Provided by: ganeti-htools_2.9.3-1_amd64 bug

NAME

       htools - Cluster allocation and placement tools for Ganeti

SYNOPSIS

       hbal   cluster balancer

       hcheck cluster checker

       hspace cluster capacity computation

       hail   IAllocator plugin

       hscan  saves cluster state for later reuse

       hinfo  cluster information printer

       hroller
              cluster rolling maintenance scheduler

DESCRIPTION

       htools  is  a  suite  of  tools designed to help with allocation/movement of instances and
       balancing of Ganeti clusters.  htools is also the generic binary that must be symlinked or
       hardlinked   under  each  tool's  name  in  order  to  perform  the  different  functions.
       Alternatively, the environment variable HTOOLS can be used to set the desired role.

       Installed as hbal, it computes and optionally executes a suite of instance moves in  order
       to balance the cluster.

       Installed  as hcheck, it preforms cluster checks and optionally simulates rebalancing with
       all the hbal options available.

       Installed as hspace, it computes how many additional instances can be fit  on  a  cluster,
       while  maintaining  N+1 status.  It can run on models of existing clusters or of simulated
       clusters.

       Installed as hail, it acts as an IAllocator plugin, i.e.  it is used by Ganeti to  compute
       new instance allocations and instance moves.

       Installed as hscan, it scans the local or remote cluster state and saves it to files which
       can later be reused by the other roles.

       Installed as hinfo, it prints information about the current cluster state.

       Installed as hroller, it helps scheduling maintenances that  require  node  reboots  on  a
       cluster.

COMMON OPTIONS

       Options  behave  the  same  in  all  program  modes, but not all program modes support all
       options.  Some common options are:

       -p, --print-nodes
              Prints the node status, in a format designed to allow the user  to  understand  the
              node's  most  important  parameters.   If  the  command in question makes a cluster
              transition (e.g.  balancing or allocation), then usually both the initial and final
              node status is printed.

              It  is  possible  to  customise the listed information by passing a comma-separated
              list of field names to this option (the field list is currently  undocumented),  or
              to extend the default field list by prefixing the additional field list with a plus
              sign.  By default, the node list will contain the following information:

              F      a character denoting the status of the node, with  '-'  meaning  an  offline
                     node, '*' meaning N+1 failure and blank meaning a good node

              Name   the node name

              t_mem  the total node memory

              n_mem  the memory used by the node itself

              i_mem  the memory used by instances

              x_mem  amount  memory  which  seems to be in use but cannot be determined why or by
                     which instance; usually this means that the hypervisor has some overhead  or
                     that there are other reporting errors

              f_mem  the free node memory

              r_mem  the  reserved node memory, which is the amount of free memory needed for N+1
                     compliance

              t_dsk  total disk

              f_dsk  free disk

              pcpu   the number of physical cpus on the node

              vcpu   the number of virtual cpus allocated to primary instances

              pcnt   number of primary instances

              scnt   number of secondary instances

              p_fmem percent of free memory

              p_fdsk percent of free disk

              r_cpu  ratio of virtual to physical cpus

              lCpu   the dynamic CPU load (if the information is available)

              lMem   the dynamic memory load (if the information is available)

              lDsk   the dynamic disk load (if the information is available)

              lNet   the dynamic net load (if the information is available)

       -t datafile, --text-data=datafile
              Backend specification: the name of the file holding node and  instance  information
              (if  not  collecting  via RAPI or LUXI).  This or one of the other backends must be
              selected.  The option is described in the man page htools(1).

              The file should contain text data, line-based, with single empty  lines  separating
              sections.   The  lines themselves are column-based, with the pipe symbol (|) acting
              as separator.

              The first section contains group data, with the following columns:

              · group name

              · group uuid

              · allocation policy

              · tags (separated by comma)

              · networks (UUID's, separated by comma)

              The second sections contains node data, with the following columns:

              · node name

              · node total memory

              · memory used by the node

              · node free memory

              · node total disk

              · node free disk

              · node physical cores

              · offline/role field (Y for offline nodes, N for online non-master nodes, and M for
                the master node which is always online)

              · group UUID

              · node spindle count

              · node tags

              · exclusive storage value (Y if active, N otherwise)

              · node free spindles

              · virtual CPUs used by the node OS

              The third section contains instance data, with the fields:

              · instance name

              · instance memory

              · instance disk size

              · instance vcpus

              · instance status (in Ganeti's format, e.g.  running or ERROR_down)

              · instance auto_balance flag (see man page gnt-instance(8))

              · instance primary node

              · instance secondary node(s), if any

              · instance disk type (e.g.  plain or drbd)

              · instance tags

              · spindle use back-end parameter

              · actual  disk spindles used by the instance (it can be - when exclusive storage is
                not active)

              The fourth section contains the cluster tags, with one tag per line (no  columns/no
              column processing).

