root / lib / hypervisor.py @ d06565e0
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2 | a8083063 | Iustin Pop | #
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3 | a8083063 | Iustin Pop | |
4 | a8083063 | Iustin Pop | # Copyright (C) 2006, 2007 Google Inc.
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5 | a8083063 | Iustin Pop | #
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6 | a8083063 | Iustin Pop | # This program is free software; you can redistribute it and/or modify
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7 | a8083063 | Iustin Pop | # it under the terms of the GNU General Public License as published by
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8 | a8083063 | Iustin Pop | # the Free Software Foundation; either version 2 of the License, or
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9 | a8083063 | Iustin Pop | # (at your option) any later version.
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10 | a8083063 | Iustin Pop | #
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11 | a8083063 | Iustin Pop | # This program is distributed in the hope that it will be useful, but
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12 | a8083063 | Iustin Pop | # WITHOUT ANY WARRANTY; without even the implied warranty of
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13 | a8083063 | Iustin Pop | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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14 | a8083063 | Iustin Pop | # General Public License for more details.
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15 | a8083063 | Iustin Pop | #
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16 | a8083063 | Iustin Pop | # You should have received a copy of the GNU General Public License
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17 | a8083063 | Iustin Pop | # along with this program; if not, write to the Free Software
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18 | a8083063 | Iustin Pop | # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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19 | a8083063 | Iustin Pop | # 02110-1301, USA.
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20 | a8083063 | Iustin Pop | |
21 | a8083063 | Iustin Pop | |
22 | a8083063 | Iustin Pop | """Module that abstracts the virtualisation interface
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23 | a8083063 | Iustin Pop |
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24 | a8083063 | Iustin Pop | """
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25 | a8083063 | Iustin Pop | |
26 | a8083063 | Iustin Pop | import time |
27 | a8083063 | Iustin Pop | import os |
28 | a8083063 | Iustin Pop | from cStringIO import StringIO |
29 | a8083063 | Iustin Pop | |
30 | a8083063 | Iustin Pop | from ganeti import utils |
31 | a8083063 | Iustin Pop | from ganeti import logger |
32 | a8083063 | Iustin Pop | from ganeti import ssconf |
33 | f00b46bc | Michael Hanselmann | from ganeti import constants |
34 | a8083063 | Iustin Pop | from ganeti.errors import HypervisorError |
35 | a8083063 | Iustin Pop | |
36 | a8083063 | Iustin Pop | _HT_XEN30 = "xen-3.0"
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37 | a8083063 | Iustin Pop | _HT_FAKE = "fake"
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38 | a8083063 | Iustin Pop | |
39 | a8083063 | Iustin Pop | VALID_HTYPES = (_HT_XEN30, _HT_FAKE) |
40 | a8083063 | Iustin Pop | |
41 | a8083063 | Iustin Pop | def GetHypervisor(): |
42 | a8083063 | Iustin Pop | """Return a Hypervisor instance.
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43 | a8083063 | Iustin Pop |
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44 | a8083063 | Iustin Pop | This function parses the cluster hypervisor configuration file and
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45 | a8083063 | Iustin Pop | instantiates a class based on the value of this file.
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46 | a8083063 | Iustin Pop |
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47 | a8083063 | Iustin Pop | """
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48 | a8083063 | Iustin Pop | ht_kind = ssconf.SimpleStore().GetHypervisorType() |
49 | a8083063 | Iustin Pop | if ht_kind == _HT_XEN30:
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50 | a8083063 | Iustin Pop | cls = XenHypervisor |
51 | a8083063 | Iustin Pop | elif ht_kind == _HT_FAKE:
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52 | a8083063 | Iustin Pop | cls = FakeHypervisor |
53 | a8083063 | Iustin Pop | else:
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54 | 3ecf6786 | Iustin Pop | raise HypervisorError("Unknown hypervisor type '%s'" % ht_kind) |
55 | a8083063 | Iustin Pop | return cls()
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56 | a8083063 | Iustin Pop | |
57 | a8083063 | Iustin Pop | |
58 | a8083063 | Iustin Pop | class BaseHypervisor(object): |
59 | a8083063 | Iustin Pop | """Abstract virtualisation technology interface
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60 | a8083063 | Iustin Pop |
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61 | a8083063 | Iustin Pop | The goal is that all aspects of the virtualisation technology must
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62 | a8083063 | Iustin Pop | be abstracted away from the rest of code.
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63 | a8083063 | Iustin Pop |
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64 | a8083063 | Iustin Pop | """
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65 | a8083063 | Iustin Pop | def __init__(self): |
66 | a8083063 | Iustin Pop | pass
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67 | a8083063 | Iustin Pop | |
68 | a8083063 | Iustin Pop | def StartInstance(self, instance, block_devices, extra_args): |
69 | a8083063 | Iustin Pop | """Start an instance."""
