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Ganeti
ganeti :: hypervisor :: hv_chroot :: ChrootManager :: Class ChrootManager
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Class ChrootManager

source code

Chroot manager.

This not-really hypervisor allows ganeti to manage chroots. It has special behaviour and requirements on the OS definition and the node environemnt:

Instance Methods [hide private]
 
__init__(self)
x.__init__(...) initializes x; see help(type(x)) for signature		 source code
 
ListInstances(self, hvparams=None)
Get the list of running instances.		 source code
(string, string, int, int, HvInstanceState, int)
GetInstanceInfo(self, instance_name, hvparams=None)
Get instance properties.		 source code
(string, string, int, int, HvInstanceState, int)
GetAllInstancesInfo(self, hvparams=None)
Get properties of all instances.		 source code
 
StartInstance(self, instance, block_devices, startup_paused)
Start an instance.		 source code
 
StopInstance(self, instance, force=False, retry=False, name=None, timeout=None)
Stop an instance.		 source code
 
CleanupInstance(self, instance_name)
Cleanup after a stopped instance		 source code
 
RebootInstance(self, instance)
Reboot an instance.		 source code
 
BalloonInstanceMemory(self, instance, mem)
Balloon an instance memory to a certain value.		 source code
 
GetNodeInfo(self, hvparams=None)
Return information about the node.		 source code
 
Verify(self, hvparams=None)
Verify the hypervisor.		 source code
 
MigrateInstance(self, cluster_name, instance, target, live)
Migrate an instance.		 source code
objects.MigrationStatus
GetMigrationStatus(self, instance)
Get the migration status		 source code

Inherited from hv_base.BaseHypervisor: AcceptInstance, FinalizeMigrationDst, FinalizeMigrationSource, HotAddDevice, HotDelDevice, HotModDevice, HotplugSupported, MigrationInfo, VerifyHotplugSupport

Inherited from hv_base.BaseHypervisor (private): _InstanceStartupMemory

Inherited from object: __delattr__, __format__, __getattribute__, __hash__, __new__, __reduce__, __reduce_ex__, __repr__, __setattr__, __sizeof__, __str__, __subclasshook__

Class Methods [hide private]
 
_InstanceDir(cls, instance_name)
Return the root directory for an instance.		 source code
 
GetInstanceConsole(cls, instance, primary_node, node_group, hvparams, beparams, root_dir=None)
Return information for connecting to the console of an instance.		 source code
 
PowercycleNode(cls, hvparams=None)
Chroot powercycle, just a wrapper over Linux powercycle.		 source code

Inherited from hv_base.BaseHypervisor: CheckParameterSyntax, GetAncillaryFiles, LinuxPowercycle, ValidateParameters

Inherited from hv_base.BaseHypervisor (private): _IsParamValueUnspecified

Static Methods [hide private]
 
_IsDirLive(path)
Check if a directory looks like a live chroot.		 source code
 
_GetMountSubdirs(path)
Return the list of mountpoints under a given path.		 source code

Inherited from hv_base.BaseHypervisor: GetLinuxNodeInfo, VersionsSafeForMigration

Inherited from hv_base.BaseHypervisor (private): _FormatVerifyResults

Class Variables [hide private]
  _ROOT_DIR = pathutils.RUN_DIR+ "/chroot-hypervisor"
  PARAMETERS = {constants.HV_INIT_SCRIPT:(True, utils.IsNormAbsP...
a dict of parameter name: check type; the check type is a five-tuple containing:

Inherited from hv_base.BaseHypervisor: ANCILLARY_FILES, ANCILLARY_FILES_OPT, CAN_MIGRATE

Properties [hide private]

Inherited from object: __class__

Method Details [hide private]

__init__(self)
(Constructor)

source code 

x.__init__(...) initializes x; see help(type(x)) for signature

Overrides: object.__init__
(inherited documentation)

ListInstances(self, hvparams=None)

source code 

Get the list of running instances.

Overrides: hv_base.BaseHypervisor.ListInstances

GetInstanceInfo(self, instance_name, hvparams=None)

source code 

Get instance properties.

Parameters:
  • instance_name (string) - the instance name
  • hvparams (dict of strings) - hvparams to be used with this instance
Returns: (string, string, int, int, HvInstanceState, int)
(name, id, memory, vcpus, stat, times)
Overrides: hv_base.BaseHypervisor.GetInstanceInfo

GetAllInstancesInfo(self, hvparams=None)

source code 

Get properties of all instances.

