = NULL;
> + virDomainPtr dom = NULL;
> + int status;
> +
> + if (cancelled)
> + goto cleanup;
> +
> + virCheckFlags(OPENVZ_MIGRATION_FLAGS, NULL);
> + if (virTypedParamsValidate(params, nparams,
> OPENVZ_MIGRATION_PARAMETERS) < 0)
> + goto cleanup;
> +
> + if (virTypedParamsGetString(params, nparams,
> + VIR_MIGRATE_PARAM_DEST_NAME,
> + &dname) < 0)
> + goto cleanup;
> +
> + if (!dname ||
> + !(vm = virDomainObjListFindByName(driver->domains, dname))) {
> + /* Migration obviously failed if the domain doesn't exist */
> + virReportError(VIR_ERR_OPERATION_FAILED,
> + _("Migration failed. No domain on destination host
> "
> + "with matching name '%s'"),
> + NULLSTR(dname));
> + goto cleanup;
> + }
> +
> + if (openvzGetVEStatus(vm, &status, NULL) == -1)
> + goto cleanup;
> +
> + if (status != VIR_DOMAIN_RUNNING) {
> + virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
> + _("domain is not running on destination host"));
> + goto cleanup;
> + }
> +
> + vm->def->id = strtoI(vm->def->name);
> + virDomainObjSetState(vm, VIR_DOMAIN_RUNNING,
> VIR_DOMAIN_RUNNING_MIGRATED);
> +
> + dom = virGetDomain(dconn, vm->def->name, vm->def->uuid);
> + if (dom)
> + dom->id = vm->def->id;
> +
> + cleanup:
> + if (vm)
> + virObjectUnlock(vm);
> + return dom;
> +}
> +
> +static int
> +openvzDomainMigrateConfirm3Params(virDomainPtr domain,
> + virTypedParameterPtr params,
> + int nparams,
> + const char *cookiein ATTRIBUTE_UNUSED,
> + int cookieinlen ATTRIBUTE_UNUSED,
> + unsigned int flags,
> + int cancelled)
> +{
> + struct openvz_driver *driver = domain->conn->privateData;
> + virDomainObjPtr vm = NULL;
> + int status;
> + int ret = -1;
> +
> + virCheckFlags(OPENVZ_MIGRATION_FLAGS, -1);
> + if (virTypedParamsValidate(params, nparams,
> OPENVZ_MIGRATION_PARAMETERS) < 0)
> + goto cleanup;
> +
> + openvzDriverLock(driver);
> + vm = virDomainObjListFindByUUID(driver->domains, domain->uuid);
> + openvzDriverUnlock(driver);
> +
> + if (!vm) {
> + virReportError(VIR_ERR_NO_DOMAIN, "%s",
> + _("no domain with matching uuid"));
> + goto cleanup;
> + }
> +
> + if (cancelled) {
> + if (openvzGetVEStatus(vm, &status, NULL) == -1)
> + goto cleanup;
> +
> + if (status == VIR_DOMAIN_RUNNING) {
> + ret = 0;
> + } else {
> + VIR_DEBUG("Domain '%s' does not recover after failed
> migration",
> + vm->def->name);
> + }
> +
> + goto cleanup;
> + }
> +
> + vm->def->id = -1;
> +
> + VIR_DEBUG("Domain '%s' successfully migrated", vm->def->name);
> +
> + virDomainObjListRemove(driver->domains, vm);
> + vm = NULL;
> +
> + ret = 0;
> +
> + cleanup:
> + if (vm)
> + virObjectUnlock(vm);
> + return ret;
> +}
> +
> +
> static virDriver openvzDriver = {
> .no = VIR_DRV_OPENVZ,
> .name = "OPENVZ",
> @@ -2265,6 +2607,12 @@ static virDriver openvzDriver = {
> .connectIsAlive = openvzConnectIsAlive, /* 0.9.8 */
> .domainUpdateDeviceFlags = openvzDomainUpdateDeviceFlags, /* 0.9.13 */
> .domainGetHostname = openvzDomainGetHostname, /* 0.10.0 */
> + .connectSupportsFeature = openvzConnectSupportsFeature, /* 1.2.8 */
> + .domainMigrateBegin3Params = openvzDomainMigrateBegin3Params, /*
> 1.2.8 */
> + .domainMigratePrepare3Params = openvzDomainMigratePrepare3Params, /*
> 1.2.8 */
> + .domainMigratePerform3Params = openvzDomainMigratePerform3Params, /*
> 1.2.8 */
> + .domainMigrateFinish3Params = openvzDomainMigrateFinish3Params, /*
> 1.2.8 */
> + .domainMigrateConfirm3Params = openvzDomainMigrateConfirm3Params, /*
> 1.2.8 */
> };
>
> int openvzRegister(void)
> diff --git a/src/openvz/openvz_driver.h b/src/openvz/openvz_driver.h
> index b39e81c..0c7a070 100644
> --- a/src/openvz/openvz_driver.h
> +++ b/src/openvz/openvz_driver.h
> @@ -31,6 +31,16 @@
>
> # include "internal.h"
>
> +# define OPENVZ_MIGRATION_FLAGS \
> + (VIR_MIGRATE_LIVE)
> +
> +/* All supported migration parameters and their types. */
> +# define OPENVZ_MIGRATION_PARAMETERS \
> + VIR_MIGRATE_PARAM_URI, VIR_TYPED_PARAM_STRING, \
> + VIR_MIGRATE_PARAM_DEST_NAME, VIR_TYPED_PARAM_STRING, \
> + VIR_MIGRATE_PARAM_DEST_XML, VIR_TYPED_PARAM_STRING, \
> + NULL
> +
> int openvzRegister(void);
>
> #endif
> --
> 1.7.1
>
>
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