root / lib / hypervisor / hv_chroot.py @ 9b94905f
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2 | 48297fa2 | Iustin Pop | #
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3 | 48297fa2 | Iustin Pop | |
4 | 48297fa2 | Iustin Pop | # Copyright (C) 2006, 2007, 2008, 2009 Google Inc.
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5 | 48297fa2 | Iustin Pop | #
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6 | 48297fa2 | Iustin Pop | # This program is free software; you can redistribute it and/or modify
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7 | 48297fa2 | Iustin Pop | # it under the terms of the GNU General Public License as published by
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8 | 48297fa2 | Iustin Pop | # the Free Software Foundation; either version 2 of the License, or
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9 | 48297fa2 | Iustin Pop | # (at your option) any later version.
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10 | 48297fa2 | Iustin Pop | #
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11 | 48297fa2 | Iustin Pop | # This program is distributed in the hope that it will be useful, but
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12 | 48297fa2 | Iustin Pop | # WITHOUT ANY WARRANTY; without even the implied warranty of
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13 | 48297fa2 | Iustin Pop | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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14 | 48297fa2 | Iustin Pop | # General Public License for more details.
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15 | 48297fa2 | Iustin Pop | #
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16 | 48297fa2 | Iustin Pop | # You should have received a copy of the GNU General Public License
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17 | 48297fa2 | Iustin Pop | # along with this program; if not, write to the Free Software
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18 | 48297fa2 | Iustin Pop | # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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19 | 48297fa2 | Iustin Pop | # 02110-1301, USA.
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20 | 48297fa2 | Iustin Pop | |
21 | 48297fa2 | Iustin Pop | |
22 | 48297fa2 | Iustin Pop | """Chroot manager hypervisor
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23 | 48297fa2 | Iustin Pop |
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24 | 48297fa2 | Iustin Pop | """
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25 | 48297fa2 | Iustin Pop | |
26 | 48297fa2 | Iustin Pop | import os |
27 | 48297fa2 | Iustin Pop | import os.path |
28 | 48297fa2 | Iustin Pop | import time |
29 | 48297fa2 | Iustin Pop | import logging |
30 | 48297fa2 | Iustin Pop | from cStringIO import StringIO |
31 | 48297fa2 | Iustin Pop | |
32 | 48297fa2 | Iustin Pop | from ganeti import constants |
33 | 48297fa2 | Iustin Pop | from ganeti import errors |
34 | 48297fa2 | Iustin Pop | from ganeti import utils |
35 | 48297fa2 | Iustin Pop | from ganeti.hypervisor import hv_base |
36 | 48297fa2 | Iustin Pop | from ganeti.errors import HypervisorError |
37 | 48297fa2 | Iustin Pop | |
38 | 48297fa2 | Iustin Pop | |
39 | 48297fa2 | Iustin Pop | class ChrootManager(hv_base.BaseHypervisor): |
40 | 48297fa2 | Iustin Pop | """Chroot manager.