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70 | a8083063 | Iustin Pop | raise NotImplementedError |
71 | a8083063 | Iustin Pop | |
72 | a8083063 | Iustin Pop | def StopInstance(self, instance, force=False): |
73 | a8083063 | Iustin Pop | """Stop an instance."""
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74 | a8083063 | Iustin Pop | raise NotImplementedError |
75 | a8083063 | Iustin Pop | |
76 | 7e1394dc | Alexander Schreiber | def RebootInstance(self, instance): |
77 | 7e1394dc | Alexander Schreiber | """Reboot an instance."""
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78 | 7e1394dc | Alexander Schreiber | raise NotImplementedError |
79 | 7e1394dc | Alexander Schreiber | |
80 | a8083063 | Iustin Pop | def ListInstances(self): |
81 | a8083063 | Iustin Pop | """Get the list of running instances."""
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82 | a8083063 | Iustin Pop | raise NotImplementedError |
83 | a8083063 | Iustin Pop | |
84 | a8083063 | Iustin Pop | def GetInstanceInfo(self, instance_name): |
85 | a8083063 | Iustin Pop | """Get instance properties.
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86 | a8083063 | Iustin Pop |
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87 | a8083063 | Iustin Pop | Args:
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88 | a8083063 | Iustin Pop | instance_name: the instance name
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89 | a8083063 | Iustin Pop |
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90 | a8083063 | Iustin Pop | Returns:
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91 | a8083063 | Iustin Pop | (name, id, memory, vcpus, state, times)
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92 | a8083063 | Iustin Pop |
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93 | a8083063 | Iustin Pop | """
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94 | a8083063 | Iustin Pop | raise NotImplementedError |
95 | a8083063 | Iustin Pop | |
96 | a8083063 | Iustin Pop | def GetAllInstancesInfo(self): |
97 | a8083063 | Iustin Pop | """Get properties of all instances.
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98 | a8083063 | Iustin Pop |
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99 | a8083063 | Iustin Pop | Returns:
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100 | a8083063 | Iustin Pop | [(name, id, memory, vcpus, stat, times),...]
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101 | a8083063 | Iustin Pop | """
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102 | a8083063 | Iustin Pop | raise NotImplementedError |
103 | a8083063 | Iustin Pop | |
104 | a8083063 | Iustin Pop | def GetNodeInfo(self): |
105 | a8083063 | Iustin Pop | """Return information about the node.
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106 | a8083063 | Iustin Pop |
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107 | a8083063 | Iustin Pop | The return value is a dict, which has to have the following items:
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108 | a8083063 | Iustin Pop | (all values in MiB)
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109 | a8083063 | Iustin Pop | - memory_total: the total memory size on the node
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110 | a8083063 | Iustin Pop | - memory_free: the available memory on the node for instances
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111 | a8083063 | Iustin Pop | - memory_dom0: the memory used by the node itself, if available
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112 | a8083063 | Iustin Pop |
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113 | a8083063 | Iustin Pop | """
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114 | a8083063 | Iustin Pop | raise NotImplementedError |
115 | a8083063 | Iustin Pop | |
116 | a8083063 | Iustin Pop | @staticmethod
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117 | a8083063 | Iustin Pop | def GetShellCommandForConsole(instance_name): |
118 | a8083063 | Iustin Pop | """Return a command for connecting to the console of an instance.
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119 | a8083063 | Iustin Pop |
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120 | a8083063 | Iustin Pop | """
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121 | a8083063 | Iustin Pop | raise NotImplementedError |
122 | a8083063 | Iustin Pop | |
123 | a8083063 | Iustin Pop | def Verify(self): |
124 | a8083063 | Iustin Pop | """Verify the hypervisor.
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125 | a8083063 | Iustin Pop |
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126 | a8083063 | Iustin Pop | """
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127 | a8083063 | Iustin Pop | raise NotImplementedError |
128 | a8083063 | Iustin Pop | |
129 | a8083063 | Iustin Pop | |
130 | a8083063 | Iustin Pop | class XenHypervisor(BaseHypervisor): |
131 | a8083063 | Iustin Pop | """Xen hypervisor interface"""
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132 | a8083063 | Iustin Pop | |
133 | a8083063 | Iustin Pop | @staticmethod
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134 | a8083063 | Iustin Pop | def _WriteConfigFile(instance, block_devices, extra_args): |
135 | a8083063 | Iustin Pop | """Create a Xen 3.0 config file.
