root / src / Ganeti / HTools / Program / Hroller.hs @ a947a583
History | View | Annotate | Download (11.9 kB)
1 |
{-| Cluster rolling maintenance helper. |
---|---|
2 |
|
3 |
-} |
4 |
|
5 |
{- |
6 |
|
7 |
Copyright (C) 2012 Google Inc. |
8 |
|
9 |
This program is free software; you can redistribute it and/or modify |
10 |
it under the terms of the GNU General Public License as published by |
11 |
the Free Software Foundation; either version 2 of the License, or |
12 |
(at your option) any later version. |
13 |
|
14 |
This program is distributed in the hope that it will be useful, but |
15 |
WITHOUT ANY WARRANTY; without even the implied warranty of |
16 |
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
17 |
General Public License for more details. |
18 |
|
19 |
You should have received a copy of the GNU General Public License |
20 |
along with this program; if not, write to the Free Software |
21 |
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
22 |
02110-1301, USA. |
23 |
|
24 |
-} |
25 |
|
26 |
module Ganeti.HTools.Program.Hroller |
27 |
( main |
28 |
, options |
29 |
, arguments |
30 |
) where |
31 |
|
32 |
import Control.Applicative |
33 |
import Control.Arrow |
34 |
import Control.Monad |
35 |
import Data.Function |
36 |
import Data.List |
37 |
import Data.Ord |
38 |
import Text.Printf |
39 |
|
40 |
import qualified Data.IntMap as IntMap |
41 |
|
42 |
import qualified Ganeti.HTools.Container as Container |
43 |
import qualified Ganeti.HTools.Node as Node |
44 |
import qualified Ganeti.HTools.Instance as Instance |
45 |
import qualified Ganeti.HTools.Group as Group |
46 |
|
47 |
import Ganeti.BasicTypes |
48 |
import Ganeti.Common |
49 |
import Ganeti.HTools.CLI |
50 |
import Ganeti.HTools.ExtLoader |
51 |
import Ganeti.HTools.Graph |
52 |
import Ganeti.HTools.Loader |
53 |
import Ganeti.HTools.Types |
54 |
import Ganeti.Utils |
55 |
|
56 |
-- | Options list and functions. |
57 |
options :: IO [OptType] |
58 |
options = do |
59 |
luxi <- oLuxiSocket |
60 |
return |
61 |
[ luxi |
62 |
, oRapiMaster |
63 |
, oDataFile |
64 |
, oIAllocSrc |
65 |
, oOfflineNode |
66 |
, oOfflineMaintenance |
67 |
, oVerbose |
68 |
, oQuiet |
69 |
, oNoHeaders |
70 |
, oNodeTags |
71 |
, oSaveCluster |
72 |
, oGroup |
73 |
, oPrintMoves |
74 |
, oSkipNonRedundant |
75 |
, oIgnoreNonRedundant |
76 |
, oForce |
77 |
, oOneStepOnly |
78 |
] |
79 |
|
80 |
-- | The list of arguments supported by the program. |
81 |
arguments :: [ArgCompletion] |
82 |
arguments = [] |
83 |
|
84 |
-- | Compute the result of moving an instance to a different node. |
85 |
move :: Idx -> Ndx -> (Node.List, Instance.List) |
86 |
-> OpResult (Node.List, Instance.List) |
87 |
move idx new_ndx (nl, il) = do |
88 |
let new_node = Container.find new_ndx nl |
89 |
inst = Container.find idx il |
90 |
old_ndx = Instance.pNode inst |
91 |
old_node = Container.find old_ndx nl |
92 |
new_node' <- Node.addPriEx True new_node inst |
93 |
let old_node' = Node.removePri old_node inst |
94 |
inst' = Instance.setPri inst new_ndx |
95 |
nl' = Container.addTwo old_ndx old_node' new_ndx new_node' nl |
96 |
il' = Container.add idx inst' il |
97 |
return (nl', il') |
98 |
|
99 |
-- | Move a non-redundant instance to one of the candidate nodes mentioned. |
100 |
