root / htools / Ganeti / HTools / CLI.hs @ e73c5fe2
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{-| Implementation of command-line functions. |
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|
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This module holds the common command-line related functions for the |
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binaries, separated into this module since "Ganeti.HTools.Utils" is |
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used in many other places and this is more IO oriented. |
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|
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-} |
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|
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{- |
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|
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Copyright (C) 2009, 2010, 2011 Google Inc. |
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|
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This program is free software; you can redistribute it and/or modify |
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it under the terms of the GNU General Public License as published by |
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the Free Software Foundation; either version 2 of the License, or |
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(at your option) any later version. |
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|
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This program is distributed in the hope that it will be useful, but |
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WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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General Public License for more details. |
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|
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You should have received a copy of the GNU General Public License |
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along with this program; if not, write to the Free Software |
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
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02110-1301, USA. |
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|
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-} |
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|
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module Ganeti.HTools.CLI |
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( Options(..) |
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, OptType |
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, parseOpts |
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, shTemplate |
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, defaultLuxiSocket |
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, maybePrintNodes |
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, maybePrintInsts |
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, maybeShowWarnings |
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, setNodeStatus |
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-- * The options |
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, oDataFile |
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, oDiskMoves |
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, oDiskTemplate |
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, oDynuFile |
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, oEvacMode |
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, oExInst |
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, oExTags |
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, oExecJobs |
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, oGroup |
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, oInstMoves |
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, oLuxiSocket |
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, oMachineReadable |
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, oMaxCpu |
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, oMaxSolLength |
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, oMinDisk |
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, oMinGain |
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, oMinGainLim |
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, oMinScore |
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, oNoHeaders |
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, oNodeSim |
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, oOfflineNode |
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, oOutputDir |
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, oPrintCommands |
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, oPrintInsts |
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, oPrintNodes |
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, oQuiet |
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, oRapiMaster |
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, oReplay |
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, oSaveCluster |
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, oSelInst |
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, oShowHelp |
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, oShowVer |
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, oStdSpec |
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, oTieredSpec |
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, oVerbose |
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) where |
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|
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import Control.Monad |
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import Data.Maybe (fromMaybe) |
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import qualified Data.Version |
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import System.Console.GetOpt |
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import System.IO |
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import System.Info |
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import System.Exit |
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import Text.Printf (printf, hPrintf) |
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|
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import qualified Ganeti.HTools.Version as Version(version) |
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import qualified Ganeti.HTools.Container as Container |
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import qualified Ganeti.HTools.Node as Node |
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import qualified Ganeti.Constants as C |
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import Ganeti.HTools.Types |
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import Ganeti.HTools.Utils |
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import Ganeti.HTools.Loader |
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|
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-- * Constants |
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|
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-- | The default value for the luxi socket. |
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-- |
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-- This is re-exported from the "Ganeti.Constants" module. |
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defaultLuxiSocket :: FilePath |
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defaultLuxiSocket = C.masterSocket |
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|
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-- * Data types |
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|
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-- | Command line options structure. |
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data Options = Options |
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{ optDataFile :: Maybe FilePath -- ^ Path to the cluster data file |
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, optDiskMoves :: Bool -- ^ Allow disk moves |
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, optInstMoves :: Bool -- ^ Allow instance moves |
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, optDiskTemplate :: Maybe DiskTemplate -- ^ Override for the disk template |
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, optDynuFile :: Maybe FilePath -- ^ Optional file with dynamic use data |
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, optEvacMode :: Bool -- ^ Enable evacuation mode |
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, optExInst :: [String] -- ^ Instances to be excluded |
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, optExTags :: Maybe [String] -- ^ Tags to use for exclusion |