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41 | 48297fa2 | Iustin Pop |
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42 | 48297fa2 | Iustin Pop | This not-really hypervisor allows ganeti to manage chroots. It has
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43 | 48297fa2 | Iustin Pop | special behaviour and requirements on the OS definition and the node
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44 | 48297fa2 | Iustin Pop | environemnt:
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45 | 48297fa2 | Iustin Pop | - the start and stop of the chroot environment are done via a
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46 | 48297fa2 | Iustin Pop | script called ganeti-chroot located in the root directory of the
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47 | 48297fa2 | Iustin Pop | first drive, which should be created by the OS definition
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48 | 48297fa2 | Iustin Pop | - this script must accept the start and stop argument and, on
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49 | 48297fa2 | Iustin Pop | shutdown, it should cleanly shutdown the daemons/processes
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50 | 48297fa2 | Iustin Pop | using the chroot
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51 | 48297fa2 | Iustin Pop | - the daemons run in chroot should only bind to the instance IP
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52 | 48297fa2 | Iustin Pop | (to which the OS create script has access via the instance name)
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53 | 48297fa2 | Iustin Pop | - since some daemons in the node could be listening on the wildcard
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54 | 48297fa2 | Iustin Pop | address, some ports might be unavailable
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55 | 48297fa2 | Iustin Pop | - the instance listing will show no memory usage
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56 | 48297fa2 | Iustin Pop | - on shutdown, the chroot manager will try to find all mountpoints
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57 | 48297fa2 | Iustin Pop | under the root dir of the instance and unmount them
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58 | 48297fa2 | Iustin Pop | - instance alive check is based on whether any process is using the chroot
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59 | 48297fa2 | Iustin Pop |
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60 | 48297fa2 | Iustin Pop | """
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61 | 48297fa2 | Iustin Pop | _ROOT_DIR = constants.RUN_GANETI_DIR + "/chroot-hypervisor"
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62 | 48297fa2 | Iustin Pop | |
63 | 46952329 | Guido Trotter | PARAMETERS = { |
64 | 46952329 | Guido Trotter | constants.HV_INIT_SCRIPT: (True, utils.IsNormAbsPath,
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65 | 46952329 | Guido Trotter | "must be an absolute normalized path",
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66 | d73ef63f | Michael Hanselmann | None, None), |
67 | 46952329 | Guido Trotter | } |
68 | 48297fa2 | Iustin Pop | |
69 | 48297fa2 | Iustin Pop | def __init__(self): |
70 | 48297fa2 | Iustin Pop | hv_base.BaseHypervisor.__init__(self)
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71 | 48297fa2 | Iustin Pop | if not os.path.exists(self._ROOT_DIR): |
72 | 48297fa2 | Iustin Pop | os.mkdir(self._ROOT_DIR)
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73 | 48297fa2 | Iustin Pop | if not os.path.isdir(self._ROOT_DIR): |
74 | 48297fa2 | Iustin Pop | raise HypervisorError("Needed path %s is not a directory" % |
75 | 48297fa2 | Iustin Pop | self._ROOT_DIR)
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76 | 48297fa2 | Iustin Pop | |
77 | 48297fa2 | Iustin Pop | @staticmethod
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78 | 48297fa2 | Iustin Pop | def _IsDirLive(path): |
79 | 48297fa2 | Iustin Pop | """Check if a directory looks like a live chroot.
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80 | 48297fa2 | Iustin Pop |
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81 | 48297fa2 | Iustin Pop | """
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82 | 48297fa2 | Iustin Pop | if not os.path.ismount(path): |
83 | 48297fa2 | Iustin Pop | return False |
84 | 48297fa2 | Iustin Pop | result = utils.RunCmd(["fuser", "-m", path]) |
85 | 48297fa2 | Iustin Pop | return not result.failed |
86 | 48297fa2 | Iustin Pop | |
87 | 48297fa2 | Iustin Pop | @staticmethod
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88 | 48297fa2 | Iustin Pop | def _GetMountSubdirs(path): |
89 | 48297fa2 | Iustin Pop | """Return the list of mountpoints under a given path.
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90 | 48297fa2 | Iustin Pop |
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91 | 48297fa2 | Iustin Pop | This function is Linux-specific.
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92 | 48297fa2 | Iustin Pop |
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93 | 48297fa2 | Iustin Pop | """
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94 | 48297fa2 | Iustin Pop | #TODO(iustin): investigate and document non-linux options
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95 | 48297fa2 | Iustin Pop | #(e.g. via mount output)
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96 | 48297fa2 | Iustin Pop | data = [] |
97 | 48297fa2 | Iustin Pop | fh = open("/proc/mounts", "r") |
98 | 48297fa2 | Iustin Pop | try:
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99 | 48297fa2 | Iustin Pop | for line in fh: |
100 | 48297fa2 | Iustin Pop | fstype, mountpoint, rest = line.split(" ", 2) |
101 | 48297fa2 | Iustin Pop | if (mountpoint.startswith(path) and |
102 | 48297fa2 | Iustin Pop | mountpoint != path): |
103 | 48297fa2 | Iustin Pop | data.append(mountpoint) |
104 | 48297fa2 | Iustin Pop | finally:
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105 | 48297fa2 | Iustin Pop | fh.close() |
106 | 48297fa2 | Iustin Pop | data.sort(key=lambda x: x.count("/"), reverse=True) |
107 | 48297fa2 | Iustin Pop | return data
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108 | 48297fa2 | Iustin Pop | |
109 | 48297fa2 | Iustin Pop | def ListInstances(self): |
110 | 48297fa2 | Iustin Pop | """Get the list of running instances.