locateInstance :: Idx -> [Ndx] -> (Node.List, Instance.List) |
101 |
-> Result (Node.List, Instance.List) |
102 |
locateInstance idx ndxs conf = |
103 |
msum $ map (opToResult . flip (move idx) conf) ndxs |
104 |
|
105 |
-- | Move a list of non-redundant instances to some of the nodes mentioned. |
106 |
locateInstances :: [Idx] -> [Ndx] -> (Node.List, Instance.List) |
107 |
-> Result (Node.List, Instance.List) |
108 |
locateInstances idxs ndxs conf = |
109 |
foldM (\ cf idx -> locateInstance idx ndxs cf) conf idxs |
110 |
|
111 |
|
112 |
-- | Greedily clear a node of a kind of instances by a given relocation method. |
113 |
-- The arguments are a function providing the list of instances to be cleared, |
114 |
-- the relocation function, the list of nodes to be cleared, a list of nodes |
115 |
-- that can be relocated to, and the initial configuration. Returned is a list |
116 |
-- of nodes that can be cleared simultaneously and the configuration after |
117 |
-- clearing these nodes. |
118 |
greedyClearNodes :: ((Node.List, Instance.List) -> Ndx -> [Idx]) |
119 |
-> ([Idx] -> [Ndx] -> (Node.List, Instance.List) |
120 |
-> Result (Node.List, Instance.List)) |
121 |
-> [Ndx] -> [Ndx] -> (Node.List, Instance.List) |
122 |
-> Result ([Ndx], (Node.List, Instance.List)) |
123 |
greedyClearNodes _ _ [] _ conf = return ([], conf) |
124 |
greedyClearNodes getInstances relocate (ndx:ndxs) targets conf@(nl, _) = |
125 |
withFirst `mplus` withoutFirst where |
126 |
withFirst = do |
127 |
let othernodes = delete ndx targets |
128 |
grp = Node.group $ Container.find ndx nl |
129 |
othernodesSameGroup = |
130 |
filter ((==) grp . Node.group . flip Container.find nl) othernodes |
131 |
conf' <- relocate (getInstances conf ndx) othernodesSameGroup conf |
132 |
(ndxs', conf'') <- greedyClearNodes getInstances relocate |
133 |
ndxs othernodes conf' |
134 |
return (ndx:ndxs', conf'') |
135 |
withoutFirst = greedyClearNodes getInstances relocate ndxs targets conf |
136 |
|
137 |
-- | Greedily move the non-redundant instances away from a list of nodes. |
138 |
-- Returns a list of ndoes that can be cleared simultaneously and the |
139 |
-- configuration after clearing these nodes. |
140 |
clearNodes :: [Ndx] -> [Ndx] -> (Node.List, Instance.List) |
141 |
-> Result ([Ndx], (Node.List, Instance.List)) |
142 |
clearNodes = greedyClearNodes nonRedundant locateInstances |
143 |
|
144 |
-- | Parition a list of nodes into chunks according cluster capacity. |
145 |
partitionNonRedundant :: [Ndx] -> [Ndx] -> (Node.List, Instance.List) |
146 |
-> Result [([Ndx], (Node.List, Instance.List))] |
147 |
partitionNonRedundant [] _ _ = return [] |
148 |
partitionNonRedundant ndxs targets conf = do |
149 |
(grp, conf') <- clearNodes ndxs targets conf |
150 |
guard . not . null $ grp |
151 |
let remaining = ndxs \\ grp |
152 |
part <- partitionNonRedundant remaining targets conf |
153 |
return $ (grp, conf') : part |
154 |
|
155 |
-- | Gather statistics for the coloring algorithms. |
156 |
-- Returns a string with a summary on how each algorithm has performed, |
157 |
-- in order of non-decreasing effectiveness, and whether it tied or lost |
158 |
-- with the previous one. |
159 |
getStats :: [(String, ColorVertMap)] -> String |
160 |
getStats colorings = snd . foldr helper (0,"") $ algBySize colorings |