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, optExecJobs :: Bool -- ^ Execute the commands via Luxi |
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, optGroup :: Maybe GroupID -- ^ The UUID of the group to process |
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, optSelInst :: [String] -- ^ Instances to be excluded |
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, optLuxi :: Maybe FilePath -- ^ Collect data from Luxi |
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, optMachineReadable :: Bool -- ^ Output machine-readable format |
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, optMaster :: String -- ^ Collect data from RAPI |
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, optMaxLength :: Int -- ^ Stop after this many steps |
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, optMcpu :: Double -- ^ Max cpu ratio for nodes |
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, optMdsk :: Double -- ^ Max disk usage ratio for nodes |
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, optMinGain :: Score -- ^ Min gain we aim for in a step |
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, optMinGainLim :: Score -- ^ Limit below which we apply mingain |
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, optMinScore :: Score -- ^ The minimum score we aim for |
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, optNoHeaders :: Bool -- ^ Do not show a header line |
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, optNodeSim :: [String] -- ^ Cluster simulation mode |
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, optOffline :: [String] -- ^ Names of offline nodes |
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, optOutPath :: FilePath -- ^ Path to the output directory |
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, optSaveCluster :: Maybe FilePath -- ^ Save cluster state to this file |
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, optShowCmds :: Maybe FilePath -- ^ Whether to show the command list |
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, optShowHelp :: Bool -- ^ Just show the help |
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, optShowInsts :: Bool -- ^ Whether to show the instance map |
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, optShowNodes :: Maybe [String] -- ^ Whether to show node status |
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, optShowVer :: Bool -- ^ Just show the program version |
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, optStdSpec :: Maybe RSpec -- ^ Requested standard specs |
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, optTieredSpec :: Maybe RSpec -- ^ Requested specs for tiered mode |
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, optReplay :: Maybe String -- ^ Unittests: RNG state |
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, optVerbose :: Int -- ^ Verbosity level |
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} deriving Show |
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|
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-- | Default values for the command line options. |
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defaultOptions :: Options |
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defaultOptions = Options |
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{ optDataFile = Nothing |
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, optDiskMoves = True |
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, optInstMoves = True |
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, optDiskTemplate = Nothing |
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, optDynuFile = Nothing |
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, optEvacMode = False |
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, optExInst = [] |
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, optExTags = Nothing |
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, optExecJobs = False |
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, optGroup = Nothing |
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, optSelInst = [] |
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, optLuxi = Nothing |
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, optMachineReadable = False |
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, optMaster = "" |
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, optMaxLength = -1 |
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, optMcpu = defVcpuRatio |
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, optMdsk = defReservedDiskRatio |
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, optMinGain = 1e-2 |
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, optMinGainLim = 1e-1 |
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, optMinScore = 1e-9 |
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, optNoHeaders = False |
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, optNodeSim = [] |
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, optOffline = [] |
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, optOutPath = "." |
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, optSaveCluster = Nothing |
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, optShowCmds = Nothing |
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, optShowHelp = False |
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, optShowInsts = False |
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, optShowNodes = Nothing |
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, optShowVer = False |
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, optStdSpec = Nothing |
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, optTieredSpec = Nothing |
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, optReplay = Nothing |
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, optVerbose = 1 |
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} |
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|
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-- | Abrreviation for the option type. |
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type OptType = OptDescr (Options -> Result Options) |
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|
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-- * Helper functions |
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|
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parseISpecString :: String -> String -> Result RSpec |
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parseISpecString descr inp = do |
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let sp = sepSplit ',' inp |
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prs <- mapM (\(fn, val) -> fn val) $ |
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zip [ annotateResult (descr ++ " specs memory") . parseUnit |
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, annotateResult (descr ++ " specs disk") . parseUnit |
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, tryRead (descr ++ " specs cpus") |
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] sp |
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case prs of |
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[dsk, ram, cpu] -> return $ RSpec cpu ram dsk |
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_ -> Bad $ "Invalid " ++ descr ++ " specification: '" ++ inp ++ |
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"', expected disk,ram,cpu" |
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|
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-- * Command line options |
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|
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oDataFile :: OptType |
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oDataFile = Option "t" ["text-data"] |
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(ReqArg (\ f o -> Ok o { optDataFile = Just f }) "FILE") |
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"the cluster data FILE" |
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|
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oDiskMoves :: OptType |
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oDiskMoves = Option "" ["no-disk-moves"] |
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(NoArg (\ opts -> Ok opts { optDiskMoves = False})) |
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"disallow disk moves from the list of allowed instance changes,\ |
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\ thus allowing only the 'cheap' failover/migrate operations" |
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|
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oDiskTemplate :: OptType |
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oDiskTemplate = Option "" ["disk-template"] |
