Ubuntu Manpage: hscan - Scan clusters via RAPI and save node/instance data

Provided by: ganeti-htools-2.15_2.15.2-3_amd64

NAME

       hscan - Scan clusters via RAPI and save node/instance data

SYNOPSIS

       hscan [-p] [--no-headers] [-d path ] cluster...

       hscan --version

DESCRIPTION

hscan is a tool for scanning clusters via RAPI and saving their data in the input format used by hbal(1)
and hspace(1). It will also show a one-line score for each cluster scanned or, if desired, the cluster
state as show by the -p option to the other tools.

For each cluster, one file named cluster.data will be generated holding the node and instance data. This
file can then be used in hbal(1) or hspace(1) via the -t option. In case the cluster name contains
slashes (as it can happen when the cluster is a fully-specified URL), these will be replaced with under‐
scores.

The one-line output for each cluster will show the following:

Name The name of the cluster (or the IP address that was given, etc.)

Nodes The number of nodes in the cluster

Inst The number of instances in the cluster

BNode The number of nodes failing N+1

BInst The number of instances living on N+1-failed nodes

t_mem Total memory in the cluster

f_mem Free memory in the cluster

t_disk Total disk in the cluster

f_disk Free disk space in the cluster

Score The score of the cluster, as would be reported by hbal(1) if run on the generated data files.

In case of errors while collecting data, all fields after the name of the cluster are replaced with the
error display.

Note: this output format is not yet final so it should not be used for scripting yet.

OPTIONS

       The options that can be passed to the program are as follows:

       -p, --print-nodes
              Prints the node status for each cluster after the cluster's one-line status display, in  a  format
              designed  to  allow the user to understand the node's most important parameters.  For details, see
              the man page for htools(1).

       -d path
              Save the node and instance data for each cluster under path, instead of the current directory.

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

EXIT STATUS

       The exist status of the command will be zero, unless for some reason loading the input data failed fatal‐
       ly (e.g.  wrong node or instance data).

BUGS

       The program does not check its input data for consistency, and aborts with  cryptic  errors  messages  in
       this case.

EXAMPLE

              $ hscan cluster1
              Name     Nodes  Inst BNode BInst  t_mem  f_mem t_disk f_disk      Score
              cluster1     2     2     0     0   1008    652    255    253 0.24404762
              $ ls -l cluster1.data
              -rw-r--r-- 1 root root 364 2009-03-23 07:26 cluster1.data

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).

       Ganeti overview and specifications: ganeti(7) (general overview), ganeti-os-interface(7) (guest OS defin‐
       itions), 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-stor‐
       age(8) (storage commands), gnt-group(8) (node group commands), gnt-backup(8) (instance import/export com‐
       mands), 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-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

Redistribution and use in source and binary forms, with or without modification, are permitted provided
that the following conditions are met:

1. Redistributions of source code must retain the above copyright notice, this list of conditions and
the following disclaimer.

2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and
the following disclaimer in the documentation and/or other materials provided with the distribution.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED
WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMIT‐
ED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUP‐
TION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (IN‐
CLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
THE POSSIBILITY OF SUCH DAMAGE.

Ganeti HSCAN(1)