Module hv_xen

Helper function for _GetInstanceList to retrieve the list of instances from xen.

Parameters:

• fn (callable) - Function to query xen for the list of instances
• instance_list_errors (list) - Error list

Returns: list

Parses the output of listing instances by xen.

Parameters:

• lines (list) - Result of retrieving the instance list from xen
• include_node (boolean) - If True, return information for Dom0

Returns:

list of tuple containing (name, id, memory, vcpus, state, time spent)

Return the list of running instances.

See _RunInstanceList and _ParseInstanceList for parameter details.

Determine whether an instance is running.

An instance is running if it is in the following Xen states: running, blocked, or paused.

For some strange reason, Xen once printed 'rb----' which does not make any sense because an instance cannot be both running and blocked. Fortunately, for Ganeti 'running' or 'blocked' is the same as 'running'.

A state of nothing '------' means that the domain is runnable but it is not currently running. That means it is in the queue behind other domains waiting to be scheduled to run. http://old-list-archives.xenproject.org/xen-users/2007-06/msg00849.html

Parameters:

• instance_info (string) - Information about instance, as supplied by Xen.

Returns: bool

Whether an instance is running.

Return information about the node.

Returns:

a dict with 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
• nr_cpus: total number of CPUs
• nr_nodes: in a NUMA system, the number of domains
• nr_sockets: the number of physical CPU sockets in the node
• hv_version: the hypervisor version in the form (major, minor)

Updates node information from _ParseNodeInfo with instance info.

Parameters:

• info (dict) - Result from _ParseNodeInfo
• instance_list (list of tuples) - list of instance information; one tuple per instance

Returns: dict

Combines _MergeInstanceInfo and _ParseNodeInfo.

Parameters:

• instance_list (list of tuples) - list of instance information; one tuple per instance

Get disk directives for Xen config file.

This method builds the xen config disk directive according to the given disk_template and block_devices.

Parameters:

• block_devices - list of tuples (cfdev, rldev):
  • cfdev: dict containing ganeti config disk part
  • rldev: ganeti.block.bdev.BlockDev object
• blockdev_prefix - a string containing blockdevice prefix, e.g. "sd" for /dev/sda

Returns:

string containing disk directive for xen instance config file

Add quotes around the CPUID field only if necessary.

Xen CPUID fields come in two shapes: LIBXL strings, which need quotes around them, and lists of XEND strings, which don't.

Parameters:

• data - Either type of parameter.

Returns:

The quoted version thereof.

_FILE_DRIVER_MAP

Value:

{constants.FD_LOOP: "file", constants.FD_BLKTAP: "tap:aio", constants. FD_BLKTAP2: "tap2:tapdisk:aio",}