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(ReqArg (\ t opts -> do |
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dt <- diskTemplateFromRaw t |
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return $ opts { optDiskTemplate = Just dt }) |
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"TEMPLATE") "select the desired disk template" |
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|
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oSelInst :: OptType |
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oSelInst = Option "" ["select-instances"] |
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(ReqArg (\ f opts -> Ok opts { optSelInst = sepSplit ',' f }) "INSTS") |
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"only select given instances for any moves" |
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|
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oInstMoves :: OptType |
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oInstMoves = Option "" ["no-instance-moves"] |
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(NoArg (\ opts -> Ok opts { optInstMoves = False})) |
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"disallow instance (primary node) moves from the list of allowed,\ |
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\ instance changes, thus allowing only slower, but sometimes\ |
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\ safer, drbd secondary changes" |
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|
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oDynuFile :: OptType |
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oDynuFile = Option "U" ["dynu-file"] |
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(ReqArg (\ f opts -> Ok opts { optDynuFile = Just f }) "FILE") |
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"Import dynamic utilisation data from the given FILE" |
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|
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oEvacMode :: OptType |
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oEvacMode = Option "E" ["evac-mode"] |
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(NoArg (\opts -> Ok opts { optEvacMode = True })) |
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"enable evacuation mode, where the algorithm only moves \ |
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\ instances away from offline and drained nodes" |
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|
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oExInst :: OptType |
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oExInst = Option "" ["exclude-instances"] |
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(ReqArg (\ f opts -> Ok opts { optExInst = sepSplit ',' f }) "INSTS") |
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"exclude given instances from any moves" |
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|
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oExTags :: OptType |
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oExTags = Option "" ["exclusion-tags"] |
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(ReqArg (\ f opts -> Ok opts { optExTags = Just $ sepSplit ',' f }) |
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"TAG,...") "Enable instance exclusion based on given tag prefix" |
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|
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oExecJobs :: OptType |
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oExecJobs = Option "X" ["exec"] |
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(NoArg (\ opts -> Ok opts { optExecJobs = True})) |
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"execute the suggested moves via Luxi (only available when using\ |
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\ it for data gathering)" |
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|
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oGroup :: OptType |
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oGroup = Option "G" ["group"] |
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(ReqArg (\ f o -> Ok o { optGroup = Just f }) "ID") |
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"the ID of the group to balance" |
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|
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oLuxiSocket :: OptType |
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oLuxiSocket = Option "L" ["luxi"] |
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(OptArg ((\ f opts -> Ok opts { optLuxi = Just f }) . |
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fromMaybe defaultLuxiSocket) "SOCKET") |
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"collect data via Luxi, optionally using the given SOCKET path" |
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|
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oMachineReadable :: OptType |
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oMachineReadable = Option "" ["machine-readable"] |
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(OptArg (\ f opts -> do |
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flag <- parseYesNo True f |
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return $ opts { optMachineReadable = flag }) "CHOICE") |
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"enable machine readable output (pass either 'yes' or 'no' to\ |
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\ explicitely control the flag, or without an argument defaults to\ |
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\ yes" |
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|
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oMaxCpu :: OptType |
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oMaxCpu = Option "" ["max-cpu"] |
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(ReqArg (\ n opts -> Ok opts { optMcpu = read n }) "RATIO") |
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"maximum virtual-to-physical cpu ratio for nodes (from 1\ |
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\ upwards) [64]" |
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|
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oMaxSolLength :: OptType |
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oMaxSolLength = Option "l" ["max-length"] |
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(ReqArg (\ i opts -> Ok opts { optMaxLength = read i }) "N") |
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"cap the solution at this many balancing or allocation \ |
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\ rounds (useful for very unbalanced clusters or empty \ |
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\ clusters)" |
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|
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oMinDisk :: OptType |
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oMinDisk = Option "" ["min-disk"] |
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(ReqArg (\ n opts -> Ok opts { optMdsk = read n }) "RATIO") |
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"minimum free disk space for nodes (between 0 and 1) [0]" |
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|
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oMinGain :: OptType |
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oMinGain = Option "g" ["min-gain"] |
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(ReqArg (\ g opts -> Ok opts { optMinGain = read g }) "DELTA") |
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"minimum gain to aim for in a balancing step before giving up" |
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|
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oMinGainLim :: OptType |
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oMinGainLim = Option "" ["min-gain-limit"] |
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(ReqArg (\ g opts -> Ok opts { optMinGainLim = read g }) "SCORE") |
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"minimum cluster score for which we start checking the min-gain" |
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|
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oMinScore :: OptType |
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oMinScore = Option "e" ["min-score"] |
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(ReqArg (\ e opts -> Ok opts { optMinScore = read e }) "EPSILON") |
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"mininum score to aim for" |
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|
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oNoHeaders :: OptType |
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oNoHeaders = Option "" ["no-headers"] |
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(NoArg (\ opts -> Ok opts { optNoHeaders = True })) |
