1 {-| Implementation of command-line functions.
3 This module holds the common command-line related functions for the
4 binaries, separated into this module since "Ganeti.HTools.Utils" is
5 used in many other places and this is more IO oriented.
11 Copyright (C) 2009, 2010, 2011 Google Inc.
13 This program is free software; you can redistribute it and/or modify
14 it under the terms of the GNU General Public License as published by
15 the Free Software Foundation; either version 2 of the License, or
16 (at your option) any later version.
18 This program is distributed in the hope that it will be useful, but
19 WITHOUT ANY WARRANTY; without even the implied warranty of
20 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
21 General Public License for more details.
23 You should have received a copy of the GNU General Public License
24 along with this program; if not, write to the Free Software
25 Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
30 module Ganeti.HTools.CLI
79 import Data.Maybe (fromMaybe)
80 import qualified Data.Version
81 import System.Console.GetOpt
85 import Text.Printf (printf)
87 import qualified Ganeti.HTools.Version as Version(version)
88 import qualified Ganeti.Constants as C
89 import Ganeti.HTools.Types
90 import Ganeti.HTools.Utils
94 -- | The default value for the luxi socket.
96 -- This is re-exported from the "Ganeti.Constants" module.
97 defaultLuxiSocket :: FilePath
98 defaultLuxiSocket = C.masterSocket
102 -- | Command line options structure.
103 data Options = Options
104 { optDataFile :: Maybe FilePath -- ^ Path to the cluster data file
105 , optDiskMoves :: Bool -- ^ Allow disk moves
106 , optInstMoves :: Bool -- ^ Allow instance moves
107 , optDynuFile :: Maybe FilePath -- ^ Optional file with dynamic use data
108 , optEvacMode :: Bool -- ^ Enable evacuation mode
109 , optExInst :: [String] -- ^ Instances to be excluded
110 , optExTags :: Maybe [String] -- ^ Tags to use for exclusion
111 , optExecJobs :: Bool -- ^ Execute the commands via Luxi
112 , optGroup :: Maybe GroupID -- ^ The UUID of the group to process
113 , optSelInst :: [String] -- ^ Instances to be excluded
114 , optINodes :: Int -- ^ Nodes required for an instance
115 , optISpec :: RSpec -- ^ Requested instance specs
116 , optLuxi :: Maybe FilePath -- ^ Collect data from Luxi
117 , optMaster :: String -- ^ Collect data from RAPI
118 , optMaxLength :: Int -- ^ Stop after this many steps
119 , optMcpu :: Double -- ^ Max cpu ratio for nodes
120 , optMdsk :: Double -- ^ Max disk usage ratio for nodes
121 , optMinGain :: Score -- ^ Min gain we aim for in a step
122 , optMinGainLim :: Score -- ^ Limit below which we apply mingain
123 , optMinScore :: Score -- ^ The minimum score we aim for
124 , optNoHeaders :: Bool -- ^ Do not show a header line
125 , optNodeSim :: [String] -- ^ Cluster simulation mode
126 , optOffline :: [String] -- ^ Names of offline nodes
127 , optOneline :: Bool -- ^ Switch output to a single line
128 , optOutPath :: FilePath -- ^ Path to the output directory
129 , optSaveCluster :: Maybe FilePath -- ^ Save cluster state to this file
130 , optShowCmds :: Maybe FilePath -- ^ Whether to show the command list
131 , optShowHelp :: Bool -- ^ Just show the help
132 , optShowInsts :: Bool -- ^ Whether to show the instance map
133 , optShowNodes :: Maybe [String] -- ^ Whether to show node status
134 , optShowVer :: Bool -- ^ Just show the program version
135 , optTieredSpec :: Maybe RSpec -- ^ Requested specs for tiered mode
136 , optReplay :: Maybe String -- ^ Unittests: RNG state
137 , optVerbose :: Int -- ^ Verbosity level
140 -- | Default values for the command line options.
