3 running a command on multiple managed systems – HP Insight Control Software for Linux User Manual
Page 143
Deploy
→Operating System→Capture Linux Image
On the Task Results screen, the Task Instance Results always shows the user who launched the task.
This might not be the credentials used for the task execution. Because different target managed
systems can have different users specified in the SSH settings, the same task can run on different
targets as different users.
16.3 Running a command on multiple managed systems
The open source Parallel Distributed Shell (
) command is a multi-threaded remote shell client
that runs commands on multiple managed systems in parallel. You can specify all, a given number
of, or only certain managed systems on which to perform the command or commands that are
passed as arguments to the pdsh command.
The pdsh command can use three forms of managed system names.
By default, the pdsh shell can issue 32 simultaneous remote commands at a time. You can override
this default with the -f option.
The pdsh shell relies on SSH transport mechanism. Ensure that SSH is properly installed on the
system; changes to the SSH configuration can cause the pdsh shell to fail. Although the pdsh shell
can use several remote shell services, including rsh and
, the security settings for Insight Control
for Linux make ssh the shell of choice.
The syntax of the pdsh command is:
pdsh -[options] "command_to_run"
Use the pdsh --help option to view command-line options.
IMPORTANT:
Do not pass a command that requires interaction as an argument to the pdsh
command. Prompting from the remote system can cause the command to hang.
pdsh Command Examples
•
The -a option runs the uptime command on all managed systems:
# pdsh -a "uptime"
eris: 08:46:53 up 17:45, 0 users, load average: 0.05, 0.05, 0.00
mars: 19:03:14 up 17:44, 0 users, load average: 0.04, 0.04, 0.00
earth: 14:35:14 up 17:44, 0 users, load average: 0.01, 0.02, 0.00
mercury: 09:29:03 up 20:29, 2 users, load average: 0.06, 0.10, 0.09
pluto: 14:24:51 up 17:45, 0 users, load average: 0.01, 0.04, 0.00
•
The -w option enables you to specify a range of managed systems or a specific managed
system.
Description
Command line
Runs the hostname command on the first five managed systems
in the collection.
# pdsh -w icelx[1-5] hostname
earth: earth.example.com
eris: eris.example.com
IMPORTANT:
You must use the Insight Control for Linux internal
name (which is based on the Insight Control for Linux collection
name) when you specify a range of managed systems. In the
example, icelx is the Insight Control for Linux internal name.
mercury: mercury.example.com
mars: mars.example.com
pluto: pluto.example.com
Runs the uptime command on a specific managed system. In the
example, mercury is the real host name
# pdsh -w mercury uptime
For more information, see pdsh(1) and the following website:
16.3 Running a command on multiple managed systems
143