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"do not show a header line" |
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|
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oNodeSim :: OptType |
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oNodeSim = Option "" ["simulate"] |
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(ReqArg (\ f o -> Ok o { optNodeSim = f:optNodeSim o }) "SPEC") |
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"simulate an empty cluster, given as 'num_nodes,disk,ram,cpu'" |
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|
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oOfflineNode :: OptType |
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oOfflineNode = Option "O" ["offline"] |
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(ReqArg (\ n o -> Ok o { optOffline = n:optOffline o }) "NODE") |
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"set node as offline" |
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|
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oOutputDir :: OptType |
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oOutputDir = Option "d" ["output-dir"] |
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(ReqArg (\ d opts -> Ok opts { optOutPath = d }) "PATH") |
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"directory in which to write output files" |
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|
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oPrintCommands :: OptType |
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oPrintCommands = Option "C" ["print-commands"] |
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(OptArg ((\ f opts -> Ok opts { optShowCmds = Just f }) . |
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fromMaybe "-") |
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"FILE") |
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"print the ganeti command list for reaching the solution,\ |
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\ if an argument is passed then write the commands to a\ |
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\ file named as such" |
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|
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oPrintInsts :: OptType |
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oPrintInsts = Option "" ["print-instances"] |
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(NoArg (\ opts -> Ok opts { optShowInsts = True })) |
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"print the final instance map" |
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|
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oPrintNodes :: OptType |
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oPrintNodes = Option "p" ["print-nodes"] |
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(OptArg ((\ f opts -> |
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let (prefix, realf) = case f of |
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'+':rest -> (["+"], rest) |
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_ -> ([], f) |
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splitted = prefix ++ sepSplit ',' realf |
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in Ok opts { optShowNodes = Just splitted }) . |
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fromMaybe []) "FIELDS") |
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"print the final node list" |
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|
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oQuiet :: OptType |
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oQuiet = Option "q" ["quiet"] |
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(NoArg (\ opts -> Ok opts { optVerbose = optVerbose opts - 1 })) |
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"decrease the verbosity level" |
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|
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oRapiMaster :: OptType |
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oRapiMaster = Option "m" ["master"] |
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(ReqArg (\ m opts -> Ok opts { optMaster = m }) "ADDRESS") |
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"collect data via RAPI at the given ADDRESS" |
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|
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oSaveCluster :: OptType |
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oSaveCluster = Option "S" ["save"] |
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(ReqArg (\ f opts -> Ok opts { optSaveCluster = Just f }) "FILE") |
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"Save cluster state at the end of the processing to FILE" |
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|
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oShowHelp :: OptType |
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oShowHelp = Option "h" ["help"] |
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(NoArg (\ opts -> Ok opts { optShowHelp = True})) |
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"show help" |
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|
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oShowVer :: OptType |
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oShowVer = Option "V" ["version"] |
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(NoArg (\ opts -> Ok opts { optShowVer = True})) |
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"show the version of the program" |
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|
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oStdSpec :: OptType |
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oStdSpec = Option "" ["standard-alloc"] |
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(ReqArg (\ inp opts -> do |
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tspec <- parseISpecString "standard" inp |
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return $ opts { optStdSpec = Just tspec } ) |
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"STDSPEC") |
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"enable standard specs allocation, given as 'disk,ram,cpu'" |
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|
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oTieredSpec :: OptType |
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oTieredSpec = Option "" ["tiered-alloc"] |
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(ReqArg (\ inp opts -> do |
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tspec <- parseISpecString "tiered" inp |
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return $ opts { optTieredSpec = Just tspec } ) |
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"TSPEC") |
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"enable tiered specs allocation, given as 'disk,ram,cpu'" |
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|
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oReplay :: OptType |
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oReplay = Option "" ["replay"] |
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(ReqArg (\ stat opts -> Ok opts { optReplay = Just stat } ) "STATE") |
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"Pre-seed the random number generator with STATE" |
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|
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oVerbose :: OptType |
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oVerbose = Option "v" ["verbose"] |
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(NoArg (\ opts -> Ok opts { optVerbose = optVerbose opts + 1 })) |
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"increase the verbosity level" |
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|
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-- * Functions |
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|
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-- | Helper for parsing a yes\/no command line flag. |
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parseYesNo :: Bool -- ^ Default whalue (when we get a @Nothing@) |
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-> Maybe String -- ^ Parameter value |
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-> Result Bool -- ^ Resulting boolean value |
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parseYesNo v Nothing = return v |
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parseYesNo _ (Just "yes") = return True |
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parseYesNo _ (Just "no") = return False |
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parseYesNo _ (Just s) = fail $ "Invalid choice '" ++ s ++ |
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"', pass one of 'yes' or 'no'" |