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136 | a8083063 | Iustin Pop |
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137 | a8083063 | Iustin Pop | """
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138 | a8083063 | Iustin Pop | config = StringIO() |
139 | a8083063 | Iustin Pop | config.write("# this is autogenerated by Ganeti, please do not edit\n#\n")
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140 | f00b46bc | Michael Hanselmann | config.write("kernel = '%s'\n" % constants.XEN_KERNEL)
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141 | f00b46bc | Michael Hanselmann | if os.path.exists(constants.XEN_INITRD):
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142 | f00b46bc | Michael Hanselmann | config.write("ramdisk = '%s'\n" % constants.XEN_INITRD)
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143 | a8083063 | Iustin Pop | config.write("memory = %d\n" % instance.memory)
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144 | a8083063 | Iustin Pop | config.write("vcpus = %d\n" % instance.vcpus)
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145 | a8083063 | Iustin Pop | config.write("name = '%s'\n" % instance.name)
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146 | a8083063 | Iustin Pop | |
147 | a8083063 | Iustin Pop | vif_data = [] |
148 | a8083063 | Iustin Pop | for nic in instance.nics: |
149 | a8083063 | Iustin Pop | nic_str = "mac=%s, bridge=%s" % (nic.mac, nic.bridge)
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150 | a8083063 | Iustin Pop | ip = getattr(nic, "ip", None) |
151 | a8083063 | Iustin Pop | if ip is not None: |
152 | a8083063 | Iustin Pop | nic_str += ", ip=%s" % ip
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153 | a8083063 | Iustin Pop | vif_data.append("'%s'" % nic_str)
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154 | a8083063 | Iustin Pop | |
155 | a8083063 | Iustin Pop | config.write("vif = [%s]\n" % ",".join(vif_data)) |
156 | a8083063 | Iustin Pop | |
157 | a8083063 | Iustin Pop | disk_data = ["'phy:%s,%s,w'" % (rldev.dev_path, cfdev.iv_name)
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158 | a8083063 | Iustin Pop | for cfdev, rldev in block_devices] |
159 | a8083063 | Iustin Pop | config.write("disk = [%s]\n" % ",".join(disk_data)) |
160 | a8083063 | Iustin Pop | |
161 | a8083063 | Iustin Pop | config.write("root = '/dev/sda ro'\n")
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162 | a8083063 | Iustin Pop | config.write("on_poweroff = 'destroy'\n")
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163 | a8083063 | Iustin Pop | config.write("on_reboot = 'restart'\n")
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164 | a8083063 | Iustin Pop | config.write("on_crash = 'restart'\n")
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165 | a8083063 | Iustin Pop | if extra_args:
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166 | a8083063 | Iustin Pop | config.write("extra = '%s'\n" % extra_args)
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167 | a8083063 | Iustin Pop | # just in case it exists
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168 | a8083063 | Iustin Pop | utils.RemoveFile("/etc/xen/auto/%s" % instance.name)
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169 | a8083063 | Iustin Pop | f = open("/etc/xen/%s" % instance.name, "w") |
170 | a8083063 | Iustin Pop | f.write(config.getvalue()) |
171 | a8083063 | Iustin Pop | f.close() |
172 | a8083063 | Iustin Pop | return True |
173 | a8083063 | Iustin Pop | |
174 | a8083063 | Iustin Pop | @staticmethod
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175 | a8083063 | Iustin Pop | def _RemoveConfigFile(instance): |
176 | a8083063 | Iustin Pop | """Remove the xen configuration file.
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177 | a8083063 | Iustin Pop |
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178 | a8083063 | Iustin Pop | """
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179 | a8083063 | Iustin Pop | utils.RemoveFile("/etc/xen/%s" % instance.name)
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180 | a8083063 | Iustin Pop | |
181 | a8083063 | Iustin Pop | @staticmethod
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182 | a8083063 | Iustin Pop | def _GetXMList(include_node): |
183 | a8083063 | Iustin Pop | """Return the list of running instances.
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184 | a8083063 | Iustin Pop |
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185 | a8083063 | Iustin Pop | If the `include_node` argument is True, then we return information
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186 | a8083063 | Iustin Pop | for dom0 also, otherwise we filter that from the return value.
