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

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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 x.__class__.__doc__ for signature
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ListInstances(self)
Get the list of running instances.
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GetInstanceInfo(self, instance_name)
Get instance properties.
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GetAllInstancesInfo(self)
Get properties of all instances.
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StartInstance(self, instance, block_devices)
Start an instance.
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StopInstance(self, instance, force=False, retry=False, name=None)
Stop an instance.
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CleanupInstance(self, instance_name)
Cleanup after a stopped instance
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RebootInstance(self, instance)
Reboot an instance.
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GetNodeInfo(self)
Return information about the node.
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Verify(self)
Verify the hypervisor.
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MigrateInstance(self, instance, target, live)
Migrate an instance.
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Inherited from hv_base.BaseHypervisor: AcceptInstance, FinalizeMigration, MigrationInfo

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.
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GetShellCommandForConsole(cls, instance, hvparams, beparams)
Return a command for connecting to the console of an instance.
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PowercycleNode(cls)
Chroot powercycle, just a wrapper over Linux powercycle.
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Inherited from hv_base.BaseHypervisor: CheckParameterSyntax, GetAncillaryFiles, LinuxPowercycle, ValidateParameters

Static Methods [hide private]
 
_IsDirLive(path)
Check if a directory looks like a live chroot.
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_GetMountSubdirs(path)
Return the list of mountpoints under a given path.
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Inherited from hv_base.BaseHypervisor: GetLinuxNodeInfo

Class Variables [hide private]
  _ROOT_DIR = constants.RUN_GANETI_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, CAN_MIGRATE

Properties [hide private]

Inherited from object: __class__

Method Details [hide private]

__init__(self)
(Constructor)

source code 

x.__init__(...) initializes x; see x.__class__.__doc__ for signature

Overrides: object.__init__
(inherited documentation)

ListInstances(self)

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Get the list of running instances.

Overrides: hv_base.BaseHypervisor.ListInstances

GetInstanceInfo(self, instance_name)

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Get instance properties.

Parameters:
  • instance_name (string) - the instance name
Returns:
(name, id, memory, vcpus, stat, times)
Overrides: hv_base.BaseHypervisor.GetInstanceInfo

GetAllInstancesInfo(self)

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Get properties of all instances.

Returns:
[(name, id, memory, vcpus, stat, times),...]
Overrides: hv_base.BaseHypervisor.GetAllInstancesInfo

StartInstance(self, instance, block_devices)

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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)

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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
Overrides: hv_base.BaseHypervisor.StopInstance

CleanupInstance(self, instance_name)

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Cleanup after a stopped instance

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

RebootInstance(self, instance)

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Reboot an instance.

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

Overrides: hv_base.BaseHypervisor.RebootInstance

GetNodeInfo(self)

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Return information about the node.

This is just a wrapper over the base GetLinuxNodeInfo method.

Returns:
a dict with the following keys (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
Overrides: hv_base.BaseHypervisor.GetNodeInfo

GetShellCommandForConsole(cls, instance, hvparams, beparams)
Class Method

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Return a command for connecting to the console of an instance.

Overrides: hv_base.BaseHypervisor.GetShellCommandForConsole

Verify(self)

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Verify the hypervisor.

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

Overrides: hv_base.BaseHypervisor.Verify

PowercycleNode(cls)
Class Method

source code 

Chroot powercycle, just a wrapper over Linux powercycle.

Overrides: hv_base.BaseHypervisor.PowercycleNode

MigrateInstance(self, instance, target, live)

source code 

Migrate an instance.

Parameters:
  • 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

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),}