              The fifth section contains the ipolicies of the cluster and the node groups, in the
              following format (separated by |):

              · owner (empty if cluster, group name otherwise)

              · standard, min, max instance specs; min  and  max  instance  specs  are  separated
                between   them   by   a   semicolon,   and   can   be  specified  multiple  times
                (min;max;min;max...)  ; each of the specs contains the following values separated
                by commas:

                · memory size

                · cpu count

                · disk size

                · disk count - NIC count

              · disk templates

              · vcpu ratio

              · spindle ratio

       -m cluster
              Backend  specification: collect data directly from the cluster given as an argument
              via RAPI.  If the argument doesn't contain a colon (:), then it is converted into a
              fully-built  URL  via  prepending  https://  and  appending  the default RAPI port,
              otherwise it is considered a fully-specified URL and used as-is.

       -L [path]
              Backend specification: collect data directly from the master daemon, which is to be
              contacted  via  LUXI  (an  internal Ganeti protocol).  An optional path argument is
              interpreted as the path to the unix socket on  which  the  master  daemon  listens;
              otherwise, the default path used by Ganeti (configured at build time) is used.

       -I|--ialloc-src path
              Backend  specification:  load data directly from an iallocator request (as produced
              by Ganeti when doing an iallocator call).  The  iallocator  request  is  read  from
              specified path.

       --simulate description
              Backend specification: instead of using actual data, build an empty cluster given a
              node description.  The description parameter must be a comma-separated list of five
              elements, describing in order:

              · the  allocation  policy for this node group (preferred, allocable or unallocable,
                or alternatively the short forms p, a or u)

              · the number of nodes in the cluster

              · the disk size of the nodes (default in mebibytes, units can be used)

              · the memory size of the nodes (default in mebibytes, units can be used)

              · the cpu core count for the nodes

              · the spindle count for the nodes

              An example description would  be  preferred,20,100G,16g,4,2  describing  a  20-node
              cluster where each node has 100GB of disk space, 16GiB of memory, 4 CPU cores and 2
              disk spindles.  Note that all nodes must have the same specs currently.

              This option can be given multiple times, and each new use defines a new node group.
              Hence  different  node  groups  can  have  different  allocation  policies and node
              count/specifications.

       -v, --verbose
              Increase the output verbosity.   Each  usage  of  this  option  will  increase  the
              verbosity (currently more than 2 doesn't make sense) from the default of one.

       -q, --quiet
              Decrease  the  output  verbosity.   Each  usage  of  this  option will decrease the
              verbosity (less than zero doesn't make sense) from the default of one.

       -V, --version
              Just show the program version and exit.

   UNITS
       Some options accept not simply numerical values, but  numerical  values  together  with  a
       unit.   By  default,  such  unit-accepting  options  use  mebibytes.  Using the lower-case
       letters of m, g and t (or their longer equivalents  of  mib,  gib,  tib,  for  which  case
       doesn't  matter)  explicit  binary  units  can be selected.  Units in the SI system can be
       selected using the upper-case letters of M, G and T (or their longer  equivalents  of  MB,
       GB, TB, for which case doesn't matter).

       More  details  about  the  difference between the SI and binary systems can be read in the
       units(7) man page.

ENVIRONMENT

       The environment variable HTOOLS can be used instead of renaming/symlinking  the  programs;
       simply set it to the desired role and then the name of the program is no longer used.

REPORTING BUGS

       Report   bugs   to  project  website  (http://code.google.com/p/ganeti/)  or  contact  the
       developers using the Ganeti mailing list (ganeti@googlegroups.com).

SEE ALSO

       Ganeti overview and specifications: ganeti(7) (general  overview),  ganeti-os-interface(7)
       (guest OS definitions), ganeti-extstorage-interface(7) (external storage providers).

       Ganeti   commands:   gnt-cluster(8)   (cluster-wide   commands),  gnt-job(8)  (job-related
       commands), gnt-node(8) (node-related commands), gnt-instance(8) (instance commands),  gnt-
       os(8)  (guest  OS  commands),  gnt-storage(8) (storage commands), gnt-group(8) (node group
       commands), gnt-backup(8) (instance import/export commands), gnt-debug(8) (debug commands).

       Ganeti daemons: ganeti-watcher(8) (automatic instance restarter),  ganeti-cleaner(8)  (job
       queue  cleaner), ganeti-noded(8) (node daemon), ganeti-masterd(8) (master daemon), ganeti-
       rapi(8) (remote API daemon).

       Ganeti htools: htools(1) (generic binary), hbal(1) (cluster balancer), hspace(1) (capacity
       calculation),  hail(1) (IAllocator plugin), hscan(1) (data gatherer from remote clusters),
       hinfo(1) (cluster information printer), mon-collector(7) (data collectors interface).

COPYRIGHT

       Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011, 2012 Google Inc.  Permission is  granted
       to  copy,  distribute  and/or  modify under the terms of the GNU General Public License as
       published by the Free Software Foundation; either version 2 of the License,  or  (at  your
       option) any later version.

       On  Debian  systems,  the  complete text of the GNU General Public License can be found in
       /usr/share/common-licenses/GPL.