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111 | 48297fa2 | Iustin Pop |
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112 | 48297fa2 | Iustin Pop | """
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113 | 48297fa2 | Iustin Pop | return [name for name in os.listdir(self._ROOT_DIR) |
114 | 48297fa2 | Iustin Pop | if self._IsDirLive(os.path.join(self._ROOT_DIR, name))] |
115 | 48297fa2 | Iustin Pop | |
116 | 48297fa2 | Iustin Pop | def GetInstanceInfo(self, instance_name): |
117 | 48297fa2 | Iustin Pop | """Get instance properties.
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118 | 48297fa2 | Iustin Pop |
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119 | d73ef63f | Michael Hanselmann | @type instance_name: string
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120 | d73ef63f | Michael Hanselmann | @param instance_name: the instance name
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121 | d73ef63f | Michael Hanselmann |
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122 | d73ef63f | Michael Hanselmann | @return: (name, id, memory, vcpus, stat, times)
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123 | 48297fa2 | Iustin Pop |
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124 | 48297fa2 | Iustin Pop | """
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125 | 48297fa2 | Iustin Pop | dir_name = "%s/%s" % (self._ROOT_DIR, instance_name) |
126 | 48297fa2 | Iustin Pop | if not self._IsDirLive(dir_name): |
127 | 48297fa2 | Iustin Pop | raise HypervisorError("Instance %s is not running" % instance_name) |
128 | 48297fa2 | Iustin Pop | return (instance_name, 0, 0, 0, 0, 0) |
129 | 48297fa2 | Iustin Pop | |
130 | 48297fa2 | Iustin Pop | def GetAllInstancesInfo(self): |
131 | 48297fa2 | Iustin Pop | """Get properties of all instances.
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132 | 48297fa2 | Iustin Pop |
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133 | d73ef63f | Michael Hanselmann | @return: [(name, id, memory, vcpus, stat, times),...]
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134 | d73ef63f | Michael Hanselmann |
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135 | 48297fa2 | Iustin Pop | """
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136 | 48297fa2 | Iustin Pop | data = [] |
137 | 48297fa2 | Iustin Pop | for file_name in os.listdir(self._ROOT_DIR): |
138 | 48297fa2 | Iustin Pop | path = os.path.join(self._ROOT_DIR, file_name)
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139 | 48297fa2 | Iustin Pop | if self._IsDirLive(path): |
140 | 48297fa2 | Iustin Pop | data.append((file_name, 0, 0, 0, 0, 0)) |
141 | 48297fa2 | Iustin Pop | return data
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142 | 48297fa2 | Iustin Pop | |
143 | 48297fa2 | Iustin Pop | def StartInstance(self, instance, block_devices): |
144 | 48297fa2 | Iustin Pop | """Start an instance.
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145 | 48297fa2 | Iustin Pop |
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146 | 48297fa2 | Iustin Pop | For the chroot manager, we try to mount the block device and
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147 | 48297fa2 | Iustin Pop | execute '/ganeti-chroot start'.