Parameters:
  • hvparams (dict of strings) - hypervisor parameter
Returns: (string, string, int, int, HvInstanceState, int)
[(name, id, memory, vcpus, stat, times),...]
Overrides: hv_base.BaseHypervisor.GetAllInstancesInfo

StartInstance(self, instance, block_devices, startup_paused)

source code 

Start an instance.

For the chroot manager, we try to mount the block device and execute '/ganeti-chroot start'.

Overrides: hv_base.BaseHypervisor.StartInstance

StopInstance(self, instance, force=False, retry=False, name=None, timeout=None)

source code 

Stop an instance.

This method has complicated cleanup tests, as we must:

  • try to kill all leftover processes
  • try to unmount any additional sub-mountpoints
  • finally unmount the instance dir
Parameters:
  • instance - instance to stop
  • force - whether to do a "hard" stop (destroy)
  • retry - whether this is just a retry call
  • name - if this parameter is passed, the the instance object should not be used (will be passed as None), and the shutdown must be done by name only
  • timeout - if the parameter is not None, a soft shutdown operation will be killed after the specified number of seconds. A hard (forced) shutdown cannot have a timeout
Raises:
Overrides: hv_base.BaseHypervisor.StopInstance

CleanupInstance(self, instance_name)

source code 

Cleanup after a stopped instance

Parameters:
  • instance_name - instance name to cleanup after
Overrides: hv_base.BaseHypervisor.CleanupInstance

RebootInstance(self, instance)

source code 

Reboot an instance.

This is not (yet) implemented for the chroot manager.

Overrides: hv_base.BaseHypervisor.RebootInstance

BalloonInstanceMemory(self, instance, mem)

source code 

Balloon an instance memory to a certain value.

Parameters:
  • instance (objects.Instance) - instance to be accepted
  • mem (int) - actual memory size to use for instance runtime
Overrides: hv_base.BaseHypervisor.BalloonInstanceMemory

GetNodeInfo(self, hvparams=None)

source code 

Return information about the node.

See BaseHypervisor.GetLinuxNodeInfo.

Parameters:
  • hvparams - hypervisor parameters
Returns:
a dict with at least the following keys (memory values in MiB):
  • memory_total: the total memory size on the node
  • memory_free: the available memory on the node for instances
  • memory_dom0: the memory used by the node itself, if available
  • cpu_total: total number of CPUs
  • cpu_dom0: number of CPUs used by the node OS
  • cpu_nodes: number of NUMA domains
  • cpu_sockets: number of physical CPU sockets
Overrides: hv_base.BaseHypervisor.GetNodeInfo

GetInstanceConsole(cls, instance, primary_node, node_group, hvparams, beparams, root_dir=None)
Class Method

source code 

Return information for connecting to the console of an instance.

Overrides: hv_base.BaseHypervisor.GetInstanceConsole

Verify(self, hvparams=None)

source code 

Verify the hypervisor.

For the chroot manager, it just checks the existence of the base dir.

Parameters:
  • hvparams (dict of strings) - hypervisor parameters to be verified against, not used in for chroot
Returns:
Problem description if something is wrong, None otherwise
Overrides: hv_base.BaseHypervisor.Verify

PowercycleNode(cls, hvparams=None)
Class Method

source code 

Chroot powercycle, just a wrapper over Linux powercycle.

Parameters:
  • hvparams (dict of strings) - hypervisor params to be used on this node
Overrides: hv_base.BaseHypervisor.PowercycleNode

MigrateInstance(self, cluster_name, instance, target, live)

source code 

Migrate an instance.

Parameters:
  • cluster_name (string) - name of the cluster
  • instance (objects.Instance) - the instance to be migrated
  • target (string) - hostname (usually ip) of the target node
  • live (boolean) - whether to do a live or non-live migration
Overrides: hv_base.BaseHypervisor.MigrateInstance

GetMigrationStatus(self, instance)

source code 

Get the migration status

Parameters:
Returns: objects.MigrationStatus
the status of the current migration (one of constants.HV_MIGRATION_VALID_STATUSES), plus any additional progress info that can be retrieved from the hypervisor
Overrides: hv_base.BaseHypervisor.GetMigrationStatus

Class Variable Details [hide private]

PARAMETERS

a dict of parameter name: check type; the check type is a five-tuple containing:
  • the required flag (boolean)
  • a function to check for syntax, that will be used in CheckParameterSyntax, in the master daemon process
  • an error message for the above function
  • a function to check for parameter validity on the remote node, in the ValidateParameters function
  • an error message for the above function
Value:
{constants.HV_INIT_SCRIPT:(True, utils.IsNormAbsPath, "must be an abso\
lute normalized path", None, None),}

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