161 |
where algostat (algo, cmap) = algo ++ ": " ++ size cmap ++ grpsizes cmap |
162 |
size cmap = show (IntMap.size cmap) ++ " " |
163 |
grpsizes cmap = |
164 |
"(" ++ commaJoin (map (show.length) (IntMap.elems cmap)) ++ ")" |
165 |
algBySize = sortBy (flip (comparing (IntMap.size.snd))) |
166 |
helper :: (String, ColorVertMap) -> (Int, String) -> (Int, String) |
167 |
helper el (0, _) = ((IntMap.size.snd) el, algostat el) |
168 |
helper el (old, str) |
169 |
| old == elsize = (elsize, str ++ " TIE " ++ algostat el) |
170 |
| otherwise = (elsize, str ++ " LOOSE " ++ algostat el) |
171 |
where elsize = (IntMap.size.snd) el |
172 |
|
173 |
-- | Predicate of belonging to a given group restriction. |
174 |
hasGroup :: Maybe Group.Group -> Node.Node -> Bool |
175 |
hasGroup Nothing _ = True |
176 |
hasGroup (Just grp) node = Node.group node == Group.idx grp |
177 |
|
178 |
-- | Predicate of having at least one tag in a given set. |
179 |
hasTag :: Maybe [String] -> Node.Node -> Bool |
180 |
hasTag Nothing _ = True |
181 |
hasTag (Just tags) node = not . null $ Node.nTags node `intersect` tags |
182 |
|
183 |
-- | From a cluster configuration, get the list of non-redundant instances |
184 |
-- of a node. |
185 |
nonRedundant :: (Node.List, Instance.List) -> Ndx -> [Idx] |
186 |
nonRedundant (nl, il) ndx = |
187 |
filter (not . Instance.hasSecondary . flip Container.find il) $ |
188 |
Node.pList (Container.find ndx nl) |
189 |
|
190 |
-- | Within a cluster configuration, decide if the node hosts non-redundant |
191 |
-- Instances. |
192 |
noNonRedundant :: (Node.List, Instance.List) -> Node.Node -> Bool |
193 |
noNonRedundant conf = null . nonRedundant conf . Node.idx |
194 |
|
195 |
-- | Put the master node last. |
196 |
-- Reorder a list groups of nodes (with additional information) such that the |
197 |
-- master node (if present) is the last node of the last group. |
198 |
masterLast :: [([Node.Node], a)] -> [([Node.Node], a)] |
199 |
masterLast rebootgroups = |
200 |
map (first $ uncurry (++)) . uncurry (++) . partition (null . snd . fst) $ |
201 |
map (first $ partition (not . Node.isMaster)) rebootgroups |
202 |
|
203 |
-- | From two configurations compute the list of moved instances. |
204 |
getMoves :: (Node.List, Instance.List) -> (Node.List, Instance.List) |
205 |
-> [(Instance.Instance, Node.Node)] |
206 |
getMoves (_, il) (nl', il') = do |
207 |
ix <- Container.keys il |
208 |
let inst = Container.find ix il |
209 |
inst' = Container.find ix il' |
210 |
guard $ Instance.pNode inst /= Instance.pNode inst' |
211 |
return (inst', Container.find (Instance.pNode inst') nl') |
212 |
|
213 |
-- | Main function. |
214 |
main :: Options -> [String] -> IO () |
215 |
main opts args = do |
216 |
unless (null args) $ exitErr "This program doesn't take any arguments." |
217 |
|
218 |
let verbose = optVerbose opts |
219 |
maybeExit = if optForce opts then warn else exitErr |
220 |
|
221 |
-- Load cluster data. The last two arguments, cluster tags and ipolicy, are |
222 |
-- currently not used by this tool. |
223 |
ini_cdata@(ClusterData gl fixed_nl ilf _ _) <- loadExternalData opts |
224 |
|
225 |
let master_names = map Node.name . filter Node.isMaster . IntMap.elems $ |
226 |
fixed_nl |
227 |
case master_names of |