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187 | a8083063 | Iustin Pop |
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188 | a8083063 | Iustin Pop | The return value is a list of (name, id, memory, vcpus, state, time spent)
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189 | a8083063 | Iustin Pop |
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190 | a8083063 | Iustin Pop | """
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191 | a8083063 | Iustin Pop | for dummy in range(5): |
192 | a8083063 | Iustin Pop | result = utils.RunCmd(["xm", "list"]) |
193 | a8083063 | Iustin Pop | if not result.failed: |
194 | a8083063 | Iustin Pop | break
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195 | a8083063 | Iustin Pop | logger.Error("xm list failed (%s): %s" % (result.fail_reason,
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196 | a8083063 | Iustin Pop | result.output)) |
197 | a8083063 | Iustin Pop | time.sleep(1)
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198 | a8083063 | Iustin Pop | |
199 | a8083063 | Iustin Pop | if result.failed:
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200 | a8083063 | Iustin Pop | raise HypervisorError("xm list failed, retries exceeded (%s): %s" % |
201 | a8083063 | Iustin Pop | (result.fail_reason, result.stderr)) |
202 | a8083063 | Iustin Pop | |
203 | a8083063 | Iustin Pop | # skip over the heading and the domain 0 line (optional)
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204 | a8083063 | Iustin Pop | if include_node:
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205 | a8083063 | Iustin Pop | to_skip = 1
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206 | a8083063 | Iustin Pop | else:
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207 | a8083063 | Iustin Pop | to_skip = 2
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208 | a8083063 | Iustin Pop | lines = result.stdout.splitlines()[to_skip:] |
209 | a8083063 | Iustin Pop | result = [] |
210 | a8083063 | Iustin Pop | for line in lines: |
211 | a8083063 | Iustin Pop | # The format of lines is:
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212 | a8083063 | Iustin Pop | # Name ID Mem(MiB) VCPUs State Time(s)
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213 | a8083063 | Iustin Pop | # Domain-0 0 3418 4 r----- 266.2
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214 | a8083063 | Iustin Pop | data = line.split() |
215 | a8083063 | Iustin Pop | if len(data) != 6: |
216 | a8083063 | Iustin Pop | raise HypervisorError("Can't parse output of xm list, line: %s" % line) |
217 | a8083063 | Iustin Pop | try:
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218 | a8083063 | Iustin Pop | data[1] = int(data[1]) |
219 | a8083063 | Iustin Pop | data[2] = int(data[2]) |
220 | a8083063 | Iustin Pop | data[3] = int(data[3]) |
221 | a8083063 | Iustin Pop | data[5] = float(data[5]) |
222 | a8083063 | Iustin Pop | except ValueError, err: |
223 | a8083063 | Iustin Pop | raise HypervisorError("Can't parse output of xm list," |
224 | a8083063 | Iustin Pop | " line: %s, error: %s" % (line, err))
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225 | a8083063 | Iustin Pop | result.append(data) |
226 | a8083063 | Iustin Pop | return result
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227 | a8083063 | Iustin Pop | |
228 | a8083063 | Iustin Pop | def ListInstances(self): |
229 | a8083063 | Iustin Pop | """Get the list of running instances.
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230 | a8083063 | Iustin Pop |
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231 | a8083063 | Iustin Pop | """
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232 | a8083063 | Iustin Pop | xm_list = self._GetXMList(False) |
233 | a8083063 | Iustin Pop | names = [info[0] for info in xm_list] |
234 | a8083063 | Iustin Pop | return names
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235 | a8083063 | Iustin Pop | |
236 | a8083063 | Iustin Pop | def GetInstanceInfo(self, instance_name): |
237 | a8083063 | Iustin Pop | """Get instance properties.
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238 | a8083063 | Iustin Pop |
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239 | a8083063 | Iustin Pop | Args:
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240 | a8083063 | Iustin Pop | instance_name: the instance name
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241 | a8083063 | Iustin Pop |
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242 | a8083063 | Iustin Pop | Returns:
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243 | a8083063 | Iustin Pop | (name, id, memory, vcpus, stat, times)
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244 | a8083063 | Iustin Pop | """
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245 | a8083063 | Iustin Pop | xm_list = self._GetXMList(instance_name=="Domain-0") |
246 | a8083063 | Iustin Pop | result = None
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247 | a8083063 | Iustin Pop | for data in xm_list: |
248 | a8083063 | Iustin Pop | if data[0] == instance_name: |
249 | a8083063 | Iustin Pop | result = data |
250 | a8083063 | Iustin Pop | break
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251 | a8083063 | Iustin Pop | return result
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252 | a8083063 | Iustin Pop | |
253 | a8083063 | Iustin Pop | def GetAllInstancesInfo(self): |
254 | a8083063 | Iustin Pop | """Get properties of all instances.
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255 | a8083063 | Iustin Pop |
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256 | a8083063 | Iustin Pop | Returns:
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257 | a8083063 | Iustin Pop | [(name, id, memory, vcpus, stat, times),...]
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258 | a8083063 | Iustin Pop | """
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259 | a8083063 | Iustin Pop | xm_list = self._GetXMList(False) |
260 | a8083063 | Iustin Pop | return xm_list
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261 | a8083063 | Iustin Pop | |
262 | a8083063 | Iustin Pop | def StartInstance(self, instance, block_devices, extra_args): |
263 | a8083063 | Iustin Pop | """Start an instance."""
