root / htools / Ganeti / HTools / Instance.hs @ a10a476a
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1 | e4f08c46 | Iustin Pop | {-| Module describing an instance. |
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2 | e4f08c46 | Iustin Pop | |
3 | e4f08c46 | Iustin Pop | The instance data type holds very few fields, the algorithm |
4 | e4f08c46 | Iustin Pop | intelligence is in the "Node" and "Cluster" modules. |
5 | e4f08c46 | Iustin Pop | |
6 | e4f08c46 | Iustin Pop | -} |
7 | e2fa2baf | Iustin Pop | |
8 | e2fa2baf | Iustin Pop | {- |
9 | e2fa2baf | Iustin Pop | |
10 | c352b0a9 | Iustin Pop | Copyright (C) 2009, 2010, 2011 Google Inc. |
11 | e2fa2baf | Iustin Pop | |
12 | e2fa2baf | Iustin Pop | This program is free software; you can redistribute it and/or modify |
13 | e2fa2baf | Iustin Pop | it under the terms of the GNU General Public License as published by |
14 | e2fa2baf | Iustin Pop | the Free Software Foundation; either version 2 of the License, or |
15 | e2fa2baf | Iustin Pop | (at your option) any later version. |
16 | e2fa2baf | Iustin Pop | |
17 | e2fa2baf | Iustin Pop | This program is distributed in the hope that it will be useful, but |
18 | e2fa2baf | Iustin Pop | WITHOUT ANY WARRANTY; without even the implied warranty of |
19 | e2fa2baf | Iustin Pop | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
20 | e2fa2baf | Iustin Pop | General Public License for more details. |
21 | e2fa2baf | Iustin Pop | |
22 | e2fa2baf | Iustin Pop | You should have received a copy of the GNU General Public License |
23 | e2fa2baf | Iustin Pop | along with this program; if not, write to the Free Software |
24 | e2fa2baf | Iustin Pop | Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
25 | e2fa2baf | Iustin Pop | 02110-1301, USA. |
26 | e2fa2baf | Iustin Pop | |
27 | e2fa2baf | Iustin Pop | -} |
28 | e2fa2baf | Iustin Pop | |
29 | 181d4e04 | Iustin Pop | module Ganeti.HTools.Instance |
30 | 181d4e04 | Iustin Pop | ( Instance(..) |
31 | 181d4e04 | Iustin Pop | , AssocList |
32 | 181d4e04 | Iustin Pop | , List |
33 | 181d4e04 | Iustin Pop | , create |
34 | 181d4e04 | Iustin Pop | , setIdx |
35 | 181d4e04 | Iustin Pop | , setName |
36 | 8bcdde0c | Iustin Pop | , setAlias |
37 | 181d4e04 | Iustin Pop | , setPri |
38 | 181d4e04 | Iustin Pop | , setSec |
39 | 181d4e04 | Iustin Pop | , setBoth |
40 | a182df55 | Iustin Pop | , setMovable |
41 | 83ad1f3c | Iustin Pop | , specOf |
42 | c8db97e5 | Iustin Pop | , shrinkByType |
43 | a46f34d7 | Iustin Pop | , runningStates |
44 | a10a476a | Iustin Pop | , requiredNodes |
45 | 181d4e04 | Iustin Pop | ) where |
46 | e4f08c46 | Iustin Pop | |
47 | 262a08a2 | Iustin Pop | import qualified Ganeti.HTools.Types as T |
48 | 262a08a2 | Iustin Pop | import qualified Ganeti.HTools.Container as Container |
49 | e82271f8 | Iustin Pop | import qualified Ganeti.Constants as C |
50 | 262a08a2 | Iustin Pop | |
51 | 9188aeef | Iustin Pop | -- * Type declarations |