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148 | 48297fa2 | Iustin Pop |
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149 | 48297fa2 | Iustin Pop | """
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150 | 48297fa2 | Iustin Pop | root_dir = "%s/%s" % (self._ROOT_DIR, instance.name) |
151 | 48297fa2 | Iustin Pop | if not os.path.exists(root_dir): |
152 | 48297fa2 | Iustin Pop | try:
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153 | 48297fa2 | Iustin Pop | os.mkdir(root_dir) |
154 | 48297fa2 | Iustin Pop | except IOError, err: |
155 | 48297fa2 | Iustin Pop | raise HypervisorError("Failed to start instance %s: %s" % |
156 | 48297fa2 | Iustin Pop | (instance.name, err)) |
157 | 48297fa2 | Iustin Pop | if not os.path.isdir(root_dir): |
158 | 48297fa2 | Iustin Pop | raise HypervisorError("Needed path %s is not a directory" % root_dir) |
159 | 48297fa2 | Iustin Pop | |
160 | 48297fa2 | Iustin Pop | if not os.path.ismount(root_dir): |
161 | 48297fa2 | Iustin Pop | if not block_devices: |
162 | 48297fa2 | Iustin Pop | raise HypervisorError("The chroot manager needs at least one disk") |
163 | 48297fa2 | Iustin Pop | |
164 | 48297fa2 | Iustin Pop | sda_dev_path = block_devices[0][1] |
165 | 48297fa2 | Iustin Pop | result = utils.RunCmd(["mount", sda_dev_path, root_dir])
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166 | 48297fa2 | Iustin Pop | if result.failed:
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167 | 48297fa2 | Iustin Pop | raise HypervisorError("Can't mount the chroot dir: %s" % result.output) |
168 | 48297fa2 | Iustin Pop | init_script = instance.hvparams[constants.HV_INIT_SCRIPT] |
169 | 48297fa2 | Iustin Pop | result = utils.RunCmd(["chroot", root_dir, init_script, "start"]) |
170 | 48297fa2 | Iustin Pop | if result.failed:
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171 | 48297fa2 | Iustin Pop | raise HypervisorError("Can't run the chroot start script: %s" % |
172 | 48297fa2 | Iustin Pop | result.output) |
173 | 48297fa2 | Iustin Pop | |
174 | 07b49e41 | Guido Trotter | def StopInstance(self, instance, force=False, retry=False): |
175 | 48297fa2 | Iustin Pop | """Stop an instance.
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176 | 48297fa2 | Iustin Pop |
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177 | 48297fa2 | Iustin Pop | This method has complicated cleanup tests, as we must:
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178 | 48297fa2 | Iustin Pop | - try to kill all leftover processes
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179 | 48297fa2 | Iustin Pop | - try to unmount any additional sub-mountpoints
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180 | 48297fa2 | Iustin Pop | - finally unmount the instance dir
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181 | 48297fa2 | Iustin Pop |
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182 | 48297fa2 | Iustin Pop | """
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183 | 48297fa2 | Iustin Pop | root_dir = "%s/%s" % (self._ROOT_DIR, instance.name) |
184 | a2771c83 | Guido Trotter | if not os.path.exists(root_dir) or not self._IsDirLive(root_dir): |
185 | 48297fa2 | Iustin Pop | return
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186 | 48297fa2 | Iustin Pop | |
187 | a2771c83 | Guido Trotter | # Run the chroot stop script only once
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188 | a2771c83 | Guido Trotter | if not retry and not force: |
189 | 48297fa2 | Iustin Pop | result = utils.RunCmd(["chroot", root_dir, "/ganeti-chroot", "stop"]) |
190 | 48297fa2 | Iustin Pop | if result.failed:
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191 | 48297fa2 | Iustin Pop | raise HypervisorError("Can't run the chroot stop script: %s" % |
192 | 48297fa2 | Iustin Pop | result.output) |
193 | a2771c83 | Guido Trotter | |
194 | a2771c83 | Guido Trotter | if not force: |
195 | a2771c83 | Guido Trotter | utils.RunCmd(["fuser", "-k", "-TERM", "-m", root_dir]) |
196 | a2771c83 | Guido Trotter | else:
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197 | a2771c83 | Guido Trotter | utils.RunCmd(["fuser", "-k", "-KILL", "-m", root_dir]) |
198 | a2771c83 | Guido Trotter | # 2 seconds at most should be enough for KILL to take action
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199 | a2771c83 | Guido Trotter | time.sleep(2)
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200 | a2771c83 | Guido Trotter | |
201 | a2771c83 | Guido Trotter | if self._IsDirLive(root_dir): |
202 | a2771c83 | Guido Trotter | if force:
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203 | 48297fa2 | Iustin Pop | raise HypervisorError("Can't stop the processes using the chroot") |
204 | a2771c83 | Guido Trotter | return
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205 | a2771c83 | Guido Trotter | |
206 | 48297fa2 | Iustin Pop | for mpath in self._GetMountSubdirs(root_dir): |
207 | 48297fa2 | Iustin Pop | utils.RunCmd(["umount", mpath])
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208 | a2771c83 | Guido Trotter | |
209 | a2771c83 | Guido Trotter | result = utils.RunCmd(["umount", root_dir])
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210 | a2771c83 | Guido Trotter | if result.failed and force: |
211 | a2771c83 | Guido Trotter | msg = ("Processes still alive in the chroot: %s" %
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212 | a2771c83 | Guido Trotter | utils.RunCmd("fuser -vm %s" % root_dir).output)
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213 | a2771c83 | Guido Trotter | logging.error(msg) |
214 | a2771c83 | Guido Trotter | raise HypervisorError("Can't umount the chroot dir: %s (%s)" % |
215 | a2771c83 | Guido Trotter | (result.output, msg)) |
216 | 48297fa2 | Iustin Pop | |
217 | 48297fa2 | Iustin Pop | def RebootInstance(self, instance): |
218 | 48297fa2 | Iustin Pop | """Reboot an instance.