141 defaultOptions :: Options
142 defaultOptions = Options
143 { optDataFile = Nothing
144 , optDiskMoves = True
145 , optInstMoves = True
146 , optDynuFile = Nothing
147 , optEvacMode = False
149 , optExTags = Nothing
150 , optExecJobs = False
154 , optISpec = RSpec 1 4096 102400
158 , optMcpu = defVcpuRatio
159 , optMdsk = defReservedDiskRatio
161 , optMinGainLim = 1e-1
163 , optNoHeaders = False
168 , optSaveCluster = Nothing
169 , optShowCmds = Nothing
170 , optShowHelp = False
171 , optShowInsts = False
172 , optShowNodes = Nothing
174 , optTieredSpec = Nothing
175 , optReplay = Nothing
179 -- | Abrreviation for the option type.
180 type OptType = OptDescr (Options -> Result Options)
182 -- * Command line options
185 oDataFile = Option "t" ["text-data"]
186 (ReqArg (\ f o -> Ok o { optDataFile = Just f }) "FILE")
187 "the cluster data FILE"
189 oDiskMoves :: OptType
190 oDiskMoves = Option "" ["no-disk-moves"]
191 (NoArg (\ opts -> Ok opts { optDiskMoves = False}))
192 "disallow disk moves from the list of allowed instance changes,\
193 \ thus allowing only the 'cheap' failover/migrate operations"
196 oSelInst = Option "" ["select-instances"]
197 (ReqArg (\ f opts -> Ok opts { optSelInst = sepSplit ',' f }) "INSTS")
198 "only select given instances for any moves"
200 oInstMoves :: OptType
201 oInstMoves = Option "" ["no-instance-moves"]
202 (NoArg (\ opts -> Ok opts { optInstMoves = False}))
203 "disallow instance (primary node) moves from the list of allowed,\
204 \ instance changes, thus allowing only slower, but sometimes\
205 \ safer, drbd secondary changes"
208 oDynuFile = Option "U" ["dynu-file"]
209 (ReqArg (\ f opts -> Ok opts { optDynuFile = Just f }) "FILE")
210 "Import dynamic utilisation data from the given FILE"
213 oEvacMode = Option "E" ["evac-mode"]
214 (NoArg (\opts -> Ok opts { optEvacMode = True }))
215 "enable evacuation mode, where the algorithm only moves \
216 \ instances away from offline and drained nodes"
219 oExInst = Option "" ["exclude-instances"]
220 (ReqArg (\ f opts -> Ok opts { optExInst = sepSplit ',' f }) "INSTS")
221 "exclude given instances from any moves"
224 oExTags = Option "" ["exclusion-tags"]
225 (ReqArg (\ f opts -> Ok opts { optExTags = Just $ sepSplit ',' f })
226 "TAG,...") "Enable instance exclusion based on given tag prefix"
229 oExecJobs = Option "X" ["exec"]
230 (NoArg (\ opts -> Ok opts { optExecJobs = True}))
231 "execute the suggested moves via Luxi (only available when using\
232 \ it for data gathering)"
235 oGroup = Option "G" ["group"]
236 (ReqArg (\ f o -> Ok o { optGroup = Just f }) "ID")
237 "the ID of the group to balance"
240 oIDisk = Option "" ["disk"]
242 let ospec = optISpec opts
243 nspec = ospec { rspecDsk = read d }
244 in Ok opts { optISpec = nspec }) "DISK")
245 "disk size for instances"
248 oIMem = Option "" ["memory"]
250 let ospec = optISpec opts
251 nspec = ospec { rspecMem = read m }
252 in Ok opts { optISpec = nspec }) "MEMORY")
253 "memory size for instances"
256 oINodes = Option "" ["req-nodes"]
257 (ReqArg (\ n opts -> Ok opts { optINodes = read n }) "NODES")
258 "number of nodes for the new instances (1=plain, 2=mirrored)"
261 oIVcpus = Option "" ["vcpus"]
263 let ospec = optISpec opts
264 nspec = ospec { rspecCpu = read p }
265 in Ok opts { optISpec = nspec }) "NUM")
266 "number of virtual cpus for instances"
268 oLuxiSocket :: OptType
269 oLuxiSocket = Option "L" ["luxi"]
270 (OptArg ((\ f opts -> Ok opts { optLuxi = Just f }) .