52 | 9188aeef | Iustin Pop | |
53 | 525bfb36 | Iustin Pop | -- | The instance type. |
54 | c352b0a9 | Iustin Pop | data Instance = Instance |
55 | c352b0a9 | Iustin Pop | { name :: String -- ^ The instance name |
56 | c352b0a9 | Iustin Pop | , alias :: String -- ^ The shortened name |
57 | c352b0a9 | Iustin Pop | , mem :: Int -- ^ Memory of the instance |
58 | c352b0a9 | Iustin Pop | , dsk :: Int -- ^ Disk size of instance |
59 | c352b0a9 | Iustin Pop | , vcpus :: Int -- ^ Number of VCPUs |
60 | c352b0a9 | Iustin Pop | , running :: Bool -- ^ Is the instance running? |
61 | c352b0a9 | Iustin Pop | , runSt :: String -- ^ Original (text) run status |
62 | c352b0a9 | Iustin Pop | , pNode :: T.Ndx -- ^ Original primary node |
63 | c352b0a9 | Iustin Pop | , sNode :: T.Ndx -- ^ Original secondary node |
64 | c352b0a9 | Iustin Pop | , idx :: T.Idx -- ^ Internal index |
65 | c352b0a9 | Iustin Pop | , util :: T.DynUtil -- ^ Dynamic resource usage |
66 | c352b0a9 | Iustin Pop | , movable :: Bool -- ^ Can the instance be moved? |
67 | 0e09422b | Iustin Pop | , autoBalance :: Bool -- ^ Is the instance auto-balanced? |
68 | c352b0a9 | Iustin Pop | , tags :: [String] -- ^ List of instance tags |
69 | d25643d1 | Iustin Pop | , diskTemplate :: T.DiskTemplate -- ^ The disk template of the instance |
70 | c352b0a9 | Iustin Pop | } deriving (Show, Read) |
71 | e4f08c46 | Iustin Pop | |
72 | 262a08a2 | Iustin Pop | instance T.Element Instance where |
73 | 3e4480e0 | Iustin Pop | nameOf = name |
74 | 3e4480e0 | Iustin Pop | idxOf = idx |
75 | 3e4480e0 | Iustin Pop | setAlias = setAlias |
76 | 3e4480e0 | Iustin Pop | setIdx = setIdx |
77 | c854092b | Iustin Pop | allNames n = [name n, alias n] |
78 | 262a08a2 | Iustin Pop | |
79 | 525bfb36 | Iustin Pop | -- | Constant holding the running instance states. |
80 | a46f34d7 | Iustin Pop | runningStates :: [String] |
81 | e82271f8 | Iustin Pop | runningStates = [C.inststRunning, C.inststErrorup] |
82 | a46f34d7 | Iustin Pop | |
83 | 9188aeef | Iustin Pop | -- | A simple name for the int, instance association list. |
84 | 608efcce | Iustin Pop | type AssocList = [(T.Idx, Instance)] |
85 | 040afc35 | Iustin Pop | |
86 | 9188aeef | Iustin Pop | -- | A simple name for an instance map. |
87 | 262a08a2 | Iustin Pop | type List = Container.Container Instance |
88 | 262a08a2 | Iustin Pop | |
89 | 9188aeef | Iustin Pop | -- * Initialization |
90 | 9188aeef | Iustin Pop | |
91 | 9188aeef | Iustin Pop | -- | Create an instance. |
92 | 9188aeef | Iustin Pop | -- |
93 | 9188aeef | Iustin Pop | -- Some parameters are not initialized by function, and must be set |
94 | 9188aeef | Iustin Pop | -- later (via 'setIdx' for example). |
95 | 17e7af2b | Iustin Pop | create :: String -> Int -> Int -> Int -> String |
96 | d25643d1 | Iustin Pop | -> [String] -> Bool -> T.Ndx -> T.Ndx -> T.DiskTemplate -> Instance |