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|
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-- | Usage info. |
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usageHelp :: String -> [OptType] -> String |
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usageHelp progname = |
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usageInfo (printf "%s %s\nUsage: %s [OPTION...]" |
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progname Version.version progname) |
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|
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-- | Command line parser, using the 'Options' structure. |
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parseOpts :: [String] -- ^ The command line arguments |
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-> String -- ^ The program name |
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-> [OptType] -- ^ The supported command line options |
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-> IO (Options, [String]) -- ^ The resulting options and leftover |
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-- arguments |
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parseOpts argv progname options = |
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case getOpt Permute options argv of |
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(o, n, []) -> |
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do |
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let (pr, args) = (foldM (flip id) defaultOptions o, n) |
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po <- case pr of |
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Bad msg -> do |
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hPutStrLn stderr "Error while parsing command\ |
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\line arguments:" |
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hPutStrLn stderr msg |
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exitWith $ ExitFailure 1 |
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Ok val -> return val |
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when (optShowHelp po) $ do |
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putStr $ usageHelp progname options |
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exitWith ExitSuccess |
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when (optShowVer po) $ do |
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printf "%s %s\ncompiled with %s %s\nrunning on %s %s\n" |
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progname Version.version |
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compilerName (Data.Version.showVersion compilerVersion) |
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os arch :: IO () |
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exitWith ExitSuccess |
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return (po, args) |
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(_, _, errs) -> do |
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hPutStrLn stderr $ "Command line error: " ++ concat errs |
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hPutStrLn stderr $ usageHelp progname options |
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exitWith $ ExitFailure 2 |
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|
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-- | A shell script template for autogenerated scripts. |
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shTemplate :: String |
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shTemplate = |
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printf "#!/bin/sh\n\n\ |
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\# Auto-generated script for executing cluster rebalancing\n\n\ |
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\# To stop, touch the file /tmp/stop-htools\n\n\ |
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\set -e\n\n\ |
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\check() {\n\ |
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\ if [ -f /tmp/stop-htools ]; then\n\ |
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\ echo 'Stop requested, exiting'\n\ |
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\ exit 0\n\ |
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\ fi\n\ |
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\}\n\n" |
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|
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-- | Optionally print the node list. |
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maybePrintNodes :: Maybe [String] -- ^ The field list |
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-> String -- ^ Informational message |
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-> ([String] -> String) -- ^ Function to generate the listing |
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-> IO () |
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maybePrintNodes Nothing _ _ = return () |
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maybePrintNodes (Just fields) msg fn = do |
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hPutStrLn stderr "" |
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hPutStrLn stderr (msg ++ " status:") |
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hPutStrLn stderr $ fn fields |
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|
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|
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-- | Optionally print the instance list. |
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maybePrintInsts :: Bool -- ^ Whether to print the instance list |
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-> String -- ^ Type of the instance map (e.g. initial) |
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-> String -- ^ The instance data |
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-> IO () |
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maybePrintInsts do_print msg instdata = |
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when do_print $ do |
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hPutStrLn stderr "" |
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hPutStrLn stderr $ msg ++ " instance map:" |
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hPutStr stderr instdata |
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|
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-- | Function to display warning messages from parsing the cluster |
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-- state. |
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maybeShowWarnings :: [String] -- ^ The warning messages |
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-> IO () |
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maybeShowWarnings fix_msgs = |
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unless (null fix_msgs) $ do |
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hPutStrLn stderr "Warning: cluster has inconsistent data:" |
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hPutStrLn stderr . unlines . map (printf " - %s") $ fix_msgs |
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|
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-- | Set node properties based on command line options. |
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setNodeStatus :: Options -> Node.List -> IO Node.List |
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setNodeStatus opts fixed_nl = do |
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let offline_passed = optOffline opts |
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all_nodes = Container.elems fixed_nl |
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offline_lkp = map (lookupName (map Node.name all_nodes)) offline_passed |
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offline_wrong = filter (not . goodLookupResult) offline_lkp |
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offline_names = map lrContent offline_lkp |
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offline_indices = map Node.idx $ |
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filter (\n -> Node.name n `elem` offline_names) |
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all_nodes |
516 |
m_cpu = optMcpu opts |
517 |
m_dsk = optMdsk opts |
518 |
|
519 |
unless (null offline_wrong) $ do |
520 |
hPrintf stderr "Error: Wrong node name(s) set as offline: %s\n" |
521 |
(commaJoin (map lrContent offline_wrong)) :: IO () |
522 |
exitWith $ ExitFailure 1 |
523 |
|
524 |
let nm = Container.map (\n -> if Node.idx n `elem` offline_indices |
525 |
then Node.setOffline n True |
526 |
else n) fixed_nl |
527 |
nlf = Container.map (flip Node.setMdsk m_dsk . flip Node.setMcpu m_cpu) |
528 |
nm |
529 |
return nlf |