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264 | a8083063 | Iustin Pop | self._WriteConfigFile(instance, block_devices, extra_args)
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265 | a8083063 | Iustin Pop | result = utils.RunCmd(["xm", "create", instance.name]) |
266 | a8083063 | Iustin Pop | |
267 | a8083063 | Iustin Pop | if result.failed:
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268 | a8083063 | Iustin Pop | raise HypervisorError("Failed to start instance %s: %s" % |
269 | a8083063 | Iustin Pop | (instance.name, result.fail_reason)) |
270 | a8083063 | Iustin Pop | |
271 | a8083063 | Iustin Pop | def StopInstance(self, instance, force=False): |
272 | a8083063 | Iustin Pop | """Stop an instance."""
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273 | a8083063 | Iustin Pop | self._RemoveConfigFile(instance)
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274 | a8083063 | Iustin Pop | if force:
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275 | a8083063 | Iustin Pop | command = ["xm", "destroy", instance.name] |
276 | a8083063 | Iustin Pop | else:
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277 | a8083063 | Iustin Pop | command = ["xm", "shutdown", instance.name] |
278 | a8083063 | Iustin Pop | result = utils.RunCmd(command) |
279 | a8083063 | Iustin Pop | |
280 | a8083063 | Iustin Pop | if result.failed:
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281 | a8083063 | Iustin Pop | raise HypervisorError("Failed to stop instance %s: %s" % |
282 | a8083063 | Iustin Pop | (instance.name, result.fail_reason)) |
283 | a8083063 | Iustin Pop | |
284 | 7e1394dc | Alexander Schreiber | def RebootInstance(self, instance): |
285 | 7e1394dc | Alexander Schreiber | """Reboot an instance."""
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286 | 7e1394dc | Alexander Schreiber | result = utils.RunCmd(["xm", "reboot", instance.name]) |
287 | 7e1394dc | Alexander Schreiber | |
288 | 7e1394dc | Alexander Schreiber | if result.failed:
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289 | 7e1394dc | Alexander Schreiber | raise HypervisorError("Failed to reboot instance %s: %s" % |
290 | 7e1394dc | Alexander Schreiber | (instance.name, result.fail_reason)) |
291 | 7e1394dc | Alexander Schreiber | |
292 | a8083063 | Iustin Pop | def GetNodeInfo(self): |
293 | a8083063 | Iustin Pop | """Return information about the node.
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294 | a8083063 | Iustin Pop |
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295 | a8083063 | Iustin Pop | The return value is a dict, which has to have the following items:
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296 | a8083063 | Iustin Pop | (all values in MiB)
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297 | a8083063 | Iustin Pop | - memory_total: the total memory size on the node
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298 | a8083063 | Iustin Pop | - memory_free: the available memory on the node for instances
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299 | a8083063 | Iustin Pop | - memory_dom0: the memory used by the node itself, if available
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300 | a8083063 | Iustin Pop |
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301 | a8083063 | Iustin Pop | """
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302 | a8083063 | Iustin Pop | # note: in xen 3, memory has changed to total_memory
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303 | a8083063 | Iustin Pop | result = utils.RunCmd(["xm", "info"]) |
304 | a8083063 | Iustin Pop | if result.failed:
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305 | a8083063 | Iustin Pop | logger.Error("Can't run 'xm info': %s" % result.fail_reason)
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306 | a8083063 | Iustin Pop | return None |
307 | a8083063 | Iustin Pop | |
308 | a8083063 | Iustin Pop | xmoutput = result.stdout.splitlines() |
309 | a8083063 | Iustin Pop | result = {} |
310 | a8083063 | Iustin Pop | for line in xmoutput: |
311 | a8083063 | Iustin Pop | splitfields = line.split(":", 1) |
312 | a8083063 | Iustin Pop | |
313 | a8083063 | Iustin Pop | if len(splitfields) > 1: |
314 | a8083063 | Iustin Pop | key = splitfields[0].strip()
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315 | a8083063 | Iustin Pop | val = splitfields[1].strip()
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316 | a8083063 | Iustin Pop | if key == 'memory' or key == 'total_memory': |
317 | a8083063 | Iustin Pop | result['memory_total'] = int(val) |
318 | a8083063 | Iustin Pop | elif key == 'free_memory': |
319 | a8083063 | Iustin Pop | result['memory_free'] = int(val) |
320 | a8083063 | Iustin Pop | dom0_info = self.GetInstanceInfo("Domain-0") |
321 | a8083063 | Iustin Pop | if dom0_info is not None: |
322 | a8083063 | Iustin Pop | result['memory_dom0'] = dom0_info[2] |
323 | a8083063 | Iustin Pop | |
324 | a8083063 | Iustin Pop | return result
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325 | a8083063 | Iustin Pop | |
326 | a8083063 | Iustin Pop | @staticmethod
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327 | a8083063 | Iustin Pop | def GetShellCommandForConsole(instance_name): |
328 | a8083063 | Iustin Pop | """Return a command for connecting to the console of an instance.