271 fromMaybe defaultLuxiSocket) "SOCKET")
272 "collect data via Luxi, optionally using the given SOCKET path"
275 oMaxCpu = Option "" ["max-cpu"]
276 (ReqArg (\ n opts -> Ok opts { optMcpu = read n }) "RATIO")
277 "maximum virtual-to-physical cpu ratio for nodes (from 1\
280 oMaxSolLength :: OptType
281 oMaxSolLength = Option "l" ["max-length"]
282 (ReqArg (\ i opts -> Ok opts { optMaxLength = read i }) "N")
283 "cap the solution at this many moves (useful for very\
284 \ unbalanced clusters)"
287 oMinDisk = Option "" ["min-disk"]
288 (ReqArg (\ n opts -> Ok opts { optMdsk = read n }) "RATIO")
289 "minimum free disk space for nodes (between 0 and 1) [0]"
292 oMinGain = Option "g" ["min-gain"]
293 (ReqArg (\ g opts -> Ok opts { optMinGain = read g }) "DELTA")
294 "minimum gain to aim for in a balancing step before giving up"
296 oMinGainLim :: OptType
297 oMinGainLim = Option "" ["min-gain-limit"]
298 (ReqArg (\ g opts -> Ok opts { optMinGainLim = read g }) "SCORE")
299 "minimum cluster score for which we start checking the min-gain"
302 oMinScore = Option "e" ["min-score"]
303 (ReqArg (\ e opts -> Ok opts { optMinScore = read e }) "EPSILON")
304 "mininum score to aim for"
306 oNoHeaders :: OptType
307 oNoHeaders = Option "" ["no-headers"]
308 (NoArg (\ opts -> Ok opts { optNoHeaders = True }))
309 "do not show a header line"
312 oNodeSim = Option "" ["simulate"]
313 (ReqArg (\ f o -> Ok o { optNodeSim = f:optNodeSim o }) "SPEC")
314 "simulate an empty cluster, given as 'num_nodes,disk,ram,cpu'"
316 oOfflineNode :: OptType
317 oOfflineNode = Option "O" ["offline"]
318 (ReqArg (\ n o -> Ok o { optOffline = n:optOffline o }) "NODE")
319 "set node as offline"
322 oOneline = Option "o" ["oneline"]
323 (NoArg (\ opts -> Ok opts { optOneline = True }))
324 "print the ganeti command list for reaching the solution"
326 oOutputDir :: OptType
327 oOutputDir = Option "d" ["output-dir"]
328 (ReqArg (\ d opts -> Ok opts { optOutPath = d }) "PATH")
329 "directory in which to write output files"
331 oPrintCommands :: OptType
332 oPrintCommands = Option "C" ["print-commands"]
333 (OptArg ((\ f opts -> Ok opts { optShowCmds = Just f }) .
336 "print the ganeti command list for reaching the solution,\
337 \ if an argument is passed then write the commands to a\
338 \ file named as such"
340 oPrintInsts :: OptType
341 oPrintInsts = Option "" ["print-instances"]
342 (NoArg (\ opts -> Ok opts { optShowInsts = True }))
343 "print the final instance map"
345 oPrintNodes :: OptType
346 oPrintNodes = Option "p" ["print-nodes"]
347 (OptArg ((\ f opts ->
348 let (prefix, realf) = case f of
349 '+':rest -> (["+"], rest)
351 splitted = prefix ++ sepSplit ',' realf
352 in Ok opts { optShowNodes = Just splitted }) .
