IBM InfoSphere Streams Version 4.1.1

streamtool checkhosts

The streamtool checkhosts command verifies that you meet configuration and network connectivity requirements on one or more InfoSphere® Streams hosts.

Usage


checkhosts

>>-+----------------------+--+---------------------+------------>
   '- --connectivity-only-'  '- --fmt--format-spec-'   

>--+-------------+--+--------------------+---------------------->
   '-+- -h-----+-'  +- --hfile--pathname-+   
     '- --help-'    |           .-,----. |   
                    |           V      | |   
                    '- --hosts----host-+-'   

>--+---------------------+--+-----------------------+----------->
   '- --trace--+-------+-'  '-+- -v--------+--level-'   
               '-level-'      '- --verbose-'            

>--+-----------+-----------------------------------------------><
   '---xclient-'

Authority

You do not need any authority to run this command.

Description

This command can check the hosts before they are allocated to domains or instances. The hosts must be configured to use Secure Shell (SSH). The command uses SSH to access each host and run the tests.

This command checks all the hosts that you specify in the --hosts or --hfile options.

The host where you run the streamtool checkhost is used as the client host. By default, the client host is the reference that InfoSphere Streams uses to verity the configuration of the resources. To change the client host, specify the --xclient option.

You can perform the following checks with this command:

Connectivity-only check

InfoSphere Streams checks the network configuration of a single resource or connectivity between resources.

Environment checks

InfoSphere Streams performs the following checks:

SSH check: This check verifies that SSH connectivity is set up correctly for InfoSphere Streams.
Dependency check: This check verifies the RPM levels of all packages that are required by InfoSphere Streams.
Compatible operating system check: This check verifies that the resources have compatible operating systems.
Ulimit check: This check verifies that the ulimit settings on the resources are adequate to run InfoSphere Streams.
Compatible architecture check: This check verifies that the resources have compatible architectures.

Options and arguments

--connectivity-only

Specifies to run only the connectivity checks.

--fmt format-spec

Specifies the presentation format. The command supports the following values:
%Mf: Multiline record format. One line per field.

%Nf: Name prefixed field table format. One line per processing element.

%Tf: Standard table format, which is the default. One line per host check result.

-h,--help

Specifies to show the command syntax.

--hfile host-file

Specifies the path to a file, which can contain host identifiers.
A host identifier can be a host name or IP address. The host name can be a simple or fully qualified domain name. Each host identifier must be on a separate line in the file. The host specification syntax is:
hostname
The file can also contain comment lines (blank lines or lines where the first non-whitespace character is a '#').

--hosts host

Specifies one or more host identifiers. A host identifier can be a host name or IP address. Each host identifier must be separated by a comma. For the command to run successfully on each host, SSH must be set up on the hosts.

--trace level

Specifies the trace setting. The following valid levels are listed in order of increasing verbosity, which is to say that the first level in the list generates the least amount of information:
off

error

warn

info

debug

trace

The default value is off.

-v,--verbose level

Specifies to provide more detailed command output. The vebosity level can be from 0 to 3 where each increment provides more detailed output.

--xclient

Specifies to use the first resource in the list of resources as the reference for operating system and architecture checks. If you do not specify this option, the resource where you run the command is used for the comparison checks.

--zkconnect host:port

The name of one or more host and port pairs that specify the configured ZooKeeper servers. This option is not supported within the interactive streamtool interface.

If you are not using the interactive streamtool interface and you do not specify this option, InfoSphere Streams tries to use:
The --embeddedzk option

The value from the STREAMS_ZKCONNECT environment variable

A ZooKeeper connection string that is derived from cached information about the current domain.

Examples

[streamtool <bsmith@StreamsDomain.StreamsInstance]
checkhosts --hosts host3,host4
Date: Fri Oct 31 14:47:54 EDT 2014
2 resources to check: [host3.ibm.com, host4.ibm.com]
Reference resource: host6.ibm.com
=============================================================
Resource checks
=============================================================
  Resource Name Summary  Connectivity Check Environment Check
  host3.ibm.com PASSED   PASSED             PASSED
  host4.ibm.com PASSED   PASSED             PASSED
=============================================================
2 OK resources
0 problem resources
=============================================================
Overall Summary
=============================================================
2 resources checked
2 OK resources
0 problem resources