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329 | a8083063 | Iustin Pop |
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330 | a8083063 | Iustin Pop | """
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331 | a8083063 | Iustin Pop | return "xm console %s" % instance_name |
332 | a8083063 | Iustin Pop | |
333 | a8083063 | Iustin Pop | |
334 | a8083063 | Iustin Pop | def Verify(self): |
335 | a8083063 | Iustin Pop | """Verify the hypervisor.
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336 | a8083063 | Iustin Pop |
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337 | a8083063 | Iustin Pop | For Xen, this verifies that the xend process is running.
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338 | a8083063 | Iustin Pop |
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339 | a8083063 | Iustin Pop | """
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340 | a8083063 | Iustin Pop | if not utils.CheckDaemonAlive('/var/run/xend.pid', 'xend'): |
341 | a8083063 | Iustin Pop | return "xend daemon is not running" |
342 | a8083063 | Iustin Pop | |
343 | a8083063 | Iustin Pop | |
344 | a8083063 | Iustin Pop | class FakeHypervisor(BaseHypervisor): |
345 | a8083063 | Iustin Pop | """Fake hypervisor interface.
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346 | a8083063 | Iustin Pop |
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347 | a8083063 | Iustin Pop | This can be used for testing the ganeti code without having to have
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348 | a8083063 | Iustin Pop | a real virtualisation software installed.
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349 | a8083063 | Iustin Pop |
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350 | a8083063 | Iustin Pop | """
|
351 | a8083063 | Iustin Pop | _ROOT_DIR = "/var/run/ganeti-fake-hypervisor"
|
352 | a8083063 | Iustin Pop | |
353 | a8083063 | Iustin Pop | def __init__(self): |
354 | a8083063 | Iustin Pop | BaseHypervisor.__init__(self)
|
355 | a8083063 | Iustin Pop | if not os.path.exists(self._ROOT_DIR): |
356 | a8083063 | Iustin Pop | os.mkdir(self._ROOT_DIR)
|
357 | a8083063 | Iustin Pop | |
358 | a8083063 | Iustin Pop | def ListInstances(self): |
359 | a8083063 | Iustin Pop | """Get the list of running instances.
|
360 | a8083063 | Iustin Pop |
|
361 | a8083063 | Iustin Pop | """
|
362 | a8083063 | Iustin Pop | return os.listdir(self._ROOT_DIR) |
363 | a8083063 | Iustin Pop | |
364 | a8083063 | Iustin Pop | def GetInstanceInfo(self, instance_name): |
365 | a8083063 | Iustin Pop | """Get instance properties.
|
366 | a8083063 | Iustin Pop |
|
367 | a8083063 | Iustin Pop | Args:
|
368 | a8083063 | Iustin Pop | instance_name: the instance name
|
369 | a8083063 | Iustin Pop |
|
370 | a8083063 | Iustin Pop | Returns:
|
371 | a8083063 | Iustin Pop | (name, id, memory, vcpus, stat, times)
|
372 | a8083063 | Iustin Pop | """
|
373 | a8083063 | Iustin Pop | file_name = "%s/%s" % (self._ROOT_DIR, instance_name) |
374 | a8083063 | Iustin Pop | if not os.path.exists(file_name): |
375 | a8083063 | Iustin Pop | return None |
376 | a8083063 | Iustin Pop | try:
|
377 | a8083063 | Iustin Pop | fh = file(file_name, "r") |
378 | a8083063 | Iustin Pop | try:
|
379 | a8083063 | Iustin Pop | inst_id = fh.readline().strip() |
380 | a8083063 | Iustin Pop | memory = fh.readline().strip() |
381 | a8083063 | Iustin Pop | vcpus = fh.readline().strip() |
382 | a8083063 | Iustin Pop | stat = "---b-"
|
383 | a8083063 | Iustin Pop | times = "0"
|
384 | a8083063 | Iustin Pop | return (instance_name, inst_id, memory, vcpus, stat, times)
|
385 | a8083063 | Iustin Pop | finally:
|
386 | a8083063 | Iustin Pop | fh.close() |
387 | a8083063 | Iustin Pop | except IOError, err: |
388 | a8083063 | Iustin Pop | raise HypervisorError("Failed to list instance %s: %s" % |
389 | a8083063 | Iustin Pop | (instance_name, err)) |
390 | a8083063 | Iustin Pop | |
391 | a8083063 | Iustin Pop | def GetAllInstancesInfo(self): |
392 | a8083063 | Iustin Pop | """Get properties of all instances.