353 fromMaybe []) "FIELDS")
354 "print the final node list"
357 oQuiet = Option "q" ["quiet"]
358 (NoArg (\ opts -> Ok opts { optVerbose = optVerbose opts - 1 }))
359 "decrease the verbosity level"
361 oRapiMaster :: OptType
362 oRapiMaster = Option "m" ["master"]
363 (ReqArg (\ m opts -> Ok opts { optMaster = m }) "ADDRESS")
364 "collect data via RAPI at the given ADDRESS"
366 oSaveCluster :: OptType
367 oSaveCluster = Option "S" ["save"]
368 (ReqArg (\ f opts -> Ok opts { optSaveCluster = Just f }) "FILE")
369 "Save cluster state at the end of the processing to FILE"
372 oShowHelp = Option "h" ["help"]
373 (NoArg (\ opts -> Ok opts { optShowHelp = True}))
377 oShowVer = Option "V" ["version"]
378 (NoArg (\ opts -> Ok opts { optShowVer = True}))
379 "show the version of the program"
381 oTieredSpec :: OptType
382 oTieredSpec = Option "" ["tiered-alloc"]
383 (ReqArg (\ inp opts -> do
384 let sp = sepSplit ',' inp
385 prs <- mapM (tryRead "tiered specs") sp
388 [dsk, ram, cpu] -> return $ RSpec cpu ram dsk
389 _ -> Bad $ "Invalid specification: " ++ inp ++
390 ", expected disk,ram,cpu"
391 return $ opts { optTieredSpec = Just tspec } )
393 "enable tiered specs allocation, given as 'disk,ram,cpu'"
396 oReplay = Option "" ["replay"]
397 (ReqArg (\ stat opts -> Ok opts { optReplay = Just stat } ) "STATE")
398 "Pre-seed the random number generator with STATE"
401 oVerbose = Option "v" ["verbose"]
402 (NoArg (\ opts -> Ok opts { optVerbose = optVerbose opts + 1 }))
403 "increase the verbosity level"
408 usageHelp :: String -> [OptType] -> String
410 usageInfo (printf "%s %s\nUsage: %s [OPTION...]"
411 progname Version.version progname)
413 -- | Command line parser, using the 'Options' structure.
414 parseOpts :: [String] -- ^ The command line arguments
415 -> String -- ^ The program name
416 -> [OptType] -- ^ The supported command line options
417 -> IO (Options, [String]) -- ^ The resulting options and leftover
419 parseOpts argv progname options =
420 case getOpt Permute options argv of
423 let (pr, args) = (foldM (flip id) defaultOptions o, n)
426 hPutStrLn stderr "Error while parsing command\
429 exitWith $ ExitFailure 1
430 Ok val -> return val)
431 when (optShowHelp po) $ do
432 putStr $ usageHelp progname options
434 when (optShowVer po) $ do
435 printf "%s %s\ncompiled with %s %s\nrunning on %s %s\n"
436 progname Version.version
437 compilerName (Data.Version.showVersion compilerVersion)
442 hPutStrLn stderr $ "Command line error: " ++ concat errs
443 hPutStrLn stderr $ usageHelp progname options
444 exitWith $ ExitFailure 2
446 -- | A shell script template for autogenerated scripts.
449 printf "#!/bin/sh\n\n\
450 \# Auto-generated script for executing cluster rebalancing\n\n\
451 \# To stop, touch the file /tmp/stop-htools\n\n\
454 \ if [ -f /tmp/stop-htools ]; then\n\
455 \ echo 'Stop requested, exiting'\n\
460 -- | Optionally print the node list.
461 maybePrintNodes :: Maybe [String] -- ^ The field list
462 -> String -- ^ Informational message
463 -> ([String] -> String) -- ^ Function to generate the listing
465 maybePrintNodes Nothing _ _ = return ()
466 maybePrintNodes (Just fields) msg fn = do
468 hPutStrLn stderr (msg ++ " status:")
469 hPutStrLn stderr $ fn fields
472 -- | Optionally print the instance list.
473 maybePrintInsts :: Bool -- ^ Whether to print the instance list
474 -> String -- ^ Type of the instance map (e.g. initial)
475 -> String -- ^ The instance data
477 maybePrintInsts do_print msg instdata =
480 hPutStrLn stderr $ msg ++ " instance map:"
481 hPutStr stderr instdata