4 # Copyright (C) 2006, 2007, 2008 Google Inc.
6 # This program is free software; you can redistribute it and/or modify
7 # it under the terms of the GNU General Public License as published by
8 # the Free Software Foundation; either version 2 of the License, or
9 # (at your option) any later version.
11 # This program is distributed in the hope that it will be useful, but
12 # WITHOUT ANY WARRANTY; without even the implied warranty of
13 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 # General Public License for more details.
16 # You should have received a copy of the GNU General Public License
17 # along with this program; if not, write to the Free Software
18 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
30 from ganeti import utils
31 from ganeti import constants
32 from ganeti import errors
33 from ganeti.hypervisor import BaseHypervisor
36 class FakeHypervisor(BaseHypervisor.BaseHypervisor):
37 """Fake hypervisor interface.
39 This can be used for testing the ganeti code without having to have
40 a real virtualisation software installed.
43 _ROOT_DIR = constants.RUN_DIR + "/ganeti-fake-hypervisor"
46 BaseHypervisor.__init__(self)
47 if not os.path.exists(self._ROOT_DIR):
48 os.mkdir(self._ROOT_DIR)
50 def ListInstances(self):
51 """Get the list of running instances.
54 return os.listdir(self._ROOT_DIR)
56 def GetInstanceInfo(self, instance_name):
57 """Get instance properties.
60 instance_name: the instance name
63 (name, id, memory, vcpus, stat, times)
65 file_name = "%s/%s" % (self._ROOT_DIR, instance_name)
66 if not os.path.exists(file_name):
69 fh = file(file_name, "r")
71 inst_id = fh.readline().strip()
72 memory = fh.readline().strip()
73 vcpus = fh.readline().strip()
76 return (instance_name, inst_id, memory, vcpus, stat, times)
80 raise errors.HypervisorError("Failed to list instance %s: %s" %
83 def GetAllInstancesInfo(self):
84 """Get properties of all instances.
87 [(name, id, memory, vcpus, stat, times),...]
90 for file_name in os.listdir(self._ROOT_DIR):
92 fh = file(self._ROOT_DIR+"/"+file_name, "r")
98 inst_id = fh.readline().strip()
99 memory = fh.readline().strip()
100 vcpus = fh.readline().strip()
105 data.append((file_name, inst_id, memory, vcpus, stat, times))
107 raise errors.HypervisorError("Failed to list instances: %s" % err)
110 def StartInstance(self, instance, force, extra_args):
111 """Start an instance.
113 For the fake hypervisor, it just creates a file in the base dir,
114 creating an exception if it already exists. We don't actually
115 handle race conditions properly, since these are *FAKE* instances.
118 file_name = self._ROOT_DIR + "/%s" % instance.name
119 if os.path.exists(file_name):
120 raise errors.HypervisorError("Failed to start instance %s: %s" %
121 (instance.name, "already running"))
123 fh = file(file_name, "w")
125 fh.write("0\n%d\n%d\n" % (instance.memory, instance.vcpus))
129 raise errors.HypervisorError("Failed to start instance %s: %s" %
130 (instance.name, err))
132 def StopInstance(self, instance, force=False):
135 For the fake hypervisor, this just removes the file in the base
136 dir, if it exist, otherwise we raise an exception.
139 file_name = self._ROOT_DIR + "/%s" % instance.name
140 if not os.path.exists(file_name):
141 raise errors.HypervisorError("Failed to stop instance %s: %s" %
142 (instance.name, "not running"))
143 utils.RemoveFile(file_name)
145 def RebootInstance(self, instance):
146 """Reboot an instance.
148 For the fake hypervisor, this does nothing.
153 def GetNodeInfo(self):
154 """Return information about the node.
156 The return value is a dict, which has to have the following items:
158 - memory_total: the total memory size on the node
159 - memory_free: the available memory on the node for instances
160 - memory_dom0: the memory used by the node itself, if available
163 # global ram usage from the xm info command
166 # note: in xen 3, memory has changed to total_memory
168 fh = file("/proc/meminfo")
170 data = fh.readlines()
174 raise errors.HypervisorError("Failed to list node info: %s" % err)
179 splitfields = line.split(":", 1)
181 if len(splitfields) > 1:
182 key = splitfields[0].strip()
183 val = splitfields[1].strip()
184 if key == 'MemTotal':
185 result['memory_total'] = int(val.split()[0])/1024
186 elif key in ('MemFree', 'Buffers', 'Cached'):
187 sum_free += int(val.split()[0])/1024
188 elif key == 'Active':
189 result['memory_dom0'] = int(val.split()[0])/1024
190 result['memory_free'] = sum_free
194 fh = open("/proc/cpuinfo")
196 cpu_total = len(re.findall("(?m)^processor\s*:\s*[0-9]+\s*$",
200 except EnvironmentError, err:
201 raise HypervisorError("Failed to list node info: %s" % err)
202 result['cpu_total'] = cpu_total
207 def GetShellCommandForConsole(instance):
208 """Return a command for connecting to the console of an instance.
211 return "echo Console not available for fake hypervisor"
214 """Verify the hypervisor.
216 For the fake hypervisor, it just checks the existence of the base
220 if not os.path.exists(self._ROOT_DIR):
221 return "The required directory '%s' does not exist." % self._ROOT_DIR