|
393 | a8083063 | Iustin Pop |
|
394 | a8083063 | Iustin Pop | Returns:
|
395 | a8083063 | Iustin Pop | [(name, id, memory, vcpus, stat, times),...]
|
396 | a8083063 | Iustin Pop | """
|
397 | a8083063 | Iustin Pop | data = [] |
398 | a8083063 | Iustin Pop | for file_name in os.listdir(self._ROOT_DIR): |
399 | a8083063 | Iustin Pop | try:
|
400 | a8083063 | Iustin Pop | fh = file(self._ROOT_DIR+"/"+file_name, "r") |
401 | a8083063 | Iustin Pop | inst_id = "-1"
|
402 | a8083063 | Iustin Pop | memory = "0"
|
403 | a8083063 | Iustin Pop | stat = "-----"
|
404 | a8083063 | Iustin Pop | times = "-1"
|
405 | a8083063 | Iustin Pop | try:
|
406 | a8083063 | Iustin Pop | inst_id = fh.readline().strip() |
407 | a8083063 | Iustin Pop | memory = fh.readline().strip() |
408 | a8083063 | Iustin Pop | vcpus = fh.readline().strip() |
409 | a8083063 | Iustin Pop | stat = "---b-"
|
410 | a8083063 | Iustin Pop | times = "0"
|
411 | a8083063 | Iustin Pop | finally:
|
412 | a8083063 | Iustin Pop | fh.close() |
413 | a8083063 | Iustin Pop | data.append((file_name, inst_id, memory, vcpus, stat, times)) |
414 | a8083063 | Iustin Pop | except IOError, err: |
415 | a8083063 | Iustin Pop | raise HypervisorError("Failed to list instances: %s" % err) |
416 | a8083063 | Iustin Pop | return data
|
417 | a8083063 | Iustin Pop | |
418 | a8083063 | Iustin Pop | def StartInstance(self, instance, force, extra_args): |
419 | a8083063 | Iustin Pop | """Start an instance.
|
420 | a8083063 | Iustin Pop |
|
421 | a8083063 | Iustin Pop | For the fake hypervisor, it just creates a file in the base dir,
|
422 | a8083063 | Iustin Pop | creating an exception if it already exists. We don't actually
|
423 | a8083063 | Iustin Pop | handle race conditions properly, since these are *FAKE* instances.
|
424 | a8083063 | Iustin Pop |
|
425 | a8083063 | Iustin Pop | """
|
426 | a8083063 | Iustin Pop | file_name = self._ROOT_DIR + "/%s" % instance.name |
427 | a8083063 | Iustin Pop | if os.path.exists(file_name):
|
428 | a8083063 | Iustin Pop | raise HypervisorError("Failed to start instance %s: %s" % |
429 | a8083063 | Iustin Pop | (instance.name, "already running"))
|
430 | a8083063 | Iustin Pop | try:
|
431 | a8083063 | Iustin Pop | fh = file(file_name, "w") |
432 | a8083063 | Iustin Pop | try:
|
433 | a8083063 | Iustin Pop | fh.write("0\n%d\n%d\n" % (instance.memory, instance.vcpus))
|
434 | a8083063 | Iustin Pop | finally:
|
435 | a8083063 | Iustin Pop | fh.close() |
436 | a8083063 | Iustin Pop | except IOError, err: |
437 | a8083063 | Iustin Pop | raise HypervisorError("Failed to start instance %s: %s" % |
438 | a8083063 | Iustin Pop | (instance.name, err)) |
439 | a8083063 | Iustin Pop | |
440 | a8083063 | Iustin Pop | def StopInstance(self, instance, force=False): |
441 | a8083063 | Iustin Pop | """Stop an instance.
|
442 | a8083063 | Iustin Pop |
|
443 | a8083063 | Iustin Pop | For the fake hypervisor, this just removes the file in the base
|
444 | a8083063 | Iustin Pop | dir, if it exist, otherwise we raise an exception.
|
445 | a8083063 | Iustin Pop |
|
446 | a8083063 | Iustin Pop | """
|
447 | a8083063 | Iustin Pop | file_name = self._ROOT_DIR + "/%s" % instance.name |
448 | a8083063 | Iustin Pop | if not os.path.exists(file_name): |
449 | a8083063 | Iustin Pop | raise HypervisorError("Failed to stop instance %s: %s" % |
450 | a8083063 | Iustin Pop | (instance.name, "not running"))
|
451 | a8083063 | Iustin Pop | utils.RemoveFile(file_name) |
452 | a8083063 | Iustin Pop | |
453 | 7e1394dc | Alexander Schreiber | def RebootInstance(self, instance): |
454 | 7e1394dc | Alexander Schreiber | """Reboot an instance.