97 | c352b0a9 | Iustin Pop | create name_init mem_init dsk_init vcpus_init run_init tags_init |
98 | d25643d1 | Iustin Pop | auto_balance_init pn sn dt = |
99 | 2180829f | Iustin Pop | Instance { name = name_init |
100 | 8bcdde0c | Iustin Pop | , alias = name_init |
101 | 2180829f | Iustin Pop | , mem = mem_init |
102 | 2180829f | Iustin Pop | , dsk = dsk_init |
103 | 2180829f | Iustin Pop | , vcpus = vcpus_init |
104 | a46f34d7 | Iustin Pop | , running = run_init `elem` runningStates |
105 | 2180829f | Iustin Pop | , runSt = run_init |
106 | 2180829f | Iustin Pop | , pNode = pn |
107 | 2180829f | Iustin Pop | , sNode = sn |
108 | 2180829f | Iustin Pop | , idx = -1 |
109 | a7a8f280 | Iustin Pop | , util = T.baseUtil |
110 | 17e7af2b | Iustin Pop | , tags = tags_init |
111 | a182df55 | Iustin Pop | , movable = True |
112 | 0e09422b | Iustin Pop | , autoBalance = auto_balance_init |
113 | d25643d1 | Iustin Pop | , diskTemplate = dt |
114 | 2180829f | Iustin Pop | } |
115 | e4f08c46 | Iustin Pop | |
116 | 9188aeef | Iustin Pop | -- | Changes the index. |
117 | 9188aeef | Iustin Pop | -- |
118 | 9188aeef | Iustin Pop | -- This is used only during the building of the data structures. |
119 | 903a7d46 | Iustin Pop | setIdx :: Instance -- ^ The original instance |
120 | 903a7d46 | Iustin Pop | -> T.Idx -- ^ New index |
121 | 903a7d46 | Iustin Pop | -> Instance -- ^ The modified instance |
122 | 9188aeef | Iustin Pop | setIdx t i = t { idx = i } |
123 | 9188aeef | Iustin Pop | |
124 | 9188aeef | Iustin Pop | -- | Changes the name. |
125 | 9188aeef | Iustin Pop | -- |
126 | 9188aeef | Iustin Pop | -- This is used only during the building of the data structures. |
127 | 9188aeef | Iustin Pop | setName :: Instance -- ^ The original instance |
128 | 9188aeef | Iustin Pop | -> String -- ^ New name |
129 | 903a7d46 | Iustin Pop | -> Instance -- ^ The modified instance |
130 | 8bcdde0c | Iustin Pop | setName t s = t { name = s, alias = s } |
131 | 8bcdde0c | Iustin Pop | |
132 | 8bcdde0c | Iustin Pop | -- | Changes the alias. |
133 | 8bcdde0c | Iustin Pop | -- |
134 | 8bcdde0c | Iustin Pop | -- This is used only during the building of the data structures. |
135 | 8bcdde0c | Iustin Pop | setAlias :: Instance -- ^ The original instance |
136 | 8bcdde0c | Iustin Pop | -> String -- ^ New alias |
137 | 8bcdde0c | Iustin Pop | -> Instance -- ^ The modified instance |
138 | 8bcdde0c | Iustin Pop | setAlias t s = t { alias = s } |
139 | 9188aeef | Iustin Pop | |
140 | 9188aeef | Iustin Pop | -- * Update functions |
141 | 9188aeef | Iustin Pop | |
142 | e4f08c46 | Iustin Pop | -- | Changes the primary node of the instance. |
143 | fd934a28 | Iustin Pop | setPri :: Instance -- ^ the original instance |
144 | 608efcce | Iustin Pop | -> T.Ndx -- ^ the new primary node |
145 | e4f08c46 | Iustin Pop | -> Instance -- ^ the modified instance |
146 | 2060348b | Iustin Pop | setPri t p = t { pNode = p } |
147 | e4f08c46 | Iustin Pop | |