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219 | 48297fa2 | Iustin Pop |
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220 | 48297fa2 | Iustin Pop | This is not (yet) implemented for the chroot manager.
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221 | 48297fa2 | Iustin Pop |
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222 | 48297fa2 | Iustin Pop | """
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223 | 48297fa2 | Iustin Pop | raise HypervisorError("The chroot manager doesn't implement the" |
224 | 48297fa2 | Iustin Pop | " reboot functionality")
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225 | 48297fa2 | Iustin Pop | |
226 | 48297fa2 | Iustin Pop | def GetNodeInfo(self): |
227 | 48297fa2 | Iustin Pop | """Return information about the node.
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228 | 48297fa2 | Iustin Pop |
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229 | 48297fa2 | Iustin Pop | This is just a wrapper over the base GetLinuxNodeInfo method.
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230 | 48297fa2 | Iustin Pop |
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231 | 48297fa2 | Iustin Pop | @return: a dict with the following keys (values in MiB):
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232 | 48297fa2 | Iustin Pop | - memory_total: the total memory size on the node
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233 | 48297fa2 | Iustin Pop | - memory_free: the available memory on the node for instances
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234 | 48297fa2 | Iustin Pop | - memory_dom0: the memory used by the node itself, if available
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235 | 48297fa2 | Iustin Pop |
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236 | 48297fa2 | Iustin Pop | """
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237 | 48297fa2 | Iustin Pop | return self.GetLinuxNodeInfo() |
238 | 48297fa2 | Iustin Pop | |
239 | 48297fa2 | Iustin Pop | @classmethod
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240 | 48297fa2 | Iustin Pop | def GetShellCommandForConsole(cls, instance, hvparams, beparams): |
241 | 48297fa2 | Iustin Pop | """Return a command for connecting to the console of an instance.
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242 | 48297fa2 | Iustin Pop |
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243 | 48297fa2 | Iustin Pop | """
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244 | 48297fa2 | Iustin Pop | root_dir = "%s/%s" % (cls._ROOT_DIR, instance.name)
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245 | 48297fa2 | Iustin Pop | if not os.path.ismount(root_dir): |
246 | 48297fa2 | Iustin Pop | raise HypervisorError("Instance %s is not running" % instance.name) |
247 | 48297fa2 | Iustin Pop | |
248 | 48297fa2 | Iustin Pop | return "chroot %s" % root_dir |
249 | 48297fa2 | Iustin Pop | |
250 | 48297fa2 | Iustin Pop | def Verify(self): |
251 | 48297fa2 | Iustin Pop | """Verify the hypervisor.
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252 | 48297fa2 | Iustin Pop |
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253 | d73ef63f | Michael Hanselmann | For the chroot manager, it just checks the existence of the base dir.
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254 | 48297fa2 | Iustin Pop |
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255 | 48297fa2 | Iustin Pop | """
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256 | 48297fa2 | Iustin Pop | if not os.path.exists(self._ROOT_DIR): |
257 | 48297fa2 | Iustin Pop | return "The required directory '%s' does not exist." % self._ROOT_DIR |