|
455 | 7e1394dc | Alexander Schreiber |
|
456 | 7e1394dc | Alexander Schreiber | For the fake hypervisor, this does nothing.
|
457 | 7e1394dc | Alexander Schreiber |
|
458 | 7e1394dc | Alexander Schreiber | """
|
459 | 7e1394dc | Alexander Schreiber | return
|
460 | 7e1394dc | Alexander Schreiber | |
461 | a8083063 | Iustin Pop | def GetNodeInfo(self): |
462 | a8083063 | Iustin Pop | """Return information about the node.
|
463 | a8083063 | Iustin Pop |
|
464 | a8083063 | Iustin Pop | The return value is a dict, which has to have the following items:
|
465 | a8083063 | Iustin Pop | (all values in MiB)
|
466 | a8083063 | Iustin Pop | - memory_total: the total memory size on the node
|
467 | a8083063 | Iustin Pop | - memory_free: the available memory on the node for instances
|
468 | a8083063 | Iustin Pop | - memory_dom0: the memory used by the node itself, if available
|
469 | a8083063 | Iustin Pop |
|
470 | a8083063 | Iustin Pop | """
|
471 | a8083063 | Iustin Pop | # global ram usage from the xm info command
|
472 | a8083063 | Iustin Pop | # memory : 3583
|
473 | a8083063 | Iustin Pop | # free_memory : 747
|
474 | a8083063 | Iustin Pop | # note: in xen 3, memory has changed to total_memory
|
475 | a8083063 | Iustin Pop | try:
|
476 | a8083063 | Iustin Pop | fh = file("/proc/meminfo") |
477 | a8083063 | Iustin Pop | try:
|
478 | a8083063 | Iustin Pop | data = fh.readlines() |
479 | a8083063 | Iustin Pop | finally:
|
480 | a8083063 | Iustin Pop | fh.close() |
481 | a8083063 | Iustin Pop | except IOError, err: |
482 | a8083063 | Iustin Pop | raise HypervisorError("Failed to list node info: %s" % err) |
483 | a8083063 | Iustin Pop | |
484 | a8083063 | Iustin Pop | result = {} |
485 | a8083063 | Iustin Pop | sum_free = 0
|
486 | a8083063 | Iustin Pop | for line in data: |
487 | a8083063 | Iustin Pop | splitfields = line.split(":", 1) |
488 | a8083063 | Iustin Pop | |
489 | a8083063 | Iustin Pop | if len(splitfields) > 1: |
490 | a8083063 | Iustin Pop | key = splitfields[0].strip()
|
491 | a8083063 | Iustin Pop | val = splitfields[1].strip()
|
492 | a8083063 | Iustin Pop | if key == 'MemTotal': |
493 | a8083063 | Iustin Pop | result['memory_total'] = int(val.split()[0])/1024 |
494 | a8083063 | Iustin Pop | elif key in ('MemFree', 'Buffers', 'Cached'): |
495 | a8083063 | Iustin Pop | sum_free += int(val.split()[0])/1024 |
496 | a8083063 | Iustin Pop | elif key == 'Active': |
497 | a8083063 | Iustin Pop | result['memory_dom0'] = int(val.split()[0])/1024 |
498 | a8083063 | Iustin Pop | |
499 | a8083063 | Iustin Pop | result['memory_free'] = sum_free
|
500 | a8083063 | Iustin Pop | return result
|
501 | a8083063 | Iustin Pop | |
502 | a8083063 | Iustin Pop | @staticmethod
|
503 | a8083063 | Iustin Pop | def GetShellCommandForConsole(instance_name): |
504 | a8083063 | Iustin Pop | """Return a command for connecting to the console of an instance.
|
505 | a8083063 | Iustin Pop |
|
506 | a8083063 | Iustin Pop | """
|
507 | a8083063 | Iustin Pop | return "echo Console not available for fake hypervisor" |
508 | a8083063 | Iustin Pop | |
509 | a8083063 | Iustin Pop | def Verify(self): |
510 | a8083063 | Iustin Pop | """Verify the hypervisor.
|
511 | a8083063 | Iustin Pop |
|
512 | a8083063 | Iustin Pop | For the fake hypervisor, it just checks the existence of the base
|
513 | a8083063 | Iustin Pop | dir.
|
514 | a8083063 | Iustin Pop |
|
515 | a8083063 | Iustin Pop | """
|
516 | a8083063 | Iustin Pop | if not os.path.exists(self._ROOT_DIR): |
517 | a8083063 | Iustin Pop | return "The required directory '%s' does not exist." % self._ROOT_DIR |