148 | e4f08c46 | Iustin Pop | -- | Changes the secondary node of the instance. |
149 | fd934a28 | Iustin Pop | setSec :: Instance -- ^ the original instance |
150 | 608efcce | Iustin Pop | -> T.Ndx -- ^ the new secondary node |
151 | e4f08c46 | Iustin Pop | -> Instance -- ^ the modified instance |
152 | 2060348b | Iustin Pop | setSec t s = t { sNode = s } |
153 | e4f08c46 | Iustin Pop | |
154 | e4f08c46 | Iustin Pop | -- | Changes both nodes of the instance. |
155 | fd934a28 | Iustin Pop | setBoth :: Instance -- ^ the original instance |
156 | 608efcce | Iustin Pop | -> T.Ndx -- ^ new primary node index |
157 | 608efcce | Iustin Pop | -> T.Ndx -- ^ new secondary node index |
158 | e4f08c46 | Iustin Pop | -> Instance -- ^ the modified instance |
159 | 2060348b | Iustin Pop | setBoth t p s = t { pNode = p, sNode = s } |
160 | c8db97e5 | Iustin Pop | |
161 | a182df55 | Iustin Pop | setMovable :: Instance -- ^ The original instance |
162 | a182df55 | Iustin Pop | -> Bool -- ^ New movable flag |
163 | a182df55 | Iustin Pop | -> Instance -- ^ The modified instance |
164 | a182df55 | Iustin Pop | setMovable t m = t { movable = m } |
165 | a182df55 | Iustin Pop | |
166 | c8db97e5 | Iustin Pop | -- | Try to shrink the instance based on the reason why we can't |
167 | c8db97e5 | Iustin Pop | -- allocate it. |
168 | c8db97e5 | Iustin Pop | shrinkByType :: Instance -> T.FailMode -> T.Result Instance |
169 | 1e3dccc8 | Iustin Pop | shrinkByType inst T.FailMem = let v = mem inst - T.unitMem |
170 | 1e3dccc8 | Iustin Pop | in if v < T.unitMem |
171 | c8db97e5 | Iustin Pop | then T.Bad "out of memory" |
172 | c8db97e5 | Iustin Pop | else T.Ok inst { mem = v } |
173 | 1e3dccc8 | Iustin Pop | shrinkByType inst T.FailDisk = let v = dsk inst - T.unitDsk |
174 | 1e3dccc8 | Iustin Pop | in if v < T.unitDsk |
175 | c8db97e5 | Iustin Pop | then T.Bad "out of disk" |
176 | c8db97e5 | Iustin Pop | else T.Ok inst { dsk = v } |
177 | 1e3dccc8 | Iustin Pop | shrinkByType inst T.FailCPU = let v = vcpus inst - T.unitCpu |
178 | 1e3dccc8 | Iustin Pop | in if v < T.unitCpu |
179 | c8db97e5 | Iustin Pop | then T.Bad "out of vcpus" |
180 | c8db97e5 | Iustin Pop | else T.Ok inst { vcpus = v } |
181 | c8db97e5 | Iustin Pop | shrinkByType _ f = T.Bad $ "Unhandled failure mode " ++ show f |
182 | 83ad1f3c | Iustin Pop | |
183 | 83ad1f3c | Iustin Pop | -- | Return the spec of an instance. |
184 | 83ad1f3c | Iustin Pop | specOf :: Instance -> T.RSpec |
185 | 83ad1f3c | Iustin Pop | specOf Instance { mem = m, dsk = d, vcpus = c } = |
186 | 83ad1f3c | Iustin Pop | T.RSpec { T.rspecCpu = c, T.rspecMem = m, T.rspecDsk = d } |
187 | a10a476a | Iustin Pop | |
188 | a10a476a | Iustin Pop | -- | Computed the number of nodes for a given disk template |
189 | a10a476a | Iustin Pop | requiredNodes :: T.DiskTemplate -> Int |
190 | a10a476a | Iustin Pop | requiredNodes T.DTDrbd8 = 2 |
191 | a10a476a | Iustin Pop | requiredNodes _ = 1 |