228 |
[] -> maybeExit "No master node found (maybe not supported by backend)." |
229 |
[ _ ] -> return () |
230 |
_ -> exitErr $ "Found more than one master node: " ++ show master_names |
231 |
|
232 |
nlf <- setNodeStatus opts fixed_nl |
233 |
|
234 |
maybeSaveData (optSaveCluster opts) "original" "before hroller run" ini_cdata |
235 |
|
236 |
-- Find the wanted node group, if any. |
237 |
wantedGroup <- case optGroup opts of |
238 |
Nothing -> return Nothing |
239 |
Just name -> case Container.findByName gl name of |
240 |
Nothing -> exitErr "Cannot find target group." |
241 |
Just grp -> return (Just grp) |
242 |
|
243 |
let nodes = IntMap.filter (foldl (liftA2 (&&)) (const True) |
244 |
[ not . Node.offline |
245 |
, if optSkipNonRedundant opts |
246 |
then noNonRedundant (nlf, ilf) |
247 |
else const True |
248 |
, hasTag $ optNodeTags opts |
249 |
, hasGroup wantedGroup ]) |
250 |
nlf |
251 |
mkGraph = if optOfflineMaintenance opts |
252 |
then Node.mkNodeGraph |
253 |
else Node.mkRebootNodeGraph nlf |
254 |
|
255 |
nodeGraph <- case mkGraph nodes ilf of |
256 |
Nothing -> exitErr "Cannot create node graph" |
257 |
Just g -> return g |
258 |
|
259 |
when (verbose > 2) . putStrLn $ "Node Graph: " ++ show nodeGraph |
260 |
|
261 |
let colorAlgorithms = [ ("LF", colorLF) |
262 |
, ("Dsatur", colorDsatur) |
263 |
, ("Dcolor", colorDcolor) |
264 |
] |
265 |
colorings = map (\(v,a) -> (v,(colorVertMap.a) nodeGraph)) colorAlgorithms |
266 |
smallestColoring = IntMap.elems $ |
267 |
(snd . minimumBy (comparing (IntMap.size . snd))) colorings |
268 |
allNdx = map Node.idx . filter (not . Node.offline) . Container.elems |
269 |
$ nlf |
270 |
splitted = mapM (\ grp -> partitionNonRedundant grp allNdx (nlf,ilf)) |
271 |
smallestColoring |
272 |
rebootGroups <- if optIgnoreNonRedundant opts |
273 |
then return $ zip smallestColoring (repeat (nlf, ilf)) |
274 |
else case splitted of |
275 |
Ok splitgroups -> return $ concat splitgroups |
276 |
Bad _ -> exitErr "Not enough capacity to move\ |
277 |
\ non-redundant instances" |
278 |
let idToNode = (`Container.find` nodes) |
279 |
nodesRebootGroups = |
280 |
map (first $ map idToNode . filter (`IntMap.member` nodes)) rebootGroups |
281 |
outputRebootGroups = masterLast . |
282 |
sortBy (flip compare `on` length . fst) $ |
283 |
nodesRebootGroups |
284 |
confToMoveNames = map (Instance.name *** Node.name) . getMoves (nlf, ilf) |
285 |
namesAndMoves = map (map Node.name *** confToMoveNames) outputRebootGroups |
286 |
|
287 |
when (verbose > 1) . putStrLn $ getStats colorings |
288 |
|
289 |
let showGroup = if optOneStepOnly opts |
290 |
then mapM_ putStrLn |
291 |
else putStrLn . commaJoin |
292 |
showMoves :: [(String, String)] -> IO () |
293 |
showMoves = if optPrintMoves opts |
294 |
then mapM_ $ putStrLn . uncurry (printf " %s %s") |
295 |
else const $ return () |
296 |
showBoth = liftM2 (>>) (showGroup . fst) (showMoves . snd) |
297 |
|
298 |
|
299 |
if optOneStepOnly opts |
300 |
then do |
301 |
unless (optNoHeaders opts) $ |
302 |
putStrLn "'First Reboot Group'" |
303 |
case namesAndMoves of |
304 |
[] -> return () |
305 |
y : _ -> showBoth y |
306 |
else do |
307 |
unless (optNoHeaders opts) $ |
308 |
putStrLn "'Node Reboot Groups'" |
309 |
mapM_ showBoth namesAndMoves |